Alert archive / Oklahoma / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 2, NWS Tulsa, OK
NWS Tulsa, OK issued this severe thunderstorm warning at Jan 21, 1999, 4:12 PM CST for Pushmataha County, Oklahoma. It was in force for 33 min. 2 reports came from inside the area while it was in force.
The area
The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties, with what was reported inside it.
The facts
- Issued
- Jan 21, 1999, 4:12 PM CST (22:12 UTC)
- Expired
- Jan 21, 1999, 4:45 PM CST
- In force
- 33 min
- Issued by
- NWS Tulsa, OK
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
County Pushmataha County, OK
The radar
The Western Arkansas radar (KSRX), 135 km from the middle of the area, began a volume at 22:16 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 |
|---|---|---|---|
| Jan 21, 4:19 PM CST | Hail 1 | Clayton, OK | |
| Jan 21, 4:23 PM CST | Hail 1 | Stanley, 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.
The nearest sounding before it
Norman, OK (KOUN), launched 12:00Z, 10.2 hours before the alert went out and 189 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 2017 m above ground
- 0-6 km bulk shear
- 43 kt
- 0-1 km storm-relative helicity
- 13 m²/s²
- 0-3 km storm-relative helicity
- 126 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
999 WUUS54 KTSA 212214 RRA SVRTUL OKC127-212245- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE TULSA OK 412 PM CST THU JAN 21 1999 THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... PUSHMATAHA COUNTY IN SOUTHEAST OKLAHOMA * UNTIL 445 PM CST * AT 412 PM CST A SEVERE THUNDERSTORM WAS LOCATED 4 MILES SOUTHWEST OF DUNBAR...MOVING NORTHEAST AT 30 MPH. * SOME LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE... DUNBAR... KIAMICHI...TUSKAHOMA...STANLEY AND CLAYTON HAIL TO THE SIZE OF DIMES AND WIND GUSTS TO 60 MPH CAN BE EXPECTED IN THE WARNED AREA. LAT...LON 3445 9572 3432 9557 3462 9516 3478 9535
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 Jan 21, 10:45 AM CST, 5 hours 27 minutes earlier.
Area forecast discussion, Jan 21, 10:45 AM CST, 5 hours 27 minutes before
EASTERN OKLAHOMA/NORTHWEST ARKANSAS FORECAST DISCUSSION NATIONAL WEATHER SERVICE TULSA OK 1045 AM CST THU JAN 21 1999 BIG FOCUS THIS MORNING IS ON THUNDERSTORM CHANCES AND THE SPC HIGH RISK AREA IN ARKANSAS. 