Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 245, NWS Tulsa, OK

August 13, 2002Osage County, Pawnee County, Oklahoma

NWS Tulsa, OK issued this severe thunderstorm warning at Aug 13, 2002, 12:33 AM CDT for Osage County, Pawnee County, Oklahoma. It was in force for 57 min. 2 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued
Aug 13, 2002, 12:33 AM CDT (05:33 UTC)
Expired
Aug 13, 2002, 1:30 AM CDT
In force
57 min
Issued by
NWS Tulsa, OK
Area
Counties, with a storm outline in the text

Counties Osage County, OK, Pawnee County, OK

The radar

The Vance AFB radar (KVNX), 108 km from the middle of the area, began a volume at 05:35 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.

What was reported inside it

TimeReportWhereRemark
Aug 13, 12:45 AM CDTThunderstorm Wind 52 EGrainola, OKThunderstorm winds estimated at 60 miles an hour blew down large tree limbs.
Aug 13, 12:55 AM CDTThunderstorm Wind 56 EMarland, OK

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

Did it verify

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Aug 12, 11:40 PM CDTSevere Thunderstorm WatchSPC5 hr

The nearest sounding before it

Lamont, OK (KLMN), launched 00:00Z, 5.6 hours before the alert went out and 52 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, Lamont, OK at 00:00Z on 2002-08-13Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3086 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, Lamont, OK at 00:00Z on 2002-08-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 50 square meters per square second.1939Sfc1 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
3086 J/kg
Mixed-layer CIN
-22 J/kg
Mixed-layer LCL
1535 m above ground
0-6 km bulk shear
34 kt
0-1 km storm-relative helicity
50 m²/s²
0-3 km storm-relative helicity
167 m²/s²
Significant tornado parameter
0.9
Supercell composite
13.3

Open this sounding in Storm Lab

The text

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

567 
WUUS54 KTSA 130533
SVRTUL
OKC113-117-130630-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TULSA OK
1233 AM CDT TUE AUG 13 2002

THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR
  OSAGE COUNTY IN NORTHEAST OKLAHOMA
  PAWNEE COUNTY IN NORTHEAST OKLAHOMA

* UNTIL 130 AM CDT

* AT 1233 AM CDT SEVERE THUNDERSTORMS CAPABLE OF PRODUCING WINDS     
  UP TO 80 MPH WERE LOCATED ALONG A LINE EXTENDING FROM 26 MILES     
  WEST OF GRAINOLA TO 21 MILES WEST OF BURBANK TO 32 MILES WEST OF   
  RALSTON...MOVING EAST AT 50 MPH.

* SOME LOCATIONS AFFECTED INCLUDE... SHIDLER...FAIRFAX...BURBANK...
  PEARSONIA...FORAKER...GRAINOLA...BLACKBURN...SKEDEE AND RALSTON.

DAMAGING WINDS ARE LIKELY WITH THESE STORMS...MOVE TO A SAFE PLACE 
NOW. MOBILE HOMES AND VEHICLES ARE ESPECIALLY SUSCEPTIBLE TO HIGH 
WINDS AND MAY BE OVERTURNED.

LAT...LON 3703 9721 3675 9719 3654 9745 3631 9654
          3653 9636 3694 9643

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Tulsa, OK wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 12, 9:25 PM CDT, 3 hours 8 minutes earlier.

Area forecast discussion, Aug 12, 9:25 PM CDT, 3 hours 8 minutes before
EASTERN OKLAHOMA/NORTHWEST ARKANSAS FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TULSA OKLAHOMA
925 PM CDT MON AUG 12 2002

UPDATED FORECAST WILL BE OUT SHORTLY.

COLD FRONT IS LOCATED FROM NORTH CENTRAL KANSAS SOUTHWEST INTO THE
SOUTHEAST CORNER OF COLORADO AND WILL NOT ENTER NORTHEAST OKLAHOMA
UNTIL TOMORROW.  DO NOT EXPECT ANY ACTIVITY IN OUR AREA THIS
EVENING...BUT COULD SEE SOME STORMS LATE TONIGHT.  AS PER GOING
FORECAST THE BEST CHANCE WILL BE TO THE NORTHWEST OF TULSA.  THE 18Z
ETA WAS SLOWER WITH THE RAIN TOMORROW AND HAS THE QPF ORIENTED MORE
NORTH TO SOUTH THAN EAST TO WEST.  IN ADDITION TO ADJUSTING POPS
SOME TONIGHT ALSO ADJUSTED THE POPS AND WEATHER FOR TOMORROW TO
REFLECT THIS NEW THINKING.   ALSO ADJUSTED FOR A LITTLE LESS CLOUD
COVER TONIGHT AND CLOUD COVER EVERYWHERE TOMORROW.  GOING TEMPS LOOK
REASONABLE AND DID NOT TOUCH THEM EXCEPT TO BRING THE EVENING GRIDS
INTO LINE WITH CURRENT READINGS.

DUE TO THE NEW THINKING AN UPDATED HAZARDOUS WEATHER OUTLOOK WILL BE
OUT SHORTLY AS WELL.

.TSA...
AR...NONE.
OK...NONE.

