Alert archive / Oklahoma / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 214, NWS Tulsa, OK
NWS Tulsa, OK issued this severe thunderstorm warning at May 9, 1998, 4:21 PM CDT for LeFlore County, Oklahoma. It was in force for 54 min. 6 reports 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
- May 9, 1998, 4:21 PM CDT (21:21 UTC)
- Expired
- May 9, 1998, 5:15 PM CDT
- In force
- 54 min
- Issued by
- NWS Tulsa, OK
- Area
- Whole counties
County LeFlore County, OK
The radar
The Western Arkansas radar (KSRX), 53 km from the middle of the area, began a volume at 21:21 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 |
|---|---|---|---|
| May 9, 4:45 PM CDT | Hail 0.75 | Poteau, OK | |
| May 9, 4:55 PM CDT | Hail 0.88 | Poteau, OK | |
| May 9, 4:57 PM CDT | Thunderstorm Wind | Poteau, OK | Large trees blown down |
| May 9, 5:00 PM CDT | Hail 0.88 | Heavener, OK | |
| May 9, 5:00 PM CDT | Hail 0.75 | Conser, OK | |
| May 9, 5:04 PM CDT | Hail 0.88 | Poteau, 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
Springfield, MO (KSGF), launched 12:00Z, 9.4 hours before the alert went out and 237 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
- 1409 m above ground
- 0-6 km bulk shear
- 73 kt
- 0-1 km storm-relative helicity
- 118 m²/s²
- 0-3 km storm-relative helicity
- 25 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
700 WUUS54 KTSA 092122 RRA SVRTUL OKC079-092215- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE TULSA OK 421 PM CDT SAT MAY 9 1998 THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... LE FLORE COUNTY - SOUTHEASTERN OKLAHOMA * UNTIL 515 PM CDT * AT 420 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR DETECTED A LINE OF SEVERE THUNDERSTORMS FROM 4 WEST OF MCCURTAIN TO RED OAK TO 4 MILES SOUTHWEST OF BENGAL...MOVING EAST AT 25 MPH. IN ADDITION...RADAR SHOWED A RAPIDLY INTENSIFYING STORM NEAR HEAVENER...ALSO MOVING TO THE EAST AT 25 MPH. * SOME LOCATIONS AFFECTED INCLUDE... PANAMA POTEAU CALHOUN HAIL TO THE SIZE OF QUARTERS AND WIND GUSTS TO 60 MPH CAN BE EXPECTED IN THE WARNED AREA. BE ALERT TO RAPIDLY CHANGING WEATHER CONDITIONS AS STORMS APPROACH. WHEN THUNDERSTORMS APPROACH...TAKE COVER INSIDE A STURDY BUILDING. STAY AWAY FROM WINDOWS. TO PROTECT YOURSELF FROM LIGHTNING STAY OFF THE PHONE AND DONT USE HAND HELD ELECTRICAL APPLIANCES. MOTORISTS SHOULD NEVER DRIVE INTO AREAS WHERE WATER COVERS THE ROAD.
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 May 9, 3:30 PM CDT, 51 minutes earlier.
