Dr. John A. Knaff
Dr. John A. Knaff
Tropical/Satellite Meteorologist
Office: CIRA Room 112, Fort Collins
Phone: 970-491-8881
Fax: 970-491-8241
Email:
Mailing Address:
John Knaff
NESDIS/STAR - RAMMB
CIRA/Colorado State University
Campus Delivery 1375
Fort Collins, CO 80523-1375
Biography

John Knaff earned a B.S. in Meteorology (1989) from Texas A&M University, and a MS (1992) and PhD (1997) in Atmospheric Science from Colorado State University. He was briefly as post-doctoral researcher in the Department of Atmospheric Science at Colorado State University (1997). Following that appointment, he was a post-doctoral fellow at the Cooperative Institute for Research in the Atmosphere at Colorado State University (1997-1999) where he was also employed as a Research Scientist position (1999-2006). He joined NOAA in 2006 as a Meteorologist in the NESDIS Regional and Mesoscale Meteorology Branch located in Fort Collins, Colorado.

During his time as a student he studied and published on topics related to tropical climate variability including El Nino/Southern Oscillation, monsoons, tropical cyclones and large-scale Atlantic climatology. The focus of his more recent studies, including his postdoctoral work, has been on observational aspects of hurricane structure and intensity variations and prediction. Most recently has concentrated on forecast applications and the operational transition of these products to both the National Hurricane Center and the Joint Typhoon Warning Center. In 2004, he received the NOAA David Johnson Award for basic research for improving the understanding of tropical phenomenon and predicting tropical cyclone intensity, accompanied by exemplary transfer of the results into operational products.

Current research includes the utilization of satellite and other observations to improve scientific understanding, diagnosis and forecasting capabilities of tropical cyclone genesis and structure change, the development and documentation of operational tropical cyclone forecasting techniques, and the transfer of such techniques to the operational setting.
Since 1991, he has published more than 25 articles on tropical cyclones, mesoscale meteorology and tropical climatology in the refereed literature.

Selected Publications
  • Zhang, M., Kim, M. -J., Knaff, J., Zupanski, M., 2012: All-sky satellite radiance assimilation using NOAA operational HWRF and a regional hybrid ensemble-variational data assimilation system, 2012 Warn-On-Forecast and High Impact Weather Workshop.February 8-9, 2012, Norman, OK
  • DeMaria, M., DeMaria, R. T., Dostalek, J. F., Knaff, J., Schumacher, A. B., 2012: Applications of ATMS/CrIS soundings to tropical cyclone analysis and forecasting, AMS 8th Annual Symposium on Future Operational Environmental Satellite Systems.January 22-26, 2012, New Orleans, LA
  • Molthan, A, Fuell, K., Knaff, J., Oswald, H, 2012: Development of RGB composite imagery for operational weather forecasting applications, AMS 8th Annual Symposium on Future Operational Environmental Satellite Systems.January 22-26, 2012, New Orleans, LA
  • Knaff, J., Brummer, R. L., DeMaria, M., Franklin, J., Landsea, C. W., 2012: Development of a real-time automated tropical cyclone surface wind analysis: A year 1 Joint Hurricane Testbed project update, 66th Interdepartmental Hurricane Conference.March 5-8, 2012, Charleston, SC
  • Zhang, M., Kim, M. -J., Knaff, J., Zupanski, M., 2012: Direct assimilation of all-sky AMSU-A radiances in TC inner core: Hurricane Danielle (2010), (in prep) Mon. Wea. Rev., vol. ,
  • DeMaria, M., Brennan, M. J. , Brummer, R. L., Knaff, J., Landsea, C. W., Schumacher, A. B., 2012: Improvements in statistical tropical cyclone forecast models: A year 1 Joint Hurricane Testbed project update, 66th Interdepartmental Hurricane Conference.March 5-8, 2012, Charleston, SC
  • Schumacher, A. B., DeMaria, M., Knaff, J., 2011: , Tropical Cyclone Mini Workshop.16 Nov 2011, Fort Collins, CO
  • Sampson, C. R., DeMaria, M., Kaplan, J., Knaff, J., Sisko, C., 2011: A deterministic rapid internsification aid, Weather Forecasting, vol. 26, 579-585
  • Knaff, J., DeMaria, M., Molenar, D. A., Sampson, C. R., Seybold, M.G., 2011: An automated, objective, multi-satellite platform tropical cyclone surface wind analysis, Journal of Applied Meteorology and Climatology, vol. 50, 2149-2166
  • Schumacher, A. B., DeMaria, M., Knaff, J., 2011: Another look at maximum potential intensity estimates for tropical cyclones, NOAA/NESDIS CoRP Science Symposium.17-18 Aug, 2011, Asheville, NC
  • Zhang, M., Kim, M. -J., Knaff, J., Zupanski, M., 2011: Assimilating cloudy radiance with MLEF using NCEP Operational HWRF system, 12th Annual WRF user.June 23, 2011, Boulder, Co.
