Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2002
Severe Thunderstorm Warning 245, NWS Tulsa, OK
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
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 13, 12:45 AM CDT | Thunderstorm Wind 52 E | Grainola, OK | Thunderstorm winds estimated at 60 miles an hour blew down large tree limbs. |
| Aug 13, 12:55 AM CDT | Thunderstorm Wind 56 E | Marland, 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.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Aug 12, 11:40 PM CDT | Severe Thunderstorm Watch | SPC | 5 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.
- 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
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 9643What 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.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 13, 9:54 AM CDT | Severe Thunderstorm Warning | TSA | Adair | 51 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.