Alert archive / Oklahoma / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 402, NWS Tulsa, OK
NWS Tulsa, OK issued this severe thunderstorm warning at Jul 1, 1999, 10:02 AM CDT for Cherokee County, Oklahoma. It was in force for 43 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Jul 1, 1999, 10:02 AM CDT (15:02 UTC)
- Expired
- Jul 1, 1999, 10:45 AM CDT
- In force
- 43 min
- Issued by
- NWS Tulsa, OK
- Area
- Whole counties
County Cherokee County, OK
The radar
The Tulsa radar (KINX), 59 km from the middle of the area, began a volume at 15:01 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.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Jul 1, 8:15 AM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
The nearest sounding before it
Springfield, MO (KSGF), launched 12:00Z, 3.0 hours before the alert went out and 154 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
- 1227 J/kg
- Mixed-layer CIN
- -62 J/kg
- Mixed-layer LCL
- 839 m above ground
- 0-6 km bulk shear
- 36 kt
- 0-1 km storm-relative helicity
- 332 m²/s²
- 0-3 km storm-relative helicity
- 339 m²/s²
- Significant tornado parameter
- 1.6
- Supercell composite
- 9.7
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 Jul 1, 4:40 AM CDT, 5 hours 22 minutes earlier.
Area forecast discussion, Jul 1, 4:40 AM CDT, 5 hours 22 minutes before
EASTERN OKLAHOMA/NORTHWEST ARKANSAS FORECAST DISCUSSION NATIONAL WEATHER SERVICE TULSA OK 440 AM CDT THU JUL 1 1999 PROBLEMS OF THE DAY: WILL THERE BE SEVERE CONVECTION? HOW MUCH RAIN WILL FALL? TEMPERATURES SUMMER IS FINALLY COMING BUT NOT BEFORE ONE LAST HURRAH FROM MOTHER NATURE THIS MORNING. MESOSCALE CONVECTIVE SYSTEM STARTING TO BECOME ORGANIZED ACROSS SOUTHERN KANSAS AND IS LIKELY TO SOON EVOLVE INTO A FAST MOVING SQUALL LINE WHICH WILL RACE EAST SOUTHEAST ACROSS THE FORECAST AREA THIS MORNING. LOW LEVEL JET OF 30-40 KNOTS AND LAMONT PROFILER SHOWS MID LEVEL FLOW HAS INCREASED TO 55 KNOTS DURING THE PAST COUPLE HOURS WITH IMPRESSIVE VEERING SO PLETY OF REASONS TO SUPPORT THE SQUALL LINE BLASTING THROUGH MUCH OF THE AREA. THINK IT WILL FINALLY RUN OUT OF GAS ONCE IT PASSES MCALESTER AND FORT SMITH AS IT ENCOUNTERS WEAKER MID LEVEL FLOW AND A STRONGER CAP. GIVEN THE EXCESSIVE RAINS WHICH FELL WEDNESDAY MORNING AND THE POTENTIAL FOR A QUICK 1-2 INCHES THIS MORNING...WILL ISSUE A FLASH FLOOD WATCH FOR ALL AREAS EXCEPT FAR SOUTHEAST OKLAHOMA FOR THIS MORNING. WEAKENING MID LEVEL FLOW...RISING HEIGHTS ALOFT AND WARMING MID LEVEL TEMPERATURES SHOULD FINALLY LEAD TO AN EXTENDED DRY PERIOD AFTER TODAY. WILL KEEP SMALL POPS IN NORTHEAST OKLAHOMA AND NORTHWEST ARKANSAS TONIGHT ALTHOUGH THE MAIN ACTION SHOULD BE TO THE NORTH. WILL THEN HEAT THINGS UP OVER THE WEEKEND ALTHOUGH TEMPERATURES WILL BE HELD IN CHECK SOME DUE TO ALL THE RECENT RAIN AND RESULTANT LUSH VEGETATION. SLIM CHANCE FOR ISOLATED STORMS IN FAR SOUTHEAST OKLAHOMA BY THE END OF THE WEEKEND DUE TO A WEAKNESS IN THE UPPER RIDGE OVER THAT AREA BUT THE CHANCES LOOK TOO