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Severe Thunderstorm Watch 283
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WW0283 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.
   SEL3
   
   URGENT - IMMEDIATE BROADCAST REQUESTED
   SEVERE THUNDERSTORM WATCH NUMBER 283
   NWS STORM PREDICTION CENTER NORMAN OK
   655 PM CDT SAT MAY 19 2012
   
   THE NWS STORM PREDICTION CENTER HAS ISSUED A
   SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 
   
          NORTHWEST IOWA
          FAR NORTHEAST NEBRASKA
   
   EFFECTIVE THIS SATURDAY NIGHT AND SUNDAY MORNING FROM 655 PM
   UNTIL 200 AM 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 60
   STATUTE MILES EAST AND WEST OF A LINE FROM 35 MILES SOUTH OF
   SIOUX CITY IOWA TO 30 MILES NORTHEAST OF SPENCER IOWA.  FOR A
   COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
   UPDATE (WOUS64 KWNS WOU3).
   
   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 281...WW 282...
   
   DISCUSSION...SEVERE TSTMS IN PROGRESS OVER ERN NEB ARE EXPECTED TO
   MOVE/DEVELOP NEWD ACROSS THE WATCH AREA THIS EVENING INTO TONIGHT IN
   ADVANCE OF MIDLEVEL VORTICITY MAXIMUM CURRENTLY OVER S-CNTRL NEB. 
   00Z OAX SOUNDING INDICATES THAT PRE-FRONTAL AIR MASS HAS BECOME
   MODERATELY UNSTABLE OWING TO STEEP LAPSE RATES AND A RELATIVELY
   MOIST BOUNDARY LAYER.  WHEN COUPLED WITH AROUND 40 KT OF DEEP SWLY
   SHEAR...SETUP WILL SUPPORT POSSIBLE SUPERCELL STRUCTURES WITH A RISK
   FOR LARGE HAIL AND 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 500. MEAN STORM
   MOTION VECTOR 24025.
   
   
   ...MEAD
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