Alert archive / Oklahoma / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 149, NWS Tulsa, OK
NWS Tulsa, OK issued this severe thunderstorm warning at Apr 26, 1999, 9:21 AM CDT for Creek County, Oklahoma. It was in force for 24 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Apr 26, 1999, 9:21 AM CDT (14:21 UTC)
- Expired
- Apr 26, 1999, 9:45 AM CDT
- In force
- 24 min
- Issued by
- NWS Tulsa, OK
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
County Creek County, OK
The radar
The Tulsa radar (KINX), 79 km from the middle of the area, began a volume at 14:20 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
Norman, OK (KOUN), launched 12:00Z, 2.4 hours before the alert went out and 120 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
- 518 J/kg
- Mixed-layer CIN
- -59 J/kg
- Mixed-layer LCL
- 644 m above ground
- 0-6 km bulk shear
- 46 kt
- 0-1 km storm-relative helicity
- 58 m²/s²
- 0-3 km storm-relative helicity
- 54 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.5
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 26, 4:25 AM CDT, 4 hours 56 minutes earlier.
Area forecast discussion, Apr 26, 4:25 AM CDT, 4 hours 56 minutes before
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</html>In the hours before
Special weather statement, Apr 26, 6:15 AM CDT, 3 hours 6 minutes before
ARZ001-002-010-011-019-020-029-OKZ049-053>076-271100- EASTERN OKLAHOMA/NORTHWEST ARKANSAS HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE TULSA OK 615 AM CDT MON APR 26 1999 ...ISOLATED SEVERE THUNDERSTORMS WILL BE POSSIBLE FROM MID MORNING THROUGH THIS EVENING ACROSS EASTERN OKLAHOMA AND NORTHWEST ARKANSAS... .SYNOPSIS... AN UPPER LOW OVER COLORADO/NEW MEXICO WILL MOVE EAST INTO KANSAS AND OKLAHOMA DURING THE DAY. STRONG TO SEVERE THUNDERSTORMS ARE EXPECTED TO DEVELOP AHEAD OF THIS UPPER LOW. A WEAK SURFACE FRONT WILL ALSO MOVE INTO EASTERN OKLAHOMA DURING THE AFTERNOON TO HELP INITIATE MORE THUNDERSTORM DEVELOPMENT. .DISCUSSION... AN UPPER LEVEL IMPULSE HAS HELPED DEVELOP STRONG THUNDERSTORMS OVER NORTH CENTRAL TEXAS AND SOUTHWEST OKLAHOMA. THESE STORMS WILL MOVE INTO EASTERN OKLAHOMA LATER THIS MORNING. AND ALTHOUGH THE AIRMASS THIS MORNING IS RELATIVELY STABLE...AN ISOLATED STORM COULD PRODUCE MARGINALLY SEVERE WEATHER BEFORE NOON. HOWEVER...THE MAIN THREAT FROM THESE STORMS WILL BE HEAVY RAIN. THE AIRMASS OVER EASTERN OKLAHOMA AND NORTHWEST ARKANSAS WILL BECOME MORE UNSTABLE THIS AFTERNOON...AS SURFACE TEMPERATURES WARM INTO THE 70S AND AS THE UPPER LOW BRINGS COOLER AIR ALOFT OVER THE AREA. MODERATE CONVERGENCE ALONG THE SURFACE FRONT SHOULD PROVIDE SUFFICIENT LIFT TO DEVELOP THUNDERSTORMS...SOME OF WHICH MAY BECOME SEVERE. LARGE HAIL WILL BE THE MAIN THREAT...ALTHOUGH STRONG WINDS WILL ALSO BE POSSIBLE. .EMERGENCY MANAGEMENT AGENCY AND SPOTTER ACTIVATION... SPOTTER ACTIVATION MAY BE NECESSARY LATER THIS MORNING IN EASTERN OKLAHOMA. SPOTTER ACTIVATION SHOULD BE EXPECTED OVER EASTERN OKLAHOMA LATER THIS AFTERNOON...AND IN NORTHWEST ARKANSAS THIS EVENING.
