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Tornado Watch 411
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WW0411 Radar
Hazard Tornadoes EF2+ Tornadoes
Likelihood Moderate 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.
   SEL1

   URGENT - IMMEDIATE BROADCAST REQUESTED
   TORNADO WATCH NUMBER 411
   NWS STORM PREDICTION CENTER NORMAN OK
   500 PM CDT SAT JUL 12 2014

   THE NWS STORM PREDICTION CENTER HAS ISSUED A

   * TORNADO WATCH FOR PORTIONS OF 
     SOUTHERN AND EASTERN IOWA
     NORTHWEST ILLINOIS
     NORTHERN MISSOURI

   * EFFECTIVE THIS SATURDAY AFTERNOON FROM 500 PM UNTIL MIDNIGHT
     CDT.

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

   THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 100 STATUTE
   MILES EAST AND WEST OF A LINE FROM 40 MILES NORTHEAST OF CEDAR
   RAPIDS IOWA TO 30 MILES SOUTH SOUTHEAST OF LAMONI IOWA.  FOR A
   COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
   UPDATE (WOUS64 KWNS WOU1).

   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.

   &&

   DISCUSSION...SCTD TSTMS EXPECTED TO FORM THROUGH MID-EVE IN
   MOIST...VERY WARM...AND CONFLUENT WSWLY LOW-LVL FLOW AHEAD OF
   ACCELERATING COLD FRONT NOW EXTENDING FROM NE IA TO SE NEB.
   LARGE-SCALE ASCENT MAY BE ENHANCED BY WEAK IMPULSE TRACKING ENE
   ACROSS NEB/IA AHEAD OF AMPLIFYING NRN STREAM TROUGH NOW OVER SRN MB.
   COMBINATION OF STRENGTHENING LLJ...MOIST LOW-LVL
   ENVIRONMENT...COOLING BOUNDARY LAYER...AND SEMI-DISCRETE STORMS
   SUGGESTS POTENTIAL FOR A COUPLE TORNADOES IN ADDITION TO SVR
   WIND/HAIL.

   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
   550. MEAN STORM MOTION VECTOR 28030.


   ...CORFIDI
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Page last modified: July 13, 2014
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