  • Apodaca, K, Grasso, L. D., Knaff, J., Zupanski, M., 2011: Assimilation of MSG-SEVIRI cloudy radiances into MLEF-HWRF as a GOES-R ABI Proxy, JCSDA 9th Workshop on Satellite Data Assimilation.May 24-25, 2011, College Park, Maryland
  • Rozoff, C. M., DeMaria, M., Kaplan, J., Kieper, M. E., Knaff, J., Kossin, J. P., Velden, C. S., Wimmers, A. J., 2011: Improvements in the statistical prediction of tropical cyclone rapid intensification, 65th Interdepartmental Hurricane Conference.28 Feb-3 Mar 2011, Miami, FL
  • Knaff, J., DeMaria, M., Kaplan, J., Kossin, J. P., Rozoff, C. M., Velden, C. S., 2011: Improvements to statistical intensity forecasts, 65th Interdepartmental Hurricane Conference.February 28-March 3, 2011, Miami, FL
  • Schubert, W., Cummings, J., DeMaria, M., Knaff, J., McNoldy, B. D., Musgrave, K., Sampson, B., 2011: Improving tropical cyclone intensity forecasting with theoretically-based statistical models,, NOPP Review.February 25, 2011, Miami, FL
  • Knaff, J., 2011: New tropical cyclone intensity forecast tools for the western North Pacific., Joint Typhoon Warning Center Seminar.Sept 13, 2011,
  • Knaff, J., 2011: New tropical cyclone intensity forecast tools for the western North Pacific., Off-CONUS Proving Ground workshop.July 27-29, 2011, Juneau, AK
  • Knaff, J., 2011: New tropical cyclone intensity forecast tools for the western north Pacific, Joint Typhoon Warning Center.September 13, 2011,
  • Knaff, J., 2011: Overview of CIRA and NESDIS global TC services, WMO Southern Hemisphere TC Workshop (via remote webinar).September 14, 2011, Melbourne, Australia
  • Connell, B. H., Bikos, D. E., Braun, J. J., Brummer, R. L., DeMaria, M., Hillger, D. W., Kidder, S. Q., Knaff, J., Lindsey, D. T., Micke, K., Miller, S. D., 2011: Satellite training activities: VISIT, SHyMet, and WMO VLab focus group, Satellite Direct Readout Conference.Miami, FL, April 408, 2011
  • Knaff, J., Fitzpatrick, P, Hill, C, Jin, Y., Sampson, B., 2011: Simple diagnosis of tropical cyclone structure via pressure gradients, Weather & Forecasting, vol. 26, 1020-1031
  • DeMaria, M., Knaff, J., 2011: TC rapid intensity forecasting, GOES-R Risk Reduction Annual Review.Sep 2011,
  • DeMaria, M., Beven, J., Brennan, M. J. , DeMaria, R. T., Demetriades, N., Kaplan, J., Knaff, J., Schumacher, A. B., 2011: Tropical cyclone rapid intensity change forecasting using lightning data during the 2010 GOES-R proving ground at the National Hurricane Center, AMS 5th Conference on the Meteorological Applications of Lightning Data.January 23-27, 2011, Seattle, WA
  • Hillger, D. W., Bachmeier, A. S., Gunshor, M. M., Knaff, J., Lindsey, D. T., Schmit, T. J., 2011: science test results from the GOES-14 and -15 imager and sounder (poster), AMS 7th Annual Symposium on Future Operational Environmental Satellite Systems.January 23-27, 2011, Seattle, WA
  • Kaplan, J., DeMaria, M., Knaff, J., 2010: A revised tropical cyclone rapid intensification index for the Atlantic and Eastern North Pacific basins, Weather and Forecasting, vol. 25, 220-241
  • Knaff, J., Beven, J., Brown, Daniel P., Courtney, J., Gallina, G. M., 2010: An evaluation of Dvorak technique-based tropical cyclone intensity estimates, Weather Forecasting, vol. 25, 1362-1370
  • Velden, C. S., Hawkins, J. D., Kieper, M. E., Knaff, J., Kossin, J. P., Rozoff, C. M., Sitkowski, M., Wimmers, A. J., 2010: An objective method to predict near real time rapid intensification of tropical cyclones using satellite passive microwave observations, 29th AMS Conference on Hurricanes and Tropical Meteorology.May 8-12, 2010, Tucson, AZ
  • DeMaria, M., DeMaria, R. T., Demetriades, N., Kaplan, J., Knaff, J., 2010: Application of lightning measurements to tropical cyclone rapid intensity change forecasting, 17th AMS Conference on Satellite Meteorology and Oceanography.September 27-October 1, 2010, Annapolis, MD
  • Knaff, J., DeMaria, M., DeMaria, R. T., Dunion, J. P., Kaplan, J., 2010: Assessing the impact of total precipitable water and lightning on SHIPS forecasts, 29th AMS Conference on Hurricanes and Tropical Meteorology.May 8-12, 2010, Tucson, AZ
  • Kaplan, J., Cione, J. J., DeMaria, M., Dostalek, J. F., Dunion, J. P., Hawkins, J. D., Kalina, E. , Knaff, J., Lee, T. E., Leighton, P., Solbrig, J. E. , Zhang, J., 2010: Enhancements to the operational SHIPS rapid intensification index, 29th AMS Conference on Hurriucanes and Tropical Meteorology.May 8-12, 2010, Tucson, AZ
