SPC Day 1 Thunderstorm Outlook Issued 01Z 20030411


ZCZC SPCSWODY1 ALL
ACUS01 KWNS 110054
SPC AC 110051

STORM PREDICTION CENTER...NWS/NCEP...NORMAN OK 
DAY 1 CONVECTIVE OUTLOOK...REF AWIPS GRAPHIC PGWE46 KWNS.

VALID 110100Z - 111200Z

NO SVR TSTM AREAS FCST.

GEN TSTMS ARE FCST TO THE RIGHT OF A LINE FROM 25 SE EWN 15 W GSB
20 WSW GSO 15 NNW PSK 10 NE EKN AOO 30 SSW AVP 25 NE NEL.

GEN TSTMS ARE FCST TO THE RIGHT OF A LINE FROM 30 SE MFR 50 E EUG
35 NNW RDM 35 ENE RDM 70 WSW BNO 10 NNW 4LW 40 SSE LMT 30 SE MFR.



...MIDDLE ATLANTIC...

REGIONAL RADAR/SATELLITE IMAGERY SUGGEST CENTER OF UPPER LOW IS
WOBBLING SLIGHTLY WEST OF NORTH ALONG THE SC/NC BORDER NEAR CLT. 
WITH COOL BOUNDARY LAYER AIR MASS WEDGED EAST OF THE
MOUNTAINS...LOW LEVEL WARM ADVECTION HAS PROVEN THE PRIMARY REASON
FOR ASCENT/CONVECTION LIFTING NWD ACROSS VA.  AS ELY LLJ WEAKENS
ACROSS THIS REGION IT APPEARS CONVECTIVE THREAT WILL SLOWLY
DECREASE...ESPECIALLY AFTER MIDNIGHT.  PROBABILITY FOR ADDITIONAL
THUNDERSTORM DEVELOPMENT SOUTH OF THE FRONT OVER NC/SC IS NOW
MINIMAL GIVEN THE LOSS OF HEATING.

...CASCADES...

00Z SOUNDINGS ACROSS THE PACIFIC NW AND NRN GREAT BASIN DEPICT
DEEPENING BOUNDARY LAYER AND INCREASING INSTABILITY...GENERALLY ON
THE ORDER OF 100-200 J/KG.  ISOLATED THUNDERSTORMS MAY PERSIST
ALONG THE CASCADES FOR THE NEXT FEW HOURS BEFORE INSTABILITY
DECREASES DUE TO DIURNAL COOLING.
 
..DARROW.. 04/11/03

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