Severe Thunderstorm Watch 263

Issued

May 7, 2012, 3:27 PM CDT (20:27 UTC)

Expired

May 7, 2012, 10:30 PM CDT

In force

7 hr

Issued by

the Storm Prediction Center

Largest hail expected

2 in

Strongest gust expected

60 kt

The Austin/San Antonio radar (KEWX), 117 km from the middle of the area, began a volume at 20:27 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

30%

Ten or more severe hail reports

50%

One or more hailstones of 2 inches or more

40%

Six or more combined severe hail and wind reports

80%

• Mesoscale Discussion 746May 7, 2:37 PM CDT
• Mesoscale Discussion 750May 7, 5:31 PM CDT
• Mesoscale Discussion 753May 7, 7:54 PM CDT

154 
WWUS20 KWNS 072028
SEL3
SPC WW 072028
TXZ000-080400-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 263
NWS STORM PREDICTION CENTER NORMAN OK
325 PM CDT MON MAY 7 2012

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

       CENTRAL AND SOUTHWEST TEXAS

EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 325 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 85
STATUTE MILES EAST AND WEST OF A LINE FROM 75 MILES SOUTHWEST OF
HONDO TEXAS TO 30 MILES NORTH OF WACO 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 261...WW 262...

DISCUSSION...SEVERE TSTMS IN PROGRESS OVER THE CONCHO VALLEY ARE
EXPECTED TO MOVE ESEWD INTO THE AREA LATE THIS AFTERNOON WITH
ADDITIONAL SEVERE STORMS EXPECTED TO CROSS THE INTERNATIONAL BORDER
INTO THE EDWARDS PLATEAU THIS EVENING.  AIR MASS ACROSS THE WATCH
AREA IS HOT AND QUITE MOIST WITH MLCAPE VALUES UPWARDS OF 2500-3500
J/KG.  WHILE REGION WILL REMAIN ON THE ERN FRINGE OF STRONGER SWLY
MIDLEVEL FLOW ALOFT...THE DEGREE OF INSTABILITY WILL PROMOTE
ORGANIZED UPDRAFTS/POSSIBLE SUPERCELLS CAPABLE OF DAMAGING WINDS AND
LARGE HAIL.

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 550. MEAN STORM
MOTION VECTOR 31025.


...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.