Alert archive / Oklahoma / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 79, NWS Tulsa, OK
NWS Tulsa, OK issued this severe thunderstorm warning at Apr 3, 1999, 6:00 AM CST for Choctaw County, Oklahoma. It was in force for 45 min. 1 report came from inside the area while it was in force.
The area
The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties, with what was reported inside it.
The facts
- Issued
- Apr 3, 1999, 6:00 AM CST (12:00 UTC)
- Expired
- Apr 3, 1999, 6:45 AM CST
- In force
- 45 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), 190 km from the middle of the area, began a volume at 11:59 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 |
|---|---|---|---|
| Apr 3, 6:10 AM CST | Thunderstorm Wind | Hugo, OK | A tree was blown down onto a fence. |
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
Fort Worth, TX (KFWD), launched 12:00Z, 0.0 hours before the alert went out and 195 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
- 841 J/kg
- Mixed-layer CIN
- -35 J/kg
- Mixed-layer LCL
- 918 m above ground
- 0-6 km bulk shear
- 33 kt
- 0-1 km storm-relative helicity
- 29 m²/s²
- 0-3 km storm-relative helicity
- 101 m²/s²
- Significant tornado parameter
- 0.4
- Supercell composite
- 2.6
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KTUL 031200 RRA SVRTUL OKC023-031245- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE TULSA OK 600 AM CST SAT APR 3 1999 THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... CHOCTAW COUNTY IN SOUTHEAST OKLAHOMA * UNTIL 645 AM CST * AT 600 AM CST A SEVERE THUNDERSTORM WAS LOCATED 6 MILES SOUTHEAST OF BOSWELL...MOVING NORTHEAST AT 45 MPH. * SOME LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE... KENT... MESSER...SOPER...BOSWELL AND HUGO HAIL TO THE SIZE OF NICKELS AND WIND GUSTS TO 60 MPH CAN BE EXPECTED IN THE WARNED AREA. LAT...LON 3394 9599 3382 9583 3416 9523 3420 9563
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 Apr 3, 5:00 AM CST, 1 hour earlier.
Area forecast discussion, Apr 3, 5:00 AM CST, 1 hour before
EASTERN OKLAHOMA/NORTHWEST ARKANSAS FORECAST DISCUSSION NATIONAL WEATHER SERVICE TULSA OK 500 AM CST SAT APR 3 1999 PROBLEM(S) OF THE DAY: WILL SEVERE WEATHER RE-DEVELOP THIS AFTERNOON? WHAT AFFECT WILL CONVECTION HAVE ON TEMPERATURES? ZONES HAVE ALREADY BEEN SENT. SEVERE WEATHER IS ONGOING AS SQUALL LINE PUSHES OFF TO THE EAST AND OTHER CONVECTION FIRED UP EARLIER IN NW AR AHEAD OF THE SQUALL LINE. LOOKS LIKE THE EASTERLY VALLEY WIND NEAR FSM INCREASED STORM RELATIVE HELICITY AND CAUSED SOME OF THESE STORMS...PARTICULARLY AROUND CRAWFORD COUNTY TO ROTATE. SQUALL LINE SHOULD CLEAR THE ERN EDGE OF THE FCST AREA BETWEEN 600 AND 700 AM. SURFACE ANALYSIS SHOWS THAT DRYLINE REMAINS OVER THE TX PNHDL. NGM AND