SWODY2
SPC AC 201636
DAY 2 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
1136 AM CDT TUE SEP 20 2011
VALID 211200Z - 221200Z
...NO SVR TSTM AREAS FORECAST...
...GREAT LAKES REGION...
A RATHER LARGE UPPER LOW WILL BE PRESENT ON WEDNESDAY OVER THE
NORTHERN PLAINS AND UPPER GREAT LAKES REGION...WITH A STRONG
SHORTWAVE TROUGH LIFTING NORTHEASTWARD ACROSS PORTIONS OF IND/LOWER
MI/OH DURING THE AFTERNOON. THIS WILL HELP TO INITIATE SCATTERED
SHOWERS AND THUNDERSTORMS IN THE WARM SECTOR ACROSS THE UPPER OH
VALLEY. SURFACE DEWPOINTS IN THE 60S AND THE POTENTIAL FOR STRONG
HEATING WILL LIKELY YIELD MLCAPE VALUES OF 500-1500 J/KG. PRESENT
INDICATIONS ARE THAT A NARROW REGION OF THREAT WILL DEVELOP DURING
THE AFTERNOON FOR THOSE STORMS THAT FORM ALONG/AHEAD OF THE
APPROACHING COLD FRONT ACROSS SOUTHEAST LOWER MI AND NORTHERN OH.
LOW/MID LEVEL WIND FIELDS WILL BE VEERED...BUT SUFFICIENTLY STRONG
TO SUPPORT A RISK OF GUSTY/DAMAGING WINDS.
ELSEWHERE ACROSS THE NATION...SCATTERED THUNDERSTORMS WILL BE
POSSIBLE OVER MUCH OF THE EASTERN STATES AND SOUTHERN ROCKIES/HIGH
PLAINS. THESE STORMS ARE EXPECTED TO REMAIN GENERALLY BELOW SEVERE
LIMITS.
..HART.. 09/20/2011
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