Tornado Watch 87

Issued

Mar 19, 2012, 6:21 PM CDT (23:21 UTC)

Expired

Mar 20, 2012, 12:53 AM CDT

In force

7 hr

Issued by

the Storm Prediction Center

Largest hail expected

3 in

Strongest gust expected

70 kt

The Laughlin AFB radar (KDFX), 136 km from the middle of the area, began a volume at 23:25 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

70%

One or more EF2 to EF5 tornadoes

50%

Ten or more severe wind reports

80%

One or more gusts of 65 knots or more

50%

Ten or more severe hail reports

80%

One or more hailstones of 2 inches or more

80%

Six or more combined severe hail and wind reports

95%

• Mesoscale Discussion 294Mar 19, 6:05 PM CDT
• Mesoscale Discussion 297Mar 19, 8:22 PM CDT
• Mesoscale Discussion 299Mar 19, 9:46 PM CDT
• Mesoscale Discussion 301Mar 19, 11:53 PM CDT

020 
WWUS20 KWNS 192321
SEL7
SPC WW 192321
TXZ000-200600-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 87
NWS STORM PREDICTION CENTER NORMAN OK
625 PM CDT MON MAR 19 2012

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

       SOUTH CENTRAL TEXAS

EFFECTIVE THIS MONDAY NIGHT AND TUESDAY MORNING FROM 625 PM UNTIL
100 AM CDT.

TORNADOES...HAIL TO 3 INCHES IN DIAMETER...THUNDERSTORM WIND
GUSTS TO 80 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
AREAS.

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 60 STATUTE
MILES EAST AND WEST OF A LINE FROM 25 MILES WEST SOUTHWEST OF
LAREDO TEXAS TO 25 MILES NORTHEAST OF AUSTIN TEXAS.  FOR A
COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
UPDATE (WOUS64 KWNS WOU7).

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 85...WW 86...

DISCUSSION...SEVERAL DISCRETE SUPERCELLS HAVE FORMED TO THE WEST AND
SOUTHWEST OF SAN ANTONIO...AND APPEAR LIKELY TO MAINTAIN INTENSITY
THROUGH MUCH OF THE EVENING.  A MOIST AND VERY UNSTABLE AIR
MASS...COUPLED WITH STRONG LOW LEVEL AND DEEP LAYER SHEAR...WILL
PROMOTE THE RISK OF TORNADIC SUPERCELLS ALSO CAPABLE OF DAMAGING
WINDS AND VERY LARGE HAIL.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 3 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 70 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
550. MEAN STORM MOTION VECTOR 24030.


...HART

Tornado Watches in Texas, 2012Every tornado 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.