Alert archive / Oklahoma / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 7, NWS Tulsa, OK

January 21, 1999Latimer County, LeFlore County, Pushmataha County, Oklahoma

NWS Tulsa, OK issued this severe thunderstorm warning at Jan 21, 1999, 6:41 PM CST for Latimer County, LeFlore County, Pushmataha County, Oklahoma. It was in force for 49 min. 3 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, 6:41 PM CST (00:41 UTC)
Expired: Jan 21, 1999, 7:30 PM CST
In force: 49 min
Issued by: NWS Tulsa, OK
Area: Whole counties; the outline is the Mesonet’s reconstruction

Counties Latimer County, OK, LeFlore County, OK, Pushmataha County, OK

The radar

The Western Arkansas radar (KSRX), 111 km from the middle of the area, began a volume at 00:44 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
Jan 21, 6:50 PM CST	Hail 0.75	Bengal, OK
Jan 21, 7:00 PM CST	Hail 0.75	Cloudy, OK
Jan 21, 7:24 PM CST	Hail 0.88	Summerfield, 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 watch it was issued in

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

Issued	Product	Office	Lasted
Jan 21, 5:00 PM CST	Tornado Watch	SPC	5 hr

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 0.7 hours before the alert went out and 212 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 2384 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 120 m²/s²
0-3 km storm-relative helicity: 134 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KTUL 220045
SVRTUL
OKC077-079-127-220130-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TULSA OK
641 PM CST THU JAN 21 1999

THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  LATIMER COUNTY IN SOUTHEAST OKLAHOMA
  LE FLORE COUNTY IN SOUTHEAST OKLAHOMA
  PUSHMATAHA COUNTY IN SOUTHEAST OKLAHOMA

* UNTIL 730 PM CST

* AT 641 PM CST A SEVERE THUNDERSTORM WAS LOCATED 3 MILES            
  SOUTHEAST   OF NASHOBA...MOVING NORTHEAST AT 40 MPH. ANOTHER 
  SEVERE THUNDERSTORM WAS LOCATED JUST SOUTHEAST OF KIAMICHI
  AND ANOTHER WAS LOCATED JUST SOUTH OF ANTLERS. THESE WERE
  MOVING NORTHEAST AT 40 MPH. THESE STORMS WILL MOVE INTO
  SOUTHERN LATIMER AND PUSHMATAHA COUNTY BY 7PM.


* SOME LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE...  DUNBAR...
  KELLOND...OLETA...ALBION...KIAMICHI...TUSKAHOMA...STANLEY...
  NASHOBA...SNOW...KOSOMA...MOYERS...CLOUDY...CLAYTON...ANTLERS...
  PANAMA...WISTER...HOWE...FANSHAWE...HEAVENER...TALIHINA...
  WHITESBORO...MUSE...BIG CEDAR...POTEAU...RED OAK...DAMON...
  BENGAL...YANUSH AND WILBURTON

HAIL TO THE SIZE OF NICKELS AND WIND GUSTS TO 60 MPH CAN BE EXPECTED IN
THE WARNED AREA.

BE ALERT FOR RAPIDLY CHANGING WEATHER CONDITIONS AS STORMS APPROACH.

A TORNADO WATCH IS ALSO IN EFFECT. TORNADOES CAN DEVELOP SUDDENLY
FROM SEVERE THUNDERSTORMS. BE ALERT FOR RAPIDLY CHANGING WEATHER
CONDITIONS.

LAT...LON 3420 9575 3420 9523 3465 9458 3520 9463
          3499 9534

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, 4:50 PM CST, 1 hour 51 minutes earlier.

Area forecast discussion, Jan 21, 4:50 PM CST, 1 hour 51 minutes before

EASTERN OKLAHOMA/NORTHWEST ARKANSAS FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TULSA OK
450 PM CST THU JAN 21 1999

JUST UPDATED TO ADD MENTION OF SEVERE IN A FEW ZONE GROUPINGS GIVEN
THE AREAL EXTENT OF THE NEW TORNADO WATCH BOX.  NEW RUN OF THE 21Z
RUC SHOWS LIFTED INDICES OF -10 IN SOUTHEAST OKLAHOMA AT 06Z.  MAY
NEED TO UPDATE AGAIN LATER ON TO EXTEND MENTION OF SEVERE INTO LATER
TONIGHT.

22

.TUL...
OK...NONE.
AR...NONE.

In the hours before

Special weather statement, Jan 21, 1:00 PM CST, 5 hours 41 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, 5 hours 41 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, 5 hours 41 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.

Local storm report, Jan 21, 4:42 PM CST, 1 hour 59 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
442 PM CST THU JAN 21 1999

TIME(CST)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0423 PM    STANLEY                   OK   1 INCH HAIL
01/21/99   PUSHMATAHA                     REPORTED BY CLAYTON CD
                                          DIRECTOR

Local storm report, Jan 21, 5:41 PM CST, 1 hour before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
541 PM CST THU JAN 21 1999

TIME(CST)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0529 PM    BENGAL                    OK   1 INCH HAIL
01/21/99   LATIMER                        REPORTED BY AMATEUR RADIO
                                          SPOTTER

Local storm report, Jan 21, 6:05 PM CST, 36 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
605 PM CST THU JAN 21 1999

TIME(CST)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0545 PM    LEFLORE                   OK   1 INCH HAIL
01/21/99   LE FLORE                       REPORTED BY PUBLIC

0554 PM    WISTER                    OK   1.75 INCH HAIL
01/21/99   LE FLORE                       REPORTED BY AMATEUR
                                          RADIO SPOTTER

0553 PM    8 SW CLAYTON              OK   0.75 INCH HAIL
01/21/99   PUSHMATAHA                       REPORTED BY AMATEUR
                                          RADIO SPOTTER

The office that day

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

Issued	Product	Office	Counties	Lasted
Jan 21, 6:11 PM CST	Severe Thunderstorm Warning	TSA	Latimer	34 min
Jan 21, 6:11 PM CST	Tornado Warning	TSA	LeFlore	34 min
Jan 21, 6:49 PM CST	Severe Thunderstorm Warning	TSA	Haskell	41 min
Jan 21, 7:28 PM CST	Severe Thunderstorm Warning	TSA	LeFlore	47 min
Jan 21, 8:52 PM CST	Severe Thunderstorm Warning	TSA	Choctaw	38 min
Jan 21, 9:07 PM CST	Severe Thunderstorm Warning	TSA	Pushmataha	38 min
Jan 21, 9:12 PM CST	Severe Thunderstorm Warning	TSA	LeFlore	33 min
Jan 21, 9:45 PM CST	Severe Thunderstorm Warning	TSA	LeFlore	45 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 1999 Every 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.