CLEX-9 October 30th, 2001 Operations
- The CLEX-9 forecast team has decided to stand by all operations for Tuesday, October 30th.
- Weather Forecast (made at 1500 MST 10/29/01):
We are on standby for possible WYKA and SPEC CLEX operations on Tuesday,
30 October 2001. The earliest GO/NO GO decision will be at 0600 MST (1300Z).
Expect earliest possible takeoff for the King Air at 0800 MST (1500Z) and
for the SPEC Learjet at 0930 MST (1630Z). The target for operations is over
North Platte. MODUS overpass at 1040 MST (1740Z)
The CLEX region is just to the east of an upper level (500-mb) ridge. The
ridge is 'dirty' with abundant moisture rotating through. Mid-upper level
cloud conditions have been patchy and largely orographically induced. Not
ideal CLEX conditions.
The ETA predicts a moderate PVA max over LBF by 12Z on Tuesday. The only
problem is most of the moisture is above ideal CLEX-cloud levels. Any mid-
level clouds will likely be accompanied by patchy to solid cirrus.
We will make a GO/NO-GO decision NLT 0600 MST (1300Z) after determining the
availability of suitable types of clouds over LBF.
On Wednesday, conditions will be more complex as the ridge axis moves through
NE and we come under influence of upper-level trough with embedded short-waves.
Clouds may be favorable for CLEX operations as ETA keeps plentiful 500-mb
moisture. By Thursday, NW’erly flow takes over as the trof moves through,
but marginal PAC moisture amounts may keep clouds from advecting over the CLEX
- Morning Update (made at 0630 MST 10/30/01):
We are STANDING DOWN all WYKA and SPEC CLEX operations today (Tuesday, 30 October 2001).
The CLEX region is currently under a huge shield of orographically induced cirrus.
John Davis reports thin cirrus over North Platte between 9 and 12 Km AGL. As upper-level
moisture continues to stream in from the SW, associated with an upper-level trof that is
off the western US, the forecast is for more orographically induced cirrus over the CLEX
target region throughout the day. As Jim noted yesterday, "Not ideal CLEX conditions."
On Wednesday, the models continue to move 500 mb moisture our way as the upper level ridge
axis begins to rotate through. Will have to see how the 12Z model update handles the
moisture tomorrow. As the upper-level trof makes its way closer, conditions for mid-level
cloud formation should improve. The only caveat will be overlaying cirrus cloud (which makes
identifying mid-level cloud a bit tricky). By Thursday, NW’erly flow begins to move into
the region. The models seem to keep some decent 500 mb moisture in our area through Thursday
morning - with clearing conditions as the day continues. Will have to see if this solution
Sunrise Information for North Platte, NE
(longitude W100.8, latitude N41.1):
Central Standard Time
Begin civil twilight 6:44 a.m.
Sunrise 7:13 a.m.
Sun transit 12:27 p.m.
Sunset 5:41 p.m.
End civil twilight 6:10 p.m.
1200Z 500 mb Map
1215Z GOES IR Image
- No UW King Air Operations
North Platte, NE Ground Operations
- Ground Instrument Status: Microwave Radiometer is still down.
Data Collection Highlights:
- Summary: Nothing to report