Alert archive / Oklahoma / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 129, NWS Tulsa, OK
NWS Tulsa, OK issued this severe thunderstorm warning at Apr 22, 1999, 10:02 PM CDT for Sequoyah County, Oklahoma; Crawford County, Arkansas. It was in force for 43 min. 1 report came from inside the area while it was in force.
The area
The counties it named, with what was reported inside it.
The facts
- Issued
- Apr 22, 1999, 10:02 PM CDT (03:02 UTC)
- Expired
- Apr 22, 1999, 10:45 PM CDT
- In force
- 43 min
- Issued by
- NWS Tulsa, OK
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
Counties Crawford County, AR, Sequoyah County, OK
The radar
The Western Arkansas radar (KSRX), 31 km from the middle of the area, began a volume at 03:03 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 |
|---|---|---|---|
| Apr 22, 10:20 PM CDT | Hail 0.75 | Natural Dam, AR |
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 |
|---|---|---|---|
| Apr 22, 9:00 PM CDT | Severe Thunderstorm Watch | SPC | 4 hr |
The nearest sounding before it
Springfield, MO (KSGF), launched 00:00Z, 3.0 hours before the alert went out and 164 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
- 316 J/kg
- Mixed-layer CIN
- -172 J/kg
- Mixed-layer LCL
- 823 m above ground
- 0-6 km bulk shear
- 61 kt
- 0-1 km storm-relative helicity
- 326 m²/s²
- 0-3 km storm-relative helicity
- 336 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 0.8
The text
The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.
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 Apr 22, 8:55 PM CDT, 1 hour 7 minutes earlier.
Area forecast discussion, Apr 22, 8:55 PM CDT, 1 hour 7 minutes before
EASTERN OKLAHOMA/NORTHWEST ARKANSAS FORECAST DISCUSSION NATIONAL WEATHER SERVICE TULSA OK 855 PM CDT THU APR 22 1999 LINE HAS SLOWED ITS SOUTHWARD PROGRESSION AND STORMS MAY BE ON A WEAKENING TREND. UPDATED ZONES TO ADJUST POPS AND HEADLINES FOR SEVERE WATCH. CONSIDERED FLASH FLOOD WATCH...BUT WARNINGS ALREADY BEING ISSUED AND HEAVY RAIN THREAT MAY DIMINISH IN NEXT HOUR OR SO... BUT DID MENTION HEAVY RAINS IN ZONES FROM EC OK INTO NW ARK. /13 /13 AR...NONE. OK...NONE.
In the hours before
Special weather statement, Apr 22, 7:45 PM CDT, 2 hours 17 minutes before
ARZ001-002-010-011-019-020-029-OKZ049-053>076-230200- SPECIAL WEATHER STATEMENT...CORRECTED TIMES AND EXPIRATION NATIONAL WEATHER SERVICE TULSA OK 745 PM CDT THU APR 22 1999 TORNADO WATCH 166 REMAINS IN EFFECT UNTIL 9PM FOR THE FOLLOWING COUNTIES: IN NORTHEAST OKLAHOMA OKMULGEE...MUSKOGEE...WAGONER...CHEROKEE...ADAIR...DELAWARE AND MAYES IN NORTHWEST ARKANSAS BENTON...WASHINGTON AND CRAWFORD THE TORNADO WATCH HAS BEEN CANCELED FOR THE FOLLOWING COUNTIES: IN NORTHEAST OKLAHOMA WASHINGTON...NOWATA...CRAIG...OTTAWA...CREEK...TULSA AND ROGERS. AT 740 PM...RADAR INDICATED THE LINE OF STRONG TO SEVERE THUNDERSTORMS HAD MOVED SOUTHEASTWARD INTO FAR NORTHWEST ARKANSAS AND EASTCENTRAL OKLAHOMA. THE THREAT FOR SEVERE STORMS AND TORNADOES WILL CONTINUE UNTIL 9PM IN THE WATCH AREA. IF THREATENING WEATHER APPROACHES MOVE TO SAFE SHELTER.
