Tornado Watch 170

Issued

Apr 22, 2001, 1:00 PM CDT (18:00 UTC)

Expired

Apr 22, 2001, 7:00 PM CDT

In force

6 hr

Issued by

the Storm Prediction Center

The Norman radar (KTLX), 74 km from the middle of the area, began a volume at 18:00 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 
WWUS9 KMKC 221757
SEL0  

SEL0  
MKC WW 221746
OKZ000-TXZ000-230000-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 170
STORM PREDICTION CENTER NORMAN OK
1246 PM CDT SUN APR 22 2001

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

   OKLAHOMA                           
   NORTH TEXAS                              

EFFECTIVE THIS SUNDAY AFTERNOON AND EVENING FROM 100 PM UNTIL 700
PM CDT.

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 ALONG AND 90 STATUTE MILES EAST AND WEST
OF A LINE FROM 50 MILES SOUTHEAST OF WICHITA FALLS TEXAS TO 20
MILES NORTH OF PONCA CITY 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.

OTHER WATCH INFORMATION...THIS TORNADO WATCH REPLACES SEVERE
THUNDERSTORM WATCH NUMBER 168.  WATCH NUMBER 168 WILL NOT BE IN
EFFECT AFTER 100 PM CDT.  CONTINUE...WW 169...

DISCUSSION...THUNDERSTORMS DEVELOPING ALONG MERGING COLD FRONT/DRY
LINE EXPECTED TO SLOWLY INCREASE IN COVERAGE/INTENSITY THIS 
AFTERNOON IN ZONE OF STRONG DEEP LAYER SHEAR OVER OK/N TX. 
LINEAR/DEEP LAYER FORCING FOR DEVELOPMENT WILL LIKELY FAVOR BROKEN
SQUALL LINE MODE WITH EMBEDDED SUPERCELLS/ISOLATED TORNADOES OVER 
CNTRL/NRN OK.  FARTHER S...GREAT SURFACE HEATING AND PERHAPS
ENHANCED UPPER LEVEL DIFFLUENCE MAY COMPENSATE FOR WEAKER LARGE
SCALE ASCENT TO SUPPORT MORE ISOLATED STORMS OVER SRN OK/N TX.    
 
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 500. 
MEAN STORM MOTION VECTOR 22045.

...CORFIDI

;370,0952 332,0961 332,0992 370,0984;

Tornado Watches in Oklahoma, 2001Tornado Watches in Texas, 2001Every tornado watch in 2001

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.