  • Knaff, J., 2010: Overview of tropical cyclone research and development at CIRA/RAMMB, CORP Science Symposium., August 10-11, 2010
  • Knaff, J., DeMaria, M., 2010: Rapid Weakening of Non-Landfalling Atlantic Tropical Cyclones, 64th Interdepartmental Hurricane Conference.March 1-4, 2010, Savannah, GA
  • Goni, G. J., Knaff, J., Lin, I-I, 2010: TC heat potential (TCHP), Bull. Amer. Meteor. Soc., vol. 91, S99-S100
  • Schumacher, A. B., Brown, Daniel P., DeMaria, M., Knaff, J., 2010: The NESDIS tropical cyclone formation probability product: An overview of past performance and future plans, 64th Interdepartmental Hurricane Conference.March 1-4, 2010, Savannah, GA
  • Knaff, J., Harper, B.A., 2010: Tropical cyclone surface wind structure and wind-pressure relationships, WMO International Workshop on Tropical Cyclones VII.November 15-20, 2010, La Reunion, France
  • DeMaria, M., DeMaria, R. T., Knabb, R., Knaff, J., Lauer, C., Sampson, C. R., 2009: A new method for estimating tropical cyclone wind speed probabilities, Weather and Forecasting, vol. 24, 1573-1591
  • Knaff, J., Brown, Daniel P., Courtney, J., Gallina, G. M., 2009: An evaluation of biases and errors associated with the subjective Dvorak Technique 1989-2007, International Best Track and Climate Stewardship (IBTrACS) Workshop.May 5-7, 2009, Ashville, NC
  • DeMaria, M., Kidder, S. Q., Knaff, J., Lauer, C., Sampson, C. R., Sisko, C., 2009: An improved wind probability program: A year 2 joint hurricane testbed project update, 63rd Interdepartmental Hurricane Conference.March 2-5, 2009, St. Petersburg, FL
  • Knaff, J., DeMaria, M., Gurka, J., Hillger, D. W., 2009: Developing GOES-R tropical cyclone products vis proxies, 63rd Interdepartmental Hurricane Conference.March 2-5, 2009, St. Petersburg, FL
  • DeMaria, M., Brown, Daniel P., Gallina, G. M., Kaplan, J., Knaff, J., Kossin, J. P., Schumacher, A. B., 2009: Improved GOES utilization for tropical cyclone forecasting, 63rd Interdepartmental Hurricane Conference.March 2-5, 2009, St. Petersburg, FL
  • Schumacher, A. B., DeMaria, M., Knaff, J., 2009: Objective estimation of the 24-h probability of tropical cyclone formation, Weather and Forecasting, vol. 24, 456-471
  • Knaff, J., 2009: Propagating patterns in 6.7 µm imagery in re-intensifying tropical-to-extratropical cyclone transitions, 16th AMS Conference on Satellite Meteorology and Oceanography.January 11-15, 2009, Phoenix, AZ
  • Knaff, J., 2009: Revisiting the maximum intensity of recurving tropical cyclones, International Journal of Climatology, vol. 29, 827-837
  • Knaff, J., Sampson, C. R., 2009: Southern hemisphere tropical cyclone intensity forecast methods used at the Joint Typhoon Warning Center, Part I: control forecasts based on climatology and persistence, Australian Meteorological and Oceanographic Journal, vol. 58, 1-7
  • Knaff, J., Sampson, C. R., 2009: Southern hemisphere tropical cyclone intensity forecast methods used at the Joint Typhoon Warning Center, Part II: statistical-dynamical forecasts, Australian Meteorological and Oceanographic Journal , vol. 58, 9-18
  • Sampson, C. R., Knaff, J., 2009: Southern hemisphere tropical cyclone intensity forecast methods used at the Joint Typhoon Warning Center, Part III: forecasts based on a multi-model consensus approach, Australian Meteorological and Oceanographic Journal , vol. 58, 19-27
  • Knaff, J., 2009: Understanding and (possibly) rectifying historical and regional wind-pressure relationship differences, International Best Track and Climate Stewardship (IBTrACS) Workshop .May 5-7, 2009, Ashville, NC
  • DeMaria, M., Harr, P., Kidder, S. Q., Knaff, J., Lauer, C., 2008: An improved wind probability program, 62nd Interdepartmental Hurricane Conference.March 3-7, 2008, Charleston, SC
  • Sampson, C. R., DeMaria, M., Franklin, J., Knaff, J., 2008: Experiments with a simple tropical cyclone intensity consensus, Weather and Forecasting, vol. 23, 304-312
  • Brummer, R. L., Connell, B. H., DeMaria, M., Dostalek, J. F., Knaff, J., Zupanski, D., 2008: GOES-R mesoscale product development, 5th AMS GOES Users Conference.January 21-25, 2008, New Orleans, LA
  • Knaff, J., DeMaria, M., Krautkramer, A., Schumacher, A. B., 2008: New and updated operational tropical cyclone wind products, 62nd Interdepartmental Hurricane Conference.March 3-7, 2008, Charleston, SC
  • Knaff, J., Cram, T.A., DeMaria, M., Kossin, J. P., Schumacher, A. B., 2008: Objective identification of annular hurricanes, Weather and Forecasting, vol. 23, 17-28