ABBAS

In the hours before

Special weather statement, Aug 12, 9:45 PM CDT, 2 hours 48 minutes before
ARZ001-002-010-011-019-020-029-OKZ049-053>076-131200-

EASTERN OKLAHOMA / NORTHWEST ARKANSAS HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE TULSA OK
945 PM CDT MON AUG 12 2002

...THUNDERSTORMS LIKELY ACROSS FAR NORTHEAST OKLAHOMA LATE TONIGHT...

...SEVERE THUNDERSTORMS LIKELY ACROSS EASTERN OKLAHOMA AND
   NORTHWEST ARKANSAS ON TUESDAY...

SCATTERED SHOWERS AND THUNDERSTORMS WILL LIKELY DEVELOP ACROSS
NORTHEAST OKLAHOMA LATE TONIGHT IN RESPONSE TO A STRENGTHENING LOW
LEVEL JET.  A FEW OF THESE STORMS COULD BE STRONG WITH...BRIEF HEAVY
RAIN...GUSTY WINDS AND SMALL HAIL...MAINLY NORTH OF THE INTERSTATE
44 CORRIDOR.

DAY TWO...
SHOWERS AND THUNDERSTORMS ARE LIKELY ACROSS ALL OF EASTERN OKLAHOMA
AND NORTHWEST ARKANSAS ON TUESDAY AS AN UNSEASONABLY STRONG COLD
FRONT PUSHES INTO THE AREA. THE THUNDERSTORMS ARE EXPECTED TO
DEVELOP INTO A SQUALL LINE LATE TONIGHT...MOVING INTO NORTHEAST
OKLAHOMA TUESDAY MORNING AND INTO NORTHWEST ARKANSAS DURING THE
AFTERNOON HOURS. A FEW OF THESE STORMS WILL LIKELY BE BE SEVERE WITH
DAMAGING WINDS AND LARGE HAIL. IN ADDITION HEAVY RAIN WILL ALSO BE
LIKELY WITH THESE STORMS...ESPECIALLY ACROSS FAR NORTHEAST
OKLAHOMA...WHERE WIDESPREAD ONE TO TWO INCH RAINFALL AMOUNTS ARE
EXPECTED.

.SPOTTER ACTIVATION...
SPOTTER ACTIVATION IS NOT ANTICIPATED THROUGH TONIGHT...HOWEVER
EMERGENCY MANAGEMENT PERSONNEL SHOULD CONTINUE TO MONITOR THE LATEST
FORECASTS. IF THE SQUALL LINE PROPAGATES EAST FASTER THAN CURRENTLY
ANTICIPATED...SEVERE STORMS COULD MOVE INTO NORTHEAST OKLAHOMA LATE
TONIGHT...PRIMARILY NORTH OF THE INTERSTATE 44 CORRIDOR.

.DISCUSSION...
STRONG TO SEVERE CONVECTION HAS DEVELOP ACROSS SOUTHWEST KANSAS THIS
EVENING. STILL UNCERTAINTIES CONCERNING THE SPEED/EVOLUTION OF THE
MCS THAT IS EXPECTED TO DEVELOP OVER NORTHWEST OKLAHOMA LATER
TONIGHT.  CURRENT RADAR TRENDS/PROFILER DATA SUGGEST ONGOING
CONVECTION MAY INITIALLY TRACK SOUTHWARD IN BETTER LOW LEVEL JET
AXIS.  MCS SHOULD BEGIN TO MAKE A MORE EASTWARD PUSH LATE
TONIGHT...MOVING INTO NORTHEAST OKLAHOMA AFTER DAYBREAK. STILL COULD
SEE SCATTERED ELEVATED STORMS AHEAD OF THE LINE AFTER MIDNIGHT...
PRIMARILY ACROSS NORTHEAST OKLAHOMA.

RELATED GRAPHICAL INFORMATION CAN BE FOUND AT...
WWW.SRH.NOAA.GOV/TULSA
Special weather statement, Aug 12, 11:40 PM CDT, 53 minutes before
ARZ001-002-010-011-019-020-029-OKZ049-053>076-131200-

EASTERN OKLAHOMA / NORTHWEST ARKANSAS HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE TULSA OK
1140 PM CDT MON AUG 12 2002

...UPDATED FOR SHORT TERM CONVECTIVE TRENDS...

LINE OF STRONG TO SEVERE THUNDERSTORMS CONTINUE TO DEVELOP ACROSS
SOUTH-CENTRAL KANSAS AND NORTH-CENTRAL OKLAHOMA...MOVING SOUTHEAST
AT 35 MPH.  THIS LINE WILL CONTINUE PUSHING SOUTHEAST INTO NORTHEAST
OKLAHOMA BETWEEN MIDNIGHT AND 100 AM.  DAMAGING DOWNBURST WINDS TO
70 MPH WILL BE POSSIBLE IN THE STRONGER BOW SEGMENTS.  RESIDENTS
ACROSS NORTHEAST OKLAHOMA SHOULD CONTINUE TO MONITOR WEATHER
CONDITIONS AS WARNINGS WILL LIKELY BE ISSUED.

.SPOTTER ACTIVATION...
SPOTTER ACTIVATION WILL BE REQUIRED ACROSS PORTIONS OF NORTHEAST
OKLAHOMA.

RELATED GRAPHICAL INFORMATION CAN BE FOUND AT...
WWW.SRH.NOAA.GOV/TULSA

The office that day

Everything else NWS Tulsa, OK issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 13, 9:54 AM CDTSevere Thunderstorm WarningTSAAdair51 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2002Every severe thunderstorm warning 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.