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