Tornado Watch 138

Issued

Apr 13, 2007, 6:27 PM CDT (23:27 UTC)

Expired

Apr 14, 2007, 2:00 AM CDT

In force

8 hr

Issued by

the Storm Prediction Center

Largest hail expected

2.5 in

Strongest gust expected

60 kt

The Austin/San Antonio radar (KEWX), 58 km from the middle of the area, began a volume at 23:29 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

40%

One or more EF2 to EF5 tornadoes

20%

Ten or more severe wind reports

40%

One or more gusts of 65 knots or more

30%

Ten or more severe hail reports

70%

One or more hailstones of 2 inches or more

40%

Six or more combined severe hail and wind reports

90%

• Mesoscale Discussion 483Apr 13, 5:58 PM CDT
• Mesoscale Discussion 484Apr 13, 8:42 PM CDT
• Mesoscale Discussion 485Apr 13, 9:54 PM CDT

000
WWUS20 KWNS 132325
SEL8  
SPC WW 132325
TXZ000-140700-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 138
NWS STORM PREDICTION CENTER NORMAN OK
625 PM CDT FRI APR 13 2007

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

       SOUTH CENTRAL TEXAS

EFFECTIVE THIS FRIDAY NIGHT AND SATURDAY MORNING FROM 625 PM
UNTIL 200 AM CDT.

TORNADOES...HAIL TO 2.5 INCHES IN DIAMETER...THUNDERSTORM WIND
GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
AREAS.

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 95 STATUTE
MILES EAST AND WEST OF A LINE FROM 45 MILES NORTH OF AUSTIN TEXAS
TO 50 MILES SOUTH SOUTHEAST OF HONDO TEXAS.  FOR A COMPLETE
DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE
(WOUS64 KWNS WOU8).

REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR
TORNADOES AND 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.

OTHER WATCH INFORMATION...CONTINUE...WW 133...WW 134...WW
135...WW 136...WW 137...

DISCUSSION...THUNDERSTORMS DEVELOPING ALONG/AHEAD OF COLD FRONT. 
WITH MLCAPES TO 3000 J/KG AND DEEP LAYER SHEAR OF 50-60KT SUPERCELLS
ARE EXPECTED AS STORMS DEVELOP E.  WHILE PRIMARY THREAT WILL BE VERY
LARGE HAIL/DAMAGING WINDS WITH MARGINAL LOW LEVEL SHEAR...THE
INSTABILITY SUPPORTS A TORNADO THREAT...PARTICULARLY EWD TOWARD THE
I-35 CORRIDOR DURING THE EVENING.

AVIATION...TORNADOES AND 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
550. MEAN STORM MOTION VECTOR 26035.


...HALES

Tornado Watches in Texas, 2007Every tornado watch in 2007

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.