  • Knaff, J., Zehr, R. M., 2008: Reply, Weather and Forecasting , vol. 23, 762-770
  • Schumacher, A. B., Brown, Daniel P., DeMaria, M., Knaff, J., 2008: The NESDIS tropical cyclone formation probability product: An overview of past performance and future plans, 62nd Interdepartmental Hurricane Conference.March 3-7, 2008, Charleston, SC
  • Schumacher, A. B., DeMaria, M., Irving, A., Knaff, J., Merckle, N., 2007: A new tropical cyclone formation product: operational implementation for the Atlantic and Eastern Pacific in 2006 and extension to the Western N. Pacific in 2007, 61st Interdepartmental Hurricane Conference.March 5-9, 2007, New Orleans, Louisiana
  • DeMaria, M., Harr, P., Kidder, S. Q., Knaff, J., Lauer, C., 2007: An improved wind probability program: A joint hurricane testbed project update, 62nd Interdepartmental Hurricane Conference.March 3-7, 2007, Charleston, South Carolina
  • Knaff, J., 2007: CIRA/RAMMB tropical cyclone forecast tools: Planned operational transitions and new initiatives, National Hurricane Center.November 1, 2007, Miami, FL
  • Kossin, J. P., Berger, H.I., Cram, T.A., Hawkins, J. D., Herndon, D., Knaff, J., Murnane, R.J., Velden, C. S., 2007: Estimating hurricane wind structure in the absence of aircraft reconnaissance, Weather and Forecasting, vol. 22, 89-101
  • DeMaria, M., Knaff, J., Sampson, C. R., 2007: Evaluation of long-term trends in tropical cyclone intensity forecasts, Meteorology and Atmospheric Physics, vol. 97, 19-28
  • DeMaria, M., Kaplan, J., Knaff, J., 2007: Improved statistical intensity forecast models: a joint hurricane testbed project year 2 progress report, 61st Interdepartmental Hurricane Conference.March 5-9, 2007, New Orleans, Louisiana
  • Knaff, J., DeMaria, M., Goni, G. J., Krautkramer, A., Sampson, B., 2007: Introducing the CIRA/NESDIS - regional and mesoscale meteorology branch tropical cyclone web page, 61st Interdepartmental Hurricane Conference.March 5-9, 2007, New Orleans, Louisiana
  • Sampson, C. R., Fukada, E. M. , Knaff, J., 2007: Operational evaluation of a selective consensus in the Western North Pacific Basin, Weather and Forecasting, vol. 22, 671-675
  • Schumacher, A. B., Cram, T.A., DeMaria, M., Knaff, J., Kossin, J. P., 2007: Operational implementation of an objective annular hurricane index, 61st Interdepartmental Hurricane Conference.March 5-9, 2007, New Orleans, Louisiana
  • Knaff, J., Zehr, R. M., 2007: Reexamination of tropical cyclone pressure wind relationships, Weather and Forecasting, vol. 22, 71-88
  • Knaff, J., DeMaria, M., Gross, J. M., Marchok, T.P., McAdie, C.J., Sampson, C. R., 2007: Statistical tropical cyclone wind radii prediction using climatology and persistence, Weather and Forecasting, vol. 22, 781-791
  • Knaff, J., DeMaria, M., Lauer, C., 2007: Verification of the Monte Carlo tropical cyclone wind speed probabilities: a joint hurricane testbed project update, 61st Interdepartmental Hurricane Conference.March 5-9, 2007, New Orleans, Louisiana
  • Knaff, J., DeMaria, M., 2006: A multi-platform satellite tropical cyclone wind analysis system, AMS 14th Conference on Satellite Meteorology and Oceanography .January 29-February 3, 2006, Altanta, GA
  • Hillger, D. W., Daniels, J. M., Knaff, J., Lindsey, D. T., Schmit, T. J., 2006: An overview of the GOES-N science test, 6-p, AMS 14th Conference on Satellite Meteorology and Oceanography .January 29-February 3, 2006, Atlanta, Georgia
  • Landsea, C. W., Harper, B.A., Hoarau, K., Knaff, J., 2006: Can we detect trends in extreme tropical cyclones?, Science, vol. 313, 452-454
  • Knaff, J., DeMaria, M., 2006: Continued development of tropical cyclone wind probability products: A joint hurricane testbed project update, 60th Interdepartmental Hurricane Conference.March 26, 2006, Mobile, AL
  • Chen, S.S., Knaff, J., Marks, F. D., 2006: Effects of vertical wind shear and storm motion tropical cyclone rainfall asymmetries deduced from TRMM, Monthly Weather Review, vol. 134, 3190-3208
  • Lindsey, D. T., Dostalek, J. F., Grasso, L. D., Hillger, D. W., Knaff, J., 2006: GOES climatology and analysis of thunderstorms with enhanced 3.9-µm reflectivity, Monthly Weather Review, vol. 134, 2342-2353
  • DeMaria, M., Kaplan, J., Knaff, J., 2006: Improved statistical intensity forecast models: A joint hurricane testbed project update, 60th Interdepartmental Hurricane Conference.March 26, 2006, Mobile, Alabama