15Z SURFACE ANALYSIS SHOWS DEEP SURFACE LOW OVER OK THIS MORNING WITH FRONTAL BOUNDARY STRETCHING FROM OKC-SGF. A DRYLINE EXTENDS SOUTHWEST FROM NEAR ADM. REGIONAL UPPER AIR SOUNDINGS THIS MORNING ALL SHOWED A MODERATELY TO VERY UNSTABLE ATMOSPHERE WITH A WEAK CAP. BEST MOISTURE FLUX CONVERGENCE IS CURRENTLY LOCATED ALONG THE FRONTAL BOUNDARY THIS MORNING AND MAY SEE SOME TSRA DEVELOPMENT ALONG THE FRONT EARLY THIS AFTERNOON. HOWEVER...MOISTURE ON THE 12Z OUN SOUNDING WAS ONLY KNEE-DEEP...SO ZONES BETWEEN TUL-MLC WILL NOT LIKELY SEE TSRA DEVELOPMENT TODAY AS WIND PROFILERS SHOW WESTERLY WINDS AT 925 AND 850 MB OVER CENTRAL OK. BY LATE THIS AFTERNOON...LEFT EXIT REGION OF VIGOROUS UPPER SPEED MAX APPROACHES AND CAUSES DYNAMICAL LIFTING. ALSO...SECONDARY SURFACE LOW SHOWN OVER CO ON 15Z SFC ANALYSIS MOVES INTO OKLAHOMA AND STRENGTHENS...CAUSING A BETTER LOW-LEVEL FOCUS FOR TSRA DEVELOPMENT. IN ADDITION...THE FACT THAT THE LOW WILL BE STRENGTHENING WILL CAUSE A GREATER COMPONENT TO THE LOW-LEVEL CROSS-ISOBARIC FLOW AND INCREASE THE FAVORABILITY OF THE WIND PROFILES FOR SUPERCELL STORMS. BELIEVE THAT THUNDERSTORM INITIATION WILL TAKE PLACE OVER FAR ERN OK LATE THIS AFTN WITH THUNDERSTORMS QUICKLY BECOMING SEVERE. THUNDERSTORMS MAY ALSO DEVELOP OVER FAR SOUTHERN OK AS ACCAS CLOUDS FROM LBB-SPS NOW SHOWN ON VISIBLE SATELLITE IMAGES ON THE CYCLONIC SIDE OF THE UPPER JET MOVE EAST OF THE DRYLINE AND TAP INTO SURFACE-BASED INSTABILITY. FOR THE ZONES...THIS BOILS DOWN TO ADDING POPS EVERYWHERE EXCEPT AROUND MLC AND ADDING A MENTION OF SEVERE IN THE FAR EASTERN ZONES. WILL TAKE A LOOK AT TEMPS AND WINDS AT THE TIME OF UPDATE. FORECAST UPDATE SHOULD BE OUT BY 1100 AM. 22 .TUL... OK...NONE. AR...NONE.
In the hours before
Special weather statement, Jan 21, 1:00 PM CST, 3 hours 12 minutes before
ARZ001-002-010-011-019-020-029-OKZ049-053>076-221200- EASTERN OKLAHOMA/NORTHWEST ARKANSAS HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE TULSA OK 100 PM CST THU JAN 21 1999 A FEW SEVERE THUNDERSTORMS ARE POSSIBLE ACROSS NORTHWEST ARKANSAS AND FAR SOUTHEAST OKLAHOMA LATE THIS AFTERNOON AND EARLY TONIGHT...MAINLY EAST OF A GRAVETTE ARKANSAS TO HUGO OKLAHOMA LINE. A STRONG UPPER LEVEL SYSTEM WILL APPROACH OKLAHOMA AND ARKANSAS TONIGHT AND FRIDAY. IN ADVANCE OF THIS SYSTEM...UNSEASONABLY WARM AND HUMID AIR WILL CONTINUE TO ADVECT NORTHWARD INTO EASTERN OKLAHOMA AND NORTHWEST ARKANSAS. A STATIONARY FRONT WAS LOCATED EARLY THIS AFTERNOON FROM COFFEYVILLE KANSAS TO PAWNEE OKLAHOMA. A DRY LINE ALSO EXTENDED SOUTHWARD FROM THE STATIONARY FRONT FROM NEAR VINITA TO ARDMORE OKLAHOMA. THE STATIONARY FRONT IS EXPECTED TO MOVE A LITTLE SOUTH THIS AFTERNOON AND TONIGHT WHILE THE DRYLINE MOVES FAIRLY RAPIDLY EASTWARD THIS AFTERNOON...ESPECIALLY ACROSS SOUTHERN OKLAHOMA. THE STATIONARY FRONT AS WELL AS THE DRYLINE MAY PROVIDE ENOUGH LIFT FOR THUNDERSTORMS TO DEVELOP ACROSS THE AREA THIS AFTERNOON AND TONIGHT. THUNDERSTORMS WILL CONTINUE TO DEVELOP NORTH OF THE STATIONARY FRONT ACROSS SOUTHEAST KANSAS AND CENTRAL