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Severe Thunderstorm Watch 55
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WW0055 Radar
Hazard Tornadoes EF2+ Tornadoes
Likelihood Low Very Low
Severe Wind 65 kt+ Wind
Low Low
Severe Hail 2"+ Hail
Moderate Low

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
   SEVERE THUNDERSTORM WATCH NUMBER 55
   NWS STORM PREDICTION CENTER NORMAN OK
   345 PM CDT SAT APR 11 2015

   THE NWS STORM PREDICTION CENTER HAS ISSUED A

   * SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 
     EXTREME SOUTHEAST COLORADO
     EXTREME SOUTHWEST KANSAS
     TJE WESTERN OKLAHOMA PANHANDLE
     THE WESTERN HALF OF THE TEXAS PANHANDLE

   * EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 345 PM UNTIL
     900 PM CDT.

   * PRIMARY THREATS INCLUDE...
     ISOLATED DAMAGING WIND GUSTS TO 70 MPH POSSIBLE
     ISOLATED LARGE HAIL EVENTS TO 1.5 INCHES IN DIAMETER POSSIBLE

   THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 45
   STATUTE MILES EAST AND WEST OF A LINE FROM 40 MILES NORTHEAST OF
   SPRINGFIELD COLORADO TO 45 MILES SOUTHWEST OF AMARILLO TEXAS. 
   FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
   OUTLINE UPDATE (WOUS64 KWNS WOU5).

   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.

   &&

   DISCUSSION...THUNDERSTORM DEVELOPMENT IS UNDERWAY IN SMALL CLUSTERS
   ACROSS SE CO AND ALONG I-40 W OF AMA.  THESE AREAS AGREE WELL WITH
   SHORT-TERM MODEL FORECASTS...AND THE DOWNSTREAM ENVIRONMENT HAS
   SUFFICIENT BUOYANCY /MLCAPE NEAR 1500 J PER KG/ AND VERTICAL SHEAR
   /EFFECTIVE SHEAR AOA 40 KT/ FOR SUPERCELLS.  LARGE HAIL WILL BE THE
   MAIN CONCERN THROUGH THIS EVENING GIVEN THE MODERATE BUOYANCY AND
   STEEP LAPSE RATES.

   AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
   TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
   KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 450. MEAN STORM
   MOTION VECTOR 27020.


   ...THOMPSON
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Page last modified: April 12, 2015
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