Alert archive / Oklahoma / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 95, NWS Tulsa, OK
NWS Tulsa, OK issued this severe thunderstorm warning at Apr 5, 1999, 10:51 AM CDT for Adair County, Sequoyah County, Oklahoma. It was in force for 39 min. No storm report in the archive falls 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.
The facts
- Issued
- Apr 5, 1999, 10:51 AM CDT (15:51 UTC)
- Expired
- Apr 5, 1999, 11:30 AM CDT
- In force
- 39 min
- Issued by
- NWS Tulsa, OK
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
Counties Adair County, OK, Sequoyah County, OK
The radar
The Western Arkansas radar (KSRX), 51 km from the middle of the area, began a volume at 15:53 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.
The nearest sounding before it
Springfield, MO (KSGF), launched 12:00Z, 3.9 hours before the alert went out and 160 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
- 1 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 780 m above ground
- 0-6 km bulk shear
- 55 kt
- 0-1 km storm-relative helicity
- 455 m²/s²
- 0-3 km storm-relative helicity
- 592 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 051559 SVRTUL OKC001-135-051630- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE TULSA OK 1051 AM CDT MON APR 5 1999 THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... ADAIR COUNTY IN EAST CENTRAL OKLAHOMA SEQUOYAH COUNTY IN EAST CENTRAL OKLAHOMA * UNTIL 1130 AM CDT * AT 1051 AM CDT A SEVERE THUNDERSTORM WAS LOCATED 4 MILES SOUTHWEST OF BRUSHY...MOVING NORTHEAST AT 50 MPH. * SOME LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE... MARBLE CITY...BRUSHY...BUNCH AND STILWELL HAIL TO THE SIZE OF DIMES AND WIND GUSTS TO 70 MPH CAN BE EXPECTED IN THE WARNED AREA. LAT...LON 3557 9486 3547 9474 3565 9447 3602 9454
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 5, 7:50 AM CDT, 3 hours 1 minute earlier.
Area forecast discussion, Apr 5, 7:50 AM CDT, 3 hours 1 minute before
EASTERN OKLAHOMA/NORTHWEST ARKANSAS FORECAST DISCUSSION NATIONAL WEATHER SERVICE TULSA OK 750 AM CDT MON APR 5 1999 WILL ISSUE UPDATE SHORTLY TO ACCOUNT FOR NEW WATCH BOX CONFIGURATION. SPC SAYS THEY WILL MONITOR ACTIVITY FURTHER SOUTH AND ISSUE WATCH LATER IF IT PERSISTS. ODDLY...INSTABILITY ANALYSIS SHOWS A MINIMUM IN THE INSTABILITY AXIS WHERE THE CURRENT CONVECTION IS THAT WE ARE WARNING ON. HOWEVER...SURFACE WINDS HAVE BACKED SLIGHTLY IN ADVANCE OF THIS ACTIVITY IN THE PAST TWO HOURS...SO SURFACE MOISTURE CONVERGENCE HAS INCREASED SOME. WITH DAYTIME HEATING...SOME INTENSIFICATION IS POSSIBLE LATER THIS MORNING. HOWEVER WITH BEST DYNAMIC LIFT IN KS/MO...BELIEVE ACTIVITY SOUTH OF NEW WATCH BOX WILL SIMPLY MAINTAIN ITSELF FOR A COUPLE MORE HOURS. FCSTID = 22 .TUL... OK...TORNADO WATCH UNTIL 200 PM CDT FOR ZONES OKZ054>058. AR...NONE.
