

539 

WWUS20 KWNS 222108

SEL7

SPC WW 222108

TXZ000-CWZ000-230400-



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



741 

WWUS20 KWNS 222108

SEL7

SPC WW 222108

TXZ000-CWZ000-230400-



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

