Alert archive / Oklahoma / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 316, NWS Tulsa, OK
NWS Tulsa, OK issued this severe thunderstorm warning at Aug 20, 1997, 4:38 PM CDT for Cherokee County, Delaware County, Mayes County, Oklahoma. It was in force for 52 min. 2 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 20, 1997, 4:38 PM CDT (21:38 UTC)
- Expired
- Aug 20, 1997, 5:30 PM CDT
- In force
- 52 min
- Issued by
- NWS Tulsa, OK
- Area
- Whole counties
Counties Cherokee County, OK, Delaware County, OK, Mayes County, OK
The radar
The Tulsa radar (KINX), 50 km from the middle of the area, began a volume at 21:41 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 20, 4:45 PM CDT | Thunderstorm Wind | Rose, OK | |
| Aug 20, 4:52 PM CDT | Thunderstorm Wind 52 | Scraper, 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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Aug 20, 3:00 PM CDT | Severe Thunderstorm Watch | SPC | 4 hr |
The nearest sounding before it
Springfield, MO (KSGF), launched 12:00Z, 9.6 hours before the alert went out and 133 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
- 351 J/kg
- Mixed-layer CIN
- -38 J/kg
- Mixed-layer LCL
- 653 m above ground
- 0-6 km bulk shear
- 26 kt
- 0-1 km storm-relative helicity
- 1 m²/s²
- 0-3 km storm-relative helicity
- 49 m²/s²
- Significant tornado parameter
- -0.0
- Supercell composite
- -0.1
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KTUL 202138 RRA SVRTUL OKC021-041-097-202230- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE TULSA OK 438 PM CDT WED AUG 20 1997 THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 530 PM CDT FOR PEOPLE IN THE FOLLOWING LOCATIONS... IN EAST CENTRAL OKLAHOMA ...NORTHERN CHEROKEE COUNTY IN NORTHEAST OKLAHOMA ...SOUTHERN DELAWARE COUNTY...SOUTHEASTERN MAYES COUNTY AT 438 PM...RADAR INDICATED A SEVERE THUNDERSTORM NEAR ROSE...MOVING TO THE SOUTHEAST AT 30 MPH. LEACH...SCRAPER...OAKS...AND KANSAS ARE IN THE PATH OF THIS STORM. HAIL TO THE SIZE OF DIMES AND WIND GUSTS TO 60 MPH CAN BE EXPECTED IN THE WARNED AREA.
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 Aug 20, 4:05 PM CDT, 33 minutes earlier.
Area forecast discussion, Aug 20, 4:05 PM CDT, 33 minutes before
FPUS3 KTUL 202101 AFDTUL EASTERN OKLAHOMA/NORTHWEST ARKANSAS FORECAST DISCUSSION NATIONAL WEATHER SERVICE TULSA OK 405 PM CDT WED AUG 20 1997 CLUSTER OF STG/SVR TSRA CONTS MOVG SE ACRS NE OKLA THIS AFTN. XPCT THIS ACTIVITY TO GRADLY DIMINISH THIS EVE AFTER LOSS OF HEATING...ALTHO CANT RULE OUT AN ISOLD TSRA AFTER DARK ACRS MAINLY NE OKLA AS LEFTOVER BNDRIES AND UPR SPEED MAX AID DVLPMENT. XPCT CONTD THREAT OF TSRA THRU LATE WEEK AS NW FLOW REGIME CONTINUES. WL PLACE HIEST POPS THURS THROUGH FRIDAY ACRS WRN PART OF FA...WHERE AN ORGANIZED MCS MAY AFFECT A LARGE PART OF CNTRL/ERN OKLA LATE THURS NITE AND EARLY FRI. SOME LO LVL DRYING WILL GRADLY WORK INTO THE FCST AREA FROM THE NE ON FRI...WITH NE WINDS AND CLDS/SHRA KEEPING TEMPS IN THE 80S MOST AREAS. FCSTID = 9 TUL 69 91 68 87 / 20 20 40 40 FSM 70 94 69 89 / 20 10 20 40 MLC 70 94 69 90 / 20 20 30 40 BVO 68 91 66 87 / 20 20 40 40 FYV 66 89 65 86 / 20 10 20 30 IDB 70 95 70 93 / 20 10 20 30 BYV 65 88 64 85 / 20 10 20 30 MIO 66 89 65 86 / 20 20 30 40 MKO 69 91 68 87 / 20 20 40 40 F10 69 92 68 88 / 20 20 40 40 .TUL... OK...NONE. AR...NONE.
