Alert archive / Oklahoma / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 431, NWS Norman, OK
NWS Norman, OK issued this severe thunderstorm warning at Aug 18, 1997, 3:44 PM CDT for Coal County, Oklahoma. It was in force for 46 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
- Aug 18, 1997, 3:44 PM CDT (20:44 UTC)
- Expired
- Aug 18, 1997, 4:30 PM CDT
- In force
- 46 min
- Issued by
- NWS Norman, OK
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
County Coal County, OK
The radar
The Norman radar (KTLX), 122 km from the middle of the area, began a volume at 20:43 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 |
|---|---|---|---|
| Aug 18, 4:25 PM CDT | Thunderstorm Wind | Clarita, OK | A three-foot diameter tree was uprooted. |
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 12:00Z, 8.7 hours before the alert went out and 123 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
- 1292 J/kg
- Mixed-layer CIN
- -141 J/kg
- Mixed-layer LCL
- 707 m above ground
- 0-6 km bulk shear
- 7 kt
- 0-1 km storm-relative helicity
- 156 m²/s²
- 0-3 km storm-relative helicity
- 185 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 Norman, OK wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 18, 3:30 PM CDT, 14 minutes earlier.
Area forecast discussion, Aug 18, 3:30 PM CDT, 14 minutes before
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</html>In the hours before
Special weather statement, Aug 18, 12:27 PM CDT, 3 hours 17 minutes before
OKZ004>053-TXZ083>090-191100- THUNDERSTORM OUTLOOK NATIONAL WEATHER SERVICE NORMAN OK 1230 PM CDT MON AUG 18 1997 ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS THIS AFTERNOON AND OVERNIGHT OVER MOST OF CENTRAL AND WESTERN OKLAHOMA AND WESTERN NORTH TEXAS. LARGE HAIL AND VERY HEAVY RAIN ARE THE MAIN THREATS... THE SLIGHT RISK AREA IS TO THE WEST OF A LINE FROM PONCA CITY TO HOLDENVILLE TO DURANT. A STATIONARY FRONT EXTENDS ACROSS SOUTHERN OKLAHOMA...WITH HOT AND HUMID AIR TO THE SOUTH OF THIS FRONT OVER THE RED RIVER VALLEY OF OKLAHOMA AND NORTH TEXAS. THUNDERSTORMS ARE EXPECTED TO DEVELOP NEAR THE FRONT AROUND MID AFTERNOON AND LAST THROUGH SUNSET. INITIAL DEVELOPMENT WILL LIKELY OCCUR IN THE AREA FROM VERNON TEXAS NORTHEAST TOWARD LAWTON AND ARDMORE. THE ATMOSPHERE ACROSS THE RED RIVER VALLEY AREA IS EXPECTED TO BECOME VERY UNSTABLE...AND ANY STORMS THAT DEVELOP MAY PRODUCE LARGE HAIL. THE POTENTIAL ALSO EXISTS FOR ISOLATED FLASH FLOODING AS THE STORMS MOVE VERY SLOWLY AND PERSIST OVER AREAS THAT SAW HEAVY RAIN LAST NIGHT. A STORM SYSTEM IN THE UPPER LAYERS OF THE ATMOSPHERE IS MOVING ACROSS THE SOUTHERN ROCKIES AND IS APPROACHING THE PANHANDLE REGION. THUNDERSTORM DEVELOPMENT WILL ALSO OCCUR OVER WESTERN OKLAHOMA THIS AFTERNOON AS THIS STORM APPROACHES. ALTHOUGH A FEW OF THE STORMS MAY PRODUCE LARGE HAIL...THE MAIN THREAT WILL BE FOR FLASH FLOODING... ESPECIALLY OVER NORTHWEST AND NORTH-CENTRAL OKLAHOMA OVERXNIGHT. EMERGENCY MANAGEMENT OFFICIALS AND SPOTTER GROUPS IN THE SLIGHT RISK AREA SHOULD MONITOR THE LATEST FORECASTS AND BE READY FOR ACTIVATION THIS AFTERNOON THROUGH TONIGHT.