Special weather statement, Apr 22, 7:45 PM CDT, 2 hours 17 minutes before
ARZ001-002-010-011-019-020-029-OKZ049-053>076-230200- SPECIAL WEATHER STATEMENT...CORRECTED TIMES AND EXPIRATION NATIONAL WEATHER SERVICE TULSA OK 745 PM CDT THU APR 22 1999 TORNADO WATCH 166 REMAINS IN EFFECT UNTIL 9PM FOR THE FOLLOWING COUNTIES: IN NORTHEAST OKLAHOMA OKMULGEE...MUSKOGEE...WAGONER...CHEROKEE...ADAIR...DELAWARE AND MAYES IN NORTHWEST ARKANSAS BENTON...WASHINGTON AND CRAWFORD THE TORNADO WATCH HAS BEEN CANCELED FOR THE FOLLOWING COUNTIES: IN NORTHEAST OKLAHOMA WASHINGTON...NOWATA...CRAIG...OTTAWA...CREEK...TULSA AND ROGERS. AT 740 PM...RADAR INDICATED THE LINE OF STRONG TO SEVERE THUNDERSTORMS HAD MOVED SOUTHEASTWARD INTO FAR NORTHWEST ARKANSAS AND EASTCENTRAL OKLAHOMA. THE THREAT FOR SEVERE STORMS AND TORNADOES WILL CONTINUE UNTIL 9PM IN THE WATCH AREA. IF THREATENING WEATHER APPROACHES MOVE TO SAFE SHELTER.
Special weather statement, Apr 22, 8:55 PM CDT, 1 hour 7 minutes before
ARZ001-002-010-011-019-020-029-OKZ049-053>076-230600- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE TULSA OK 855 PM CDT THU APR 22 1999 TORNADO WATCH 166 WILL BE ALLOWED TO EXPIRE AT 9PM. SEVERE THUNDERSTORM WATCH NUMBER 168 IS IN EFFECT UNTIL 1AM FOR THE FOLLOW COUNTIES: IN EASTERN OKLAHOMA... ADAIR...CHEROKEE...MCINTOSH...MUSKOGEE...OKFUSKEE... OKMULGEE...SEQUOYAH...PITTSBURG...HASKELL...LATIMER AND LE FLORE. IN NORTHWEST ARKANSAS... BENTON...MADISON...CARROLL...CRAWFORD...WASHINGTON...FRANKLIN AND SEBASTIAN. A LINE OF STRONG TO SEVERE THUNDERSTORMS WILL CONTINUE TO SLOWLY SAG SOUTHWARD THROUGH NORTHWEST ARKANSAS AND EASTCENTRAL OKLAHOMA. LARGE HAIL AND DAMAGING WINDS WILL BE POSSIBLE WITH THE STORMS IN THE WATCH AREA. IF THREATENING WEATHER APPROACHES MOVE TO SAFE SHELTER.
Special weather statement, Apr 22, 8:55 PM CDT, 1 hour 7 minutes before
ARZ001-002-010-011-019-020-029-OKZ049-053>076-230600- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE TULSA OK 855 PM CDT THU APR 22 1999 TORNADO WATCH 166 WILL BE ALLOWED TO EXPIRE AT 9PM. SEVERE THUNDERSTORM WATCH NUMBER 168 IS IN EFFECT UNTIL 1AM FOR THE FOLLOW COUNTIES: IN EASTERN OKLAHOMA... ADAIR...CHEROKEE...MCINTOSH...MUSKOGEE...OKFUSKEE... OKMULGEE...SEQUOYAH...PITTSBURG...HASKELL...LATIMER AND LE FLORE. IN NORTHWEST ARKANSAS... BENTON...MADISON...CARROLL...CRAWFORD...WASHINGTON...FRANKLIN AND SEBASTIAN. A LINE OF STRONG TO SEVERE THUNDERSTORMS WILL CONTINUE TO SLOWLY SAG SOUTHWARD THROUGH NORTHWEST ARKANSAS AND EASTCENTRAL OKLAHOMA. LARGE HAIL AND DAMAGING WINDS WILL BE POSSIBLE WITH THE STORMS IN THE WATCH AREA. IF THREATENING WEATHER APPROACHES MOVE TO SAFE SHELTER.