In the hours before
Local storm report, Aug 20, 3:33 PM CDT, 1 hour 5 minutes before
STORM REPORT
NATIONAL WEATHER SERVICE TULSA, OK
333 PM CDT WED AUG 20 1997
TIME(CDT) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0300 PM DEWEY OK WIND DAMAGE
08/20/97 WASHINGTON PLATE GLASS WINDOW BLOWN
OUT OF A BUILDING
0300 PM 1 SE CLAREMORE OK WIND DAMAGE
08/20/97 WASHINGTON SEVERAL POWER LINES DOWN
IN BARTLESVILLELocal storm report, Aug 20, 3:33 PM CDT, 1 hour 5 minutes before
STORM REPORT...CORRECTED
NATIONAL WEATHER SERVICE TULSA, OK
333 PM CDT WED AUG 20 1997
TIME(CDT) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0300 PM DEWEY OK WIND DAMAGE
08/20/97 WASHINGTON PLATE GLASS WINDOW BLOWN
OUT OF A BUILDING
0300 PM BARTLESVILLE OK WIND DAMAGE
08/20/97 WASHINGTON SEVERAL POWER LINES DOWN
IN BARTLESVILLELocal storm report, Aug 20, 3:35 PM CDT, 1 hour 3 minutes before
STORM REPORT
NATIONAL WEATHER SERVICE TULSA, OK
333 PM CDT WED AUG 20 1997
TIME(CDT) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0300 PM DEWEY OK WIND DAMAGE
08/20/97 WASHINGTON PLATE GLASS WINDOW BLOWN
OUT OF A BUILDING
0300 PM 1 SE CLAREMORE OK WIND DAMAGE
08/20/97 WASHINGTON SEVERAL POWER LINES DOWN
IN BARTLESVILLELocal storm report, Aug 20, 3:47 PM CDT, 51 minutes before
STORM REPORT...CORRECTED
NATIONAL WEATHER SERVICE TULSA, OK
333 PM CDT WED AUG 20 1997
TIME(CDT) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0300 PM DEWEY OK WIND DAMAGE
08/20/97 WASHINGTON PLATE GLASS WINDOW BLOWN
OUT OF A BUILDING
0300 PM BARTLESVILLE OK WIND DAMAGE
08/20/97 WASHINGTON SEVERAL POWER LINES DOWN
IN BARTLESVILLELocal storm report, Aug 20, 3:57 PM CDT, 41 minutes before
STORM REPORT
NATIONAL WEATHER SERVICE TULSA, OK
357 PM CDT WED AUG 20 1997
TIME(CDT) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0326 PM DELAWARE OK WIND DAMAGE
08/20/97 NOWATA SEVERAL LARGE TREE LIMBS
BLOWN DOWN IN DELAWARELocal storm report, Aug 20, 3:58 PM CDT, 40 minutes before
STORM REPORT
NATIONAL WEATHER SERVICE TULSA, OK
357 PM CDT WED AUG 20 1997
TIME(CDT) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0326 PM DELAWARE OK WIND DAMAGE
08/20/97 NOWATA SEVERAL LARGE TREE LIMBS
BLOWN DOWN IN DELAWAREThe office that day
Everything else NWS Tulsa, OK issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 20, 2:07 PM CDT | Severe Thunderstorm Warning | TSA | Osage | 38 min |
| Aug 20, 2:34 PM CDT | Severe Thunderstorm Warning | TSA | Osage, Washington | 56 min |
| Aug 20, 3:16 PM CDT | Severe Thunderstorm Warning | TSA | Nowata | 44 min |
| Aug 20, 3:24 PM CDT | Severe Thunderstorm Warning | TSA | Rogers, Tulsa | 51 min |
| Aug 20, 4:49 PM CDT | Severe Thunderstorm Warning | TSA | Adair | 26 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.