  • Demuth, J. L., DeMaria, M., Knaff, J., 2006: Improvement of advanced microwave sounding unit tropical cyclone intensity and size estimation algorithms, Journal of Applied Meteorology and Climatology , vol. 45, 1573-1581
  • Mueller, K. J., DeMaria, M., Knaff, J., Kossin, J. P., Vonder Haar, T. H., 2006: Objective estimation of tropical cyclone wind structure form infrared satellite data, Weather and Forecasting, vol. 21, 990-1005
  • Cram, J. M., DeMaria, M., Knaff, J., 2006: Objective identification of annular hurricanes using GOES and reanalysis data, AMS 27th Conference on Hurricanes and Tropical Meteorology.April 24-28, 2006, Monterey, CA
  • DeMaria, M., Kaplan, J., Knaff, J., 2006: On the decay of tropical cyclone winds crossing narrow landmasses, Journal of Applied Meteorology and Climatology, vol. 45, 491-499
  • Knaff, J., Sampson, C. R., 2006: Reanalysis of West Pacific tropical cyclone intensity 1966-1987, AMS 27th Conference on Hurricanes and Tropical Meteorology.April 24-28, 2006, Monterey, CA
  • DeMaria, M., Knaff, J., Maclay, K. S., 2006: Tropical cyclone structure analysis: a multi-sensor approach, AGU Fall Meeting.December 11-15, 2006, San Francisco, California
  • Bessho, K., DeMaria, M., Knaff, J., 2006: Tropical cyclone wind retrievals from the advanced microwave sounding unit (AMSU): Application to surface wind analysis, Journal of Applied Meteorology and Climatology, vol. 45, 399-415
  • Knaff, J., DeMaria, M., Sampson, C. R., 2005: An operational statistical typhoon intensity prediction scheme for the Western North Pacific, Weather and Forecasting, vol. 20, 688-699
  • DeMaria, M., Demuth, J. L., Dostalek, J. F., Knaff, J., Zehr, R. M., 2005: CIRA contributions to the joint hurrican testbed, CIRA Magazine, vol. 23, 5-7
  • Knaff, J., Sampson, C. R., 2005: Development of STIPS for the Southern Hemisphere and Indian Ocean, 59th Interdepartmental Hurricane Conference.March 7-11, 2005, Jacksonville, FL
  • Knaff, J., DeMaria, M., Mueller, K. J., Zehr, R. M., 2005: Development of a multiplatform satellite tropical cyclone wind analysis system, 59th Interdepartmental Hurricane Conference.March 7-11, 2005, Jacksonville, FL
  • Knaff, J., 2005: Exploiting infrared satellite data to estimate tropical cyclone wind radii, The RPI Research Update Workshop.September 2005, St. George, Bermuda
  • DeMaria, M., Kaplan, J., Knaff, J., Mainelli, M., Shay, L. K., 2005: Further improvements to the Statistical Hurricane Intensity Prediction Scheme (SHIPS), Weather and Forecasting, vol. 20, 531-543
  • DeMaria, M., Knaff, J., Mueller, K. J., Zehr, R. M., 2005: Improvements in deterministic and probabilistic tropical cyclone wind predictions: A joint hurricane testbed project update, 59th Interdepartmental Hurricane Conference.March 7-11, 2005, Jacksonville, FL
  • Zehr, R. M., DeMaria, M., Knaff, J., Mueller, K. J., 2005: NOAA's next-generation polar and geostationary satelllites hurricane applications, 59th Interdepartmental Hurricane Conference.March 7-11, 2005, Jacksonville, Florida
  • Mueller, K. J., DeMaria, M., Knaff, J., Zehr, R. M., 2005: Objective estimation of tropical cyclone wind structure from infrared satellite data, 59th Interdepartmental Hurricane Conference.March 7-11, 2005, Jacksonville, FL
  • Knaff, J., 2005: Potential for improving tropical cyclone wind speed probabilities, Department of Defense Tropical Cyclone Workshop.February 14, 2005, Honolulu, HI
  • Kidder, S. Q., Ferraro, R. R., Knaff, J., Kuligowski, R. J., Kusselson, S. J., Turk, M, 2005: The tropical rainfall potential (TRaP) technique. Part 1: Description and examples, Weather and Forecasting, vol. 20, 456-464
  • Ferraro, R. R., Chen, W. C., Irving, A., Kidder, S. Q., Knaff, J., Kuligowski, R. J., Kusselson, S. J., Pellegrino, P., Qiu, S. H., Turk, M., 2005: The tropical rainfall potential (TRaP) technique. Part II: Validation, Weather and Forecasting, vol. 20, 465-475
  • Gross, J. M., DeMaria, M., Knaff, J., Sampson, C. R., 2004: A new method for determining tropical cyclone wind forecast probabilities, AMS 26th Conference on Hurricanes and Tropical Meteorology.May 3-7, 2004, Miami, FL
  • DeMaria, M., Anderson, C. W., Connell, B. H., Knaff, J., 2004: A new product for estimating the probability of tropical cyclone formation, AMS 26th Conference on Hurricanes and Tropical Meteorology.May 3-7, 2004, Miami, FL
  • DeMaria, M., Bikos, D. E., Gosden, H., Hillger, D. W., Knaff, J., Lindsey, D. T., Purdom, J. F. W., Watson, D. L., Zehr, R. M., 2004: Advance mesoscale product development for GOES-R using operational and experimental satellite observations, 3rd GOES Users Conference.May 10-13, 2004, Broomfield, CO