Area forecast discussion, May 9, 3:30 PM CDT, 51 minutes before
FPUS3 KTUL 092034 AFDTUL EASTERN OKLAHOMA/NORTHWEST ARKANSAS FORECAST DISCUSSION NATIONAL WEATHER SERVICE TULSA OK 330 PM CDT SAT MAY 9 1998 MID LVL LOW LOCATED JUST THE THE NW OF TUL...WITH CONVECTION FIRING ACRS MUCH OF ERN OK IN RESPONSE TO COOLING TEMPS ALOFT/STEEPENING LAPSE RATES. WL CARRY HIGH CHC/LIKELY POPS FOR NE OK/NW AR INTO THE EVENING...WITH ACTIVITY EXPECTED TO DIMINISH THIS EVENING AS UPR LOW SHIFTS E AND HEATING SUBSIDES. UPR LOW MVS TO E CST...ALLOWING UPR RDG TO BUILD ACRS SRN PLAINS FOR SUN. SFC RDG SETS UP ACRS AREA AS WELL...SO SHUD BE A PLEASANT DAY WITH WARM TEMPS AND LGT WNDS. NEXT UPR LOW MVS INTO GT BASIN SUN AND EVENTUALLY INTO CNTRL ROCKIES SUN NGT. AVN IS QUITE A BIT STRONGER THAN ETA/NGM THROUGH 48 HRS...AND KPS UPR LOW CLOSED OFF AS IT MVS INTO CNTRL PLAINS BY MON. WL HOLD OFF ON PCPN FOR MON AS BEST LIFT/UPR DIVG REMAINS N OF AREA...BUT WL INTRODUCE CHC POPS MON NGT AS SFC BNDRY APCHS. FCSTID = 18 TUL 54 79 56 84 / 40 0 0 10 FSM 56 80 55 84 / 50 0 0 10 MLC 54 80 56 85 / 30 0 0 10 BVO 53 79 55 83 / 40 0 0 10 FYV 52 78 50 81 / 60 0 0 10 IDB 55 83 56 86 / 20 0 0 10 BYV 52 78 50 81 / 60 0 0 10 MIO 53 78 52 82 / 60 0 0 10 MKO 54 79 55 84 / 60 0 0 10 F10 54 79 56 84 / 40 0 0 10 HHW 55 83 56 86 / 20 0 0 10 .TUL... OK...NONE. AR...NONE.
In the hours before
Local storm report, May 9, 2:39 PM CDT, 1 hour 42 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
239 PM CDT SAT MAY 09 1998
TIME(CDT) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0130 PM ALTUS AR .75 INCH HAIL
05/09/98 FRANKLINSpecial weather statement, May 9, 2:45 PM CDT, 1 hour 36 minutes before
ARZ001-002-010-011-019-020-029-OKZ049-053>076-101200- EASTERN OKLAHOMA/NORTHWEST ARKANSAS HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE TULSA OK 245 PM CDT SAT MAY 9 1998 ISOLATED SEVERE THUNDERSTORMS ARE POSSIBLE ACROSS EASTERN OKLAHOMA AND NORTHWEST ARKANSAS THROUGH THE EARLY EVENING HOURS. AT MID AFTERNOON...LOW PRESSURE WAS LOCATED OVER SOUTHEAST OKLAHOMA WITH A COLD FRONT TO ITS SOUTH ACROSS EASTERN TEXAS AND A WARM FRONT TO ITS SOUTHEAST ACROSS SOUTHWEST ARKANSAS AND NORTHEAST LOUISIANA. MEANWHILE...LOW PRESSURE IN THE UPPER ATMOSPHERE WAS LOCATED OVER NORTH CENTRAL OKLAHOMA. BOTH THE SURFACE AND UPPER ATMOSPHERIC SYSTEMS ARE EXPECTED TO MOVE EAST THIS AFTERNOON AND EVENING AND SHOULD BE EAST OF THE AREA BY LATE EVENING. DUE TO THE VERY COLD AIR ALOFT ASSOCIATED WITH THE LOW PRESSURE IN THE UPPER ATMOSPHERE ENOUGH INSTABILITY WILL EXIST FOR ISOLATED SEVERE THUNDERSTORMS ACROSS EASTERN OKLAHOMA AND NORTHWEST ARKANSASv. THE MAIN THREAT WILL BE LARGE HAIL. HOWEVER...DAMAGING WINDS CANNOT BE RULED OUT AS WELL. CIVIL DEFENSE AND SPOTTER GROUPS ACROSS EASTERN OKLAHOMA SHOULD MONITOR THE LATEST WEATHER CONDTIONS AND BE PREPARED FOR POSSIBLE ACTIVATION.