AVN AGREE IN SURGING THE DRYLINE EAST TODAY. BY MID-AFTERNOON...DAYTIME HEATING MAY HAVE ALLOWED THE ATMOSPHERE TO RECOVER FROM ONGOING CONVECTION AND ALLOW TSRA RE-DEVELOPMENT ALONG THE DRYLINE IN ERN OK. THIS NEW FCST ASSUMES THAT RE-DEVELOPMENT WILL TAKE PLACE ALONG/EAST OF U.S. HWY 69...OR ROUGHLY FROM MIAMI TO MCALESTER. ONGOING CONVECTION HAS PRODUCED AN OUTFLOW BOUNDARY IN ITS WAKE ALONG I-35. BACKED SURFACE WINDS ASSOCIATED WITH THIS OUTFLOW COULD INCREASE STORM-RELATIVE HELICITIES AND ALLOW ANY STORMS THAT FORM TO ROTATE. DAY SHIFT WILL WANT TO KEEP TABS ON MESOSCALE DEVELOPMENTS. MUCH OF THIS REMAINS OPEN TO DEBATE 12 HOURS OUT FROM THE FACT. ANY AFTN CONVECTION SHOULD MOVE EAST OF THE FCST AREA BY MID-EVNG. IT IS UNUSUAL TO SEE A DRYLINE MOVE EAST OF THE OK/AR STATE LINE...BUT MODELS INDICATE THIS WILL HAPPEN DURG THE EVNG. THIS WILL LEAVE A CLEAR AND DRY ATMOS BEHIND WITH GOOD RADIATIONAL COOLING TONIGHT...SO WENT BELOW GUIDANCE TEMPS. EASTER MRNG SUNRISE LOOKS CLEAR AND SEASONABLY COOL...BASICALLY DELIGHTFUL. WITH SUNNY SKIES...HIGH TEMPS ON EASTER SHOULD WARM UP NICELY. WENT A DEGREE OR TWO OVER GUIDANCE. HOWEVER...MOISTURE WILL LURK JUST SOUTH OF THE RED RIVER AND SHOULD MAKE A RAPID RETURN ON SUN NGT AHEAD OF NEXT POWERFUL STORM NOW DIVING SOUTHWARD THRU NRN CA. STRONG MOISTURE ADVECTION...STRONG ISENTROPIC LIFT...AND MODERATE ELEVATED CONVECTION SHOULD PRODUCE THE LIKELIHOOD OF RAPID PCPN DEVELOPMENT SUN NGT. UPR SYS MOVES RAPIDLY BY ON MON MRNG WITH ANOTHER DRYLINE SURGING ACROSS THE AREA. THIS SHOULD CLEAR THINGS OUT AGAIN LATE MON AFTN/ERLY MON EVNG. THE LAST IN A SERIES OF UPR SYSTEMS IS CURRENTLY OVER THE BERING STRAITS NEAR AK AND WILL MOVE ACRS THE AREA ON WED NGT. ADDED SMALL POPS TO FCST ON WED...BUT THINK THAT MAIN TSRA THREAT WILL BE ON WED NGT/THU MRNG. FCSTID = 22 TUL 74 46 73 57 / 60 10 5 70 FSM 72 47 75 55 / 90 40 0 70 MLC 76 45 74 58 / 70 20 5 70 BVO 73 45 73 55 / 60 10 5 70 FYV 69 45 74 55 / 90 40 0 60 IDB 75 48 74 62 / 80 30 5 70 BYV 68 45 75 54 / 90 40 0 60 MIO 73 44 74 54 / 80 20 0 60 MKO 75 45 74 56 / 80 20 5 70 F10 75 45 73 57 / 70 10 5 70 HHW 75 47 74 61 / 70 30 5 70 .TUL... OK...SEVERE THUNDERSTORM WATCH UNTIL 900 AM CST FOR ZONES OKZ056>058...OKZ061>063...OKZ067>072...OKZ074. AR...SEVERE THUNDERSTORM WATCH UNTIL 900 AM CST FOR ZONES ARZ001>002...ARZ010>011...ARZ019>020...ARZ029. -------------------- EXPERIMENTAL OUTPUT: HAZARDOUS WEATHER EXPECTED NEXT 24 HOURS: SEVERE THUNDERSTORMS NGM CONFIDENCE: 7 ON A SCALE OF 0 TO 10 ETA CONFIDENCE: 5 ON A SCALE OF 0 TO 10 AVN CONFIDENCE: 8 ON A SCALE OF 0 TO 10 FCST CONFIDENCE: 8 ON A SCALE OF 0 TO 10
In the hours before
Local storm report, Apr 3, 3:52 AM CST, 2 hours 8 minutes before
STORM REPORT CORRECTED ...CORRECTED FOR TIME...