MISSOURI THIS AFTERNOON. THESE STORMS ARE EXPECTED TO REMAIN MOSTLY NORTH OF THE AREA THIS AFTERNOON...HOWEVER A FEW MAY BUILD SOUTHWESTWARD INTO NORTHEAST OKLAHOMA TONIGHT. IF THESE STORMS DEVELOP SOUTH...THEY WILL BE CAPABLE OF PRODUCING SOME HAIL AND LOCALLY GUSTY WINDS. RELATIVELY LOW INSTABILITY IN THIS AREA WILL LIKELY PREVENT THE DEVELOPMENT OF WIDESPREAD SEVERE THUNDERSTORMS. JUST AHEAD OF THE DRYLINE AND STATIONARY FRONT...THERE MAY BE ENOUGH LIFT FOR THUNDERSTORMS TO DEVELOP. THE AMOUNT OF LIFT IN THIS AREA IS MUCH WEAKER BUT DUE TO THE HIGHER AMOUNT OF INSTABILITY PRESENT ...ANY THUNDERSTORMS THAT DEVELOP IN THIS AREA WILL LIKLEY BECOME SEVERE WITH LARGE HAIL AND LOCALLY DAMAGING WINDS POSSIBLE. THE EXPECTED VERTICAL WIND PROFILE AND AMOUNT OF INSTABILITY IS SUFFICIENT FOR THE DEVELOPMENT OF SUPERCELL THUNDERSTORMS ACROSS AREAS GENERALLY EAST OF A GRAVETTE TO HUGO LINE THIS AFTERNOON AND EARLY TONIGHT. THE GREATEST THREAT OF TORNADOES AT THIS TIME APPEARS TO BE OVER AREAS FURTHER SOUTH AND EAST LATER TONIGHT...OVER CENTRAL AND SOUTHERN ARKANSAS AND MUCH OF LOUISIANA AND EXTREME EASTERN TEXAS. THE UPPER LEVEL SYSTEM WILL INTENSIFY AND MOVE EAST OF THE AREA EARLY FRIDAY...TAKING WITH IT ANY CHANCE OF SEVERE THUNDERSTORMS. RAIN MAY POSSIBLY CHANGE TO LIGHT SNOW BEFORE ENDING LATE FRIDAY NIGHT. THIS OUTLOOK IS INTENDED TO PROVIDE GUIDANCE TO EMERGENCY MANAGEMENT AGENCIES AND STORM SPOTTER GROUPS CONCERNING TORNADOES...SEVERE THUNDERSTORMS...HIGH WIND EVENTS...FLOODING AND WINTER WEATHER. INFORMATION CONCERNING OTHER HAZARDS CAN BE FOUND IN OTHER PRODUCTS ISSUED BY THE NATIONAL WEATHER SERVICE OFFICE IN TULSA.
Special weather statement, Jan 21, 1:00 PM CST, 3 hours 12 minutes before
ARZ001-002-010-011-019-020-029-OKZ049-053>076-221200- EASTERN OKLAHOMA/NORTHWEST ARKANSAS HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE TULSA OK 100 PM CST THU JAN 21 1999 A FEW SEVERE THUNDERSTORMS ARE POSSIBLE ACROSS NORTHWEST ARKANSAS AND FAR SOUTHEAST OKLAHOMA LATE THIS AFTERNOON AND EARLY TONIGHT...MAINLY EAST OF A GRAVETTE ARKANSAS TO HUGO OKLAHOMA LINE. A STRONG UPPER LEVEL SYSTEM WILL APPROACH OKLAHOMA AND ARKANSAS TONIGHT AND FRIDAY. IN ADVANCE OF THIS SYSTEM...UNSEASONABLY WARM AND HUMID AIR WILL CONTINUE TO ADVECT NORTHWARD INTO EASTERN OKLAHOMA AND NORTHWEST ARKANSAS. A STATIONARY FRONT WAS LOCATED EARLY THIS AFTERNOON FROM COFFEYVILLE KANSAS TO PAWNEE OKLAHOMA. A DRY LINE ALSO EXTENDED SOUTHWARD FROM THE STATIONARY FRONT FROM NEAR VINITA TO ARDMORE OKLAHOMA. THE STATIONARY FRONT IS EXPECTED TO MOVE A LITTLE SOUTH THIS AFTERNOON AND TONIGHT WHILE THE DRYLINE MOVES FAIRLY RAPIDLY EASTWARD THIS AFTERNOON...ESPECIALLY ACROSS