In the hours before
Special weather statement, Apr 5, 6:05 AM CDT, 4 hours 46 minutes before
ARZ001-002-010-011-019-020-029-OKZ049-053>076-061200- EASTERN OKLAHOMA/NORTHWEST ARKANSAS HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE TULSA OK 605 AM CDT MON APR 5 1999 ...A FEW SEVERE THUNDERSTORMS ARE POSSIBLE ACROSS EASTERN OKLAHOMA AND NORTHWEST ARKANSAS THIS MORNING AND AFTERNOON... .SYNOPSIS... A STRONG UPPER LEVEL LOW PRESSURE SYSTEM OVER NORTHERN NEW MEXICO EARLY THIS MORNING WILL LIFT INTO WESTERN KANSAS BY THIS AFTERNOON. MEANWHILE...SURFACE LOW PRESSURE ACROSS NORTHWEST OKLAHOMA WILL MOVE INTO NORTHEASTERN KANSAS...WITH A DRYLINE PUSHING INTO FAR EASTERN OKLAHOMA THIS AFTERNOON. .DISCUSSION... THE AIRMASS ACROSS EASTERN OKLAHOMA REMAINS VERY MOIST AND UNSTABLE THIS MORNING...WITH SURFACE DEWPOINTS IN THE LOWER TO MID 60S. STRONG SOUTHERLY TO SOUTHEASTERLY LOW-LEVEL WINDS WILL RESULT IN CONTINUED STRONG LIFT ACROSS THE REGION. AN INITIAL BAND OF SHOWERS AND A FEW THUNDERSTORMS WILL MOVE ACROSS EASTERN OKLAHOMA EARLY THIS MORNING BETWEEN 6 AM AND 9 AM....BUT THIS ACTIVITY SHOULD REMAIN BELOW SEVERE LIMITS. MEANWHILE...A SECONDARY LINE OF THUNDERSTORMS OVER SOUTH CENTRAL OKLAHOMA EARLY THIS MORNING WILL CONTINUE TO MOVE QUICKLY NORTHEAST. THESE THUNDERSTORMS SHOULD REMAIN STRONG TO SEVERE AS THE DRYLINE PUNCHES INTO CENTRAL OKLAHOMA AND COOLER TEMPERATURES ALOFT SPREAD EAST. THIS ACTIVITY SHOULD EVENTUALLY FORM INTO A BROKEN SQUALL LINE...AND MOVE THROUGH EASTERN OKLAHOMA AFTER 9 AM AND EVENTUALLY REACH NORTHWEST ARKANSAS AROUND 11 AM. STRONG STRAIGHT-LINE WINDS WILL BE THE PRIMARY SEVERE WEATHER THREAT. THE SEVERE WEATHER THREAT SHOULD DIMINISH AFTER 2 TO 3 PM AS THE LINE OF THUNDERSTORMS MOVES FARTHER EAST INTO ARKANSAS. .EMERGENCY AGENCY AND SPOTTER ACTIVATION... STORM SPOTTER ACTIVATION MAY BE NEEDED THIS MORNING ACROSS EASTERN OKLAHOMA AND NORTHWEST ARKANSAS. AN UPDATED HAZARDOUS WEATHER OUTLOOK WILL BE ISSUED AROUND 1 PM.
Special weather statement, Apr 5, 6:05 AM CDT, 4 hours 46 minutes before
ARZ001-002-010-011-019-020-029-OKZ049-053>076-061200- EASTERN OKLAHOMA/NORTHWEST ARKANSAS HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE TULSA OK 605 AM CDT MON APR 5 1999 ...A FEW SEVERE THUNDERSTORMS ARE POSSIBLE ACROSS EASTERN OKLAHOMA AND NORTHWEST ARKANSAS THIS MORNING AND AFTERNOON... .SYNOPSIS... A STRONG UPPER LEVEL LOW PRESSURE SYSTEM OVER NORTHERN NEW MEXICO EARLY THIS MORNING WILL LIFT INTO WESTERN KANSAS BY THIS AFTERNOON. MEANWHILE...SURFACE LOW PRESSURE ACROSS NORTHWEST OKLAHOMA WILL MOVE INTO NORTHEASTERN KANSAS...WITH A DRYLINE PUSHING INTO FAR EASTERN OKLAHOMA THIS AFTERNOON. .DISCUSSION... THE AIRMASS ACROSS EASTERN OKLAHOMA REMAINS VERY MOIST AND UNSTABLE THIS MORNING...WITH SURFACE DEWPOINTS IN THE LOWER TO MID 60S. STRONG SOUTHERLY TO SOUTHEASTERLY LOW-LEVEL WINDS