NATIONAL WEATHER SERVICE TULSA, OK
352 AM CST SAT APR 03 1999
TIME(CST) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0344 AM BIXBY OK .75 INCH HAIL
04/03/99 TULSA
0344 AM BIXBY OK 60 MPH TSTM GUST
04/03/99 TULSALocal storm report, Apr 3, 4:02 AM CST, 1 hour 58 minutes before
STORM REPORT CORRECTED ...CORRECTED FOR TIME...
NATIONAL WEATHER SERVICE TULSA, OK
402 AM CST SAT APR 03 1999
TIME(CST) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0359 AM BARTLESVILLE OK WIND DAMAGE
04/03/99 WASHINGTON WINDOW BLOWN OUT OF A
HOUSELocal storm report, Apr 3, 4:16 AM CST, 1 hour 44 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
416 AM CST SAT APR 03 1999
TIME(CST) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0306 AM BRISTOW OK 60 MPH TSTM GUST
04/03/99 CREEKLocal storm report, Apr 3, 4:18 AM CST, 1 hour 42 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
418 AM CST SAT APR 03 1999
TIME(CST) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0306 AM MANNFORD OK 60 MPH TSTM GUST
04/03/99 CREEK
0306 AM MANNFORD OK .75 INCH HAIL
04/03/99 CREEKSpecial weather statement, Apr 3, 6:00 AM CST, 0 minutes before
ARZ001-002-010-011-019-020-029-OKZ049-053>076-041200- EASTERN OKLAHOMA/NORTHWEST ARKANSAS HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE TULSA OK 600 AM CST SAT APR 3 1999 ...A FEW SEVERE THUNDERSTORMS ARE EXPECTED OVER SOUTHEAST OKLAHOMA AND NORTHWEST ARKANSAS THIS MORNING... ...ISOLATED SEVERE THUNDERSTORMS ARE POSSIBLE AGAIN THIS AFTERNOON AND INTO THE EARLY EVENING OVER FAR EASTERN OKLAHOMA AND NORTHWEST ARKANSAS... .SYNOPSIS... AT 600 AM...A LINE OF STRONG TO SEVERE THUNDERSTORMS EXTENDED FROM NEAR FAYETTEVILLE IN NORTHWEST ARKANSAS TO HUGO IN FAR SOUTHEAST OKLAHOMA. THIS LINE OF THUNDERSTORMS EXISTED WELL AHEAD OF A COLD FRONT THAT STRETCHED FROM SOUTHEAST KANSAS INTO SOUTHWEST OKLAHOMA. IN ADDITION...A DRY LINE EXTENDED FROM NEAR THE OKLAHOMA CITY AREA SOUTHWARD INTO CENTRAL TEXAS. .DISCUSSION... THE LINE OF THUNDERSTORMS OVER NORTHWEST ARKANSAS AND SOUTHEAST OKLAHOMA IS EXPECTED TO SHIFT EAST OF THE AREA BY 9 AM. WHILE A SLOW WEAKENING TREND IS EXPECTED...WIND GUSTS OF 60 MPH AND DIME SIZE HAIL WILL REMAIN POSSIBLE WITH THIS LINE OF STORMS. MEANWHILE...A STRONG UPPER LEVEL DISTURBANCE OVER NEW MEXICO EARLY THIS MORNING WILL SWING INTO THE TEXAS PANHANDLE AND WESTERN OKLAHOMA BY LATE MORNING OR EARLY AFTERNOON. THIS WILL AID IN PUSHING THE COLD FRONT/DRYLINE COMBINATION EASTWARD INTO EASTERN OKLAHOMA. CLEARING WILL