Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2002
Severe Thunderstorm Warning 246, NWS Tulsa, OK
NWS Tulsa, OK issued this severe thunderstorm warning at Aug 13, 2002, 9:54 AM CDT for Adair County, Oklahoma. It was in force for 51 min. 1 report 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, 9:54 AM CDT (14:54 UTC)
- Expired
- Aug 13, 2002, 10:45 AM CDT
- In force
- 51 min
- Issued by
- NWS Tulsa, OK
- Area
- Counties, with a storm outline in the text
County Adair County, OK
The radar
The Tulsa radar (KINX), 80 km from the middle of the area, began a volume at 14:56 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, 10:00 AM CDT | Thunderstorm Wind 61 E | Proctor, OK | Thunderstorm winds estimated at 70 miles an hour blew down trees. |
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 nearest sounding before it
Springfield, MO (KSGF), launched 12:00Z, 2.9 hours before the alert went out and 128 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
- 1534 J/kg
- Mixed-layer CIN
- -78 J/kg
- Mixed-layer LCL
- 734 m above ground
- 0-6 km bulk shear
- 17 kt
- 0-1 km storm-relative helicity
- 203 m²/s²
- 0-3 km storm-relative helicity
- 228 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
142 WUUS54 KTSA 131454 SVRTUL OKC001-131545- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE TULSA OK 954 AM CDT TUE AUG 13 2002 THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... ADAIR COUNTY IN NORTHEAST OKLAHOMA * UNTIL 1045 AM CDT * AT 954 AM CDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 2 MILES EAST OF PROCTOR...MOVING EAST AT 15 MPH. * SOME LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE...BARON... CHRISTIE...PROCTOR...WESTVILLE AND WATTS. HAIL TO THE SIZE OF DIMES AND WIND GUSTS TO 60 MPH CAN BE EXPECTED IN THE WARNED AREA. STAY INDOORS AND AWAY FROM WINDOWS UNTIL THE STORM HAS PASSED. BE ALERT FOR RAPIDLY CHANGING WEATHER CONDITIONS AS STORMS APPROACH. LAT...LON 3609 9481 3586 9481 3587 9450 3612 9455
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 13, 3:25 AM CDT, 6 hours 29 minutes earlier.
Area forecast discussion, Aug 13, 3:25 AM CDT, 6 hours 29 minutes before
EASTERN OKLAHOMA/NORTHWEST ARKANSAS FORECAST DISCUSSION NATIONAL WEATHER SERVICE TULSA OKLAHOMA 325 AM CDT TUE AUG 13 2002 ...RETRANSMISSION COLD-POOL DRIVEN MCS MOVED INTO NE OK MUCH QUICKER THAN ANY OF THE NUMERICAL MODELS (AND THIS FORECASTER) HAD ANTICIPATED. NRN END CONTINUES TO SLOWLY WEAKEN OVER NE OK WITH GUST FRONT CURRENTLY MOVING INTO TULSA...WHILE LOW-LEVEL JET IS MAINTAINING STRONG STORMS ALG ITS SRN EDGE IN CNTRL OK. SYNOPTIC COLD FRONT IS STILL WELL N OF THE FORECAST AREA...STRETCHING FROM SRN IA-SCNTRL KS-TX PANHANDLE AT 08Z. HAVE NOTED AN INCREASE IN POST-FRONTAL CONVECTION OVER KS DURING THE PAST FEW HOURS...IN RESPONSE TO SHARP MID-LEVEL TROF/LARGE SCALE UVV. EXPECT INITIAL MCS TO CONTINUE TO WEAKEN THIS MORNING...LEAVING A PRONOUNCED SFC BOUNDARY ACROSS THE FORECAST AREA. EVOLUTION OF ANY CONVECTIVE REDEVELOPMENT IS REALLY IN QUESTION...BUT CONDITIONS REMAIN FAVORABE WITH CONVERGENCE ALONG SYNOPTIC/MESOSCALE BOUNDARIES AND IMPRESSIVE LIFT AIDED BY RIGHT ENTRANCE REGION OF H25 JET. WONT GET TOO FANCY WITH POPS TODAY...AND WILL GENERALLY BROADBRUSH LIKELY POPS FOR MOST OF THE AREA. WILL HAVE SOME LINGERING PRECIP OVER SE OK/WRN AR MAINLY THIS EVENING...OTHERWISE DRIER AND MORE STABLE AIR WILL FILTER ACROSS THE SRN PLAINS. WEDNESDAY SHAPING UP TO BE A PLEASANT AUGUST DAY...WITH BELOW AVERAGE TEMPS AND RELATIVE HUMIDITIES. WARM-UP WILL COMMENCE BY THU AND CONTINUE INTO THE WEEKEND. LITTLE IF ANY CHANGES MADE TO FORECAST PACKAGE BEYOND THURSDAY. PRELIM NUMBERS... TUL 80 62 87 65 / 70 20 10 10 FSM 88 65 88 66 / 70 40 10 10 MLC 87 66 88 66 / 70 40 10 10 BVO 80 60 87 63 / 70 20 10 10 FYV 81 61 84 58 / 70 40 10 10 BYV 79 59 82 62 / 70 40 10 10 MIO 78 59 84 63 / 70 20 10 10 MKO 83 63 87 66 / 70 20 10 10 F10 83 64 88 66 / 70 20 10 10 HHW 89 68 89 70 / 70 50 20 10 FORECAST ID = 18 .TSA... AR...NONE. OK...NONE.
