Alert archive / Oklahoma / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 61, NWS Tulsa, OK
NWS Tulsa, OK issued this severe thunderstorm warning at Apr 6, 1998, 9:02 PM CDT for Okfuskee County, Oklahoma. 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 6, 1998, 9:02 PM CDT (02:02 UTC)
- Expired
- Apr 6, 1998, 9:45 PM CDT
- In force
- 43 min
- Issued by
- NWS Tulsa, OK
- Area
- Whole counties
County Okfuskee County, OK
The radar
The Norman radar (KTLX), 88 km from the middle of the area, began a volume at 02:04 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 6, 9:40 PM CDT | Thunderstorm Wind 52 | Weleetka, 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 00:00Z, 2.0 hours before the alert went out and 101 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
- 112 J/kg
- Mixed-layer CIN
- -164 J/kg
- Mixed-layer LCL
- 1259 m above ground
- 0-6 km bulk shear
- 55 kt
- 0-1 km storm-relative helicity
- 176 m²/s²
- 0-3 km storm-relative helicity
- 216 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KTUL 070202 RRA SVRTUL OKC107-070245- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE TULSA OK 902 PM CDT MON APR 6 1998 THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 945 PM CDT FOR PEOPLE IN THE FOLLOWING LOCATION... IN EAST CENTRAL OKLAHOMA ...OKFUSKEE COUNTY AT 9 PM...NWS DOPPLER RADAR INDICATED A LINE OF SEVERE THUNDERSTORMS APPROACHING WESTERN OKFUSKEE COUNTY. THE STORMS WERE MOVING TO THE EAST AT 40 MPH...AND WILL MOVE ACROSS THE BEARDEN...OKEMAH... PADEN...AND CASTLE AREAS THROUGH 930 PM. HAIL TO THE SIZE OF DIMES AND WIND GUSTS TO 60 MPH CAN BE EXPECTED IN THE WARNED AREA. IF YOU ARE CAUGHT OUTSIDE... SEEK REFUGE FROM THE STORM IN A STRONG BUILDING. BOATERS ON AREA LAKES SHOULD TAKE SHELTER. DAMAGING WIND... LARGE HAIL... VERY HEAVY RAIN... AND DANGEROUS LIGHTNING ARE ALL LIKELY. DO NOT SEEK SHELTER UNDER TREES OR OTHER ISOLATED TALL OBJECTS. THESE ATTRACT LIGHTNING. DO NOT 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 Apr 6, 8:25 PM CDT, 37 minutes earlier.
Area forecast discussion, Apr 6, 8:25 PM CDT, 37 minutes before
FPUS3 KTUL 070126 AFDTUL EASTERN OKLAHOMA/NORTHWEST ARKANSAS FORECAST DISCUSSION NATIONAL WEATHER SERVICE TULSA OK 825 PM CDT MON APR 6 1998 UPDATED TO INCREASE AMBIENT WIND SPEEDS ACROSS THE AREA...NOT RELATED TO THUNDERSTORM GUSTS. EXPECT DRYING TO HELP TEMPS GET DOWN TO MINS TOWARDS SUNRISE EVEN THOUGH THEY WILL BE STEADY FOR THE NEXT FEW HOURS. BUBMPED POPS UP A LITTLE WHERE PRECIP IS EXPECTED TO BE MOST WIDESPREAD. FCSTID = 26 TUL 52 73 50 66 / 80 0 10 40 FSM 53 78 49 71 / 70 10 10 20 MLC 53 79 51 70 / 70 0 10 20 BVO 52 73 50 66 / 80 0 10 40 FYV 54 72 46 67 / 70 10 10 40 IDB 56 82 51 74 / 70 0 10 10 BYV 54 72 46 67 / 70 10 10 40 MIO 53 74 49 66 / 80 10 10 40 MKO 55 77 54 68 / 80 0 10 30 F10 55 77 54 68 / 80 0 10 30 HHW 56 82 51 74 / 70 0 10 10 .TUL... OK...NONE. AR...NONE.
