National Weather Service United States Department of Commerce

Very Heavy Rain, Severe Thunderstorms, and High Flash Flood Risk moves into the Mississippi Valley and Midwest

Thunderstorms, some severe, with very heavy rain have moved into the Mid South and Tennessee Valley today. Flash flooding and severe thunderstorms will be possible from the central Gulf Coast to the Upper Great Lakes. The greatest threat of excessive rains will be in portions of the Lower and Middle Mississippi Valleys. This storm system has a history of producing life threatening flash floods. Read More >

PUBLIC SEVERE WEATHER OUTLOOK  
NWS STORM PREDICTION CENTER NORMAN OK
0457 AM CDT FRI APR 10 2009
   
...SEVERE THUNDERSTORMS EXPECTED OVER PARTS OF THE TENNESSEE VALLEY
AND SOUTHERN APPALACHIANS THIS AFTERNOON AND TONIGHT...
   
THE NWS STORM PREDICTION CENTER IN NORMAN OK IS FORECASTING THE
DEVELOPMENT OF TORNADOES...LARGE HAIL...AND DAMAGING WINDS OVER
PARTS OF THE TENNESSEE VALLEY AND SOUTHERN APPALACHIANS THIS
AFTERNOON AND TONIGHT.
   
THE AREAS MOST LIKELY TO EXPERIENCE THIS ACTIVITY INCLUDE
   
          CENTRAL AND NORTHERN ALABAMA
          CENTRAL AND NORTHERN GEORGIA
          EASTERN MISSISSIPPI
          SOUTHERN NORTH CAROLINA
          UPSTATE SOUTH CAROLINA
          EAST TENNESSEE
   
SURROUNDING THE HIGHEST THREAT AREA...SEVERE STORMS ARE ALSO
POSSIBLE FROM SOUTHERN MISSISSIPPI NORTH AND EAST INTO PARTS OF
KENTUCKY...SOUTHERN WEST VIRGINA...AND SOUTHERN VIRGINIA.
   
THE INTENSE UPPER LEVEL STORM THAT PRODUCED SEVERE THUNDERSTORMS AND
EXTREME WILD FIRE CONDITIONS OVER THE LOWER MISSISSIPPI VALLEY AND
SOUTHERN PLAINS LATE YESTERDAY WILL CONTINUE EAST ACROSS THE
TENNESSEE VALLEY TODAY AND THE CAROLINAS TONIGHT.
   
AT LOWER LEVELS AHEAD OF THE STORM......WARM AND INCREASINGLY MOIST
AIR WILL MOVE RAPIDLY NORTHEAST INTO ALABAMA...GEORGIA...EAST
TENNESSEE...AND PARTS OF THE CAROLINAS.
   
AT THE SAME TIME...A SEPARATE BAND OF VERY STRONG JET STREAM WINDS
WILL SPREAD EAST ACROSS MISSISSIPPI AND ALABAMA ON THE PERIPHERY OF
THE UPPER STORM.
   
THE COMBINATION OF STRENGTHENING WINDS AND INCREASING MOISTURE WILL
CREATE AN ENVIRONMENT FAVORABLE FOR THE DEVELOPMENT OF ROTATING
THUNDERSTORMS CALLED SUPERCELLS AS DAYTIME HEATING FURTHER
DESTABILIZES PARTS OF THE SOUTHEASTERN UNITED STATES LATER TODAY.
   
THE EXPECTED INTENSITY OF THE STORMS...AND THEIR LIKELY
LONGEVITY...SUGGESTS THAT SOME COULD YIELD STRONG TORNADOES...IN
ADDITION TO VERY LARGE HAIL AND DAMAGING WINDS.
   
MOST OF THE SEVERE WEATHER IS EXPECTED TO OCCUR THIS AFTERNOON
THROUGH EARLY THIS EVENING...BUT ISOLATED SEVERE STORMS MAY PERSIST
THROUGH EARLY SATURDAY IN THE CAROLINAS.
   
STATE AND LOCAL EMERGENCY MANAGERS ARE MONITORING THIS DEVELOPING
SITUATION. THOSE IN THE THREATENED AREA ARE URGED TO REVIEW SEVERE
WEATHER SAFETY RULES AND TO LISTEN TO RADIO...TELEVISION...AND NOAA
WEATHER RADIO FOR POSSIBLE WATCHES...WARNINGS...AND STATEMENTS LATER
TODAY.
   
..CORFIDI.. 04/10/2009