Alert archive / Oklahoma / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 413, NWS Tulsa, OK
NWS Tulsa, OK issued this severe thunderstorm warning at Jul 7, 1999, 1:53 PM CDT for Cherokee County, Oklahoma. It was in force for 52 min. 1 report came from 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, with what was reported inside it.
The facts
- Issued
- Jul 7, 1999, 1:53 PM CDT (18:53 UTC)
- Expired
- Jul 7, 1999, 2:45 PM CDT
- In force
- 52 min
- Issued by
- NWS Tulsa, OK
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
County Cherokee County, OK
The radar
The Tulsa radar (KINX), 52 km from the middle of the area, began a volume at 18:56 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 |
|---|---|---|---|
| Jul 7, 2:15 PM CDT | Thunderstorm Wind | Peggs, OK | A power line was blown down near Peggs. |
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, 6.9 hours before the alert went out and 151 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
- 1053 J/kg
- Mixed-layer CIN
- -76 J/kg
- Mixed-layer LCL
- 748 m above ground
- 0-6 km bulk shear
- 6 kt
- 0-1 km storm-relative helicity
- 20 m²/s²
- 0-3 km storm-relative helicity
- 35 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KTUL 071855 RRA SVRTUL OKC021-071945- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE TULSA OK 153 PM CDT WED JUL 7 1999 THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... CHEROKEE COUNTY IN EAST CENTRAL OKLAHOMA * UNTIL 245 PM CDT * AT 153 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM NEAR TAHLEQUAH...MOVING NORTH AT 10 MPH. * SOME LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE...MOODYS...PEGGS AND TAHLEQUAH HAIL TO THE SIZE OF DIMES AND WIND GUSTS TO 60 MPH CAN BE EXPECTED IN THE WARNED AREA. LAT...LON 3585 9508 3590 9487 3621 9497 3609 9520
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 Jul 7, 11:02 AM CDT, 2 hours 51 minutes earlier.
Area forecast discussion, Jul 7, 11:02 AM CDT, 2 hours 51 minutes before
EASTERN OKLAHOMA/NORTHWEST ARKANSAS FORECAST DISCUSSION NATIONAL WEATHER SERVICE TULSA OK 1102 AM CDT WED JUL 7 1999 WEAK COLD FRONT TO THE NORTH HAS STALLED FROM WESTERN KENTUCKY...ACROSS EXTREME SOUTHERN MISSOURI AND INTO SOUTHEAST KANSAS. THE FRONT SHOULD MOVE LITTLE THE REST OF TODAY. MORNING SOUNDINGS AROUND THE AREA SHOW THAT THE CONVECTIVE TEMPERATURE WILL BE REACHED AGAIN THIS AFTERNOON...SO THAT ISOLATED SHOWERS AND THUNDERSTORMS WILL OCCUR AGAIN TODAY...WITH THE MOST NUMEROUS CELLS IN THE HIGHER TERRAIN IN SOUTHEAST OKLAHOMA AND WESTERN ARKANSAS. IN ADDITION...MOISTURE CONVERGENCE WAS OCCURRING ALONG THE STALLED FRONT AT MID MORNING NEAR THE MISSOURI AND ARKANSAS BORDERS AND THIS FRONT WILL LIKELY ALSO BE THE FOCUS FOR ISOLATED DEVELOPMENT. IT WAS NOTED TODAY THAT LOW-LEVEL MOISTURE WAS A LITTLE DEEPER THAN 24 HOURS AGO...RESULTING IN FORECAST CAPES AROUND 2000 J/KG LATER TODAY. WITH A SLIGHTLY LOWER WET-BULB ZERO TODAY A STORM OR TWO COULD BRIEFLY PULSE TO NEAR SEVERE LEVELS. TEMPERATURES TODAY ARE AVERAGING OUT ABOUT AS YESTERDAY...EXCEPT IN FAR NORTHEAST SECTIONS OF THE FORECAST AREA...HARRISON AR IS RUNNING 5 DEGREES OFF YESTERDAYS PACE. ALL OF THIS COVERED IN THE GOING FORECAST AND WILL NOT MAKE ANY CHANGES TO THE ZONES AT THIS TIME. FCSTID = 8 .TUL... AR...NONE. OK...NONE.
