Tornado Watch 132

Issued

Apr 20, 2002, 5:15 PM CDT (22:15 UTC)

Expired

Apr 20, 2002, 11:00 PM CDT

In force

6 hr

Issued by

the Storm Prediction Center

The Norman radar (KTLX), 47 km from the middle of the area, began a volume at 22:18 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.

000 
WWUS20 KWNS 202209
SEL2  
SPC WW 202204
OKZ000-TXZ000-210400-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 132
STORM PREDICTION CENTER NORMAN OK
504 PM CDT SAT APR 20 2002

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

CENTRAL AND NORTHEAST OKLAHOMA                           
EXTREME NORTHWEST TEXAS                              

EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 515 PM UNTIL
1100 PM CDT.

TORNADOES...HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS
TO 80 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE TORNADO WATCH AREA IS ALONG AND 60 STATUTE MILES NORTH AND
SOUTH OF A LINE FROM 45 MILES WEST SOUTHWEST OF FORT SILL OKLAHOMA
TO 5 MILES EAST SOUTHEAST OF TULSA OKLAHOMA.

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...THUNDERSTORMS ARE BEGINNING TO DEVELOP ALONG THE
SURFACE FRONT IN THE AREA NEAR AND SW OF OKC.  OBSERVATIONS AND
MODEL SOUNDINGS SUGGEST THAT INSTABILITY IS NOT PARTICULARLY LARGE
ALONG AND S OF THE BOUNDARY...BUT LOW-LEVEL AND DEEP LAYER SHEAR
WILL BECOME QUITE STRONG THIS EVENING ACROSS THE WATCH AREA. 
EXPECT SOME OF THE CONVECTION NOW DEVELOPING TO BECOME SEVERE LATER
THIS EVENING...WITH THE POTENTIAL FOR TORNADOES...LARGE HAIL...AND
DAMAGING WINDS.  THERE WILL ALSO BE THE POTENTIAL FOR AN ISOLATED
STRONG TORNADO.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 2 INCHES.  EXTREME TURBULENCE AND SURFACE WIND
GUSTS TO 70 KNOTS.  A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. 
MEAN STORM MOTION VECTOR 24035.


...THOMPSON

351,0954 333,0990 351,0990 370,0954

WWUS20 KWNS 202209
SEL2  
SPC WW 202204
OKZ000-TXZ000-210400-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 132
STORM PREDICTION CENTER NORMAN OK
504 PM CDT SAT APR 20 2002

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

CENTRAL AND NORTHEAST OKLAHOMA                           
EXTREME NORTHWEST TEXAS                              

EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 515 PM UNTIL
1100 PM CDT.

TORNADOES...HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS
TO 80 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE TORNADO WATCH AREA IS ALONG AND 60 STATUTE MILES NORTH AND
SOUTH OF A LINE FROM 45 MILES WEST SOUTHWEST OF FORT SILL OKLAHOMA
TO 5 MILES EAST SOUTHEAST OF TULSA OKLAHOMA.

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...THUNDERSTORMS ARE BEGINNING TO DEVELOP ALONG THE
SURFACE FRONT IN THE AREA NEAR AND SW OF OKC.  OBSERVATIONS AND
MODEL SOUNDINGS SUGGEST THAT INSTABILITY IS NOT PARTICULARLY LARGE
ALONG AND S OF THE BOUNDARY...BUT LOW-LEVEL AND DEEP LAYER SHEAR
WILL BECOME QUITE STRONG THIS EVENING ACROSS THE WATCH AREA. 
EXPECT SOME OF THE CONVECTION NOW DEVELOPING TO BECOME SEVERE LATER
THIS EVENING...WITH THE POTENTIAL FOR TORNADOES...LARGE HAIL...AND
DAMAGING WINDS.  THERE WILL ALSO BE THE POTENTIAL FOR AN ISOLATED
STRONG TORNADO.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 2 INCHES.  EXTREME TURBULENCE AND SURFACE WIND
GUSTS TO 70 KNOTS.  A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. 
MEAN STORM MOTION VECTOR 24035.


...THOMPSON

351,0954 333,0990 351,0990 370,0954

Tornado Watches in Oklahoma, 2002Tornado Watches in Texas, 2002Every tornado watch in 2002

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.