SWODY1
SPC AC 271623
DAY 1 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
1123 AM CDT TUE APR 27 2010
VALID 271630Z - 281200Z
...NO SVR TSTM AREAS FORECAST...
...SOUTHEAST...
MID LEVEL LOW ROTATING EAST SOUTHEASTWARD ACROSS THE TN VALLEY IS
FORECAST TO TRACK RAPIDLY ACROSS THE CENTRAL APPALACHIANS THIS
AFTERNOON AND PROVIDE LARGE SCALE FORCING FOR ASCENT. STEEP MID
LEVEL LAPSE RATES...AS SAMPLED BY THE 12Z BNA SOUNDING...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 THIS AFTERNOON 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.
...INTERIOR NORTHWEST STATES...
COLD FRONT ERN WA/OR SWWD TO OFF CA COAST PRECEDES A STRONG MID
LEVEL SHORTWAVE TROUGH CURRENTLY MOVING ONSHORE THIS MORNING. STRONG
LARGE SCALE LIFT WILL OVERSPREAD MUCH OF WA/ORE/ID TODAY...WHERE
RELATIVELY STEEP LOW/MID LEVEL LAPSE RATES ARE EXPECTED. WARM SECTOR
PRECEDING THE COLD FRONT CHARACTERIZED BY DRY LOW LEVELS AND
CONSIDERABLE MID LEVEL CLOUDINESS. THUS ANY IMPORTANT THUNDERSTORM
DEVELOPMENT WILL BE ALONG AND IN THE POST-FRONTAL AIR MASS WHERE
GREATEST LIFT AND MID LEVEL COOLING WILL BE OCCURRING WITH THE UPPER
TROUGH. INSTABILITY STILL EXPECTED TO BE MEAGER WITH NO MORE THAN A
COUPLE HUNDRED JOULES OF MLCAPE. STRONG DEEP LAYER SHEAR OF 60-70
KT AND STEEP LAPSE RATES WILL SUPPORT POTENTIAL FOR GUSTY/LOCAL
DAMAGING WINDS AND PRIMARILY SMALL HAIL.
..HALES/GRAMS.. 04/27/2010
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