WILL RESULT IN CONTINUED STRONG LIFT ACROSS THE REGION. AN INITIAL BAND OF SHOWERS AND A FEW THUNDERSTORMS WILL MOVE ACROSS EASTERN OKLAHOMA EARLY THIS MORNING BETWEEN 6 AM AND 9 AM....BUT THIS ACTIVITY SHOULD REMAIN BELOW SEVERE LIMITS. MEANWHILE...A SECONDARY LINE OF THUNDERSTORMS OVER SOUTH CENTRAL OKLAHOMA EARLY THIS MORNING WILL CONTINUE TO MOVE QUICKLY NORTHEAST. THESE THUNDERSTORMS SHOULD REMAIN STRONG TO SEVERE AS THE DRYLINE PUNCHES INTO CENTRAL OKLAHOMA AND COOLER TEMPERATURES ALOFT SPREAD EAST. THIS ACTIVITY SHOULD EVENTUALLY FORM INTO A BROKEN SQUALL LINE...AND MOVE THROUGH EASTERN OKLAHOMA AFTER 9 AM AND EVENTUALLY REACH NORTHWEST ARKANSAS AROUND 11 AM. STRONG STRAIGHT-LINE WINDS WILL BE THE PRIMARY SEVERE WEATHER THREAT. THE SEVERE WEATHER THREAT SHOULD DIMINISH AFTER 2 TO 3 PM AS THE LINE OF THUNDERSTORMS MOVES FARTHER EAST INTO ARKANSAS. .EMERGENCY AGENCY AND SPOTTER ACTIVATION... STORM SPOTTER ACTIVATION MAY BE NEEDED THIS MORNING ACROSS EASTERN OKLAHOMA AND NORTHWEST ARKANSAS. AN UPDATED HAZARDOUS WEATHER OUTLOOK WILL BE ISSUED AROUND 1 PM.
Local storm report, Apr 5, 8:30 AM CDT, 2 hours 21 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
830 AM CDT MON APR 05 1999
TIME(CDT) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0810 AM WELEETKA OK 65 MPH TSTM GUST
04/05/99 OKFUSKEE REPORTED BY PUBLIC
AT CITY POST OFFICE.Local storm report, Apr 5, 8:45 AM CDT, 2 hours 6 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
845 AM CDT MON APR 05 1999
TIME(CDT) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0825 AM HENRYETTA OK 60 MPH TSTM GUST
04/05/99 OKMULGEE ESTIMATED BY HENRYETTA
AIRPORT EMPLOYEES.Special weather statement, Apr 5, 10:49 AM CDT, 2 minutes before
OKZ054>058-051649-
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE TULSA OK
1049 AM CDT MON APR 5 1999
THE TORNADO WATCH HAS BEEN CANCELLED FOR THE FOLLOWING COUNTIES IN
EASTERN OKLAHOMA.
CRAIG NOWATA OSAGE
OTTAWA WASHINGTON
THE THREAT OF SEVERE WEATHER HAS MOVED TO THE EAST OF THE AREA.Special weather statement, Apr 5, 10:49 AM CDT, 2 minutes before
OKZ054>058-051649-
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE TULSA OK
1049 AM CDT MON APR 5 1999
THE TORNADO WATCH HAS BEEN CANCELLED FOR THE FOLLOWING COUNTIES IN
EASTERN OKLAHOMA.
CRAIG NOWATA OSAGE
OTTAWA WASHINGTON
THE THREAT OF SEVERE WEATHER HAS MOVED TO THE EAST OF THE AREA.The office that day
Everything else NWS Tulsa, OK issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 4, 7:10 PM CDT | Severe Thunderstorm Warning | TSA | Adair, Sequoyah | 35 min |
| Apr 4, 7:42 PM CDT | Severe Thunderstorm Warning | TSA | Adair | 33 min |
| Apr 5, 7:30 AM CDT | Severe Thunderstorm Warning | TSA | Okfuskee | 45 min |
| Apr 5, 8:01 AM CDT | Severe Thunderstorm Warning | TSA | McIntosh, Okmulgee | 44 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.