In the hours before
Special weather statement, Apr 6, 6:00 PM CDT, 3 hours 2 minutes before
ARZ001-002-010-011-019-020-029-OKZ049-053>076-071200- EASTERN OKLAHOMA/NORTHWEST ARKANSAS HAZARDOUS WEATHER OUTLOOK...UPDATED NATIONAL WEATHER SERVICE TULSA OK 600 PM CDT MON APR 6 1998 A FEW SEVERE THUNDERSTORMS ARE EXPECTED ACROSS EASTERN OKLAHOMA AND NORTHWEST ARKANSAS TONIGHT. EARLY THIS EVENING A SURFACE LOW PRESSURE SYSTEM WAS INTENSIFYING OVER THE PANHANDLES AND SOUTHWEST KANSAS WITH A DRYLINE EXTENDING SOUTHWARD NEAR THE TEXAS AND FAR WESTERN OKLAHOMA STATE LINE. MEANWHILE...A STRONG UPPER LEVEL WEATHER SYSTEM CONTINUED TO SWING OUT INTO THE PLAINS. STRONG TO SEVERE THUNDERSTORMS HAVE DEVELOPED OVER WESTERN OKLAHOMA AND NORTHWEST TEXAS NEAR THE RED RIVER. ADDITIONAL STORMS ARE EXPECTED TO DEVELOP ALONG AND AHEAD OF THE DRYLINE DURING THE EVENING...WITH THE STORMS EVENTUALLY FORMING INTO A SQUALL LINE. A TORNADO WATCH IS IN EFFECT FOR MUCH OF THE WESTERN HALF OF OKLAHOMA EARLY THIS EVENING AND ADDITIONAL WATCHES ARE LIKELY LATER ON AS THE SQUALL LINE FORMS AND MOVES TO THE EAST. THE SQUALL LINE IS EXPECTED TO MOVE INTO EASTERN OKLAHOMA BETWEEN 9 PM AND MIDNIGHT...REACHING A TULSA TO MCALESTER LINE BY AROUND MIDNIGHT...THEN MOVE ON INTO NORTHWEST ARKANSAS AFTER MIDNIGHT. THE MAIN THREAT FROM SEVERE THUNDERSTORMS ALONG THE SQUALL LINE WILL BE DAMAGING STRAIGHT LINE WINDS AND LARGE HAIL. THERE IS ALSO SOME POTENTIAL FOR A FEW WIDELY SCATTERED SUPERCELL THUNDERSTORMS OUT AHEAD OF THE SQUALL LINE THIS EVENING. ANY SUPERCELL STORMS WILL BRING AN INCREASED THREAT OF TORNADOES...MAINLY FOR EASTERN OKLAHOMA. EMERGENCY MANAGEMENT AGENCIES AND STORM SPOTTER GROUPS SHOULD BE PREPARED FOR ACTIVATION TONIGHT.
Special weather statement, Apr 6, 6:00 PM CDT, 3 hours 2 minutes before
ARZ001-002-010-011-019-020-029-OKZ049-053>076-071200- EASTERN OKLAHOMA/NORTHWEST ARKANSAS HAZARDOUS WEATHER OUTLOOK...UPDATED NATIONAL WEATHER SERVICE TULSA OK 600 PM CDT MON APR 6 1998 A FEW SEVERE THUNDERSTORMS ARE EXPECTED ACROSS EASTERN OKLAHOMA AND NORTHWEST ARKANSAS TONIGHT. EARLY THIS EVENING A SURFACE LOW PRESSURE SYSTEM WAS INTENSIFYING OVER THE PANHANDLES AND SOUTHWEST KANSAS WITH A DRYLINE EXTENDING SOUTHWARD NEAR THE TEXAS AND FAR WESTERN OKLAHOMA STATE LINE. MEANWHILE...A STRONG UPPER LEVEL WEATHER SYSTEM CONTINUED TO SWING OUT INTO THE PLAINS. STRONG TO SEVERE THUNDERSTORMS HAVE DEVELOPED OVER WESTERN OKLAHOMA AND NORTHWEST TEXAS NEAR THE RED RIVER. ADDITIONAL STORMS ARE EXPECTED TO DEVELOP ALONG AND AHEAD OF THE DRYLINE DURING THE EVENING...WITH THE STORMS EVENTUALLY FORMING INTO A SQUALL LINE. A TORNADO WATCH IS IN EFFECT FOR MUCH OF THE WESTERN HALF OF OKLAHOMA EARLY THIS EVENING AND ADDITIONAL