  • Knaff, J., DeMaria, M., Sampson, C. R., 2004: An introduction to the statistical typhoon intensity prediction scheme (STIPS), AMS 26th Conference on Hurricanes and Tropical Meteorology.May 3-7, 2004, Miami, FL
  • Demuth, J. L., DeMaria, M., Knaff, J., Vonder Haar, T. H., 2004: Evaluation of advanced microwave sounding unit tropoical-cyclone intensity and size estimation algorithms, Journal of Applied Meteorology, vol. 43, 282-296
  • DeMaria, M., Dostalek, J. F., Knaff, J., Mueller, K. J., 2004: Improvements in deterministic and probablistic tropical cyclone surface wind predictions, 58th Interdepartmental Hurricane Conference.March 1-4, 2004, Charleston, SC
  • Knaff, J., DeMaria, M., Mueller, K. J., 2004: Methods to estimate and predict tropical cyclone wind structure: Recent developments and future goals, 58th Interdepartmental Hurricane Conference.March 1-4, 2004, Charleston, SC
  • Knaff, J., DeMaria, M., Demuth, J. L., Seseske, S. A., 2004: On the influences of vertical wind shear on symmetric tropical cyclone structure derived from AMSU, Monthly Weather Review, vol. 132, 2503-2510
  • Cecil, D., DeMaria, M., Jones, T. A., Knaff, J., 2004: Statistical forecasting of Pacific and Indian Ocean tropical cyclone intensity using 19-, 37-, and 85- GHz brightness temperatures, AMS 26th Conference on Hurricanes and Tropical Meteorology.May 3-7, 2004, Miami, FL
  • Bessho, K., DeMaria, M., Demuth, J. L., Knaff, J., 2004: Tropical cyclone wind retrievals from the advanced microwave sounding unit (AMSU): Application to surface wind analysis, AMS 26th Conference on Hurricanes and Tropical Meteorology.May 3-7, 2004, Miami, FL
  • Bessho, K., DeMaria, M., Demuth, J. L., Knaff, J., 2004: Tropical cycolne wind retreivals from the advanced microwave sounding unit (AMSU): Application to surface wind analysis, AMS 26th Conference on Hurricanes and Tropical Meteorology.May 3-7, 2004, Miami, FL
  • Demuth, J. L., DeMaria, M., Knaff, J., Vonder Haar, T. H., 2004: Validation of an advanced microwave sounder unit (AMSU) tropical cyclone intensity and size estimation algorithm, Journal of Applied Meteorology, vol. 43, 282-296
  • Knaff, J., DeMaria, M., Griffin, J. S., Marks, F. D., Wang, N., Zehr, R. M., 2003: A demonstration of real-time transmission and display of GOES imagery aboard the NOAA P-3 aircraft during the 2002 hurricane season, AMS 12th Conference on Satellite Meteorology and Oceanography.February 10-14, 2003, Long Beach, CA
  • Knaff, J., DeMaria, M., Kossin, J. P., 2003: Annular Hurricanes, Wea. Forecasting, vol. 18, 204-223
  • Chase, T. N., Kalnay, E., Knaff, J., Pielke, R. A., Sr., 2003: Changes in global monsoon circulations since 1950, Natural Hazards, vol. 29, 229-254
  • Reasor, P. D., Bosart, L. F., Gamache, J. F., Knaff, J., Marks, F. D., Montgomery, M. T., 2003: Diagnosing the role of convective hot towers in tropical cyclogenesis using airborne Doppler-derived winds, AMS Simpson Symposium.February 10-14, 2003, Long Beach, CA
  • DeMaria, M., Knaff, J., Kossin, J. P., Mainelli, M., Shay, L. K., 2003: Improvements in real-time statistical tropical cyclone intensity forecasts using satellite data, AMS 12th Conference on Satellite Meteorology and Oceanography.February 10-14, 2003, Long Beach, CA
  • Knaff, J., 2003: Research to better diagnose and predict tropical cyclone structure and intensity change
  • Knaff, J., DeMaria, M., Gross, J. M., Sampson, C. R., 2003: Statistical, five-day tropical cyclone intensity forecasts derived from climatology and persistence, Wea. Forecasting, vol. 18, 80-92
  • Demuth, J. L., Brueske, K. F., DeMaria, M., Knaff, J., Velden, C. S., 2002: An evaluation of CIMSS and CIRA AMSU tropical cyclone intensity estimation algorithms, AMS 25th Conference on Hurricanes and Tropical Meteorology.April 29-May 3, 2002, San Diego, CA
  • DeMaria, M., Brueske, K. F., Demuth, J. L., Knaff, J., Velden, C. S., Zehr, R. M., 2002: An update on Joint Hurricane Testbed (JHT) projects at CIRA and CIMSS, 56th Interdepartmental Hurricane Conference.March 11-15, 2002, New Orleans, LA
  • Knaff, J., Velden, C. S., 2002: Examining the eight-day evolution of upper level winds in Hurricane Floyd, AMS 25th Conference on Hurricanes and Tropical Meteorology.April 29-May 3, 2002, San Diego, CA
