SWODY1
SPC AC 281610
DAY 1 CONVECTIVE OUTLOOK CORR 1
NWS STORM PREDICTION CENTER NORMAN OK
1110 AM CDT WED APR 28 2010
VALID 281630Z - 291200Z
...NO SVR TSTM AREAS FORECAST...
CORRECTED FOR SPELLING
...NORTHERN PLAINS...
LARGE SCALE TROUGH CONTINUES TO AMPLIFY WRN U.S. WHILE ONE STRONG
S/W ROTATES NEWD ACROSS NRN PLAINS BY THIS EVENING. FROM A DEEP LOW
OVER NCENTRAL MT A STRONG COLD FRONT EXTENDS SWD THRU CENTRAL WY
THEN TO SWRN UT THIS AM. 40-50 KT SLY LOW LEVEL JET CENTRAL/NRN
PLAINS CONTAINS ONLY MARGINAL MOISTURE WITH PW/S NO GREATER THAN .5
INCHES CURRENTLY FROM CENTRAL TX NWD. MORE SUBSTANTIAL MOISTURE
CURRENTLY OVER SRN GOM WILL NOT ARRIVE INTO THE CENTRAL U.S. UNTIL
THU/FRI.
WITH STRONG HEATING PRIOR TO FROPA IN NRN PLAINS THIS
AFTERNOON...LOW/MID LEVEL LAPSE RATES WILL BE NEAR DRY ADIABATIC.
WHILE DEWPOINTS EXPECTED TO BE NO HIGHER THAN MID 40S F...MLCAPES
COULD CLIMB TO 500 J/KG JUST PRIOR TO ARRIVAL OF THE COLD FRONT.
ISOLATED HIGH BASED THUNDERSTORMS SHOULD DEVELOP LATE THIS AFTERNOON
NEAR AND JUST AHEAD OF THE COLD FRONT FROM WRN NE NWD TO ND. THE
COMBINATION OF VERY STRONG WIND PROFILES AND STEEP LAPSE RATES WILL
BE ADEQUATE TO MAINTAIN A LOW PROBABILITY OF BRIEF DAMAGING WINDS
AND HAIL WITH THE STRONGEST UPDRAFTS THRU THIS EVENING.
..HALES.. 04/28/2010
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