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Tornado Watch 109
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WW0109 Radar
Hazard Tornadoes EF2+ Tornadoes
Likelihood Moderate Low
Severe Wind 65 kt+ Wind
Moderate Low
Severe Hail 2"+ Hail
High 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
   TORNADO WATCH NUMBER 109
   NWS STORM PREDICTION CENTER NORMAN OK
   115 PM CDT MON APR 28 2014

   THE NWS STORM PREDICTION CENTER HAS ISSUED A

   * TORNADO WATCH FOR PORTIONS OF 
     SOUTH CENTRAL AND SOUTHEAST IOWA
     WEST CENTRAL ILLINOIS
     EAST CENTRAL AND NORTHEAST MISSOURI

   * EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 115 PM UNTIL
     700 PM CDT.

   * PRIMARY THREATS INCLUDE...
     A FEW TORNADOES POSSIBLE
     WIDESPREAD LARGE HAIL LIKELY WITH ISOLATED VERY LARGE HAIL
       EVENTS TO 2 INCHES IN DIAMETER POSSIBLE
     ISOLATED DAMAGING WIND GUSTS TO 70 MPH POSSIBLE

   THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 75 STATUTE
   MILES EAST AND WEST OF A LINE FROM 40 MILES NORTH OF OTTUMWA IOWA
   TO 15 MILES SOUTHWEST OF SCOTT AFB ILLINOIS.  FOR A COMPLETE
   DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE
   (WOUS64 KWNS WOU9).

   PRECAUTIONARY/PREPAREDNESS ACTIONS...

   REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR
   TORNADOES AND 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.

   &&

   OTHER WATCH INFORMATION...CONTINUE...WW 108...

   DISCUSSION...ARC OF LOW-TOPPED STORMS WILL CONTINUE TO DEVELOP FROM
   ERN MO INTO SRN IA THROUGH THE AFTERNOON.  STEEP LAPSE RATES AND
   STRONG SURFACE HEATING HAVE CONTRIBUTED TO MLCAPE OF 1000-1500 J/KG
   AND SUFFICIENT VERTICAL SHEAR FOR SUPERCELLS.  LARGE HAIL WILL BE
   THE MAIN RISK...THOUGH A FEW TORNADOES WILL BE POSSIBLE AS STORMS
   MOVE CLOSER TO THE STRONGER LOW-LEVEL SHEAR ZONE ALONG THE WARM
   FRONT...AND WITH DEVELOPING UPDRAFTS IN IA ALONG THE BOUNDARY WHERE
   VERTICAL VORTICITY IS STRONGEST.

   AVIATION...TORNADOES AND 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 19030.


   ...THOMPSON
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Page last modified: April 29, 2014
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