Example of satellite cloud climatologies being used for local forecasts.

Thursday, March 13, 2014

Example of satellite cloud climatologies being used for local forecasts. Monterey was interested in marine stratus layer that often covers their forecast area. Both figures above are cloud percent climatologies from GOES satellite (channels 2 (3.6 mm) and 4 (10.7 mm)) covering June and July 1999-2003 at 1000 UTC over the Monterey/San Francisco area. The color bar at the bottom of each figure represents the percent of low/water clouds during the time period when specific pressure conditions are met. Figure a) is when the sea level pressure between Arcata, CA and San Francisco is less than 2.5 mb, and Figure b) is when the difference is greater than 5 mb. By looking at time series of composites under each set of conditions during the day, the forecaster has a better idea of how far inland the marine stratus layer can be expected to extend, and approximately when to expect it to burn off during the day.