Alert archive / Oklahoma / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 450, NWS Tulsa, OK
NWS Tulsa, OK issued this severe thunderstorm warning at Aug 26, 1999, 5:02 PM CDT for Mayes County, Oklahoma. It was in force for 43 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 26, 1999, 5:02 PM CDT (22:02 UTC)
- Expired
- Aug 26, 1999, 5:45 PM CDT
- In force
- 43 min
- Issued by
- NWS Tulsa, OK
- Area
- Whole counties
County Mayes County, OK
The radar
The Tulsa radar (KINX), 33 km from the middle of the area, began a volume at 22:05 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 26, 5:38 PM CDT | Hail 1 | Locust Grove, 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 26, 4:00 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
The nearest sounding before it
Springfield, MO (KSGF), launched 12:00Z, 10.0 hours before the alert went out and 144 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1427 m above ground
- 0-6 km bulk shear
- 29 kt
- 0-1 km storm-relative helicity
- 96 m²/s²
- 0-3 km storm-relative helicity
- 276 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
957 WUUS54 KTSA 262204 RRA SVRTUL OKC097-262245- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE TULSA OK 502 PM CDT THU AUG 26 1999 THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... SOUTHERN MAYES COUNTY IN NORTHEAST OKLAHOMA * UNTIL 545 PM CDT * AT 502 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 3 MILES NORTHEAST OF CHOUTEAU...MOVING EAST AT 20 MPH. * SOME LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE...SALINA... ROSE...LOCUST GROVE...CHOUTEAU AND PRYOR HAIL TO THE SIZE OF QUARTERS AND WIND GUSTS TO 65 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 26, 2:45 PM CDT, 2 hours 17 minutes earlier.
Area forecast discussion, Aug 26, 2:45 PM CDT, 2 hours 17 minutes before
EASTERN OKLAHOMA/NORTHWEST ARKANSAS FORECAST DISCUSSION NATIONAL WEATHER SERVICE TULSA OK 245 PM CDT THU AUG 26 1999 PROBLEM(S) OF THE DAY: POPS WILL THERE BE SEVERE CONVECTION? TEMPERATURES AN AREA OF SHOWERS AND THUNDERSTORMS CONTINUES TO MOVE SOUTHWARD INTO THE NORTHWEST CORNER OF ARKANSAS THIS AFTERNOON. THIS ACTIVITY IS AHEAD OF THE MAIN UPPER-LEVEL DISTURBANCE LOCATED OVER FAR SOUTHEAST NEBRASKA. IN ADDITION...MOST OF THE AREA IS APPROACHING CONVECTIVE TEMPERATURES NEAR 100 DEGREES WITH DEWPOINTS HOLDING IN THE MID 60S. SCATTERED STORMS SHOULD DEVELOP THIS AFTERNOON AND THIS EVENING MAINLY ACROSS NORTHEAST OKLAHOMA...WHERE OUTFLOW