Special weather statement, May 9, 2:45 PM CDT, 1 hour 36 minutes before
ARZ001-002-010-011-019-020-029-OKZ049-053>076-101200- EASTERN OKLAHOMA/NORTHWEST ARKANSAS HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE TULSA OK 245 PM CDT SAT MAY 9 1998 ISOLATED SEVERE THUNDERSTORMS ARE POSSIBLE ACROSS EASTERN OKLAHOMA AND NORTHWEST ARKANSAS THROUGH THE EARLY EVENING HOURS. AT MID AFTERNOON...LOW PRESSURE WAS LOCATED OVER SOUTHEAST OKLAHOMA WITH A COLD FRONT TO ITS SOUTH ACROSS EASTERN TEXAS AND A WARM FRONT TO ITS SOUTHEAST ACROSS SOUTHWEST ARKANSAS AND NORTHEAST LOUISIANA. MEANWHILE...LOW PRESSURE IN THE UPPER ATMOSPHERE WAS LOCATED OVER NORTH CENTRAL OKLAHOMA. BOTH THE SURFACE AND UPPER ATMOSPHERIC SYSTEMS ARE EXPECTED TO MOVE EAST THIS AFTERNOON AND EVENING AND SHOULD BE EAST OF THE AREA BY LATE EVENING. DUE TO THE VERY COLD AIR ALOFT ASSOCIATED WITH THE LOW PRESSURE IN THE UPPER ATMOSPHERE ENOUGH INSTABILITY WILL EXIST FOR ISOLATED SEVERE THUNDERSTORMS ACROSS EASTERN OKLAHOMA AND NORTHWEST ARKANSAS. THE MAIN THREAT WILL BE LARGE HAIL. HOWEVER...DAMAGING WINDS CANNOT BE RULED OUT AS WELL. CIVIL DEFENSE AND SPOTTER GROUPS ACROSS EASTERN OKLAHOMA AND NORTHWEST ARKANSAS SHOULD MONITOR THE LATEST WEATHER CONDTIONS AND BE PREPARED FOR POSSIBLE ACTIVATION.
Special weather statement, May 9, 2:45 PM CDT, 1 hour 36 minutes before
ARZ001-002-010-011-019-020-029-OKZ049-053>076-101200- EASTERN OKLAHOMA/NORTHWEST ARKANSAS HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE TULSA OK 245 PM CDT SAT MAY 9 1998 ISOLATED SEVERE THUNDERSTORMS ARE POSSIBLE ACROSS EASTERN OKLAHOMA AND NORTHWEST ARKANSAS THROUGH THE EARLY EVENING HOURS. AT MID AFTERNOON...LOW PRESSURE WAS LOCATED OVER SOUTHEAST OKLAHOMA WITH A COLD FRONT TO ITS SOUTH ACROSS EASTERN TEXAS AND A WARM FRONT TO ITS SOUTHEAST ACROSS SOUTHWEST ARKANSAS AND NORTHEAST LOUISIANA. MEANWHILE...LOW PRESSURE IN THE UPPER ATMOSPHERE WAS LOCATED OVER NORTH CENTRAL OKLAHOMA. BOTH THE SURFACE AND UPPER ATMOSPHERIC SYSTEMS ARE EXPECTED TO MOVE EAST THIS AFTERNOON AND EVENING AND SHOULD BE EAST OF THE AREA BY LATE EVENING. DUE TO THE VERY COLD AIR ALOFT ASSOCIATED WITH THE LOW PRESSURE IN THE UPPER ATMOSPHERE ENOUGH INSTABILITY WILL EXIST FOR ISOLATED SEVERE THUNDERSTORMS ACROSS EASTERN OKLAHOMA AND NORTHWEST ARKANSASv. THE MAIN THREAT WILL BE LARGE HAIL. HOWEVER...DAMAGING WINDS CANNOT BE RULED OUT AS WELL. CIVIL DEFENSE AND SPOTTER GROUPS ACROSS EASTERN OKLAHOMA SHOULD MONITOR THE LATEST WEATHER CONDTIONS AND BE PREPARED FOR POSSIBLE ACTIVATION.
