Alert archive / Oklahoma / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 429, NWS Norman, OK
NWS Norman, OK issued this severe thunderstorm warning at Aug 18, 1997, 2:03 PM CDT for Murray County, Pontotoc County, Oklahoma. It was in force for 42 min. 3 reports 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, 2:03 PM CDT (19:03 UTC)
- Expired
- Aug 18, 1997, 2:45 PM CDT
- In force
- 42 min
- Issued by
- NWS Norman, OK
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
Counties Murray County, OK, Pontotoc County, OK
The radar
The Norman radar (KTLX), 89 km from the middle of the area, began a volume at 19:04 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 |
|---|---|---|---|
| Aug 18, 2:20 PM CDT | Hail 0.75 | Sulphur, OK | occurred at the Chickasaw National Recreation Area |
| Aug 18, 2:30 PM CDT | Thunderstorm Wind | Sulphur, OK | Severe thunderstorm winds downed tree limbs in Sulphur. |
| Aug 18, 2:40 PM CDT | Hail 0.75 | Fittstown, 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 12:00Z, 7.1 hours before the alert went out and 83 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, 10:39 AM CDT, 3 hours 24 minutes earlier.
Area forecast discussion, Aug 18, 10:39 AM CDT, 3 hours 24 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE NORMAN OK 1038 AM CDT MON AUG 18 1997 WITH NEW CONVECTION IN NW OK...IMPACT OF APPROACHING S/WV BECOMING FIXED. WARM FRONT POSITION CUTS ACROSS NORTH CENTRAL OKLAHOMA AND WL LIKELY FOCUS PCPN IN AN UNWANTED AREA. WL KEEP AN EYE THRU THE DAY ON THE POSSIBILITY FOR A FLASH FLOOD WATCH FOR GRANT..GARFIELD..KAY..NOBLE AND PAYNE COUNTIES. NUMEROUS OUTFLOW BOUNDARIES IN SOUTH CENTRAL AND SOUTHWEST ZONES THE OTHER SENSITIVE LOCATION FOCUSING FOCUSING PCPN. AN FFA IN THAT REGION DUE TO TRAINING ECHOES IS ALSO A DISTINCT POSSIBILITY. ZONE UPDATE ADJUSTMENTS WL INCLUDE AN INCREASE TO ZONE POPS IN NORTHWEST..WEST CENTRAL AND NORTH CENTRAL ZONES BASRED ON PRESENT SITUATION...MORE CLOUDINESS TO SW ZONES THAN EXPECTED AS SEEN FROM SAT...TONE DOWN TEMPS IN SW...AND REWORD MORNING TO EVE TRANSITIONAL TEXT. FCSTID = 85 .OKC... OK...NONE. TX...NONE.
In the hours before
Local storm report, Aug 18, 9:40 AM CDT, 4 hours 23 minutes before
LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OKLAHOMA
0940 AM CDT MON AUG 18 1997
TIME(CDT) .....CITY LOCATION.....STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0925 AM OK FLASH FLOODING.
08/17/97 KAY SHERIFF REPORTS WATER OVER
HIGHWAYS IN SEVERAL LOCATIONS
ACROSS KAY COUNTY.
JLocal storm report, Aug 18, 9:43 AM CDT, 4 hours 20 minutes before
LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OKLAHOMA
0940 AM CDT MON AUG 18 1997
TIME(CDT) .....CITY LOCATION.....STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0925 AM OK FLASH FLOODING.
08/17/97 KAY SHERIFF REPORTS WATER OVER
HIGHWAYS IN SEVERAL LOCATIONS
ACROSS KAY COUNTY. :
JSpecial weather statement, Aug 18, 12:27 PM CDT, 1 hour 36 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, 1 hour 33 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.
The 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, 2:25 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, 3:44 PM CDT | Severe Thunderstorm Warning | OUN | Coal | 46 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.