SWODY1
SPC AC 271223
DAY 1 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0723 AM CDT TUE APR 27 2010
VALID 271300Z - 281200Z
...NO SVR TSTM AREAS FORECAST...
...SOUTHEAST...
MORNING WATER VAPOR LOOPS SHOW A STRONG MID LEVEL LOW ROTATING
SOUTHEASTWARD ACROSS THE MID MS VALLEY. THIS FEATURE IS FORECAST TO
TRACK RAPIDLY INTO THE CENTRAL APPALACHIANS BY THIS AFTERNOON AND
PROVIDE LARGE SCALE FORCING FOR ASCENT. STEEP MID LEVEL LAPSE RATES
OVER PARTS OF THE SOUTHEAST COMBINED WITH STRONG DAYTIME HEATING AND
COOLING ALOFT WILL YIELD POCKETS OF AFTERNOON MLCAPE OF 250-500
J/KG. SCATTERED SHOWERS AND THUNDERSTORMS ARE EXPECTED TO INTENSIFY
BY LATE MORNING OVER PARTS OF EAST TN/NORTH GA AND TRACK EASTWARD
INTO THE CAROLINAS. DESPITE WEAK CAPE VALUES...FORECAST SOUNDINGS
IN THIS REGION SUGGEST THE POTENTIAL FOR HAIL AND GUSTY WINDS IN THE
STRONGER CELLS. THE THREAT SHOULD WEAKEN RAPIDLY THIS EVENING WITH
THE LOSS OF DAYTIME HEATING.
...NORTHWEST STATES...
A STRONG MID LEVEL SHORTWAVE TROUGH IS MOVING ASHORE THIS MORNING
OVER WESTERN ORE/NORTHWEST CA. STRONG LARGE SCALE LIFT WILL
OVERSPREAD MUCH OF WA/ORE/ID TODAY...WHERE RELATIVELY STEEP LOW/MID
LEVEL LAPSE RATES ARE EXPECTED. SCATTERED THUNDERSTORMS ARE
FORECAST TO INTENSIFY BY MID-LATE AFTERNOON OVER CENTRAL/EASTERN
WA/ORE AND TRACK EASTWARD INTO WESTERN ID. STRONG LOW LEVEL AND
EFFECTIVE SHEAR VALUES INDICATE THE POTENTIAL FOR SUPERCELL/BOW
STRUCTURES CAPABLE OF GUSTY WINDS AND HAIL.
..HART/SMITH.. 04/27/2010
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