Alert archive / Oklahoma / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 434, NWS Tulsa, OK
NWS Tulsa, OK issued this severe thunderstorm warning at Aug 13, 1999, 6:26 PM CDT for Choctaw County, Oklahoma. It was in force for 19 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 13, 1999, 6:26 PM CDT (23:26 UTC)
- Expired
- Aug 13, 1999, 6:45 PM CDT
- In force
- 19 min
- Issued by
- NWS Tulsa, OK
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
County Choctaw County, OK
The radar
The Western Arkansas radar (KSRX), 178 km from the middle of the area, began a volume at 23:26 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 13, 6:35 PM CDT | Thunderstorm Wind | Unger, OK | There was tree damage near the intersection of OK Hwy 109 and Unger Road. |
| Aug 13, 6:35 PM CDT | Hail 0.75 | Unger, OK | Location: intersection of OK Hwy 109 and Unger Road. |
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, 11.4 hours before the alert went out and 215 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
- 33 J/kg
- Mixed-layer CIN
- -239 J/kg
- Mixed-layer LCL
- 2777 m above ground
- 0-6 km bulk shear
- 31 kt
- 0-1 km storm-relative helicity
- -58 m²/s²
- 0-3 km storm-relative helicity
- -24 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 Tulsa, OK wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 13, 3:59 PM CDT, 2 hours 27 minutes earlier.
Area forecast discussion, Aug 13, 3:59 PM CDT, 2 hours 27 minutes before
EASTERN OKLAHOMA/NORTHWEST ARKANSAS FORECAST DISCUSSION NATIONAL WEATHER SERVICE TULSA OK 359 PM CDT FRI AUG 13 1999 PROBLEM(S) OF THE DAY: TEMPERATURES WILL KEEP SOME SLIGHT CHANCE POPS AHEAD OF FRONT JUST MOVING INTO S PUSHMATAHA AND CHOCTAW COUNTIES FOR THIS EVENING. FRONT EXPECTED TO PUSH INTO TX WITH DRIER AIR PUSHING OVER ALL OF THE AREA. REST OF FCST JUST CONCERNED WITH TEMPS. DEWPOINTS IN UPPER 50S TO LOWER 60S EXPECTED TO SPREAD INTO MOST AREAS WITH NE WINDS DECREASING LATER TONIGHT. NE WINDS REMAIN IN THE AREA SATURDAY WITH TEMPS COOLER IN FSM/MLC AREA AND ABOUT AS TODAY IN THE NORTH. UPPER HI BUILDS BACK OVERHEAD SUNDAY AND MONDAY AND RIDGE REMAINS OVER SOUTHERN PLAINS THROUGH EXTENDED FORECAST. ECMWF/MRF/NOGAPS DIFFER SLIGHTLY ON TRACK OF A WAVE FCST TO MOVE ACROSS THE PLAINS WED/THU...SO COULD SEE A FRONT IN THE AREA BY THEN...BUT FOR NOW WILL LEAVE FCST DRY. STAYED CLOSE TO FWC TEMPS. FCSTID = 13 TUL 65 93 67 93 / 0 0 0 0 FSM 67 95 67 97 / 0 0 0 0 MLC 67 95 67 97 / 0 0 0 0 BVO 63 90 65 93 / 0 0 0 0 FYV 60 87 60 90 / 0 0 0 0 BYV 60 87 60 90 / 0 0 0 0 MIO 63 90 65 93 / 0 0 0 0 MKO 65 93 67 93 / 0 0 0 0 F10 65 93 67 93 / 0 0 0 0 HHW 67 95 67 97 / 20 0 0 0 .TUL... AR...NONE. OK...NONE. -------------------- EXPERIMENTAL OUTPUT: HAZARDOUS WEATHER EXPECTED NEXT 24 HOURS: NONE NGM CONFIDENCE: 8 ON A SCALE OF 0 TO 10 ETA CONFIDENCE: 7 ON A SCALE OF 0 TO 10 AVN CONFIDENCE: 7 ON A SCALE OF 0 TO 10 FCST CONFIDENCE: 8 ON A SCALE OF 0 TO 10
In the hours before
Local storm report, Aug 13, 3:48 PM CDT, 2 hours 38 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
348 PM CDT FRI AUG 13 1999
TIME(CDT) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0630 PM RAMONA OK WIND DAMAGE
08/12/99 WASHINGTON A FEW TREES AND TREE
LIMBS WERE BLOWN DOWN.
0635 PM 2 NW VERA OK WIND DAMAGE
08/12/99 WASHINGTON 12-14 DIAMETER TREES
BLOWN DOWN...FRAME
FENCE BLOWN DOWN...ROOF
TILES BLOWN OFF A
HOUSE...B&B SIGN BLOWN
DOWN NEAR JARRETT FARMSSpecial weather statement, Aug 13, 3:53 PM CDT, 2 hours 33 minutes before
ARZ019-020-029-OKZ049-053-072>076-132100- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE TULSA OK 353 PM CDT FRI AUG 13 1999 ...EXCESSIVE HEAT ADVISORY HAS EXPIRED... A COLD FRONT WILL CONTINUE TO BRING COOLER TEMPERATURES INTO EASTERN OKLAHOMA AND NORTHWEST ARKANSAS TONIGHT AND SATURDAY... ENDING THE EXCESSIVE HEAT OVER ALL OF THE AREA.
Special weather statement, Aug 13, 3:53 PM CDT, 2 hours 33 minutes before
ARZ019-020-029-OKZ049-053-072>076-132100- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE TULSA OK 353 PM CDT FRI AUG 13 1999 ...EXCESSIVE HEAT ADVISORY HAS EXPIRED... A COLD FRONT WILL CONTINUE TO BRING COOLER TEMPERATURES INTO EASTERN OKLAHOMA AND NORTHWEST ARKANSAS TONIGHT AND SATURDAY... ENDING THE EXCESSIVE HEAT OVER ALL OF THE AREA.
Local storm report, Aug 13, 5:35 PM CDT, 51 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
535 PM CDT FRI AUG 13 1999
TIME(CDT) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0525 PM 1 E RATTAN OK .88 INCH HAIL
08/13/99 PUSHMATAHALocal storm report, Aug 13, 5:35 PM CDT, 51 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
535 PM CDT FRI AUG 13 1999
TIME(CDT) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0525 PM 1 E RATTAN OK .88 INCH HAIL
08/13/99 PUSHMATAHALocal storm report, Aug 13, 5:45 PM CDT, 41 minutes before
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</html>The office that day
Everything else NWS Tulsa, OK issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 12, 7:01 PM CDT | Severe Thunderstorm Warning | TSA | Rogers | 44 min |
| Aug 12, 7:39 PM CDT | Severe Thunderstorm Warning | TSA | Mayes | 51 min |
| Aug 12, 9:08 PM CDT | Severe Thunderstorm Warning | TSA | Rogers | 37 min |
| Aug 13, 4:21 PM CDT | Severe Thunderstorm Warning | TSA | Pushmataha | 39 min |
| Aug 13, 4:44 PM CDT | Severe Thunderstorm Warning | TSA | Choctaw | 61 min |
| Aug 13, 4:52 PM CDT | Severe Thunderstorm Warning | TSA | Pushmataha | 53 min |
| Aug 13, 5:39 PM CDT | Severe Thunderstorm Warning | TSA | Choctaw, Pushmataha | 51 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.