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Severe Thunderstorm Watch 401
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WW0401 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.
   SEL1
   
   URGENT - IMMEDIATE BROADCAST REQUESTED
   SEVERE THUNDERSTORM WATCH NUMBER 401
   NWS STORM PREDICTION CENTER NORMAN OK
   520 PM MDT SAT JUN 13 2009
   
   THE NWS STORM PREDICTION CENTER HAS ISSUED A
   SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 
   
          NORTHERN AND WESTERN NEBRASKA
          SOUTHWEST SOUTH DAKOTA
          NORTHEAST WYOMING `
   
   EFFECTIVE THIS SATURDAY AFTERNOON AND SUNDAY MORNING FROM 520 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 105
   STATUTE MILES EAST AND WEST OF A LINE FROM 45 MILES NORTHWEST OF
   RAPID CITY SOUTH DAKOTA TO 5 MILES EAST OF NORTH PLATTE NEBRASKA.
    FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
   OUTLINE UPDATE (WOUS64 KWNS WOU1).
   
   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 397...WW 398...WW
   399...WW 400...
   
   DISCUSSION...SCTD SUPERCELLS/STRONG STORM CLUSTERS EXPECTED TO
   PERSIST THROUGH LATE TONIGHT FROM NE WY/BLACK HILLS SSE INTO
   NEB...WHERE LOW LVL WARM/MOIST ADVECTION WILL PERSIST BENEATH AREA
   OF UPR DIFFLUENCE ON CREST OF UPR RIDGE.  A LOW PROBABILITY RISK MAY
   EVOLVE FOR A TORNADO OR TWO IN NEBRASKA...DEPENDING UPON STORM
   MODE/CHARACTER OF DEVELOPMENT...BUT MAIN RISK IN WW SHOULD BE 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 31025.
   
   
   ...CORFIDI
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