Special weather statement, Aug 18, 12:30 PM CDT, 3 hours 14 minutes before
OKZ004>053-TXZ083>090-191100- THUNDERSTORM OUTLOOK NATIONAL WEATHER SERVICE NORMAN OK 1230 PM CDT MON AUG 18 1997 ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS THIS AFTERNOON AND OVERNIGHT OVER MOST OF CENTRAL AND WESTERN OKLAHOMA AND WESTERN NORTH TEXAS. LARGE HAIL AND VERY HEAVY RAIN ARE THE MAIN THREATS... THE SLIGHT RISK AREA IS TO THE WEST OF A LINE FROM PONCA CITY TO HOLDENVILLE TO DURANT. A STATIONARY FRONT EXTENDS ACROSS SOUTHERN OKLAHOMA...WITH HOT AND HUMID AIR TO THE SOUTH OF THIS FRONT OVER THE RED RIVER VALLEY OF OKLAHOMA AND NORTH TEXAS. THUNDERSTORMS ARE EXPECTED TO DEVELOP NEAR THE FRONT AROUND MID AFTERNOON AND LAST THROUGH SUNSET. INITIAL DEVELOPMENT WILL LIKELY OCCUR IN THE AREA FROM VERNON TEXAS NORTHEAST TOWARD LAWTON AND ARDMORE. THE ATMOSPHERE ACROSS THE RED RIVER VALLEY AREA IS EXPECTED TO BECOME VERY UNSTABLE...AND ANY STORMS THAT DEVELOP MAY PRODUCE LARGE HAIL. THE POTENTIAL ALSO EXISTS FOR ISOLATED FLASH FLOODING AS THE STORMS MOVE VERY SLOWLY AND PERSIST OVER AREAS THAT SAW HEAVY RAIN LAST NIGHT. A STORM SYSTEM IN THE UPPER LAYERS OF THE ATMOSPHERE IS MOVING ACROSS THE SOUTHERN ROCKIES AND IS APPROACHING THE PANHANDLE REGION. THUNDERSTORM DEVELOPMENT WILL ALSO OCCUR OVER WESTERN OKLAHOMA THIS AFTERNOON AS THIS STORM APPROACHES. ALTHOUGH A FEW OF THE STORMS MAY PRODUCE LARGE HAIL...THE MAIN THREAT WILL BE FOR FLASH FLOODING... ESPECIALLY OVER NORTHWEST AND NORTH-CENTRAL OKLAHOMA OVERNIGHT. EMERGENCY MANAGEMENT OFFICIALS AND SPOTTER GROUPS IN THE SLIGHT RISK AREA SHOULD MONITOR THE LATEST FORECASTS AND BE READY FOR ACTIVATION THIS AFTERNOON THROUGH TONIGHT.
Local storm report, Aug 18, 3:10 PM CDT, 34 minutes before
LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OKLAHOMA
0310 PM CDT MON AUG 18 1997
TIME(CDT) .....CITY LOCATION.....STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0220 PM SULPHUR OK .75 INCH HAIL AT CHICKASAW
08/18/97 MURRAY NATIONAL RECREATION AREA.
0300 PM SULPHUR OK FLASH FLOODING
08/18/97 MURRAY POLICE DEPT. REPORTED CITY
PARK IN SULPHUR CLOSED DUE
HIGH WATER.
0240 PM MILL CREEK OK WIND DAMAGE.
08/18/97 JOHNSTON E.O.C. REPORTED SIDING BLOWN
. OFF HOUSE IN MILL CREEK.
0320 PM 7 S FITTSTOWN OK .75 INCH HAIL.
08/18/97 PONTOTOC
JLocal storm report, Aug 18, 3:42 PM CDT, 2 minutes before
LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OKLAHOMA
0310 PM CDT MON AUG 18 1997
TIME(CDT) .....CITY LOCATION.....STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0220 PM SULPHUR OK .75 INCH HAIL AT CHICKASAW
08/18/97 MURRAY NATIONAL RECREATION AREA.
0300 PM SULPHUR OK FLASH FLOODING
08/18/97 MURRAY POLICE DEPT. REPORTED CITY
PARK IN SULPHUR CLOSED DUE
HIGH WATER.
0240 PM MILL CREEK OK WIND DAMAGE.
08/18/97 JOHNSTON E.O.C. REPORTE:D SIDING BLOWN
. OFF HOUSE IN MILL CREEK.
0320 PM 7 S FITTSTOWN OK .75 INCH HAIL.
08/18/97 PONTOTOC
JThe office that day
Everything else NWS Norman, OK issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 17, 11:26 PM CDT | Severe Thunderstorm Warning | OUN | Seminole | 64 min |
| Aug 18, 9:00 AM CDT | Flash Flood Warning | OUN | Kay | 3 hr |
| Aug 18, 2:03 PM CDT | Severe Thunderstorm Warning | OUN | Murray, Pontotoc | 42 min |
| Aug 18, 2:25 PM CDT | Flash Flood Warning | OUN | Murray | 3 hr |
| Aug 18, 2:43 PM CDT | Severe Thunderstorm Warning | OUN | Johnston, Pontotoc | 47 min |
| Aug 18, 4:55 PM CDT | Severe Thunderstorm Warning | OUN | Jefferson, Stephens | 50 min |
| Aug 18, 5:33 PM CDT | Severe Thunderstorm Warning | OUN | Canadian, Kingfisher | 42 min |
| Aug 18, 5:57 PM CDT | Severe Thunderstorm Warning | OUN | Greer, Harmon | 48 min |
| Aug 18, 6:30 PM CDT | Severe Thunderstorm Warning | OUN | Grady | 30 min |
| Aug 17, 7:00 PM CDT | Severe Thunderstorm Warning | OUN | Archer, Wichita | 30 min |
| Aug 17, 7:27 PM CDT | Severe Thunderstorm Warning | OUN | Archer | 48 min |
| Aug 17, 7:37 PM CDT | Severe Thunderstorm Warning | OUN | Foard, Wilbarger | 53 min |
| Aug 17, 7:43 PM CDT | Tornado Warning | OUN | Archer | 32 min |
| Aug 17, 7:57 PM CDT | Severe Thunderstorm Warning | OUN | Knox | 48 min |
| Aug 17, 8:14 PM CDT | Severe Thunderstorm Warning | OUN | Archer | 46 min |
| Aug 17, 8:41 PM CDT | Severe Thunderstorm Warning | OUN | Knox | 49 min |
| Aug 17, 9:30 PM CDT | Severe Thunderstorm Warning | OUN | Baylor, Knox | 60 min |
Nearby
Severe Thunderstorm Warnings in Oklahoma, 1997Every severe thunderstorm warning in 1997
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.