Special weather statement, Apr 22, 9:20 PM CDT, 42 minutes before
ARZ001-002-010-011-019-020-029-OKZ049-053>076-231200- EASTERN OKLAHOMA/NORTHWEST ARKANSAS HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE TULSA OK 920 PM CDT THU APR 22 1999 A SEVERE THUNDERSTORM WATCH IS IN EFFECT FOR PARTS OF SOUTHEAST OKLAHOMA AND NORTHWEST ARKANSAS UNTIL 1 AM. .SYNOPSIS... AT 920 PM...A 30 MILE WIDE BAND OF STRONG TO SEVERE THUNDERSTORMS EXTENDED FROM NEAR FAYETTEVILLE TO OKEMAH IN SOUTHERN OKFUSKEE COUNTY. THESE THUNDERSTORMS WERE ALONG A COLD FRONT THAT IS FORECAST TO SAG SLOWLY SOUTHEAST INTO PARTS OF SOUTHEAST OKLAHOMA AND WEST CENTRAL ARKANSAS THROUGH THE EARLY MORNING. .DISCUSSION... THE LINE OF THUNDERSTORMS ACROSS EAST CENTRAL OKLAHOMA AND NORTHWEST ARKANSAS IS EXPECTED TO GRADUALLY WEAKEN THROUGH 1 AM AS THEY ENCOUNTER A MORE CAPPED AIRMASS OVER SOUTHEAST OKLAHOMA AND WEST CENTRAL ARKANSAS. HOWEVER...ISOLATED SEVERE THUNDERSTORMS CAPABLE OF PRODUCING LARGE HAIL AND DAMAGING WINDS WILL BE POSSIBLE MAINLY THROUGH MIDNIGHT. FAVORABLE WIND PROFILES WILL ALSO SUPPORT THE DEVELOPMENT OF A TORNADO OR TWO...MAINLY OVER NORTHWEST ARKANSAS. IN ADDITION...DUE TO THE VERY SLOW MOVEMENT OF THIS LINE...LOCALIZED HEAVY RAINFALL AND FLASH FLOODING IS LIKELY AS THIS LINE OF THUNDERSTORMS SAGS INTO SOUTHEAST OKLAHOMA AND WEST CENTRAL ARKANSAS. .EMERGENCY MANAGEMENT AGENCY AND SPOTTER ACTIVATION... SPOTTER ACTIVATION IS IN EFFECT. HOWEVER NO SPOTTER ACTIVATION IS EXPECTED BEYOND 1 AM.
Special weather statement, Apr 22, 9:20 PM CDT, 42 minutes before
ARZ001-002-010-011-019-020-029-OKZ049-053>076-231200- EASTERN OKLAHOMA/NORTHWEST ARKANSAS HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE TULSA OK 920 PM CDT THU APR 22 1999 A SEVERE THUNDERSTORM WATCH IS IN EFFECT FOR PARTS OF SOUTHEAST OKLAHOMA AND NORTHWEST ARKANSAS UNTIL 1 AM. .SYNOPSIS... AT 920 PM...A 30 MILE WIDE BAND OF STRONG TO SEVERE THUNDERSTORMS EXTENDED FROM NEAR FAYETTEVILLE TO OKEMAH IN SOUTHERN OKFUSKEE COUNTY. THESE THUNDERSTORMS WERE ALONG A COLD FRONT THAT IS FORECAST TO SAG SLOWLY SOUTHEAST INTO PARTS OF SOUTHEAST OKLAHOMA AND WEST CENTRAL ARKANSAS THROUGH THE EARLY MORNING. .DISCUSSION... THE LINE OF THUNDERSTORMS ACROSS EAST CENTRAL OKLAHOMA AND NORTHWEST ARKANSAS IS EXPECTED TO GRADUALLY WEAKEN THROUGH 1 AM AS THEY ENCOUNTER A MORE CAPPED AIRMASS OVER SOUTHEAST OKLAHOMA AND WEST CENTRAL ARKANSAS. HOWEVER...ISOLATED SEVERE THUNDERSTORMS CAPABLE OF PRODUCING LARGE HAIL AND DAMAGING WINDS WILL BE POSSIBLE MAINLY THROUGH MIDNIGHT. FAVORABLE WIND PROFILES WILL ALSO SUPPORT THE DEVELOPMENT OF A TORNADO OR TWO...MAINLY OVER NORTHWEST ARKANSAS. IN ADDITION...DUE TO THE VERY SLOW MOVEMENT OF THIS LINE...LOCALIZED HEAVY RAINFALL AND FLASH FLOODING IS LIKELY AS THIS LINE OF THUNDERSTORMS SAGS INTO SOUTHEAST OKLAHOMA AND WEST CENTRAL ARKANSAS. .EMERGENCY MANAGEMENT AGENCY AND SPOTTER ACTIVATION... SPOTTER ACTIVATION IS IN EFFECT. HOWEVER NO SPOTTER ACTIVATION IS EXPECTED BEYOND 1 AM.