SLIM TO MENTION AT THIS POINT IN TIME. GUIDANCE TEMPERATURES LOOK REASONABLE AS THE RETURN OF SUNSHINE THIS AFTERNOON SHOULD RESULT IN A GOOD WARMUP AFTER THE MORNING RAINS. GUIDANCE POPS CONTINUE TO BE TOO LOW TODAY. FCSTID = 5 TUL 88 76 92 78 / 100 20 10 10 FSM 88 74 92 75 / 70 10 5 5 MLC 88 76 92 78 / 60 10 5 5 BVO 88 75 92 77 / 100 20 10 10 FYV 84 72 89 74 / 90 20 10 10 IDB 90 74 92 74 / 20 10 5 5 BYV 84 72 89 74 / 90 20 10 10 MIO 86 74 90 76 / 90 20 10 10 MKO 88 75 92 78 / 80 10 5 5 F10 88 76 92 78 / 80 10 5 5 HHW 90 76 92 77 / 20 10 5 5 .TUL... AR...FLASH FLOOD WATCH FOR THIS MORNING FOR ZONES ARZ001>002... ARZ010>011...ARZ019>020...ARZ029. OK...FLASH FLOOD WATCH FOR THIS MORNING FOR ZONES OKZ054>076. PLATE -------------------- EXPERIMENTAL OUTPUT: HAZARDOUS WEATHER EXPECTED NEXT 24 HOURS: GOOD CHANCE SEVERE THUNDERSTORMS NGM CONFIDENCE: 4 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: 7 ON A SCALE OF 0 TO 10
In the hours before
Special weather statement, Jul 1, 6:10 AM CDT, 3 hours 52 minutes before
ARZ001-002-010-011-019-020-029-OKZ049-053>076-021100- EASTERN OKLAHOMA/NORTHWEST ARKANSAS HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE TULSA OK 610 AM CDT THU JUL 1 1999 ...A SEVERE THUNDERSTORM WATCH IS IN EFFECT UNTIL 10 AM FOR OSAGE... PAWNEE AND CREEK COUNTIES IN NORTHEAST OKLAHOMA... ...A FLASH FLOOD WATCH IS IN EFFECT FOR THIS MORNING FOR MUCH OF EASTERN OKLAHOMA AND NORTHWEST ARKANSAS... ...A FEW SEVERE THUNDERSTORMS ARE EXPECTED OVER NORTHEAST OKLAHOMA THIS MORNING... .SYNOPSIS... EARLY THIS MORNING LOW PRESSURE WAS LOCATED OVER THE TEXAS AND OKLAHOMA PANHANDLES. A STRONG LOW LEVEL JET HAS DEVELOPED OVERNIGHT OVER THE SOUTHERN PLAINS AHEAD OF THIS FEATURE. THIS JET COMBINED WITH APPROACHING RELATIVELY STRONG WINDS IN THE MID LEVELS OF THE ATMOSPHERE WILL PROVIDE AN ENVIRONMENT FAVORABLE FOR SEVERE THUNDERSTORMS OVER NORTHEAST OKLAHOMA THIS MORNING. WIND FIELDS WILL WEAKEN SOMEWHAT THIS AFTERNOON AND TONIGHT AND WARMING MID LEVELS OF THE ATMOSPHERE WILL ACT TO SUPPRESS THE REDEVELOPMENT OF THUNDERSTORMS LATER IN THE DAY AND OVERNIGHT TONIGHT. .DISCUSSION... A COMPLEX OF STRONG TO SEVERE THUNDERSTORMS FORMED OVER SOUTHWEST KANSAS OVERNIGHT. THE LEADING EDGE OF THIS COMPLEX OF STORMS IS EXPECTED TO DEVELOP INTO A SQUALL LINE AND MOVE SOUTHEAST ACROSS EASTERN OKLAHOMA AND NORTHWEST ARKANSAS THIS MORNING. THE THUNDERSTORMS WILL LIKELY WEAKEN AS THEY CROSS THE AREA. HOWEVER...THEY WILL LIKELY REMAIN STRONG ENOUGH TO PRODUCE SOME DAMAGING WINDS AND MARGINALLY SEVERE HAIL ACROSS NORTHEAST OKLAHOMA . THE STORMS WILL ALSO BRING A PERIOD OF VERY HEAVY RAINFALL WHICH COMBINED WITH SOILS THAT ARE SATURATED FROM LAST MORNINGS RAIN COULD RESULT IN FLASH FLOODING. .EMERGENCY MANAGEMENT AGENCY AND SPOTTER ACTIVATION... CIVIL DEFENSE AGENCIES AND SPOTTER GROUPS OVER NORTHEAST OKLAHOMA SHOULD BE PREPARED FOR POSSIBLE ACTIVATION THIS MORNING. INFORMATION CONCERNING THE DEVELOPMENT OF FLASH FLOODING MAY BE NEEDED OVER THE WHOLE AREA.
