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Severe Thunderstorm Watch 448
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WW0448 Radar
Hazard Tornadoes EF2+ Tornadoes
Likelihood Low Very Low
Severe Wind 65 kt+ Wind
Moderate Low
Severe Hail 2"+ Hail
Moderate Moderate

Note:  The expiration time in the watch graphic is amended if the watch is replaced, cancelled or extended.
Note: Click for Watch Status Reports.
   SEL8
   
   URGENT - IMMEDIATE BROADCAST REQUESTED
   SEVERE THUNDERSTORM WATCH NUMBER 448
   NWS STORM PREDICTION CENTER NORMAN OK
   535 PM MDT WED JUN 17 2009
   
   THE NWS STORM PREDICTION CENTER HAS ISSUED A
   SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 
   
          PARTS OF NORTHWEST NEBRASKA
          MUCH OF WESTERN AND CENTRAL SOUTH DAKOTA
   
   EFFECTIVE THIS WEDNESDAY AFTERNOON AND THURSDAY MORNING FROM 535
   PM UNTIL 100 AM MDT.
   
   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 110
   STATUTE MILES NORTH AND SOUTH OF A LINE FROM 50 MILES WEST
   SOUTHWEST OF RAPID CITY SOUTH DAKOTA TO 35 MILES EAST SOUTHEAST
   OF PIERRE SOUTH DAKOTA.  FOR A COMPLETE DEPICTION OF THE WATCH
   SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU8).
   
   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 439...WW 440...WW
   441...WW 442...WW 443...WW 445...WW 444...WW 446...WW 447...
   
   DISCUSSION...STORMS CONTINUE TO INCREASE ACROSS THE WW AREA AHEAD OF
   A MID-LEVEL SHORT-WAVE TROUGH EJECTING NEWD FROM THE CENTRAL
   ROCKIES.  SOMEWHAT MODEST INSTABILITY /500 TO 1000 J/KG MIXED-LAYER
   CAPE/ EXISTS ACROSS THIS AREA...BUT WITH THE NRN FRINGE OF STRONGER
   WSWLY MID-LEVEL FLOW EXTENDING ACROSS THIS REGION...STORMS
   DEVELOPING IN CONJUNCTION WITH THE EJECTING UPPER FEATURE SHOULD
   REMAIN LOCALLY-ORGANIZED -- AND CAPABLE OF PRODUCING HAIL AND
   LOCALLY-DAMAGING WINDS.
   
   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 450. MEAN STORM
   MOTION VECTOR 24035.
   
   
   ...GOSS
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