The office that day
Everything else NWS Tulsa, OK issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 22, 7:06 PM CDT | Tornado Warning | TSA | Cherokee, Wagoner | 54 min |
| Apr 22, 7:10 PM CDT | Severe Thunderstorm Warning | TSA | Muskogee, Okmulgee | 35 min |
| Apr 22, 7:39 PM CDT | Severe Thunderstorm Warning | TSA | Muskogee | 51 min |
| Apr 22, 7:50 PM CDT | Severe Thunderstorm Warning | TSA | McIntosh, Okmulgee | 40 min |
| Apr 22, 7:55 PM CDT | Flash Flood Warning | TSA | Cherokee | 3 hr |
| Apr 22, 7:58 PM CDT | Severe Thunderstorm Warning | TSA | Adair, Cherokee | 47 min |
| Apr 22, 8:16 PM CDT | Severe Thunderstorm Warning | TSA | Okfuskee, Okmulgee | 29 min |
| Apr 22, 8:28 PM CDT | Severe Thunderstorm Warning | TSA | McIntosh, Muskogee | 47 min |
| Apr 22, 8:33 PM CDT | Flash Flood Warning | TSA | Okfuskee, Okmulgee | 3 hr |
| Apr 22, 8:33 PM CDT | Flash Flood Warning | TSA | Muskogee | 3 hr |
| Apr 22, 8:44 PM CDT | Severe Thunderstorm Warning | TSA | Adair | 46 min |
| Apr 22, 9:02 PM CDT | Severe Thunderstorm Warning | TSA | Cherokee | 28 min |
| Apr 22, 9:27 PM CDT | Severe Thunderstorm Warning | TSA | Adair, Cherokee, Sequoyah | 33 min |
| Apr 22, 9:29 PM CDT | Severe Thunderstorm Warning | TSA | McIntosh, Okfuskee | 46 min |
| Apr 22, 10:10 PM CDT | Severe Thunderstorm Warning | TSA | McIntosh, Pittsburg | 50 min |
| Apr 22, 10:41 PM CDT | Flash Flood Warning | TSA | McIntosh | 64 min |
| Apr 22, 11:23 PM CDT | Severe Thunderstorm Warning | TSA | Pittsburg | 37 min |
| Apr 23, 12:26 AM CDT | Severe Thunderstorm Warning | TSA | Haskell | 34 min |
| Apr 22, 7:15 PM CDT | Severe Thunderstorm Warning | TSA | Benton | 30 min |
| Apr 22, 8:08 PM CDT | Severe Thunderstorm Warning | TSA | Benton, Washington | 37 min |
| Apr 22, 8:23 PM CDT | Tornado Warning | TSA | Washington | 22 min |
| Apr 22, 9:32 PM CDT | Severe Thunderstorm Warning | TSA | Washington | 28 min |
| Apr 22, 9:58 PM CDT | Severe Thunderstorm Warning | TSA | Washington | 32 min |
| Apr 22, 10:30 PM CDT | Severe Thunderstorm Warning | TSA | Franklin, Madison | 45 min |
| Apr 22, 10:45 PM CDT | Severe Thunderstorm Warning | TSA | Crawford | 30 min |
Nearby
Severe Thunderstorm Warnings in Oklahoma, 1999Severe Thunderstorm Warnings in Arkansas, 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.