Tornado Watch 2

Issued

Jan 20, 2010, 3:52 PM CST (21:52 UTC)

Expired

Jan 20, 2010, 10:00 PM CST

In force

6 hr

Issued by

the Storm Prediction Center

Largest hail expected

2 in

Strongest gust expected

60 kt

The Dallas/Ft Worth radar (KFWS), 123 km from the middle of the area, began a volume at 21:52 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

10%

Ten or more severe wind reports

40%

One or more gusts of 65 knots or more

10%

Ten or more severe hail reports

50%

One or more hailstones of 2 inches or more

20%

Six or more combined severe hail and wind reports

70%

• Mesoscale Discussion 23Jan 20, 1:49 PM CST
• Mesoscale Discussion 27Jan 20, 6:42 PM CST
• Mesoscale Discussion 29Jan 20, 9:20 PM CST

745 
WWUS20 KWNS 202157
SEL2
SPC WW 202157
ARZ000-OKZ000-TXZ000-210400-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 2
NWS STORM PREDICTION CENTER NORMAN OK
355 PM CST WED JAN 20 2010

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

       EXTREME SOUTHWEST ARKANSAS
       SOUTH CENTRAL AND SOUTHEAST OKLAHOMA
       NORTH CENTRAL AND NORTHEAST TEXAS

EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 355 PM UNTIL
1000 PM CST.

TORNADOES...HAIL TO 2 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 80 STATUTE
MILES NORTH AND SOUTH OF A LINE FROM 40 MILES WEST NORTHWEST OF
FORT WORTH TEXAS TO 10 MILES SOUTH OF TEXARKANA ARKANSAS.  FOR A
COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
UPDATE (WOUS64 KWNS WOU2).

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 1...

DISCUSSION...THUNDERSTORMS ARE EXPECTED TO DEVELOP AND INTENSIFY
ACROSS PART OF NORTH CENTRAL TX/SOUTH CENTRAL OK ALONG WARM FRONT IN
RESPONSE TO INCREASING DYNAMIC FORCING FOR ASCENT ASSOCIATED WITH
STRONG UPPER TROUGH APPROACHING FROM THE WEST.  RELATIVELY STEEP
LAPSE RATES ABOVE MOIST PBL ARE CONTRIBUTING TO UNSTABLE ENVIRONMENT
WITH MLCAPE OF 1000-1500 J/KG. EFFECTIVE BULK SHEAR CURRENTLY IN THE
35-45 KT RANGE IS SUPPORTIVE OF SUPERCELL DEVELOPMENT...AND LOW LCL
HEIGHTS AND SUFFICIENT LOW LEVEL SHEAR/SRH WILL ENHANCE THREAT FOR A
FEW TORNADOES WITH DISCRETE CELLS THAT FORM.

AVIATION...TORNADOES AND 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
450. MEAN STORM MOTION VECTOR 25035.


...WEISS

Tornado Watches in Texas, 2010Tornado Watches in Oklahoma, 2010Tornado Watches in Arkansas, 2010Every tornado watch in 2010

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.