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Severe Thunderstorm Watch 557
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WW0557 Radar
Hazard Tornadoes EF2+ Tornadoes
Likelihood Low Very 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.
   SEL7

   URGENT - IMMEDIATE BROADCAST REQUESTED
   SEVERE THUNDERSTORM WATCH NUMBER 557
   NWS STORM PREDICTION CENTER NORMAN OK
   310 PM CST SAT NOV 22 2014

   THE NWS STORM PREDICTION CENTER HAS ISSUED A

   * SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 
     PARTS OF THE RIO GRANDE VALLEY AND DEEP SOUTH TEXAS
     COASTAL WATERS

   * EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 310 PM UNTIL
     1000 PM CST.

   * PRIMARY THREATS INCLUDE...
     SCATTERED LARGE HAIL AND ISOLATED VERY LARGE HAIL EVENTS TO 2
       INCHES IN DIAMETER POSSIBLE
     SCATTERED DAMAGING WIND GUSTS TO 70 MPH POSSIBLE
     A TORNADO OR TWO POSSIBLE

   THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 65
   STATUTE MILES EAST AND WEST OF A LINE FROM 65 MILES NORTH
   NORTHEAST OF DEL RIO TEXAS TO 20 MILES SOUTHEAST OF MCALLEN
   TEXAS.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED
   WATCH OUTLINE UPDATE (WOUS64 KWNS WOU7).

   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...THUNDERSTORMS ARE FORMING OVER THE E SLOPES OF THE
   MOUNTAINS IN NE MEXICO...AND WILL LIKELY MOVE ACROSS THE RIO GRANDE
   INTO TX IN THE NEXT 2-3 HOURS AS A MIDLEVEL TROUGH CONTINUES MOVING
   EWD.  MODERATE INSTABILITY IS PRESENT OVER THE RIO GRANDE
   VALLEY...WITH THE STRONGEST VERTICAL SHEAR EXPECTED FARTHER S IN
   PROXIMITY TO THE MID-UPPER JET.  SUPERCELLS WILL BE POSSIBLE WITH
   THE INITIAL STORMS...WITH LARGE HAIL THE MAIN RISK GIVEN RELATIVELY
   STEEP MIDLEVEL LAPSE RATES.  OTHERWISE...STORMS MAY TEND TO GROW
   UPSCALE BY LATE EVENING ACROSS S TX WITH AN INCREASING RISK FOR
   DAMAGING WINDS...AND PERHAPS A TORNADO CLOSER TO THE COAST WHERE
   LOW-LEVEL SHEAR WILL BE SOMEWHAT STRONGER.

   AVIATION...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 26035.


   ...THOMPSON
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Page last modified: November 23, 2014
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