  • Landsea, C. W., Knaff, J., 2002: How much "skill" was there in forecasting the strong 1997-1998 El Nino and 1998-2001 La Nina events, AMS 15th Conference on Hurricanes and Tropical Meteorology.April 29-May 3, 2002, San Diego, CA
  • Weaver, J. F., Bikos, D. E., Knaff, J., 2002: Reply to comments on: Satellite observations of a severe supercell thunderstorm on 24 July 2000 made during the GOES-11 science test, Wea. Forecasting, vol. 17, 1118-1127
  • Weaver, J. F., Bikos, D. E., Daniels, J. M., Knaff, J., Wade, G., 2002: Satellite observations of a severe supercell thunderstorm on 24 July 2000 taken during the GOES-11 science test, Weather and Forecasting, vol. 17, 124-138
  • DeMaria, M., Knaff, J., Kossin, J. P., Zehr, R. M., 2002: The use of GOES imagery in statistical hurricane intensity prediction, AMS 25th Conference on Hurricanes and Tropical Meteorology.April 29-May 3, 2002, San Diego, CA
  • Knaff, J., DeMaria, M., Kossin, J. P., 2002: What are annular hurricanes, AMS 25th Conference on Hurricanes and Tropical Meteorology.April 29-May 3, 2002, San Diego, CA
  • DeMaria, M., Connell, B. H., Knaff, J., 2001: A tropical cyclone genesis parameter for the tropical Atlantic, Weather and Forecasting, vol. 16, 219-233
  • Pielke, R. A., Sr., Chase, T. N., Eastman, J. L., Kittel, T. G. F., Knaff, J., 2001: Analysis of 200 mb zonal wind for the period 1958-1997, J. Geophysical Research, vol. 106, 27287-27290
  • Knaff, J., Landsea, C. W., 2001: Application of the El Nino: Southern oscillation CLIimatoloty and PERsistence (CLIPER) forecasting scheme, Experimental Long-Lead Forecast Bulleting, vol. 10, 31-34
  • Landsea, C. W., Knaff, J., 2001: Application of the El Nino: Southern oscillation CLImatology and PERsistance (CLIPER) forecasting scheme, Experimental Long-Lead Forecast Bulletin, vol. 10, 31-33
  • Knaff, J., Landsea, C. W., 2001: Application of the El Nino: Southern oscillation CLImatology and PERsistence (CLIPER) forecasting scheme, Experimental Long-Lead Forecast Bulletin, vol. 10, 40-42
  • Landsea, C. W., Knaff, J., 2001: How much "skill" was there in forecasting the great 1997-98 El Nino and 1998-2000 La Nina events?, AMS 81st Annual Meeting.January 14-19, 2001, Albuquerque, NM
  • Kidder, S. Q., Knaff, J., Kuligowski, R. J., Kusselson, S. J., 2001: Improvements to the experimental tropical rainfall potential (TraP) technique, AMS 11th Conference on Satellite Meteorology and Oceanography.October 15-18, 2001, Madison, WI
  • Weaver, J. F., Daniels, J. M., Knaff, J., Wade, G., 2001: Observations of a severe supercell thunderstorm on 24 July using GOES-11 sounder and imagery, AMS 11th Conference on Satellite Meteorology and Oceanography.October 15-18, 2001, Madison, WI
  • Chase, T. N., Knaff, J., Pielke, R. A., Sr., 2001: Trends in global monsoon circulations: Evidence for a diminished hydrological cycle, 81st Annual AMS Meeting.January 14-19, 2001, Albuquerque, NM
  • Kidder, S. Q., Knaff, J., Kusselson, S. J., 2001: Using AMSU data to forecast precipitation from landfalling hurricanes, AMS 81st Annual Meeting.January 14-19, 2001, Albuquerque, NM
  • DeMaria, M., Demuth, J. L., Knaff, J., 2001: Validation of an advanced microwave sounder unit (AMSU) tropical cyclone intensity and size estimation algorithm, AMS 11th Conference on Satellite Meteorology and Oceanography.October 15-18,2001, Madison, WI
  • Chase, T. N., Eastman, J. L., Kittel, T. G. F., Knaff, J., Pielke, R. A., Sr., 2000: A comparison of regional trends in 1979-1997 depth-averaged tropospheric temperatures, Int. J. Climatol., vol. 20, 503-518
  • Knaff, J., Weaver, J. F., 2000: A mesoscale low-level thunderstorm outflow boundary associated with Hurricane Luis, Mon. Wea. Rev., vol. 128, 3352-3355
  • Dostalek, J. F., DeMaria, M., Knaff, J., 2000: Advanced Microwave Sounding Unit (AMSU) analyses of marine extratropical cyclones, Northwest Weather Workgroup.February 3-6, 2000, Seattle, WA
  • Knaff, J., Goldberg, M. D., Kidder, S. Q., Zehr, R. M., 2000: An example of temperature structure differences in two cyclone systems derived from the Advanced Microwave Sounder Unit, Wea. Forecasting, vol. 15, 476-483
  • Demuth, J. L., DeMaria, M., Knaff, J., Vonder Haar, T. H., 2000: An objective method for estimating tropical cyclone intensity and structure from NOAA-15 Advanced Microwave Sounding Unit (AMSU) data, AMS 24th Conference on Hurricanes and Tropical Meteorology.May 29-June 02, 2000, Fort Lauderdale, FL
  • Landsea, C. W., Knaff, J., 2000: How much skill was there in forecasting the great 1997-98 El Nino?, Bull. Amer. Meteor. Soc.
