SWODY1
SPC AC 081208
DAY 1 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0708 AM CDT WED APR 08 2009
VALID 081300Z - 091200Z
...NO SVR TSTM AREAS FORECAST...
...GREAT BASIN/ROCKIES...
UPPER LOW OVER NORTHERN CA WILL MOVE EASTWARD ACROSS THE GREAT BASIN
TODAY...SPREADING COLD TEMPERATURES ALOFT AND STEEP LAPSE RATES OVER
MUCH OF THE WESTERN STATES. DAYTIME HEATING AND LIFT ASSOCIATED
WITH THE UPPER LOW WILL RESULT IN A BROAD AREA OF POTENTIAL FOR
AFTERNOON THUNDERSTORMS FROM THE EASTERN GREAT BASIN ACROSS THE
CENTRAL AND NORTHERN ROCKIES. HAIL WILL BE POSSIBLE IN STRONGER
CORES...BUT NO SEVERE WEATHER IS ANTICIPATED.
...NEB/KS...
LOW LEVEL WARM ADVECTION WILL INCREASE RAPIDLY OVERNIGHT AS SURFACE
CYCLOGENESIS ENHANCES THE LOW LEVEL JET. THIS WILL RESULT IN AN
INCREASING RISK OF ISOLATED CONVECTION FROM PARTS OF NEB/KS INTO
MO/AR. MOST OF THIS ACTIVITY WILL LIKELY OCCUR SHORTLY AFTER
12Z...BUT AT LEAST PARTS OF NEB/KS MAY SEE THUNDERSTORMS BEFORE THE
END OF THIS FORECAST PERIOD.
...KY/TN/VA...
MID LEVEL SPEED MAX IS TRACKING SOUTH-SOUTHEASTWARD ACROSS THE UPPER
MS VALLEY THIS MORNING. THIS FEATURE IS EXPECTED TO ROTATE INTO THE
OH VALLEY BY AFTERNOON AND RESULT IN SCATTERED PRECIPITATION FOR
PARTS OF KY/WV/TN/VA. FORECAST SOUNDINGS SUGGEST THAT THERMODYNAMIC
PROFILES WILL BE MARGINAL FOR CHARGE SEPARATION. THE AREA OF
GREATEST RISK FOR A FEW LIGHTNING STRIKES WILL BE OVER SOUTHEASTERN
KY/EASTERN TN WHERE SLIGHTLY WARMER PROFILES ARE ANTICIPATED.
..HART/HURLBUT.. 04/08/2009
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