SOUTHERN OKLAHOMA. THE STATIONARY FRONT AS WELL AS THE DRYLINE MAY PROVIDE ENOUGH LIFT FOR THUNDERSTORMS TO DEVELOP ACROSS THE AREA THIS AFTERNOON AND TONIGHT. THUNDERSTORMS WILL CONTINUE TO DEVELOP NORTH OF THE STATIONARY FRONT ACROSS SOUTHEAST KANSAS AND CENTRAL MISSOURI THIS AFTERNOON. THESE STORMS ARE EXPECTED TO REMAIN MOSTLY NORTH OF THE AREA THIS AFTERNOON...HOWEVER A FEW MAY BUILD SOUTHWESTWARD INTO NORTHEAST OKLAHOMA TONIGHT. IF THESE STORMS DEVELOP SOUTH...THEY WILL BE CAPABLE OF PRODUCING SOME HAIL AND LOCALLY GUSTY WINDS. RELATIVELY LOW INSTABILITY IN THIS AREA WILL LIKELY PREVENT THE DEVELOPMENT OF WIDESPREAD SEVERE THUNDERSTORMS. JUST AHEAD OF THE DRYLINE AND STATIONARY FRONT...THERE MAY BE ENOUGH LIFT FOR THUNDERSTORMS TO DEVELOP. THE AMOUNT OF LIFT IN THIS AREA IS MUCH WEAKER BUT DUE TO THE HIGHER AMOUNT OF INSTABILITY PRESENT ...ANY THUNDERSTORMS THAT DEVELOP IN THIS AREA WILL LIKLEY BECOME SEVERE WITH LARGE HAIL AND LOCALLY DAMAGING WINDS POSSIBLE. THE EXPECTED VERTICAL WIND PROFILE AND AMOUNT OF INSTABILITY IS SUFFICIENT FOR THE DEVELOPMENT OF SUPERCELL THUNDERSTORMS ACROSS AREAS GENERALLY EAST OF A GRAVETTE TO HUGO LINE THIS AFTERNOON AND EARLY TONIGHT. THE GREATEST THREAT OF TORNADOES AT THIS TIME APPEARS TO BE OVER AREAS FURTHER SOUTH AND EAST LATER TONIGHT...OVER CENTRAL AND SOUTHERN ARKANSAS AND MUCH OF LOUISIANA AND EXTREME EASTERN TEXAS. THE UPPER LEVEL SYSTEM WILL INTENSIFY AND MOVE EAST OF THE AREA EARLY FRIDAY...TAKING WITH IT ANY CHANCE OF SEVERE THUNDERSTORMS. RAIN MAY POSSIBLY CHANGE TO LIGHT SNOW BEFORE ENDING LATE FRIDAY NIGHT. THIS OUTLOOK IS INTENDED TO PROVIDE GUIDANCE TO EMERGENCY MANAGEMENT AGENCIES AND STORM SPOTTER GROUPS CONCERNING TORNADOES...SEVERE THUNDERSTORMS...HIGH WIND EVENTS...FLOODING AND WINTER WEATHER. INFORMATION CONCERNING OTHER HAZARDS CAN BE FOUND IN OTHER PRODUCTS ISSUED BY THE NATIONAL WEATHER SERVICE OFFICE IN TULSA.
Special weather statement, Jan 21, 1:00 PM CST, 3 hours 12 minutes before
ARZ001-002-010-011-019-020-029-OKZ049-053>076-221200- EASTERN OKLAHOMA/NORTHWEST ARKANSAS HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE TULSA OK 100 PM CST THU JAN 21 1999 A FEW SEVERE THUNDERSTORMS ARE POSSIBLE ACROSS NORTHWEST ARKANSAS AND FAR SOUTHEAST OKLAHOMA LATE THIS AFTERNOON AND EARLY TONIGHT...MAINLY EAST OF A GRAVETTE ARKANSAS TO HUGO OKLAHOMA LINE. A STRONG UPPER LEVEL SYSTEM WILL APPROACH OKLAHOMA AND ARKANSAS TONIGHT AND FRIDAY. IN ADVANCE OF THIS SYSTEM...UNSEASONABLY WARM AND HUMID AIR WILL CONTINUE TO ADVECT NORTHWARD INTO EASTERN OKLAHOMA AND NORTHWEST ARKANSAS. A STATIONARY FRONT WAS LOCATED EARLY THIS AFTERNOON FROM COFFEYVILLE KANSAS TO PAWNEE OKLAHOMA. A