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Severe Thunderstorm Watch 309
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WW0309 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.
   SEL9

   URGENT - IMMEDIATE BROADCAST REQUESTED
   SEVERE THUNDERSTORM WATCH NUMBER 309
   NWS STORM PREDICTION CENTER NORMAN OK
   955 PM CDT MON JUN 16 2014

   THE NWS STORM PREDICTION CENTER HAS ISSUED A

   * SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 
     CENTRAL AND WEST CENTRAL IOWA
     NORTHEAST NEBRASKA
     EXTREME SOUTHEAST SOUTH DAKOTA

   * EFFECTIVE THIS MONDAY NIGHT AND TUESDAY MORNING FROM 955 PM
     UNTIL 400 AM CDT.

   * PRIMARY THREATS INCLUDE...
     SCATTERED DAMAGING WIND GUSTS TO 70 MPH POSSIBLE
     ISOLATED VERY LARGE HAIL EVENTS TO 2 INCHES IN DIAMETER POSSIBLE

   THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 45
   STATUTE MILES NORTH AND SOUTH OF A LINE FROM 20 MILES NORTHWEST
   OF NORFOLK NEBRASKA TO 50 MILES NORTHEAST OF KNOXVILLE IOWA.  FOR
   A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
   OUTLINE UPDATE (WOUS64 KWNS WOU9).

   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.

   &&

   OTHER WATCH INFORMATION...THIS SEVERE THUNDERSTORM WATCH REPLACES
   TORNADO WATCH NUMBER 303...TORNADO WATCH NUMBER 305. WATCH NUMBER
   303 305 WILL NOT BE IN EFFECT AFTER 955 PM CDT. CONTINUE...WW
   306...WW 307...WW 308...

   DISCUSSION...CONVECTION IN NE NEB/NW IA WILL CONTINUE TO EXPAND AND
   LIKELY MOVE ESEWD ALONG THE SLOW-MOVING OUTFLOW BOUNDARY INTO
   CENTRAL IA...IN THE WAKE OF THE LEAD CONVECTIVE SYSTEM MOVING INTO
   ERN IA.  A CONTINUED FEED OF UNSTABLE AIR FROM THE S/SW WILL
   MAINTAIN STRONG UPDRAFTS AND THE RISK FOR LARGE HAIL...WHILE
   DAMAGING GUSTS WILL ALSO BE POSSIBLE...ESPECIALLY IF STORMS CONGEAL
   INTO ANOTHER BOWING SEGMENT FROM NE NEB INTO WRN IA.

   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 550. MEAN STORM
   MOTION VECTOR 29030.


   ...THOMPSON
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Page last modified: June 17, 2014
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