

375 

WWUS20 KWNS 022059

SEL0

SPC WW 022059

TXZ000-CWZ000-030400-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 80

NWS STORM PREDICTION CENTER NORMAN OK

345 PM CDT TUE APR 2 2013



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       MIDDLE AND UPPER TEXAS COASTAL PLAIN

       COASTAL WATERS



EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 345 PM UNTIL

1100 PM CDT.



HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70

MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 80

STATUTE MILES EAST AND WEST OF A LINE FROM 65 MILES NORTH

NORTHWEST OF HOUSTON TEXAS TO 70 MILES WEST OF ANGLETON TEXAS.

FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU0).



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...CONTINUE...WW 79...



DISCUSSION...GIVEN PERSISTENT MOIST LOW-LVL INFLOW AND EXPECTED

INCREASE IN UPR-LVL DIVERGENCE WITH THE CONTINUED ENE MOVEMENT OF

NRN MEXICO UPR IMPULSE...SCTD...SUSTAINED...DISCRETE STORMS EXPECTED

TO CONTINUE FORMING INVOF DIFFUSE WARM FRONT EXTENDING FROM THE ERN

PARTS OF THE TX HILL COUNTRY SE TO NEAR BAY CITY ON THE MIDDLE TX

GULF CST. THESE STORMS MAY POSE A THREAT FOR LARGE HAIL AND LOCALLY

DMGG WIND...AND MAY SLOWLY MERGE INTO A SMALL MCS LATER THIS EVE. IN

ADDITION...35 KT WSWLY DEEP SHEAR AND BACKED LOW-LVL WINDS MAY

PROMOTE LOW-LVL STORM ROTATION AND A CONDITIONAL TORNADO RISK.

ATTM...MODEST STRENGTH OF 850-700 MB FLOW EXPECTED TO LIMIT

HODOGRAPH SIZE AND TORNADO POTENTIAL...BUT ENVIRONMENT AND STORM

BEHAVIOR WILL BE MONITORED FOR POSSIBLE WW UPGRADE THROUGH THE EVE.



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 500. MEAN STORM

MOTION VECTOR 26020.





...CORFIDI