BOUNDARY FROM ACTIVITY IN NORTHWEST ARKANSAS SHOULD PROVIDE A GOOD FOCUS. DAMAGING DOWNBURST WINDS WILL BE POSSIBLE WITH THE STRONGER STORMS...GIVEN THE AMOUNT OF INSTABILITY AND ARID LOW-LEVEL AIRMASS. THEREFORE MAY NEED TO MENTION SEVERE IN THE ZONES ESPECIALLY SOUTH AND WEST OF THE OUTFLOW BOUNDARY. WILL GO WITH GOOD CHANCE POPS IN NORTHWEST ARKANSAS THIS EVENING WITH LESSER CHANCE POPS TO THE WEST AND SOUTH OF THIS AREA. MAY NEED TO GO WITH A HIGHER POP IN SOME ZONES DEPENDING ON RADAR TRENDS NEAR ZONE ISSUANCE TIME. THE ETA MODEL SEEMS TO HAVE THE BEST HANDLE ON THE ACTIVITY AND HAS GOOD FORCING WITH THE UPPER-LEVEL SYSTEM AS IT MOVES ACROSS THE AREA TONIGHT. THEREFORE...CONVECTION MAY CONTINUE THROUGHOUT THE NIGHT. THE ACTIVITY SHOULD SLIDE SOUTHWARD WITH TIME...BUT WILL LIKELY PERSIST INTO THE MORNING TOMORROW...ESPECIALLY ACROSS THE SOUTHERN HALF OF THE AREA. WILL KEEP POPS IN THE CHANCE CATEGORY ALONG AND SOUTH OF I-40 FOR TOMORROW. WITH CONSIDERABLE HEATING POSSIBLE AGAIN TOMORROW AHEAD OF THE CONVECTIVE ACTIVITY...THERE COULD BE ANOTHER CHANCE OF SEVERE WEATHER NEAR THE RED RIVER TOMORROW. TEMPERATURES WILL BE HIGHLY DEPENDENT ON PRECIPITATION...WHICH IS NOT HANDLED VERY WELL BY THE AVN OR NGM. THEREFORE WILL GO A BIT ABOVE GUIDANCE TONIGHT TO ACCOUNT FOR CLOUD COVER. WILL GO UNDER GUIDANCE FOR HIGHS TOMORROW IN THE SOUTH TO ACCOUNT FOR POSSIBLE PRECIPITATION...BUT IN THE ABSENCE OF PRECIPITATION TEMPERATURES SHOULD ONCE AGAIN BE HOT. SOUTHWESTERLY COMPONENT TO THE LOW-LEVEL FLOW WILL LIKELY BE CONFINED TO NEAR THE RED RIVER TOMORROW...SO THINGS SHOULD BE A BIT LESS HOT THAN TODAY. THERE IS CONSIDERABLE UNCERTAINTY IN THE FATE OF THE UPPER-LEVEL DISTURBANCE AFTER TOMORROW...BUT IT APPEARS THAT IT MAY HANG UP OR BEGIN TO SLIDE AROUND THE SOUTH SIDE OF THE UPPER HIGH OVER THE ROCKIES. IF THIS HAPPENS IT MAY REMAIN CLOSE ENOUGH TO THE RED RIVER TO KEEP A SLIGHT CHANCE POP IN FOR FAR SOUTHERN ZONES THROUGH SATURDAY EVENING. THE REST OF THE AREA SHOULD REMAIN DRY THROUGH THE EARLY PORTION OF NEXT WEEK. FWC AND FAN GUIDANCE IS SIMILAR FOR THIRD AND FOURTH PERIODS...AND SEE LITTLE REASON TO STRAY FAR FROM IT. THE EXTENDED FORECAST LOOKS DRY AND MAYBE JUST A BIT COOLER...BUT STILL WARMER THAN NORMAL IN MOST LOCATIONS. FCSTID = 19 TUL 75 97 74 97 / 40 20 0 5 FSM 73 95 71 97 / 30 40 5 10 MLC 71 97 71 99 / 30 40 5 10 BVO 72 97 71 97 / 40 10 0 5 FYV 68 92 66 94 / 50 20 0 5 BYV 68 92 66 94 / 50 20 0 5 MIO 70 95 67 95 / 50 20 0 5 