WATCHES ARE LIKELY LATER ON AS THE SQUALL LINE FORMS AND MOVES TO THE EAST. THE SQUALL LINE IS EXPECTED TO MOVE INTO EASTERN OKLAHOMA BETWEEN 9 PM AND MIDNIGHT...REACHING A TULSA TO MCALESTER LINE BY AROUND MIDNIGHT...THEN MOVE ON INTO NORTHWEST ARKANSAS AFTER MIDNIGHT. THE MAIN THREAT FROM SEVERE THUNDERSTORMS ALONG THE SQUALL LINE WILL BE DAMAGING STRAIGHT LINE WINDS AND LARGE HAIL. THERE IS ALSO SOME POTENTIAL FOR A FEW WIDELY SCATTERED SUPERCELL THUNDERSTORMS OUT AHEAD OF THE SQUALL LINE THIS EVENING. ANY SUPERCELL STORMS WILL BRING AN INCREASED THREAT OF TORNADOES...MAINLY FOR EASTERN OKLAHOMA. EMERGENCY MANAGEMENT AGENCIES AND STORM SPOTTER GROUPS SHOULD BE PREPARED FOR ACTIVATION TONIGHT.
The office that day
Everything else NWS Tulsa, OK issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 6, 8:01 PM CDT | Severe Thunderstorm Warning | TSA | Osage | 59 min |
| Apr 6, 9:04 PM CDT | Severe Thunderstorm Warning | TSA | Osage | 41 min |
| Apr 6, 9:39 PM CDT | Severe Thunderstorm Warning | TSA | McIntosh, Okmulgee | 51 min |
| Apr 6, 9:39 PM CDT | Severe Thunderstorm Warning | TSA | Pittsburg | 51 min |
| Apr 6, 9:42 PM CDT | Severe Thunderstorm Warning | TSA | Osage, Pawnee | 63 min |
| Apr 6, 10:29 PM CDT | Severe Thunderstorm Warning | TSA | McIntosh, Pittsburg | 46 min |
| Apr 6, 10:38 PM CDT | Severe Thunderstorm Warning | TSA | Haskell, Muskogee | 37 min |
| Apr 6, 10:51 PM CDT | Severe Thunderstorm Warning | TSA | Sequoyah | 39 min |
| Apr 6, 11:04 PM CDT | Severe Thunderstorm Warning | TSA | Latimer | 41 min |
| Apr 6, 11:08 PM CDT | Severe Thunderstorm Warning | TSA | Latimer | 52 min |
| Apr 6, 11:11 PM CDT | Severe Thunderstorm Warning | TSA | Pittsburg | 64 min |
| Apr 6, 11:17 PM CDT | Severe Thunderstorm Warning | TSA | Haskell, LeFlore | 43 min |
| Apr 6, 11:18 PM CDT | Severe Thunderstorm Warning | TSA | Pittsburg | 57 min |
| Apr 6, 11:25 PM CDT | Severe Thunderstorm Warning | TSA | Adair | 50 min |
| Apr 6, 11:32 PM CDT | Severe Thunderstorm Warning | TSA | Sequoyah | 28 min |
| Apr 6, 11:39 PM CDT | Severe Thunderstorm Warning | TSA | Latimer, Pushmataha | 36 min |
| Apr 6, 11:44 PM CDT | Tornado Warning | TSA | Pittsburg, Pushmataha | 46 min |
| Apr 6, 11:54 PM CDT | Severe Thunderstorm Warning | TSA | LeFlore | 66 min |
| Apr 6, 11:57 PM CDT | Severe Thunderstorm Warning | TSA | Tulsa | 33 min |
| Apr 7, 12:13 AM CDT | Severe Thunderstorm Warning | TSA | Osage | 62 min |
| Apr 7, 12:25 AM CDT | Severe Thunderstorm Warning | TSA | Wagoner | 50 min |
| Apr 7, 12:30 AM CDT | Severe Thunderstorm Warning | TSA | Pushmataha | 30 min |
| Apr 7, 12:51 AM CDT | Tornado Warning | TSA | LeFlore | 39 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.