In the hours before
Special weather statement, Aug 13, 4:25 AM CDT, 5 hours 29 minutes before
OKZ054>067-131000- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE TULSA OK 425 AM CDT TUE AUG 13 2002 SEVERE THUNDERSTORM WATCH 601 THAT WAS IN EFFECT FOR...OSAGE... WASHINGTON...NOWATA...OTTAWA...CRAIG...DELAWARE...ROGERS...PAWNEE... MAYES...TULSA...CREEK...WAGONER...OKMULGEE AND OKFUSKEE COUNTIES... HAS BEEN CANCELLED. THUNDERSTORMS CONTINUE TO WEAKEN EARLY THIS MORNING ACROSS NORTHEAST OKLAHOMA. LOCALLY HEAVY RAINFALL WILL OCCUR AND A FEW GUSTS TO 40 MPH ARE POSSIBLE...BUT THE THREAT OF SEVERE WEATHER HAS DIMINISHED.
Special weather statement, Aug 13, 6:00 AM CDT, 3 hours 54 minutes before
ARZ001-002-010-011-019-020-029-OKZ049-053>076-141200- EASTERN OKLAHOMA / NORTHWEST ARKANSAS HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE TULSA OK 600 AM CDT TUE AUG 13 2002 ...SEVERE THUNDERSTORMS POSSIBLE ACROSS EASTERN OKLAHOMA AND NORTHWEST ARKANSAS TODAY... A WEAKENING LINE OF THUNDERSTORMS WILL CONTINUE TO PUSH ACROSS EASTERN OKLAHOMA THIS MORNING...LEAVING AN OUTFLOW BOUNDARY OVER THE AREA. ADDITIONAL STORMS WILL MOVE OUT OF SOUTHERN KANSAS LATER THIS MORNING AS A COLD FRONT CONTINUES TO PUSH SOUTH ACROSS THE AREA. THE INTERACTION OF THE FRONT AND OUTFLOW BOUNDARIES FROM OVERNIGHT CONVECTION WILL PROVIDE FOCUS FOR ADDITIONAL STORMS TO DEVELOP TODAY. INCREASING WIND SHEAR ASSOCIATED WITH AN UPPER LEVEL DISTURBANCE MOVING ACROSS THE CENTRAL PLAINS WILL CAUSE SOME STORMS TO BE SEVERE...ESPECIALLY ACROSS SOUTHEAST OKLAHOMA AND NORTHWEST ARKANSAS WHERE SURFACE HEATING WILL RAPIDLY DESTABILIZE THE ATMOSPHERE. .SPOTTER ACTIVATION... SPOTTER ACTIVATION MAY BE NEEDED IN EASTERN OKLAHOMA AND NORTHWEST ARKANSAS TODAY...ESPECIALLY SOUTH OF OF INTERSTATE 44 THIS AFTERNOON. .DISCUSSION... AN UNSEASONABLY STRONG COLD FONT PUSHING ACROSS OKLAHOMA AND ARKANSAS TODAY WILL INTERACT WITH OUTFLOW BOUNDARIES ASSOCIATED WITH OVERNIGHT CONVECTION. SURFACE-BASED CAPE VALUES UP TO 2500 J/KG WILL DEVELOP MAINLY TO THE SOUTH OF THE INTERSTATE 44 CORRIDOR BY THIS AFTERNOON WHERE SURFACE DEW POINTS REMAIN IN THE LOWER 70S. ADDITIONAL LIFT WILL BE PROVIDED AS THIS AREA ALSO FALLS UNDER THE RIGHT EXIT REGION OF A 70 KT SOUTHWESTERLY JET STREAK AHEAD OF A SHARP UPPER TROUGH MOVING THROUGH THE CENTRAL PLAINS. THE MAIN SEVERE THREAT WILL ONCE AGAIN BE DAMAGING WINDS AS STORMS SHOULD EVOLVE INTO A LINE THIS AFTERNOON. RISK TABLE VALID THROUGH 1200 UTC TUESDAY AREA 1... PROBABILITY...100 SEVERE PROBABILITY IF STORMS OCCUR...40 SIGNIFICANT SEVERE PROBABILITY IF STORMS OCCUR...10 RISK AREAS DEFINE THE GREATEST RISK. PROBABILITIES ARE IN PERCENT. SIGNIFICANT SEVERE WEATHER IS DEFINED AS F1 OR GREATER WIND/TORNADO DAMAGE AND/OR GOLFBALL SIZE OR LARGER HAIL. 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, 12:33 AM CDT | Severe Thunderstorm Warning | TSA | Osage, Pawnee | 57 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.