SWODY1
SPC AC 281603
DAY 1 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
1103 AM CDT WED APR 28 2010
VALID 281630Z - 291200Z
...NO SVR TSTM AREAS FORECAST...
...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 SUBSTANIAL 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 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.
HIGH BASED THUNDERSTORMS SHOULD DEVELOP LATE THIS AFTERNOON NEAR AND
JUST AHEAD OF THE COLD FORNT FROM WRN NE NWD TO ND. THE COMBINATION
OF VERY STRONG WIND PROFILES AND STEEP LAPSE RATES WILL BE ADEQUATE
TO MAINTAIN OF A LOW PROBABILITY OF BRIEF DAMAGING W+
INDS AND HAIL WITH THE STRONGEST UPDRAFTS THRU THIS EVENING.
..HALES/GRAMS .. 04/28/2010
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