DRY LINE ALSO EXTENDED SOUTHWARD FROM THE STATIONARY FRONT FROM NEAR VINITA TO ARDMORE OKLAHOMA. THE STATIONARY FRONT IS EXPECTED TO MOVE A LITTLE SOUTH THIS AFTERNOON AND TONIGHT WHILE THE DRYLINE MOVES FAIRLY RAPIDLY EASTWARD THIS AFTERNOON...ESPECIALLY ACROSS SOUTHERN OKLAHOMA. THE STATIONARY FRONT AS WELL AS THE DRYLINE MAY PROVIDE ENOUGH LIFT FOR THUNDERSTORMS TO DEVELOP ACROSS THE AREA THIS AFTERNOON AND TONIGHT. THUNDERSTORMS WILL CONTINUE TO DEVELOP NORTH OF THE STATIONARY FRONT ACROSS SOUTHEAST KANSAS AND CENTRAL MISSOURI THIS AFTERNOON. THESE STORMS ARE EXPECTED TO REMAIN MOSTLY NORTH OF THE AREA THIS AFTERNOON...HOWEVER A FEW MAY BUILD SOUTHWESTWARD INTO NORTHEAST OKLAHOMA TONIGHT. IF THESE STORMS DEVELOP SOUTH...THEY WILL BE CAPABLE OF PRODUCING SOME HAIL AND LOCALLY GUSTY WINDS. RELATIVELY LOW INSTABILITY IN THIS AREA WILL LIKELY PREVENT THE DEVELOPMENT OF WIDESPREAD SEVERE THUNDERSTORMS. JUST AHEAD OF THE DRYLINE AND STATIONARY FRONT...THERE MAY BE ENOUGH LIFT FOR THUNDERSTORMS TO DEVELOP. THE AMOUNT OF LIFT IN THIS AREA IS MUCH WEAKER BUT DUE TO THE HIGHER AMOUNT OF INSTABILITY PRESENT ...ANY THUNDERSTORMS THAT DEVELOP IN THIS AREA WILL LIKLEY BECOME SEVERE WITH LARGE HAIL AND LOCALLY DAMAGING WINDS POSSIBLE. THE EXPECTED VERTICAL WIND PROFILE AND AMOUNT OF INSTABILITY IS SUFFICIENT FOR THE DEVELOPMENT OF SUPERCELL THUNDERSTORMS ACROSS AREAS GENERALLY EAST OF A GRAVETTE TO HUGO LINE THIS AFTERNOON AND EARLY TONIGHT. THE GREATEST THREAT OF TORNADOES AT THIS TIME APPEARS TO BE OVER AREAS FURTHER SOUTH AND EAST LATER TONIGHT...OVER CENTRAL AND SOUTHERN ARKANSAS AND MUCH OF LOUISIANA AND EXTREME EASTERN TEXAS. THE UPPER LEVEL SYSTEM WILL INTENSIFY AND MOVE EAST OF THE AREA EARLY FRIDAY...TAKING WITH IT ANY CHANCE OF SEVERE THUNDERSTORMS. RAIN MAY POSSIBLY CHANGE TO LIGHT SNOW BEFORE ENDING LATE FRIDAY NIGHT. THIS OUTLOOK IS INTENDED TO PROVIDE GUIDANCE TO EMERGENCY MANAGEMENT AGENCIES AND STORM SPOTTER GROUPS CONCERNING TORNADOES...SEVERE THUNDERSTORMS...HIGH WIND EVENTS...FLOODING AND WINTER WEATHER. INFORMATION CONCERNING OTHER HAZARDS CAN BE FOUND IN OTHER PRODUCTS ISSUED BY THE NATIONAL WEATHER SERVICE OFFICE IN TULSA.
The office that day
Everything else NWS Tulsa, OK issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jan 21, 5:22 PM CST | Severe Thunderstorm Warning | TSA | Latimer, LeFlore | 38 min |
| Jan 21, 5:56 PM CST | Severe Thunderstorm Warning | TSA | Pushmataha | 49 min |
| Jan 21, 5:58 PM CST | Severe Thunderstorm Warning | TSA | LeFlore | 32 min |
Nearby
Severe Thunderstorm Warnings in Oklahoma, 1999Every severe thunderstorm warning in 1999
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.