SEVERE THUNDERSTORMS INCLUDING TORNADIC SUPERCELLS

Major Tornado Outbreak Forecast — High Risk Area Expanded...
A major tornado outbreak is forecast later this afternoon into 
tonight over portions of the mid-Mississippi and lower Ohio Valleys.
 SPC has expanded the High Risk area for severe thunderstorms to 
include parts of northeastern Arkansas, western Tennessee, 
southeastern Missouri,southern Illinois, western and central 
Kentucky and southern Indiana.
 Surrounding the High Risk, a Moderate Risk area extends from 
southern Arkansas and Mississippi to central Indiana and western Ohio. 
Conditions are favorable for long-track, violent tornadoes in 
both the Moderate Risk and High Risk areas.
 The storms will also be capable of producing very large hail, 
damaging straight-line winds, frequent cloud-to-ground 
lightning and torrential rainfall. 
Severe thunderstorms and large, damaging tornadoes this afternoon
 and evening could affect significant population centers including 
St. Louis, Little Rock, Memphis, Nashville, Louisville, 
Cincinnati, and Indianapolis.
URGENT - IMMEDIATE BROADCAST REQUESTED
   TORNADO WATCH NUMBER 376
   NWS STORM PREDICTION CENTER NORMAN OK
   835 PM CDT WED MAY 25 2011

   THE NWS STORM PREDICTION CENTER HAS ISSUED A
   TORNADO WATCH FOR PORTIONS OF 

          PARTS OF NORTHWEST ALABAMA
          PARTS OF SOUTHERN INDIANA
          LARGE PART OF CENTRAL KENTUCKY
          MUCH OF NORTHERN MISSISSIPPI
          PARTS OF WESTERN OHIO
          MUCH OF MIDDLE AND PARTS OF WESTERN TENNESSEE

   EFFECTIVE THIS WEDNESDAY NIGHT AND THURSDAY MORNING FROM 835 PM
   UNTIL 400 AM CDT.

   TORNADOES...HAIL TO 3 INCHES IN DIAMETER...THUNDERSTORM WIND
   GUSTS TO 90 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
   AREAS.

   THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 70 STATUTE
   MILES EAST AND WEST OF A LINE FROM 15 MILES SOUTHWEST OF TUPELO
   MISSISSIPPI TO 25 MILES NORTHEAST OF DAYTON OHIO.  FOR A COMPLETE
   DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE
   (WOUS64 KWNS WOU6).

   REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR
   TORNADOES AND SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH
   AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR
   THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS
   AND POSSIBLE WARNINGS.

   DISCUSSION...SEVERE THUNDERSTORMS INCLUDING TORNADIC SUPERCELLS
   CONTINUE TO DEVELOP AND MOVE EWD ACROSS OH AND TN VALLEYS.  VERY
   STRONG DAMAGING WINDS HAVE DEVELOPED ACROSS LOWER OHIO VALLEY AND
   MOVE EWD ACROSS THE WATCH.  STILL POTENTIAL FOR VERY STRONG
   TORNADOES BOTH WITH THE QLCS LINE AND MORE DISCRETE STORMS IN
   ADVANCE.

   AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
   SURFACE AND ALOFT TO 3 INCHES. EXTREME TURBULENCE AND SURFACE
   WIND GUSTS TO 80 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
   550. MEAN STORM MOTION VECTOR 24040.

http://www.weather.gov/
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