Alert archive / Oklahoma / Severe Thunderstorm Watches in 2002

Severe Thunderstorm Watch 264

May 9, 20025 counties in Arkansas; 16 counties in Oklahoma

The Storm Prediction Center issued this severe thunderstorm watch at May 9, 2002, 1:15 AM CDT for 5 counties in Arkansas; 16 counties in Oklahoma. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
May 9, 2002, 1:15 AM CDT (06:15 UTC)
Expired
May 9, 2002, 6:00 AM CDT
In force
5 hr
Issued by
the Storm Prediction Center
All 21 counties

Crawford County, AR, Franklin County, AR, Scott County, AR, Sebastian County, AR, Washington County, AR, Adair County, OK, Cherokee County, OK, Coal County, OK, Creek County, OK, Haskell County, OK, Hughes County, OK, Latimer County, OK, LeFlore County, OK, McIntosh County, OK, Muskogee County, OK, Okfuskee County, OK, Okmulgee County, OK, Pittsburg County, OK, Seminole County, OK, Sequoyah County, OK, Wagoner County, OK

The radar

The Tulsa radar (KINX), 86 km from the middle of the area, began a volume at 06:17 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

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

IssuedProductOfficeCountiesLasted
May 9, 1:30 AM CDTSevere Thunderstorm WarningTSAOkmulgee, Tulsa, Wagoner45 min
May 9, 2:09 AM CDTSevere Thunderstorm WarningTSAMcIntosh, Muskogee, Okmulgee, Wagoner51 min
May 9, 2:45 AM CDTSevere Thunderstorm WarningTSABenton, Washington45 min
May 9, 2:49 AM CDTTornado WarningTSAMuskogee41 min
May 9, 3:03 AM CDTTornado WarningTSASequoyah57 min
May 9, 3:05 AM CDTSevere Thunderstorm WarningTSAHaskell40 min
May 9, 3:23 AM CDTSevere Thunderstorm WarningTSALeFlore67 min
May 9, 3:35 AM CDTTornado WarningTSACrawford, Sebastian55 min
May 9, 4:05 AM CDTSevere Thunderstorm WarningLZKLogan, Scott55 min
May 9, 4:09 AM CDTSevere Thunderstorm WarningTSAFranklin66 min

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 6.3 hours before the alert went out and 173 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 2002-05-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3758 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 2002-05-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 232 square meters per square second.1939587897117Sfc1 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
3758 J/kg
Mixed-layer CIN
-7 J/kg
Mixed-layer LCL
901 m above ground
0-6 km bulk shear
58 kt
0-1 km storm-relative helicity
232 m²/s²
0-3 km storm-relative helicity
265 m²/s²
Significant tornado parameter
5.8
Supercell composite
21.5

Open this sounding in Storm Lab

The text

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

000 
WWUS20 KWNS 090602
SEL4  
SPC WW 090558
ARZ000-OKZ000-091100-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 264
STORM PREDICTION CENTER NORMAN OK
1258 AM CDT THU MAY 9 2002

THE STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

   WESTERN ARKANSAS                           
   EASTERN OKLAHOMA                           

EFFECTIVE THIS THURSDAY MORNING FROM 115 AM UNTIL 600 AM CDT.

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

THE SEVERE THUNDERSTORM WATCH AREA IS ALONG AND 55 STATUTE MILES
NORTH AND SOUTH OF A LINE FROM 55 MILES WEST NORTHWEST OF MCALESTER
OKLAHOMA TO 35 MILES EAST OF FORT SMITH ARKANSAS.

REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE
FAVORABLE FOR 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.  SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE
TORNADOES.

OTHER WATCH INFORMATION...THIS SEVERE THUNDERSTORM WATCH REPLACES
TORNADO WATCH NUMBER 261.  WATCH NUMBER 261 WILL NOT BE IN EFFECT
AFTER 115 AM CDT.  CONTINUE...WW 263...

DISCUSSION...STRONG OUTFLOW BOUNDARY/COLD FRONT WILL CONTINUE
SURGING SWD ACROSS ERN OK/WRN AR...INTO MODERATELY UNSTABLE AIR
MASS.  GIVEN THE STRONG INFLOW AND DEGREE OF INSTABILITY...A FEW
SEVERE THUNDERSTORMS PRODUCING HAIL AND/OR WIND DAMAGE WILL REMAIN
POSSIBLE OVERNIGHT.


AVIATION...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 500.  MEAN STORM MOTION
VECTOR 29040.


...EVANS

343,0934 342,0964 355,0964 360,0934

WWUS20 KWNS 090602
SEL4  
SPC WW 090558
ARZ000-OKZ000-091100-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 264
STORM PREDICTION CENTER NORMAN OK
1258 AM CDT THU MAY 9 2002

THE STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

   WESTERN ARKANSAS                           
   EASTERN OKLAHOMA                           

EFFECTIVE THIS THURSDAY MORNING FROM 115 AM UNTIL 600 AM CDT.

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

THE SEVERE THUNDERSTORM WATCH AREA IS ALONG AND 55 STATUTE MILES
NORTH AND SOUTH OF A LINE FROM 55 MILES WEST NORTHWEST OF MCALESTER
OKLAHOMA TO 35 MILES EAST OF FORT SMITH ARKANSAS.

REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE
FAVORABLE FOR 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.  SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE
TORNADOES.

OTHER WATCH INFORMATION...THIS SEVERE THUNDERSTORM WATCH REPLACES
TORNADO WATCH NUMBER 261.  WATCH NUMBER 261 WILL NOT BE IN EFFECT
AFTER 115 AM CDT.  CONTINUE...WW 263...

DISCUSSION...STRONG OUTFLOW BOUNDARY/COLD FRONT WILL CONTINUE
SURGING SWD ACROSS ERN OK/WRN AR...INTO MODERATELY UNSTABLE AIR
MASS.  GIVEN THE STRONG INFLOW AND DEGREE OF INSTABILITY...A FEW
SEVERE THUNDERSTORMS PRODUCING HAIL AND/OR WIND DAMAGE WILL REMAIN
POSSIBLE OVERNIGHT.


AVIATION...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 500.  MEAN STORM MOTION
VECTOR 29040.


...EVANS

343,0934 342,0964 355,0964 360,0934

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 9, 4:45 AM CDTSevere Thunderstorm WatchSPCArkansas, Conway, Desha, Faulkner, Garland, Grant and 12 more4 hr
May 8, 8:00 PM CDTSevere Thunderstorm WatchSPCOttawa6 hr
May 8, 9:00 PM CDTTornado WatchSPCAdair, Alfalfa, Blaine, Cherokee, Craig, Creek and 17 more5 hr

Nearby

Severe Thunderstorm Watches in Oklahoma, 2002Severe Thunderstorm Watches in Arkansas, 2002Every severe thunderstorm watch in 2002

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.