MKO 75 97 74 97 / 40 20 0 5 F10 75 97 74 97 / 40 20 0 5 HHW 73 97 73 100 / 20 40 20 20 .TUL... AR...NONE. OK...NONE. -------------------- EXPERIMENTAL OUTPUT: HAZARDOUS WEATHER EXPECTED NEXT 24 HOURS: GOOD CHANCE SEVERE THUNDERSTORMS NGM CONFIDENCE: 5 ON A SCALE OF 0 TO 10 ETA CONFIDENCE: 8 ON A SCALE OF 0 TO 10 AVN CONFIDENCE: 5 ON A SCALE OF 0 TO 10 FCST CONFIDENCE: 8 ON A SCALE OF 0 TO 10
In the hours before
Special weather statement, Aug 26, 1:05 PM CDT, 3 hours 57 minutes before
ARZ001-002-010-011-019-020-029-OKZ049-053>076-271100- EASTERN OKLAHOMA/NORTHWEST ARKANSAS HAZARDOUS WEATHER OUTLOOK...UPDATED NATIONAL WEATHER SERVICE TULSA OK 105 PM CDT THU AUG 26 1999 ...ISOLATED SEVERE THUNDERSTORMS ARE POSSIBLE IN EASTERN OKLAHOMA AND NORTHWEST ARKANSAS THIS AFTERNOON AND TONIGHT... .SYNOPSIS... AN UPPER LEVEL DISTURBANCE OVER EASTERN NEBRASKA EARLY THIS AFTERNOON WILL DROP SOUTH THIS AFTERNOON...EVENTUALLY MOVING INTO EASTERN OKLAHOMA AND NORTHWEST ARKANSAS TONIGHT. A BROAD AREA OF SURFACE LOW PRESSURE WAS LOCATED OVER WESTERN KANSAS...WITH A WEAK SURFACE TROUGH EXTENDING ACROSS FAR EASTERN OKLAHOMA AND NORTHWEST ARKANSAS. .DISCUSSION... A COMPLEX OF SHOWERS AND THUNDERSTORMS WAS MOVING SOUTHEAST ACROSS SOUTHERN MISSOURI THIS AFTERNOON. STRONG HEATING WITH TEMPERATURES RISING TO THE 95 TO 102 DEGREE RANGE WILL COMBINE WITH DEWPOINTS IN THE MID TO UPPER 60S TO PRODUCE A VERY UNSTABLE ATMOSPHERE THIS AFTERNOON AND EARLY THIS EVENING. WEAK SURFACE CONVERGENCE COMBINED WITH THE INCREASING INSTABILITY MAY RESULT IN ADDITIONAL THUNDERSTORM DEVELOPMENT THIS AFTERNOON AND EARLY EVENING...MAINLY ACROSS FAR EASTERN OKLAHOMA AND NORTHWEST ARKANSAS. THE LARGE TEMPERATURE-DEWPOINT SPREAD AT THE SURFACE SUGGESTS THAT STRONG DAMAGING WINDS WOULD BE THE PRIMARY THREAT. SCATTERED THUNDERSTORMS ARE EXPECTED TONIGHT AS THE UPPER LEVEL DISTURBANCE APPROACHES. LESS INSTABILITY OVERNIGHT IS EXPECTED TO KEEP MOST STORMS BELOW SEVERE LIMITS. HOWEVER...ENOUGH FORCING ASSOCIATED WITH THE UPPER DISTURBANCE WILL BE SUFFICIENT TO SUPPORT AN ISOLATED SEVERE STORM TONIGHT...WITH DAMAGING WINDS THE PRIMARY THREAT. .SPOTTER ACTIVATION... DUE TO THE BRIEF AND ISOLATED NATURE OF THE POSSIBLE SEVERE WEATHER THREAT...SPOTTER ACTIVATION IS NOT ANTICIPATED. .OTHER HAZARDS... AN OZONE ALERT IS IN EFFECT THIS AFTERNOON FOR THE TULSA METROPOLITAN AREA. FOR MORE DETAIL...PLEASE REFER TO THE PUBLIC INFORMATION STATEMENT(OKCPNSTUL) ISSUED BY THIS OFFICE WEDNESDAY AFTERNOON.