In the hours before
Special weather statement, Jul 7, 12:50 PM CDT, 1 hour 3 minutes before
ARZ001-002-010-011-019-020-029-OKZ049-053>076-081100- EASTERN OKLAHOMA/NORTHWEST ARKANSAS HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE TULSA OK 1250 PM CDT WED JUL 7 1999 ISOLATED SEVERE THUNDERSTORMS ARE EXPECTED THIS AFTERNOON AND EARLY THIS EVENING. .SYNOPSIS... HIGH PRESSURE ALOFT WILL REMAIN ANCHORED OVER THE CENTRAL PART OF THE NATION THROUGH TONIGHT. .DISCUSSION... STRONG SURFACE HEATING HAS RESULTED IN A MODERATELY UNSTABLE AIR MASS ACROSS EASTERN OKLAHOMA AND NORTHWEST ARKANSAS. THIS COMBINED WITH A WEAK CAP WILL ALLOW WIDELY SCATTERED SHOWERS AND THUNDERSTORMS TO OCCUR ACROSS THE AREA THIS AFTERNOON AND EVENING. GIVEN THE AMOUNT OF INSTABILITY AND WEAK WINDS ALOFT A STORM OR TWO MAY BRIEFLY BECOME SEVERE WITH LARGE HAIL AND STRONG GUSTY WINDS. LOCALLY HEAVY RAINS WILL ALSO BE POSSIBLE. .EMERGENCY MANAGEMENT AGENCY AND SPOTTER ACTIVATION... STORM SPOTTER ACTIVATION IS NOT ANTICIPATED DUE TO THE BRIEF NATURE THE SEVERE WEATHER EXPECTED THIS AFTERNOON AND EVENING.
Special weather statement, Jul 7, 12:50 PM CDT, 1 hour 3 minutes before
ARZ001-002-010-011-019-020-029-OKZ049-053>076-081100- EASTERN OKLAHOMA/NORTHWEST ARKANSAS HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE TULSA OK 1250 PM CDT WED JUL 7 1999 ISOLATED SEVERE THUNDERSTORMS ARE EXPECTED THIS AFTERNOON AND EARLY THIS EVENING. .SYNOPSIS... HIGH PRESSURE ALOFT WILL REMAIN ANCHORED OVER THE CENTRAL PART OF THE NATION THROUGH TONIGHT. .DISCUSSION... STRONG SURFACE HEATING HAS RESULTED IN A MODERATELY UNSTABLE AIR MASS ACROSS EASTERN OKLAHOMA AND NORTHWEST ARKANSAS. THIS COMBINED WITH A WEAK CAP WILL ALLOW WIDELY SCATTERED SHOWERS AND THUNDERSTORMS TO OCCUR ACROSS THE AREA THIS AFTERNOON AND EVENING. GIVEN THE AMOUNT OF INSTABILITY AND WEAK WINDS ALOFT A STORM OR TWO MAY BRIEFLY BECOME SEVERE WITH LARGE HAIL AND STRONG GUSTY WINDS. LOCALLY HEAVY RAINS WILL ALSO BE POSSIBLE. .EMERGENCY MANAGEMENT AGENCY AND SPOTTER ACTIVATION... STORM SPOTTER ACTIVATION IS NOT ANTICIPATED DUE TO THE BRIEF NATURE THE SEVERE WEATHER EXPECTED THIS AFTERNOON AND EVENING.
The office that day
Everything else NWS Tulsa, OK issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 7, 12:32 PM CDT | Severe Thunderstorm Warning | TSA | Sequoyah | 43 min |
| Jul 7, 2:48 PM CDT | Severe Thunderstorm Warning | TSA | Mayes, Rogers | 42 min |
| Jul 7, 3:08 PM CDT | Flash Flood Warning | TSA | Mayes, Rogers | 2 hr |
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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.