Special weather statement, May 9, 2:45 PM CDT, 1 hour 36 minutes before
ARZ001-002-010-011-019-020-029-OKZ049-053>076-101200- EASTERN OKLAHOMA/NORTHWEST ARKANSAS HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE TULSA OK 245 PM CDT SAT MAY 9 1998 ISOLATED SEVERE THUNDERSTORMS ARE POSSIBLE ACROSS EASTERN OKLAHOMA AND NORTHWEST ARKANSAS THROUGH THE EARLY EVENING HOURS. AT MID AFTERNOON...LOW PRESSURE WAS LOCATED OVER SOUTHEAST OKLAHOMA WITH A COLD FRONT TO ITS SOUTH ACROSS EASTERN TEXAS AND A WARM FRONT TO ITS SOUTHEAST ACROSS SOUTHWEST ARKANSAS AND NORTHEAST LOUISIANA. MEANWHILE...LOW PRESSURE IN THE UPPER ATMOSPHERE WAS LOCATED OVER NORTH CENTRAL OKLAHOMA. BOTH THE SURFACE AND UPPER ATMOSPHERIC SYSTEMS ARE EXPECTED TO MOVE EAST THIS AFTERNOON AND EVENING AND SHOULD BE EAST OF THE AREA BY LATE EVENING. DUE TO THE VERY COLD AIR ALOFT ASSOCIATED WITH THE LOW PRESSURE IN THE UPPER ATMOSPHERE ENOUGH INSTABILITY WILL EXIST FOR ISOLATED SEVERE THUNDERSTORMS ACROSS EASTERN OKLAHOMA AND NORTHWEST ARKANSAS. THE MAIN THREAT WILL BE LARGE HAIL. HOWEVER...DAMAGING WINDS CANNOT BE RULED OUT AS WELL. CIVIL DEFENSE AND SPOTTER GROUPS ACROSS EASTERN OKLAHOMA AND NORTHWEST ARKANSAS SHOULD MONITOR THE LATEST WEATHER CONDTIONS AND BE PREPARED FOR POSSIBLE ACTIVATION.
Local storm report, May 9, 3:35 PM CDT, 46 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
335 PM CDT SAT MAY 09 1998
TIME(CDT) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0330 PM 1 SW CROWDER OK 1.00 INCH HAIL
05/09/98 PITTSBURGThe office that day
Everything else NWS Tulsa, OK issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 9, 8:15 AM CDT | Severe Thunderstorm Warning | TSA | Creek, Okfuskee | 45 min |
| May 9, 9:00 AM CDT | Severe Thunderstorm Warning | TSA | Okfuskee | 45 min |
| May 9, 11:37 AM CDT | Severe Thunderstorm Warning | TSA | Delaware | 38 min |
| May 9, 11:54 AM CDT | Severe Thunderstorm Warning | TSA | Adair | 21 min |
| May 9, 12:07 PM CDT | Severe Thunderstorm Warning | TSA | Adair, Cherokee | 23 min |
| May 9, 12:43 PM CDT | Severe Thunderstorm Warning | TSA | Sequoyah | 32 min |
| May 9, 1:45 PM CDT | Severe Thunderstorm Warning | TSA | Okfuskee | 30 min |
| May 9, 3:04 PM CDT | Severe Thunderstorm Warning | TSA | McIntosh, Pittsburg | 41 min |
| May 9, 3:44 PM CDT | Severe Thunderstorm Warning | TSA | Haskell, Latimer | 61 min |
| May 9, 3:46 PM CDT | Severe Thunderstorm Warning | TSA | Pittsburg | 29 min |
| May 9, 5:11 PM CDT | Severe Thunderstorm Warning | TSA | LeFlore | 34 min |
Nearby
Severe Thunderstorm Warnings in Oklahoma, 1998Every severe thunderstorm warning in 1998
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.