Special weather statement, Jul 1, 6:10 AM CDT, 3 hours 52 minutes before
ARZ001-002-010-011-019-020-029-OKZ049-053>076-021100- EASTERN OKLAHOMA/NORTHWEST ARKANSAS HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE TULSA OK 610 AM CDT THU JUL 1 1999 ...A SEVERE THUNDERSTORM WATCH IS IN EFFECT UNTIL 10 AM FOR OSAGE... PAWNEE AND CREEK COUNTIES IN NORTHEAST OKLAHOMA... ...A FLASH FLOOD WATCH IS IN EFFECT FOR THIS MORNING FOR MUCH OF EASTERN OKLAHOMA AND NORTHWEST ARKANSAS... ...A FEW SEVERE THUNDERSTORMS ARE EXPECTED OVER NORTHEAST OKLAHOMA THIS MORNING... .SYNOPSIS... EARLY THIS MORNING LOW PRESSURE WAS LOCATED OVER THE TEXAS AND OKLAHOMA PANHANDLES. A STRONG LOW LEVEL JET HAS DEVELOPED OVERNIGHT OVER THE SOUTHERN PLAINS AHEAD OF THIS FEATURE. THIS JET COMBINED WITH APPROACHING RELATIVELY STRONG WINDS IN THE MID LEVELS OF THE ATMOSPHERE WILL PROVIDE AN ENVIRONMENT FAVORABLE FOR SEVERE THUNDERSTORMS OVER NORTHEAST OKLAHOMA THIS MORNING. WIND FIELDS WILL WEAKEN SOMEWHAT THIS AFTERNOON AND TONIGHT AND WARMING MID LEVELS OF THE ATMOSPHERE WILL ACT TO SUPPRESS THE REDEVELOPMENT OF THUNDERSTORMS LATER IN THE DAY AND OVERNIGHT TONIGHT. .DISCUSSION... A COMPLEX OF STRONG TO SEVERE THUNDERSTORMS FORMED OVER SOUTHWEST KANSAS OVERNIGHT. THE LEADING EDGE OF THIS COMPLEX OF STORMS IS EXPECTED TO DEVELOP INTO A SQUALL LINE AND MOVE SOUTHEAST ACROSS EASTERN OKLAHOMA AND NORTHWEST ARKANSAS THIS MORNING. THE THUNDERSTORMS WILL LIKELY WEAKEN AS THEY CROSS THE AREA. HOWEVER...THEY WILL LIKELY REMAIN STRONG ENOUGH TO PRODUCE SOME DAMAGING WINDS AND MARGINALLY SEVERE HAIL ACROSS NORTHEAST OKLAHOMA . THE STORMS WILL ALSO BRING A PERIOD OF VERY HEAVY RAINFALL WHICH COMBINED WITH SOILS THAT ARE SATURATED FROM LAST MORNINGS RAIN COULD RESULT IN FLASH FLOODING. .EMERGENCY MANAGEMENT AGENCY AND SPOTTER ACTIVATION... CIVIL DEFENSE AGENCIES AND SPOTTER GROUPS OVER NORTHEAST OKLAHOMA SHOULD BE PREPARED FOR POSSIBLE ACTIVATION THIS MORNING. INFORMATION CONCERNING THE DEVELOPMENT OF FLASH FLOODING MAY BE NEEDED OVER THE WHOLE AREA.
The office that day
Everything else NWS Tulsa, OK issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 1, 7:42 AM CDT | Severe Thunderstorm Warning | TSA | Osage, Pawnee | 48 min |
| Jul 1, 8:13 AM CDT | Severe Thunderstorm Warning | TSA | Creek | 62 min |
| Jul 1, 8:24 AM CDT | Severe Thunderstorm Warning | TSA | Osage, Pawnee | 36 min |
| Jul 1, 8:32 AM CDT | Severe Thunderstorm Warning | TSA | Tulsa, Washington | 58 min |
| Jul 1, 8:53 AM CDT | Severe Thunderstorm Warning | TSA | Nowata, Rogers | 52 min |
| Jul 1, 9:18 AM CDT | Severe Thunderstorm Warning | TSA | Delaware, Ottawa | 42 min |
| Jul 1, 9:48 AM CDT | Severe Thunderstorm Warning | TSA | Delaware, Ottawa | 42 min |
| Jul 1, 10:17 AM CDT | Severe Thunderstorm Warning | TSA | Adair | 43 min |
| Jul 1, 10:19 AM CDT | Severe Thunderstorm Warning | TSA | Osage | 41 min |
| Jul 1, 10:44 AM CDT | Severe Thunderstorm Warning | TSA | Pawnee | 46 min |
| Jul 1, 10:56 AM CDT | Severe Thunderstorm Warning | TSA | Osage | 34 min |
| Jul 1, 11:25 AM CDT | Severe Thunderstorm Warning | TSA | Tulsa | 50 min |
| Jul 1, 11:29 AM CDT | Severe Thunderstorm Warning | TSA | Osage | 16 min |
| Jul 1, 11:54 AM CDT | Severe Thunderstorm Warning | TSA | Rogers, Wagoner | 51 min |
| Jul 1, 10:05 AM CDT | Severe Thunderstorm Warning | TSA | Benton | 55 min |
| Jul 1, 10:34 AM CDT | Flash Flood Warning | TSA | Benton | 116 min |
| Jul 1, 11:15 AM CDT | Flash Flood Warning | TSA | Carroll | 2 hr |
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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.