  • Knaff, J., Velden, C. S., 2000: Relationships between the multi-layered wind field and the intensity of Hurricane Floyd, AMS 24th Conference on Hurricanes and Tropical Meteorology.May 29-June 2, 2000, Fort Lauderdale, FL
  • Knaff, J., DeMaria, M., Demuth, J. L., 2000: Tropical cyclone forecast products derived from the Advance Microwave Sounding Unit, Interdepartmental Hurricane Conference.13-17 February 2000, Houston, TX
  • DeMaria, M., Goldberg, M. D., Kidder, S. Q., Knaff, J., 2000: Tropical cyclone wind retrievals using AMSU-A data from NOAA-15, AMS 10th Conference on Satellite Meteorology and Oceanography.January 14-18, 2000, Long Beach, CA
  • Knaff, J., Landsea, C. W., 1999: Application of the climatology and persistence ENSO forecast model, Experimental Long Lead Forecast Bulletin, vol. 2
  • Landsea, C. W., Knaff, J., Mestas-Nunez, A. M., Pielke, R. A., Sr., 1999: Atlantic basin hurricanes: Indices of climatic changes, Climatic Change, vol. 42, 89-129
  • Knaff, J., Zehr, R. M., 1999: Convective asymmetries in mature tropical cyclones associated with motion and vertical wind shear, AMS 23rd conference on Hurricanes and Tropical Meteorology.January 11-15, 1999, Dallas, TX
  • Zehr, R. M., DeMaria, M., Horsfall, F. M., Knaff, J., 1999: Observational tropical cyclone data archive and research, 53rd Interdepartmental Hurricane Conference.February 8-12, 1999, Biloxi, MS
  • Knaff, J., 1999: Tropical cyclone structure change as revealed by one-minute satellite imagery, AMS 23rd Conference on Hurricanes and Tropical Meteorology.January 11-15, 1999, Dallas, TX
  • Pielke, R. A., Sr., Chase, T. N., Eastman, J. L., Kittel, T. G. F., Knaff, J., 1998: 1973-1996 trends in depth-averaged tropospheric temperature, Journal of Geophysical Research, vol. 103, 16927-16934
  • Knaff, J., Eastin, M. D., 1998: A methodology for combining data sets for a detailed win analysis with tropical cyclones, J. Atmos. & Oceanic Tech (submitted)
  • Pielke, R. A., Sr., Chase, T. N., Eastman, J. L., Kittel, T. G. F., Knaff, J., 1998: Correction to 1973-1996 trends in depth-averaged tropospheric temperature, Journal of Geophysical Research, vol. 103, 28909-28911
  • Knaff, J., 1998: Predicting summertime Caribbean pressure in early April, J. Weather and Forecasting , vol. 13, 470-482
  • Pielke, R. A., Sr., Chase, T. N., Eastman, J. L., Kittel, T. G. F., Knaff, J., 1998: Trends in depth-averaged troposphere temperature, J. Geophys. Res., vol. 103, 16927-16934
  • Knaff, J., Landsea, C. W., 1997: An El Nino-southern oscillation climatology and persistence (CLIPER) forecasting scheme, J. Weather and Forecasting, vol. 12, 633-652
  • Knaff, J.: CONTINUED DEVELOPMENT OF TROPICAL CYCLONE WIND PROBABILITY PRODUCTS
  • Knaff, J., DeMaria, M., Grasso, L. D., Zehr, R. M.: DEVELOPMENT AND EVALUATION OF GOES AND POES PRODUCTS FOR TROPICAL CYCLONE AND PRECIPITATION ANALYSIS
  • Knaff, J.: DEVELOPMENT AND IMPLEMENTATION OF A STATISTICAL TROPICAL CYCLONE INTENSITY PREDICTION SCHEMES IN THE SOUTHERN HEMISPHERE AND NORTH INDIAN OCEAN
  • Vonder Haar, T. H., DeMaria, M., Knaff, J.: DEVELOPMENT AND IMPLEMENTATION OF A STATISTICAL TYPHOON INTENSITY PREDICTION SCHEME FOR THE WESTERN NORTH PACIFIC
  • Knaff, J.: DEVELOPMENT OF A MULTI-PLATFORM SATELLITE TROPICAL CYCLONE WIND ANALYSIS SYSTEM
  • Knaff, J.: DEVELOPMENT OF AN ANNULAR HURRICANE EYEWALL INDEX FOR TROPICAL CYCLONE INTENSITY FORECASTING
  • Knaff, J., DeMaria, M., Wang, N.: DEVELOPMENT OF EFFICIENT SATELLITE DATA COMPRESSION TECHNIQUES: TRANSMISSION OF GOES IMAGERY TO THE NOAA WP-3D AIRCRAFT
  • Knaff, J., DeMaria, M.: DEVELOPMENT OF TROPICAL CYCLONE WIND SPEED PROBABILITIES
  • Knaff, J.: EXPLOITING INFRARED SATELLITE DATA TO ESTIMATE TROPICAL CYCLONE WIND RADII
  • Knaff, J., DeMaria, M.: IMPLEMENTATION OF OPERATIONAL ENSEMBLE INTENSITY FORECASTS
  • Knaff, J.: IMPROVED STATISTICAL INTENSITY FORECAST MODELS
  • Knaff, J.: IMPROVEMENT IN DETERMINISTIC AND PROBABILISTIC TROPICAL CYCLONE SURFACE WIND PREDICTIONS
  • Knaff, J.: NPOESS APPLICATIONS TO TROPICAL CYCLONE ANALYSIS AND FORECASTING
  • Vonder Haar, T. H., DeMaria, M., Knaff, J., Zehr, R. M.: U.S. WEATHER RESEARCH PROGRAM JOINT GRANTS PROGRAM SATELLITE SUPPORT FOR THE NOAA HURRICANE FIELD PROGRAM
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