BE SLOW BEHIND THE INITIAL LINE OF THUNDERSTORMS...BUT ENOUGH AFTERNOON HEATING IS EXPECTED FOR THE ATMOSPHERE TO BECOME MODERATELY UNSTABLE. SURFACE BASED CONVERGENCE ALONG THE COLD FRONT OR DRYLINE...COMBINED WITH INCREASING INSTABILITY MAY LEAD TO THE REDEVELOPMENT OF THUNDERSTORMS THIS AFTERNOON ACROSS FAR EASTERN OKLAHOMA. THIS ACTIVITY IS EXPECTED TO DEVELOP MAINLY EAST OF HIGHWAY 69...OR EAST OF A VINITA TO MUSKOGEE TO MCALESTER LINE. ANY CONVECTION THAT FORMS WOULD SHIFT EAST INTO NORTHWEST ARKANSAS BY LATE AFTERNOON OR EARLY EVENING. WHILE SOME STORM ROTATION IS POSSIBLE...FORECAST WIND PROFILES SUGGEST THAT STRONG WINDS WILL BE THE PRIMARY SEVERE WEATHER THREAT. .EMERGENCY AGENCY AND SPOTTER ACTIVATION... SPOTTERS ACTIVATION MAY BE REQUIRED AGAIN BY THIS AFTERNOON. SPOTTER GROUPS AND EMERGENCY MANAGEMENT AGENCIES ARE URGED TO LISTEN TO LATER FORECASTS INCLUDING THE UPDATED HAZARDOUS WEATHER OUTLOOK TO BE ISSUED AROUND 1 PM.
Special weather statement, Apr 3, 6:00 AM CST, 0 minutes before
ARZ001-002-010-011-019-020-029-OKZ049-053>076-041200- EASTERN OKLAHOMA/NORTHWEST ARKANSAS HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE TULSA OK 600 AM CST SAT APR 3 1999 ...A FEW SEVERE THUNDERSTORMS ARE EXPECTED OVER SOUTHEAST OKLAHOMA AND NORTHWEST ARKANSAS THIS MORNING... ...ISOLATED SEVERE THUNDERSTORMS ARE POSSIBLE AGAIN THIS AFTERNOON AND INTO THE EARLY EVENING OVER FAR EASTERN OKLAHOMA AND NORTHWEST ARKANSAS... .SYNOPSIS... AT 600 AM...A LINE OF STRONG TO SEVERE THUNDERSTORMS EXTENDED FROM NEAR FAYETTEVILLE IN NORTHWEST ARKANSAS TO HUGO IN FAR SOUTHEAST OKLAHOMA. THIS LINE OF THUNDERSTORMS EXISTED WELL AHEAD OF A COLD FRONT THAT STRETCHED FROM SOUTHEAST KANSAS INTO SOUTHWEST OKLAHOMA. IN ADDITION...A DRY LINE EXTENDED FROM NEAR THE OKLAHOMA CITY AREA SOUTHWARD INTO CENTRAL TEXAS. .DISCUSSION... THE LINE OF THUNDERSTORMS OVER NORTHWEST ARKANSAS AND SOUTHEAST OKLAHOMA IS EXPECTED TO SHIFT EAST OF THE AREA BY 9 AM. WHILE A SLOW WEAKENING TREND IS EXPECTED...WIND GUSTS OF 60 MPH AND DIME SIZE HAIL WILL REMAIN POSSIBLE WITH THIS LINE OF STORMS. MEANWHILE...A STRONG UPPER LEVEL DISTURBANCE OVER NEW MEXICO EARLY THIS MORNING WILL SWING INTO THE TEXAS PANHANDLE AND WESTERN OKLAHOMA BY LATE MORNING OR EARLY AFTERNOON. THIS WILL AID IN PUSHING THE COLD FRONT/DRYLINE COMBINATION EASTWARD INTO EASTERN OKLAHOMA. CLEARING WILL BE SLOW BEHIND THE INITIAL LINE OF THUNDERSTORMS...BUT ENOUGH AFTERNOON HEATING IS EXPECTED FOR THE ATMOSPHERE TO BECOME