Severe Thunderstorm Watch 73

Issued

Mar 29, 2011, 3:57 PM CDT (20:57 UTC)

Expired

Mar 29, 2011, 11:00 PM CDT

In force

7 hr

Issued by

the Storm Prediction Center

Largest hail expected

2.5 in

Strongest gust expected

60 kt

The Laughlin AFB radar (KDFX), 111 km from the middle of the area, began a volume at 20:57 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

Two or more tornadoes

20%

One or more EF2 to EF5 tornadoes

5%

Ten or more severe wind reports

30%

One or more gusts of 65 knots or more

20%

Ten or more severe hail reports

30%

One or more hailstones of 2 inches or more

40%

Six or more combined severe hail and wind reports

70%

• Mesoscale Discussion 303Mar 29, 2:18 PM CDT
• Mesoscale Discussion 307Mar 29, 5:59 PM CDT
• Mesoscale Discussion 311Mar 29, 8:17 PM CDT
• Mesoscale Discussion 313Mar 29, 10:15 PM CDT

338 
WWUS20 KWNS 292056
SEL3
SPC WW 292056
TXZ000-CWZ000-300400-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 73
NWS STORM PREDICTION CENTER NORMAN OK
355 PM CDT TUE MAR 29 2011

THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

       SOUTH-CENTRAL TEXAS
       COASTAL WATERS

EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 355 PM UNTIL
1100 PM CDT.

HAIL TO 2.5 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 120
STATUTE MILES EAST AND WEST OF A LINE FROM 60 MILES NORTH
NORTHWEST OF SAN ANTONIO TEXAS TO 35 MILES WEST SOUTHWEST OF
ALICE TEXAS.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU3).

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 72...

DISCUSSION...STRONG/SEVERE TSTMS ARE EXPECTED TO DEVELOP...PRIMARILY
IN VICINITY OF A SOUTH-SOUTHEAST ADVANCING COLD FRONT...THROUGH LATE
AFTERNOON/EARLY EVENING ACROSS THE TRANSPECOS REGION/RIO GRANDE
VICINITY AND EVENTUALLY TX HILL COUNTRY. VEERING WIND PROFILES AND
VERY STEEP LAPSE RATES ALOFT/MODERATE INSTABILITY WILL SUPPORT SOME
SUPERCELLS/EVENTUAL LINEAR SEGMENTS CAPABLE OF LARGE HAIL AS WELL AS
ISOLATED DAMAGING WINDS.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM
MOTION VECTOR 27025.


...GUYER/HART

Severe Thunderstorm Watches in Texas, 2011Every severe thunderstorm watch in 2011

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.