Special weather statement, Aug 26, 1:05 PM CDT, 3 hours 57 minutes before
ARZ001-002-010-011-019-020-029-OKZ049-053>076-271100- EASTERN OKLAHOMA/NORTHWEST ARKANSAS HAZARDOUS WEATHER OUTLOOK...UPDATED NATIONAL WEATHER SERVICE TULSA OK 105 PM CDT THU AUG 26 1999 ...ISOLATED SEVERE THUNDERSTORMS ARE POSSIBLE IN EASTERN OKLAHOMA AND NORTHWEST ARKANSAS THIS AFTERNOON AND TONIGHT... .SYNOPSIS... AN UPPER LEVEL DISTURBANCE OVER EASTERN NEBRASKA EARLY THIS AFTERNOON WILL DROP SOUTH THIS AFTERNOON...EVENTUALLY MOVING INTO EASTERN OKLAHOMA AND NORTHWEST ARKANSAS TONIGHT. A BROAD AREA OF SURFACE LOW PRESSURE WAS LOCATED OVER WESTERN KANSAS...WITH A WEAK SURFACE TROUGH EXTENDING ACROSS FAR EASTERN OKLAHOMA AND NORTHWEST ARKANSAS. .DISCUSSION... A COMPLEX OF SHOWERS AND THUNDERSTORMS WAS MOVING SOUTHEAST ACROSS SOUTHERN MISSOURI THIS AFTERNOON. STRONG HEATING WITH TEMPERATURES RISING TO THE 95 TO 102 DEGREE RANGE WILL COMBINE WITH DEWPOINTS IN THE MID TO UPPER 60S TO PRODUCE A VERY UNSTABLE ATMOSPHERE THIS AFTERNOON AND EARLY THIS EVENING. WEAK SURFACE CONVERGENCE COMBINED WITH THE INCREASING INSTABILITY MAY RESULT IN ADDITIONAL THUNDERSTORM DEVELOPMENT THIS AFTERNOON AND EARLY EVENING...MAINLY ACROSS FAR EASTERN OKLAHOMA AND NORTHWEST ARKANSAS. THE LARGE TEMPERATURE-DEWPOINT SPREAD AT THE SURFACE SUGGESTS THAT STRONG DAMAGING WINDS WOULD BE THE PRIMARY THREAT. SCATTERED THUNDERSTORMS ARE EXPECTED TONIGHT AS THE UPPER LEVEL DISTURBANCE APPROACHES. LESS INSTABILITY OVERNIGHT IS EXPECTED TO KEEP MOST STORMS BELOW SEVERE LIMITS. HOWEVER...ENOUGH FORCING ASSOCIATED WITH THE UPPER DISTURBANCE WILL BE SUFFICIENT TO SUPPORT AN ISOLATED SEVERE STORM TONIGHT...WITH DAMAGING WINDS THE PRIMARY THREAT. .SPOTTER ACTIVATION... DUE TO THE BRIEF AND ISOLATED NATURE OF THE POSSIBLE SEVERE WEATHER THREAT...SPOTTER ACTIVATION IS NOT ANTICIPATED. .OTHER HAZARDS... AN OZONE ALERT IS IN EFFECT THIS AFTERNOON FOR THE TULSA METROPOLITAN AREA. FOR MORE DETAIL...PLEASE REFER TO THE PUBLIC INFORMATION STATEMENT(OKCPNSTUL) ISSUED BY THIS OFFICE WEDNESDAY AFTERNOON.
The office that day
Everything else NWS Tulsa, OK issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 26, 3:24 PM CDT | Severe Thunderstorm Warning | TSA | LeFlore | 51 min |
| Aug 26, 3:55 PM CDT | Severe Thunderstorm Warning | TSA | Wagoner | 50 min |
| Aug 26, 4:28 PM CDT | Severe Thunderstorm Warning | TSA | Rogers | 47 min |
| Aug 26, 4:41 PM CDT | Severe Thunderstorm Warning | TSA | Wagoner | 64 min |
| Aug 26, 5:44 PM CDT | Severe Thunderstorm Warning | TSA | Delaware, Mayes | 46 min |
| Aug 26, 6:30 PM CDT | Severe Thunderstorm Warning | TSA | Delaware | 45 min |
| Aug 26, 6:58 PM CDT | Severe Thunderstorm Warning | TSA | Osage | 62 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.