SWODY1
SPC AC 221614
DAY 1 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
1114 AM CDT FRI MAY 22 2009
VALID 221630Z - 231200Z
...NO SVR TSTM AREAS FORECAST...
ANOTHER QUIET CONVECTIVE DAY IS EXPECTED TODAY ACROSS MUCH OF THE
UNITED STATES AS STRONG WESTERLIES ARE CONFINED TO THE NORTHERN TIER
OF STATES...AND RICH LOW LEVEL MOISTURE ONLY RESIDES OVER THE
SOUTHEAST REGION. SCATTERED AFTERNOON THUNDERSTORMS ARE EXPECTED
OVER THE GULF COAST STATES IN ASSOCIATION WITH BROAD UPPER LOW OFF
IN THE CENTRAL GULF. HOWEVER...EXTENSIVE CLOUDS AND WEAK LAPSE
RATES WILL COMBINE WITH MARGINAL VERTICAL SHEAR TO SUPPRESS
ORGANIZED SEVERE STORMS.
...NEB/SD/WY...
WEAK EASTERLY/UPSLOPE LOW LEVEL FLOW IS FORECAST TO DEVELOP OVER
WESTERN NEB AND EASTERN WY THIS AFTERNOON. THIS WILL HELP TO
TRANSPORT SLIGHTLY MORE MOIST AND UNSTABLE AIRMASS INTO HIGHER
TERRAIN OF EASTERN WY...WHERE CONCENSUS OF MESOSCALE AND OPERATIONAL
MODELS DEVELOP SCATTERED STORMS. THESE STORMS MAY DEVELOP EASTWARD
INTO WESTERN NEB DURING THE EVENING. WEAK FLOW ALOFT WILL RESULT IN
SLOW MOVING MULTICELL CLUSTERS CAPABLE OF SOME HAIL.
..HART/HURLBUT.. 05/22/2009
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