Tornado Watch 90

Issued

Mar 29, 2007, 5:44 PM CDT (22:44 UTC)

Expired

Mar 29, 2007, 11:49 PM CDT

In force

6 hr

Issued by

the Storm Prediction Center

Largest hail expected

1 in

Strongest gust expected

60 kt

The Norman radar (KTLX), 112 km from the middle of the area, began a volume at 22:44 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

10%

One or more gusts of 65 knots or more

10%

Ten or more severe hail reports

5%

One or more hailstones of 2 inches or more

5%

Six or more combined severe hail and wind reports

50%

• Mesoscale Discussion 371Mar 29, 3:50 PM CDT
• Mesoscale Discussion 373Mar 29, 7:32 PM CDT
• Mesoscale Discussion 374Mar 29, 10:01 PM CDT

000
WWUS20 KWNS 292250
SEL0  
SPC WW 292250
OKZ000-TXZ000-300600-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 90
NWS STORM PREDICTION CENTER NORMAN OK
545 PM CDT THU MAR 29 2007

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

       SOUTHERN AND EASTERN OKLAHOMA
       CENTRAL AND NORTHERN TEXAS

EFFECTIVE THIS THURSDAY AFTERNOON AND FRIDAY MORNING FROM 545 PM
UNTIL 100 AM CDT.

TORNADOES...HAIL TO 1 INCH IN DIAMETER...THUNDERSTORM WIND GUSTS
TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 55 STATUTE
MILES EAST AND WEST OF A LINE FROM 35 MILES WEST NORTHWEST OF
GROVE OKLAHOMA TO 40 MILES SOUTHWEST OF WACO TEXAS.  FOR A
COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
UPDATE (WOUS64 KWNS WOU0).

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...THIS TORNADO WATCH REPLACES SEVERE
THUNDERSTORM WATCH NUMBER 89. WATCH NUMBER 89 WILL NOT BE IN
EFFECT AFTER 545 PM CDT. 

DISCUSSION...POTENTIAL FOR ISOLATED TORNADOES WILL EXIST THIS
EVENING WITHIN COMPLEX...LARGER SCALE MCS EXTENDING FROM NEAR TPL
NNE TO NEAR BVO.  50-60 DEEP SSWLY SHEAR ACROSS REGION...COUPLED
WITH NEARLY SATURATED LOW LEVEL ENVIRONMENT...SUGGESTS THAT SETUP
WILL REMAIN FAVORABLE FOR THE DEVELOPMENT OF LARGER /MCV-SCALE/
CIRCULATIONS OR WEAK LOW PRESSURE AREAS THAT COULD CONTINUE TO
LOCALLY ENHANCE LOW-LEVEL CONVERGENCE/UPLIFT IN WEAKLY UNSTABLE
ENVIRONMENT.  RESULTING SEMI-DISCRETE STORMS COULD THEREFORE
MAINTAIN POTENTIAL FOR LOW- LEVEL ROTATION/ISOLATED TORNADOES
THROUGH LATE EVENING.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND
GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 450.
MEAN STORM MOTION VECTOR 22035.


...CORFIDI

Tornado Watches in Texas, 2007Tornado Watches in Oklahoma, 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.