Special weather statement, Apr 26, 6:15 AM CDT, 3 hours 6 minutes before
ARZ001-002-010-011-019-020-029-OKZ049-053>076-271100- EASTERN OKLAHOMA/NORTHWEST ARKANSAS HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE TULSA OK 615 AM CDT MON APR 26 1999 ...ISOLATED SEVERE THUNDERSTORMS WILL BE POSSIBLE FROM MID MORNING THROUGH THIS EVENING ACROSS EASTERN OKLAHOMA AND NORTHWEST ARKANSAS... .SYNOPSIS... AN UPPER LOW OVER COLORADO/NEW MEXICO WILL MOVE EAST INTO KANSAS AND OKLAHOMA DURING THE DAY. STRONG TO SEVERE THUNDERSTORMS ARE EXPECTED TO DEVELOP AHEAD OF THIS UPPER LOW. A WEAK SURFACE FRONT WILL ALSO MOVE INTO EASTERN OKLAHOMA DURING THE AFTERNOON TO HELP INITIATE MORE THUNDERSTORM DEVELOPMENT. .DISCUSSION... AN UPPER LEVEL IMPULSE HAS HELPED DEVELOP STRONG THUNDERSTORMS OVER NORTH CENTRAL TEXAS AND SOUTHWEST OKLAHOMA. THESE STORMS WILL MOVE INTO EASTERN OKLAHOMA LATER THIS MORNING. AND ALTHOUGH THE AIRMASS THIS MORNING IS RELATIVELY STABLE...AN ISOLATED STORM COULD PRODUCE MARGINALLY SEVERE WEATHER BEFORE NOON. HOWEVER...THE MAIN THREAT FROM THESE STORMS WILL BE HEAVY RAIN. THE AIRMASS OVER EASTERN OKLAHOMA AND NORTHWEST ARKANSAS WILL BECOME MORE UNSTABLE THIS AFTERNOON...AS SURFACE TEMPERATURES WARM INTO THE 70S AND AS THE UPPER LOW BRINGS COOLER AIR ALOFT OVER THE AREA. MODERATE CONVERGENCE ALONG THE SURFACE FRONT SHOULD PROVIDE SUFFICIENT LIFT TO DEVELOP THUNDERSTORMS...SOME OF WHICH MAY BECOME SEVERE. LARGE HAIL WILL BE THE MAIN THREAT...ALTHOUGH STRONG WINDS WILL ALSO BE POSSIBLE. .EMERGENCY MANAGEMENT AGENCY AND SPOTTER ACTIVATION... SPOTTER ACTIVATION MAY BE NECESSARY LATER THIS MORNING IN EASTERN OKLAHOMA. SPOTTER ACTIVATION SHOULD BE EXPECTED OVER EASTERN OKLAHOMA LATER THIS AFTERNOON...AND IN NORTHWEST ARKANSAS THIS EVENING.
The office that day
Everything else NWS Tulsa, OK issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 26, 9:45 AM CDT | Flash Flood Warning | TSA | Creek, McIntosh, Okfuskee, Okmulgee, Tulsa | 4 hr |
| Apr 26, 9:45 AM CDT | Flash Flood Warning | TSA | Pittsburg | 4 hr |
| Apr 26, 11:27 AM CDT | Flash Flood Warning | TSA | Craig, Mayes, Nowata, Rogers, Wagoner, Washington | 3 hr |
| Apr 26, 11:27 AM CDT | Flash Flood Warning | TSA | Osage | 3 hr |
| Apr 26, 11:27 AM CDT | Flash Flood Warning | TSA | Muskogee | 3 hr |
| Apr 26, 11:57 AM CDT | Severe Thunderstorm Warning | TSA | LeFlore | 48 min |
| Apr 26, 12:33 PM CDT | Severe Thunderstorm Warning | TSA | Sequoyah | 42 min |
| Apr 26, 1:49 PM CDT | Flash Flood Warning | TSA | Craig, Ottawa | 116 min |
| Apr 26, 6:34 PM CDT | Severe Thunderstorm Warning | TSA | Pittsburg | 41 min |
| Apr 26, 1:05 PM CDT | Severe Thunderstorm Warning | TSA | Crawford | 40 min |
| Apr 26, 1:15 PM CDT | Severe Thunderstorm Warning | TSA | Franklin, Sebastian | 30 min |
| Apr 26, 1:44 PM CDT | Severe Thunderstorm Warning | TSA | Franklin, Madison | 31 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.