Alert archive / Oklahoma / Tornado Watches in 1997

Tornado Watch 320

May 25, 199751 counties in Oklahoma; 19 counties in Texas

The Storm Prediction Center issued this tornado watch at May 25, 1997, 8:00 PM CDT for 51 counties in Oklahoma; 19 counties in Texas. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
May 25, 1997, 8:00 PM CDT (01:00 UTC)
Expired
May 26, 1997, 1:00 AM CDT
In force
5 hr
Issued by
the Storm Prediction Center
All 70 counties

Atoka County, OK, Bryan County, OK, Canadian County, OK, Carter County, OK, Cherokee County, OK, Choctaw County, OK, Cleveland County, OK, Coal County, OK, Cotton County, OK, Craig County, OK, Creek County, OK, Delaware County, OK, Garfield County, OK, Garvin County, OK, Grady County, OK, Grant County, OK, Haskell County, OK, Hughes County, OK, Jefferson County, OK, Johnston County, OK, Kay County, OK, Kingfisher County, OK, Latimer County, OK, Lincoln County, OK, Logan County, OK, Love County, OK, Marshall County, OK, Mayes County, OK, McClain County, OK, McIntosh County, OK, Murray County, OK, Muskogee County, OK, Noble County, OK, Nowata County, OK, Okfuskee County, OK, Oklahoma County, OK, Okmulgee County, OK, Osage County, OK, Ottawa County, OK, Pawnee County, OK, Payne County, OK, Pittsburg County, OK, Pontotoc County, OK, Pottawatomie County, OK, Pushmataha County, OK, Rogers County, OK, Seminole County, OK, Stephens County, OK, Tulsa County, OK, Wagoner County, OK, Washington County, OK, Clay County, TX, Collin County, TX, Cooke County, TX, Dallas County, TX, Delta County, TX, Denton County, TX, Fannin County, TX, Grayson County, TX, Hopkins County, TX, Hunt County, TX, Jack County, TX, Lamar County, TX, Montague County, TX, Palo Pinto County, TX, Parker County, TX, Rains County, TX, Rockwall County, TX, Tarrant County, TX, Wise County, TX

The radar

The Norman radar (KTLX), 109 km from the middle of the area, began a volume at 01:00 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.

Warnings issued inside it

29 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

IssuedProductOfficeCountiesLasted
May 25, 8:05 PM CDTTornado WarningOUNCoal, Johnston, Pontotoc55 min
May 25, 8:15 PM CDTTornado WarningFWDCooke60 min
May 25, 8:17 PM CDTTornado WarningFWDMontague28 min
May 25, 8:30 PM CDTFlash Flood WarningFWDCooke3 hr
May 25, 8:36 PM CDTTornado WarningOUNJohnston, Marshall39 min
May 25, 8:45 PM CDTTornado WarningFWDMontague15 min
May 25, 8:46 PM CDTSevere Thunderstorm WarningOUNCarter44 min
May 25, 8:59 PM CDTTornado WarningOUNAtoka, Johnston31 min
May 25, 9:07 PM CDTTornado WarningOUNKay38 min
May 25, 9:11 PM CDTTornado WarningFWDGrayson64 min
May 25, 9:14 PM CDTTornado WarningFWDCooke61 min
May 25, 9:15 PM CDTTornado WarningOUNBryan, Marshall45 min
May 25, 9:25 PM CDTTornado WarningOUNAtoka, Pushmataha35 min
May 25, 9:39 PM CDTTornado WarningOUNKay51 min
May 25, 9:57 PM CDTTornado WarningOUNAtoka48 min
May 25, 10:00 PM CDTTornado WarningOUNBryan45 min
May 25, 10:11 PM CDTTornado WarningFWDCooke64 min
May 25, 10:14 PM CDTSevere Thunderstorm WarningTSAOsage61 min
May 25, 10:16 PM CDTSevere Thunderstorm WarningFWDGrayson44 min
May 25, 10:23 PM CDTSevere Thunderstorm WarningTSAOsage52 min
May 25, 10:26 PM CDTTornado WarningOUNKay44 min
May 25, 10:29 PM CDTSevere Thunderstorm WarningFWDFannin61 min
May 25, 10:38 PM CDTTornado WarningFWDGrayson37 min
May 25, 10:40 PM CDTTornado WarningTSAOsage35 min
May 25, 10:45 PM CDTTornado WarningOUNAtoka, Pushmataha45 min
May 25, 10:48 PM CDTTornado WarningFWDCollin42 min
May 25, 11:30 PM CDTTornado WarningOUNChoctaw, Pushmataha45 min
May 25, 11:59 PM CDTSevere Thunderstorm WarningTSANowata31 min
May 26, 12:32 AM CDTSevere Thunderstorm WarningTSACraig, Ottawa43 min

