Severe Thunderstorm Watch 23

Issued

Feb 2, 2012, 7:38 PM CST (01:38 UTC)

Expired

Feb 3, 2012, 3:00 AM CST

In force

7 hr

Issued by

the Storm Prediction Center

Largest hail expected

1.5 in

Strongest gust expected

60 kt

The Amarillo radar (KAMA), 86 km from the middle of the area, began a volume at 01:41 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

10%

One or more gusts of 65 knots or more

10%

Ten or more severe hail reports

30%

One or more hailstones of 2 inches or more

20%

Six or more combined severe hail and wind reports

70%

• Mesoscale Discussion 91Feb 2, 3:44 PM CST
• Mesoscale Discussion 93Feb 2, 7:08 PM CST
• Mesoscale Discussion 94Feb 2, 9:48 PM CST
• Mesoscale Discussion 95Feb 2, 11:44 PM CST
• Mesoscale Discussion 96Feb 3, 2:00 AM CST

341 
WWUS20 KWNS 030142
SEL3
SPC WW 030142
OKZ000-TXZ000-030900-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 23
NWS STORM PREDICTION CENTER NORMAN OK
740 PM CST THU FEB 2 2012

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

       WESTERN OKLAHOMA
       NORTHWEST TEXAS AND THE PANHANDLE

EFFECTIVE THIS THURSDAY NIGHT AND FRIDAY MORNING FROM 740 PM
UNTIL 300 AM CST.

HAIL TO 1.5 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 85
STATUTE MILES EAST AND WEST OF A LINE FROM 45 MILES SOUTH
SOUTHWEST OF CHILDRESS TEXAS TO 45 MILES WEST NORTHWEST OF GAGE
OKLAHOMA.  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.

DISCUSSION...ELEVATED TSTMS ARE EXPECTED TO INCREASE IN AREAL
COVERAGE AND INTENSITY TONIGHT WITHIN STRENGTHENING LOW-LEVEL WAA
REGIME ATTENDANT TO 40-50+ KT LLJ.  WHILE THE AMBIENT AIR MASS IS
NOT OVERLY MOIST...THE COMBINATION OF STEEP MIDLEVEL LAPSE
RATES...COOL THERMODYNAMIC PROFILES AND STRONG VERTICAL SHEAR WILL
SUPPORT SUPERCELLS CAPABLE OF MAINLY SEVERE HAIL.

THE POTENTIAL FOR A TORNADO OR TWO MAY INCREASE LATER TONIGHT ACROSS
PARTS OF NWRN TX AND SWRN OK WHERE THE BOUNDARY LAYER MAY MOISTEN
SUFFICIENTLY TO SUPPORT STORMS ROOTED IN THE BOUNDARY LAYER.  AS
SUCH...CONDITIONS WILL CONTINUE TO BE MONITORED FOR A POSSIBLE
UPGRADE TO A TORNADO WATCH.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 350. MEAN STORM
MOTION VECTOR 23035.


...MEAD

Severe Thunderstorm Watches in Texas, 2012Severe Thunderstorm Watches in Oklahoma, 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.