MODERATELY UNSTABLE. SURFACE BASED CONVERGENCE ALONG THE COLD FRONT OR DRYLINE...COMBINED WITH INCREASING INSTABILITY MAY LEAD TO THE REDEVELOPMENT OF THUNDERSTORMS THIS AFTERNOON ACROSS FAR EASTERN OKLAHOMA. THIS ACTIVITY IS EXPECTED TO DEVELOP MAINLY EAST OF HIGHWAY 69...OR EAST OF A VINITA TO MUSKOGEE TO MCALESTER LINE. ANY CONVECTION THAT FORMS WOULD SHIFT EAST INTO NORTHWEST ARKANSAS BY LATE AFTERNOON OR EARLY EVENING. WHILE SOME STORM ROTATION IS POSSIBLE...FORECAST WIND PROFILES SUGGEST THAT STRONG WINDS WILL BE THE PRIMARY SEVERE WEATHER THREAT. .EMERGENCY AGENCY AND SPOTTER ACTIVATION... SPOTTERS ACTIVATION MAY BE REQUIRED AGAIN BY THIS AFTERNOON. SPOTTER GROUPS AND EMERGENCY MANAGEMENT AGENCIES ARE URGED TO LISTEN TO LATER FORECASTS INCLUDING THE UPDATED HAZARDOUS WEATHER OUTLOOK TO BE ISSUED AROUND 1 PM.
The office that day
Everything else NWS Tulsa, OK issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 3, 2:32 AM CST | Severe Thunderstorm Warning | TSA | Creek, Osage, Pawnee | 58 min |
| Apr 3, 3:11 AM CST | Severe Thunderstorm Warning | TSA | Okfuskee, Okmulgee, Tulsa | 49 min |
| Apr 3, 3:11 AM CST | Severe Thunderstorm Warning | TSA | Washington | 49 min |
| Apr 3, 3:32 AM CST | Severe Thunderstorm Warning | TSA | Osage | 28 min |
| Apr 3, 3:47 AM CST | Severe Thunderstorm Warning | TSA | Muskogee, Wagoner | 43 min |
| Apr 3, 3:47 AM CST | Severe Thunderstorm Warning | TSA | Rogers | 43 min |
| Apr 3, 4:04 AM CST | Severe Thunderstorm Warning | TSA | Nowata, Washington | 41 min |
| Apr 3, 4:23 AM CST | Severe Thunderstorm Warning | TSA | Craig, Mayes | 37 min |
| Apr 3, 4:23 AM CST | Severe Thunderstorm Warning | TSA | Cherokee, Muskogee, Wagoner | 37 min |
| Apr 3, 4:23 AM CST | Severe Thunderstorm Warning | TSA | McIntosh | 37 min |
| Apr 3, 4:47 AM CST | Severe Thunderstorm Warning | TSA | Delaware, Ottawa | 58 min |
| Apr 3, 5:13 AM CST | Severe Thunderstorm Warning | TSA | Latimer | 62 min |
| Apr 3, 6:12 AM CST | Flash Flood Warning | TSA | Pushmataha | 3 hr |
| Apr 3, 6:59 AM CST | Flash Flood Warning | TSA | Latimer, LeFlore | 3 hr |
| Apr 3, 7:42 AM CST | Severe Thunderstorm Warning | TSA | LeFlore | 48 min |
| Apr 3, 10:06 AM CST | Severe Thunderstorm Warning | TSA | Okfuskee | 39 min |
| Apr 3, 10:25 AM CST | Severe Thunderstorm Warning | TSA | Pittsburg, Pushmataha | 65 min |
| Apr 3, 11:06 AM CST | Severe Thunderstorm Warning | TSA | Latimer, Pushmataha | 39 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.