Tornado Watch 109

Issued

Apr 23, 2004, 12:15 PM CDT (17:15 UTC)

Expired

Apr 23, 2004, 6:00 PM CDT

In force

6 hr

Issued by

the Storm Prediction Center

• Mesoscale Discussion 445Apr 23, 10:10 AM CDT
• Mesoscale Discussion 450Apr 23, 1:46 PM CDT
• Mesoscale Discussion 451Apr 23, 2:41 PM CDT
• Mesoscale Discussion 452Apr 23, 3:05 PM CDT
• Mesoscale Discussion 453Apr 23, 4:40 PM CDT

557 
WWUS20 KWNS 231717
SEL9  
SPC WW 231715
OKZ000-TXZ000-232300-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 109
NWS STORM PREDICTION CENTER NORMAN OK
1215 PM CDT FRI APR 23 2004

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

       SOUTHWEST AND SOUTH CENTRAL OKLAHOMA
       WEST CENTRAL AND NORTHWEST TEXAS

EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 1215 PM UNTIL 600
PM 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 ALONG AND 85 STATUTE MILES EAST AND WEST
OF A LINE FROM 30 MILES NORTH OF WICHITA FALLS TEXAS TO 35 MILES
SOUTH SOUTHEAST OF SAN ANGELO TEXAS.

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.

DISCUSSION...AIR MASS HAS DESTABILIZED THE PAST FEW HOURS WITH
SBCAPE AROUND 2500 J/KG.  SEVERE THUNDERSTORMS ARE EXPECTED TO
DEVELOP EAST OF SURFACE DRYLINE EXTENDING SWD THROUGH WEST TX DURING
THE NEXT HOUR OR SO.  FAVORABLE SHEAR PROFILES WITH HELICITY AROUND
250 M2/S2 SUPPORTS SUPERCELLS ACROSS THE AREA AS SURFACE LOW MOVES
FROM NW TX...AND NORTHEASTWARD ALONG QUASISTATIONARY BOUNDARY INTO
SOUTHWEST OK.

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
500. MEAN STORM MOTION VECTOR 23035.


...MCCARTHY

342,0970 305,0985 305,1014 342,0995

Tornado Watches in Texas, 2004Tornado Watches in Oklahoma, 2004Every tornado watch in 2004

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.