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Severe Thunderstorm Watch 145
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WW0145 Radar
Hazard Tornadoes EF2+ Tornadoes
Likelihood Low Very Low
Severe Wind 65 kt+ Wind
Low Very Low
Severe Hail 2"+ Hail
Low 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.
   SEL5
   
   URGENT - IMMEDIATE BROADCAST REQUESTED
   SEVERE THUNDERSTORM WATCH NUMBER 145
   NWS STORM PREDICTION CENTER NORMAN OK
   1025 PM CDT MON APR 29 2013
   
   THE NWS STORM PREDICTION CENTER HAS ISSUED A
   
   * SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 
     CENTRAL AND EASTERN IOWA
     NORTHWEST ILLINOIS
     SOUTHWEST WISCONSIN
   
   * EFFECTIVE THIS MONDAY NIGHT AND TUESDAY MORNING FROM 1025 PM
     UNTIL 500 AM CDT.
   
   * PRIMARY THREATS INCLUDE...
     A FEW VERY LARGE HAIL EVENTS TO 2.5 INCHES IN DIAMETER POSSIBLE
     A FEW DAMAGING WIND GUSTS TO 70 MPH POSSIBLE
   
   THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 70
   STATUTE MILES NORTH AND SOUTH OF A LINE FROM 60 MILES WEST OF DES
   MOINES IOWA TO 30 MILES NORTHEAST OF DUBUQUE IOWA.  FOR A
   COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
   UPDATE (WOUS64 KWNS WOU5).
   
   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.
   
   &&
   
   DISCUSSION...THUNDERSTORMS ARE NOW INCREASING IN NUMBER ACROSS
   CENTRAL IOWA IN THE PRESENCE OF LARGE SCALE ASCENT ASSOCIATED WITH
   LOW-LEVEL WARM ADVECTION...WHICH LIKELY WILL STRENGTHEN ON THE NOSE
   OF AN INTENSIFYING 850 MB JET INTO THE OVERNIGHT HOURS.  DESPITE
   SOMEWHAT MARGINAL MOISTURE...INSTABILITY ASSOCIATED WITH VERY STEEP
   LAPSE RATES WILL CONTINUE TO SUPPORT THE RISK FOR LARGE HAIL IN
   STRONGEST STORMS.  ACTIVITY MAY GRADUALLY CONSOLIDATE INTO A SMALL
   STORM CLUSTER...WITH SOME INCREASE IN POTENTIAL FOR DAMAGING WINDS
   WHILE SPREADING NORTHEASTWARD TOWARD SOUTHWESTERN WISCONSIN AND
   NORTHWESTERN ILLINOIS.
   
   AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
   TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
   KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM
   MOTION VECTOR 24035.
   
   
   ...KERR
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