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Tornado Watch 499
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WW0499 Radar
Hazard Tornadoes EF2+ Tornadoes
Likelihood Moderate Moderate
Severe Wind 65 kt+ Wind
High Moderate
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
   TORNADO WATCH NUMBER 499
   NWS STORM PREDICTION CENTER NORMAN OK
   335 PM CDT TUE SEP 9 2014

   THE NWS STORM PREDICTION CENTER HAS ISSUED A

   * TORNADO WATCH FOR PORTIONS OF 
     SOUTHWEST IOWA
     NORTHERN KANSAS
     NORTHWEST MISSOURI
     SOUTHERN AND EASTERN NEBRASKA

   * EFFECTIVE THIS TUESDAY AFTERNOON FROM 335 PM UNTIL MIDNIGHT
     CDT.

   * PRIMARY THREATS INCLUDE...
     A FEW TORNADOES AND A COUPLE INTENSE TORNADOES POSSIBLE
     SCATTERED DAMAGING WINDS LIKELY WITH ISOLATED SIGNIFICANT GUSTS
       TO 75 MPH POSSIBLE
     SCATTERED LARGE HAIL AND ISOLATED VERY LARGE HAIL EVENTS TO 2
       INCHES IN DIAMETER POSSIBLE

   THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 60 STATUTE
   MILES NORTH AND SOUTH OF A LINE FROM 50 MILES SOUTHWEST OF
   KEARNEY NEBRASKA TO 60 MILES EAST OF SHENANDOAH IOWA.  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.

   &&

   DISCUSSION...TSTMS EXPECTED TO FORM LATER THIS AFTN THROUGH THIS EVE
   ALONG STRENGTHENING W-E WARM FRONT/DIFFERENTIAL HEATING ZONE NEAR
   THE NEB-KS BORDER. OTHER STORMS WITH MAINLY A SVR WIND/MARGINAL HAIL
   THREAT MAY CONTINUE TO FORM/STRENGTHEN OVER FAR ERN NEB/WRN IA...IN
   ZONE OF ASCENT/WAA AHEAD OF WEAKEN ERN NEB UPR IMPULSE.
   WHILE MID-LVL WARMING IN WAKE OF ERN NEB UPR IMPULSE CASTS SOME
   UNCERTAINTY ON THERMODYNAMIC PROFILES IN WW AREA THIS EVE...ATTM IT
   APPEARS THAT COMBINATION OF CONTINUED SFC HEATING...RICH LOW-LVL
   MOISTURE...AND EXPECTED STRENGTHENING/TEMPORAL VEERING OF 700 MB
   FLOW WILL CREATE ENVIRONMENT FAVORABLE FOR AT LEAST A FEW
   SUPERCELLS...ONCE WARM LAYER IS BREACHED BY UPLIFT ALONG BOUNDARY.
   OVERALL SETUP APPEARS FAVORABLE FOR A CONDITIONAL RISK FOR TORNADOES
   IN ADDITION TO DMGG WIND/SVR HAIL. THE ACTIVITY SHOULD MERGE INTO A
   LEWP-BEARING MCS LATER THIS EVE...WITH A CONTINUING RISK FOR DMGG
   WIND/TORNADOES.

   AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
   SURFACE AND ALOFT TO 2 INCHES. EXTREME TURBULENCE AND SURFACE
   WIND GUSTS TO 65 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
   550. MEAN STORM MOTION VECTOR 25035.


   ...CORFIDI
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Page last modified: September 10, 2014
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