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Tornado Watch 315
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WW0315 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.
   SEL5

   URGENT - IMMEDIATE BROADCAST REQUESTED
   TORNADO WATCH NUMBER 315
   NWS STORM PREDICTION CENTER NORMAN OK
   650 PM CDT TUE JUN 17 2014

   THE NWS STORM PREDICTION CENTER HAS ISSUED A

   * TORNADO WATCH FOR PORTIONS OF 
     NORTHWEST IOWA
     NORTHEAST NEBRASKA
     SOUTHEAST SOUTH DAKOTA

   * EFFECTIVE THIS TUESDAY NIGHT AND WEDNESDAY MORNING FROM 650 PM
     UNTIL 100 AM CDT.

   * PRIMARY THREATS INCLUDE...
     A FEW TORNADOES POSSIBLE
     SCATTERED LARGE HAIL AND ISOLATED VERY LARGE HAIL EVENTS TO 3
       INCHES IN DIAMETER LIKELY
     SCATTERED DAMAGING WIND GUSTS TO 70 MPH POSSIBLE

   THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 50 STATUTE
   MILES NORTH AND SOUTH OF A LINE FROM 45 MILES WEST SOUTHWEST OF
   YANKTON SOUTH DAKOTA TO 60 MILES EAST NORTHEAST OF SIOUX CITY
   IOWA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED
   WATCH OUTLINE UPDATE (WOUS64 KWNS WOU5).

   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 311...WW 313...WW 314...

   DISCUSSION...THUNDERSTORM INITIATION IS EXPECTED SOON ALONG THE WARM
   FRONT NEAR THE NE NEB/SE SD BORDER.  THE COMBINATION OF STRONG
   BUOYANCY /MLCAPE IN EXCESS OF 4000 J PER KG/...EFFECTIVE BULK SHEAR
   AOA 40 KT...AND EFFECTIVE SRH IN EXCESS OF 200 M2/S2 WILL FAVOR A
   RISK FOR TORNADOES AND VERY LARGE HAIL WITH INITIAL DISCRETE
   SUPERCELLS.  BY LATE EVENING...STORMS SHOULD GROW UPSCALE INTO A
   CLUSTER OR TWO WHILE MOVING EWD INTO IA...WITH AN INCREASING RISK
   FOR DAMAGING WINDS BY EARLY TONIGHT.

   AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
   SURFACE AND ALOFT TO 3 INCHES. EXTREME TURBULENCE AND SURFACE
   WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
   600. MEAN STORM MOTION VECTOR 27020.


   ...THOMPSON
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Page last modified: June 18, 2014
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