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Severe Thunderstorm Watch 374
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WW0374 Radar
Hazard Tornadoes EF2+ Tornadoes
Likelihood Low Very Low
Severe Wind 65 kt+ Wind
Moderate Moderate
Severe Hail 2"+ Hail
Moderate 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.
   SEL4
   
   URGENT - IMMEDIATE BROADCAST REQUESTED
   SEVERE THUNDERSTORM WATCH NUMBER 374
   NWS STORM PREDICTION CENTER NORMAN OK
   840 AM CDT THU JUN 11 2009
   
   THE NWS STORM PREDICTION CENTER HAS ISSUED A
   SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 
   
          MIDDLE AND EASTERN TENNESSEE
   
   EFFECTIVE THIS THURSDAY MORNING AND AFTERNOON FROM 840 AM UNTIL
   200 PM CDT.
   
   HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70
   MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.
   
   THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 55
   STATUTE MILES NORTH AND SOUTH OF A LINE FROM 55 MILES SOUTH
   SOUTHWEST OF CLARKSVILLE TENNESSEE TO 40 MILES EAST SOUTHEAST OF
   CROSSVILLE TENNESSEE.  FOR A COMPLETE DEPICTION OF THE WATCH SEE
   THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU4).
   
   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 373...
   
   DISCUSSION...A WELL-DEFINED MCV IS MOVING EWD FROM WRN INTO MIDDLE
   TN THIS MORNING.  THE 12Z SOUNDING FROM NASHVILLE SHOWED MLCAPE OF
   ALMOST 3000 J/KG AND MINIMAL CONVECTIVE INHIBITION...WHILE THE
   MEMPHIS VWP REVEALED A 40-50 KT JET AS LOW AS 2 KM AGL IN
   ASSOCIATION WITH THE MCV.  THIS COMBINATION OF INGREDIENTS WILL
   SUPPORT CONTINUED THUNDERSTORM DEVELOPMENT ACROSS MIDDLE TN AND
   SPREADING EWD INTO ERN TN LATER THIS MORNING INTO EARLY
   AFTERNOON...WHERE THE STRONGER STORMS WILL BE CAPABLE OF PRODUCING
   DAMAGING WINDS AND LARGE HAIL.
   
   AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
   TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
   KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM
   MOTION VECTOR 27030.
   
   
   ...THOMPSON
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