

021 

WWUS20 KWNS 140408

SEL8

SPC WW 140408

ARZ000-LAZ000-MSZ000-OKZ000-TNZ000-TXZ000-141100-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 78

NWS STORM PREDICTION CENTER NORMAN OK

1110 PM CDT SUN APR 13 2014



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

  SOUTHERN AND EASTERN ARKANSAS

  NORTHWESTERN LOUISIANA

  NORTHERN MISSISSIPPI

  EXTREME SOUTHEASTERN OKLAHOMA

  WESTERN TENNESSEE

  NORTHEAST TEXAS



* EFFECTIVE THIS SUNDAY NIGHT AND MONDAY MORNING FROM 1110 PM

  UNTIL 600 AM CDT.



* PRIMARY THREATS INCLUDE...

  SCATTERED DAMAGING WINDS AND ISOLATED SIGNIFICANT GUSTS TO 75

    MPH POSSIBLE

  ISOLATED LARGE HAIL EVENTS TO 1.5 INCHES IN DIAMETER POSSIBLE

  A TORNADO OR TWO POSSIBLE



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 90

STATUTE MILES EAST AND WEST OF A LINE FROM 50 MILES WEST OF

SHREVEPORT LOUISIANA TO 30 MILES WEST NORTHWEST OF JACKSON

TENNESSEE.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU8).



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.



&&



OTHER WATCH INFORMATION...THIS SEVERE THUNDERSTORM WATCH REPLACES

TORNADO WATCH NUMBER 76. WATCH NUMBER 76 WILL NOT BE IN EFFECT

AFTER 1110 PM CDT. CONTINUE...WW 75...WW 77...



DISCUSSION...TWO PRIMARY TSTM COMPLEXES WILL MOVE ACROSS WW AREA

OVERNIGHT AMIDST FAVORABLE DEEP SHEAR...

1. INITIAL SMALL QLCS THAT WILL OFFER ADDITIONAL DAMAGING-WIND

THREAT AS IT MOVES ACROSS PROGRESSIVELY WEAKER INSTABILITY IN WRN

TN...BEFORE WEAKENING...AND

2. LARGER/NEAR-FRONTAL QLCS THAT WILL MOVE ACROSS ARKLATEX REGION

AND CENTRAL/ERN AR...ALSO POTENTIALLY PRODUCING DAMAGING WIND.

BRIEF/QLCS TORNADO ALSO CANNOT BE RULED OUT BUT IS NOT PRIMARY

THREAT.  AIR MASS BEHIND WRN TN ACTIVITY MAY RECOVER N OF I-40 IN

LOW-LEVEL WAA ZONE...AND AT LEAST MRGL BUOYANCY IS EXPECTED TO

LINGER FARTHER SW ALONG/AHEAD OF COLD FRONT.



AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT

TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 65

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM

MOTION VECTOR 26035.





...EDWARDS