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 1.0 hours before the alert went out and 99 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Norman, OK at 00:00Z on 1997-05-26Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 360 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Norman, OK at 00:00Z on 1997-05-26The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 82 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
360 J/kg
Mixed-layer CIN
-169 J/kg
Mixed-layer LCL
1368 m above ground
0-6 km bulk shear
56 kt
0-1 km storm-relative helicity
82 m²/s²
0-3 km storm-relative helicity
124 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.4

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

953 
WWUS9 KMKC 260027
SEL0  
MKC WW 260027
OKZ000-TXZ000-260600-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 320
STORM PREDICTION CENTER NORMAN OK
727 PM CDT SUN MAY 25 1997

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

   CENTRAL AND EASTERN OKLAHOMA                           
   NORTH CENTRAL AND NORTHEAST TEXAS                              

EFFECTIVE THIS SUNDAY NIGHT AND MONDAY MORNING FROM 800 PM UNTIL
100 AM CDT.

TORNADOES...HAIL TO 2 3/4 INCHES IN DIAMETER...THUNDERSTORM WIND
GUSTS TO 80 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
AREAS.

THE TORNADO WATCH AREA IS ALONG AND 95 STATUTE MILES EAST AND WEST
OF A LINE FROM 20 MILES SOUTHEAST OF FORT WORTH TEXAS TO 20 MILES
NORTHWEST OF BARTLESVILLE 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 TORNADO WATCH
NUMBER 318.  WATCH NUMBER 318 WILL NOT BE IN EFFECT AFTER 800 PM
CDT.  CONTINUE...WW 319...

DISCUSSION...CLUSTERS OF SUPERCELL THUNDERSTORMS CONTINUE TO
PROPAGATE EASTWARD AND SOUTHEASTWARD ACROSS SOUTH CENTRAL OKLAHOMA
AND NORTH CENTRAL TEXAS.  POTENTIAL EXISTS FOR ADDITIONAL
DEVELOPMENT ALONG DRY LINE OVER CENTRAL OKLAHOMA WHERE LOW LEVEL
CONVERGENCE PERSISTS.  STRONG WESTERLY MID AND UPPER LEVEL WINDS
ARE EXPECTED TO REMAIN ACROSS OKLAHOMA...WHILE SOUTHERLY LOW LEVEL
JET IS FORECAST TO INCREASE OVER EASTERN OKLAHOMA TONIGHT.  THREAT
FOR LARGE HAIL AND TORNADOES EXPECTED TO CONTINUE INTO THE EARLY
MORNING HOURS.

ADDITIONAL WATCHES...NEW WATCH MAY BE NEEDED SOON ACROSS CENTRAL
AND EASTERN KANSAS SOON.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 2 3/4 INCHES.  EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 70 KNOTS.  A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
550.  MEAN STORM MOTION VECTOR 27025.


...WEISS

323,0984 365,0975 365,0943 323,0952

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 26, 6:00 PM CDTTornado WatchSPCAdair, Cherokee, Craig, Creek, Delaware, Haskell and 24 more6 hr

Nearby

Tornado Watches in Oklahoma, 1997Tornado Watches in Texas, 1997Every tornado watch in 1997

Sources

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.