Severe Thunderstorm Watch 261

Issued

May 7, 2012, 12:46 PM CDT (17:46 UTC)

Expired

May 7, 2012, 9:00 PM CDT

In force

8 hr

Issued by

the Storm Prediction Center

Largest hail expected

3 in

Strongest gust expected

60 kt

The San Angelo radar (KSJT), 98 km from the middle of the area, began a volume at 17:42 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

40%

One or more gusts of 65 knots or more

30%

Ten or more severe hail reports

80%

One or more hailstones of 2 inches or more

70%

Six or more combined severe hail and wind reports

90%

• Mesoscale Discussion 745May 7, 2:24 PM CDT
• Mesoscale Discussion 746May 7, 2:37 PM CDT
• Mesoscale Discussion 750May 7, 5:31 PM CDT
• Mesoscale Discussion 751May 7, 6:55 PM CDT

897 
WWUS20 KWNS 071746
SEL1
SPC WW 071746
TXZ000-080200-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 261
NWS STORM PREDICTION CENTER NORMAN OK
1245 PM CDT MON MAY 7 2012

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

       SOUTHWEST AND WEST-CENTRAL TEXAS

EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 1245 PM UNTIL
900 PM CDT.

HAIL TO 3 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 85
STATUTE MILES EAST AND WEST OF A LINE FROM 20 MILES SOUTHEAST OF
DRYDEN TEXAS TO 65 MILES NORTHWEST OF BROWNWOOD TEXAS.  FOR A
COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
UPDATE (WOUS64 KWNS WOU1).

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...TSTMS ARE RAPIDLY DEVELOPING THIS AFTERNOON AHEAD OF
COLD FRONT AND LIKELY IN ASSOCIATION WITH A WEAK MIDLEVEL IMPULSE
MOVING THROUGH THE TX BIG BEND.  WARM SECTOR AIR MASS IS ALREADY
MODERATE-STRONGLY UNSTABLE OWING TO THE PRESENCE OF STEEP LAPSE
RATES AND A MOIST BOUNDARY LAYER.  WHEN COUPLED WITH 35-45 KT OF
DEEP SWLY SHEAR...SETUP WILL FAVOR THE DEVELOPMENT OF SUPERCELLS
CAPABLE OF VERY LARGE HAIL AND DAMAGING WIND GUSTS AS THE PRIMARY
HAZARDS.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 3 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550. MEAN STORM
MOTION VECTOR 27020.


...MEAD

Severe Thunderstorm Watches in Texas, 2012Every severe thunderstorm watch in 2012

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.