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Severe Thunderstorm Watch 502
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WW0502 Radar
Hazard Tornadoes EF2+ Tornadoes
Likelihood Low Very Low
Severe Wind 65 kt+ Wind
Moderate Low
Severe Hail 2"+ Hail
Low Very Low

Note:  The expiration time in the watch graphic is amended if the watch is replaced, cancelled or extended.
Note: Click for Watch Status Reports.
   SEL2

   URGENT - IMMEDIATE BROADCAST REQUESTED
   SEVERE THUNDERSTORM WATCH NUMBER 502
   NWS STORM PREDICTION CENTER NORMAN OK
   325 PM CDT WED SEP 10 2014

   THE NWS STORM PREDICTION CENTER HAS ISSUED A

   * SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 
     CENTRAL...EASTERN...AND SOUTHERN ILLINOIS
     NORTHWEST INDIANA
     EAST CENTRAL AND SOUTHEAST MISSOURI

   * EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 325 PM
     UNTIL 800 PM CDT.

   * PRIMARY THREATS INCLUDE...
     SCATTERED DAMAGING WIND GUSTS TO 70 MPH POSSIBLE
     ISOLATED LARGE HAIL EVENTS TO 1 INCH IN DIAMETER POSSIBLE
     A TORNADO OR TWO POSSIBLE

   THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 85
   STATUTE MILES EAST AND WEST OF A LINE FROM 55 MILES NORTH OF
   LAFAYETTE INDIANA TO 45 MILES SOUTH SOUTHWEST OF SCOTT AFB
   ILLINOIS.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
   ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU2).

   PRECAUTIONARY/PREPAREDNESS ACTIONS...

   REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE
   FAVORABLE FOR 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. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY
   DO PRODUCE TORNADOES.

   &&

   OTHER WATCH INFORMATION...CONTINUE...WW 501...

   DISCUSSION...TSTMS EXPECTED TO CONTINUE SLOWLY INCREASE ALONG
   CONFLUENCE BANDS AHEAD OF SE-MOVING CNTRL MO/NRN IL COLD FRONT
   THROUGH LATER TNGT. DEVELOPMENT WILL BE FOSTERED BY ASCENT/WEAK
   MID-LVL COLD ADVECTION ON SRN FRINGE OF ERN IA UPR IMPULSE...SFC
   HEATING...AND CONTINUED MOISTURE INFLOW. WHILE WSWLY DEEP SHEAR
   SHOULD WEAKEN WITH TIME AS STRONGER LEAD UPR IMPULSE CONTINUES NE
   ACROSS LK ERIE...AMPLE SHEAR SHOULD REMAIN FOR SUSTAINED
   STORMS/POSSIBLE SUPERCELLS GIVEN EXPECTED THERMODYNAMIC ENVIRONMENT
   AND AT LEAST MODEST LOW-LVL CONVERGENCE. WHILE THE MAIN SVR THREAT
   SHOULD BE LOCALLY DMGG WIND...A TORNADO OR TWO CANNOT BE RULED
   OUT...ESPECIALLY IN CNTRL/ERN IL AND PERHAPS ADJACENT SE MO.

   AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
   TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60 KNOTS.
   A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 450. MEAN STORM MOTION
   VECTOR 26035.


   ...CORFIDI
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Page last modified: September 11, 2014
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