Alert archive / Oklahoma / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 89, NWS Tulsa, OK
NWS Tulsa, OK issued this severe thunderstorm warning at Apr 4, 1999, 5:42 PM CDT for Latimer County, Oklahoma. It was in force for 33 min. No storm report in the archive falls 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.
The facts
- Issued
- Apr 4, 1999, 5:42 PM CDT (22:42 UTC)
- Expired
- Apr 4, 1999, 6:15 PM CDT
- In force
- 33 min
- Issued by
- NWS Tulsa, OK
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
County Latimer County, OK
The radar
The Western Arkansas radar (KSRX), 91 km from the middle of the area, began a volume at 22:43 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 nearest sounding before it
Norman, OK (KOUN), launched 12:00Z, 10.7 hours before the alert went out and 205 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
- 3861 m above ground
- 0-6 km bulk shear
- 65 kt
- 0-1 km storm-relative helicity
- 64 m²/s²
- 0-3 km storm-relative helicity
- 125 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
999 WUUS54 KTSA 042243 RRA SVRTUL OKC077-042315- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE TULSA OK 542 PM CDT SUN APR 4 1999 THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... LATIMER COUNTY IN SOUTHEAST OKLAHOMA * UNTIL 615 PM CDT * AT 542 PM CDT A SEVERE THUNDERSTORM WAS LOCATED 20 MILES SOUTH OF BENGAL...MOVING NORTH AT 45 MPH. * SOME LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE... RED OAK AND BENGAL HAIL TO THE SIZE OF QUARTERS AND WIND GUSTS TO 60 MPH CAN BE EXPECTED IN THE WARNED AREA. BE ALERT FOR RAPIDLY CHANGING WEATHER CONDITIONS AS STORMS APPROACH. LAT...LON 3469 9533 3469 9509 3506 9500 3505 9523
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 4, 3:55 PM CDT, 1 hour 47 minutes earlier.
Area forecast discussion, Apr 4, 3:55 PM CDT, 1 hour 47 minutes before
EASTERN OKLAHOMA/NORTHWEST ARKANSAS FORECAST DISCUSSION NATIONAL WEATHER SERVICE TULSA OK 355 PM CDT SUN APR 4 1999 PROBLEMS OF THE DAY: WILL THERE BE SEVERE CONVECTION? WILL THE CONVECTION BE SCATTERED OR NUMEROUS? WHAT TYPE(S) OF SEVERE WEATHER WILL OCCUR? TEMPERATURES LOOKS LIKE A LONG NEXT 24 HOURS AHEAD OF US AS ANOTHER MAJOR SEVERE WEATHER EVENT UNFOLDS ACROSS THE COUNTY WARNING AREA. INGREDIENTS ALREADY COMING TOGETHER AS PLANNED LATE THIS AFTERNOON WITH THE AVN MODEL LOOKING RIGHT ON TARGET SO WILL CONTINUE TO UTILIZE THIS MODEL FOR THE DETAILS. DEEPER MOISTURE EVIDENT ON VISIBLE SATELLITE IMAGERY IS SURGING NORTH INTO SOUTHEAST OKLAHOMA NOW AND SHOULD OVERSPREAD THE AREA THIS EVENING. WARM FRONT ACROSS TEXAS AND LOUISIANA WILL CONTINUE LIFTING NORTH OVERNIGHT AS WELL. GOOD ACCAS FIELD PRESENT IN STRONG ISENTROPIC LIFT ACROSS NORTHERN AND WESTERN OKLAHOMA AT THIS TIME WITH A FEW SHOWERS AND EVEN ISOLATED EMBEDDED THUNDERSTORMS OCCURRING WITHIN THIS AREA. CONVECTION SHOULD REALLY TAKE OFF THIS EVENING AS THE DEEPER MOISTURE OVERSPREADS THIS AREA OF STRONG ISENTROPIC LIFT. ALREADY SEEING STRONG STORMS APPROCHING FAR SOUTHEAST OKLAHOMA AT THIS TIME. WE MAY SEE A TEMPORARY BREAK IN THE ACTION FOR A FEW HOURS LATER TONIGHT OR AT LEAST SEE THE COVERAGE OF STORMS DIMINISH. HOWEVER AS THE UPPER SYSTEM HEADS OUR WAY AND SURFACE LOW ORGANIZES TO OUR WEST...A SHARPENING DRYLINE WILL BEGIN TO PUNCH OUT OF THE PANHANDLES AND A SQUALL LINE WILL DEVELOP ALONG THIS FEATURE LATER TONIGHT. THE SQUALL LINE SHOULD BE ENTERING OUR AREA BY AROUND 12Z GIVE OR TAKE A COUPLE HOURS AND WILL THEN MARCH ACROSS THE AREA DURING THE DAY MONDAY. WIND PROFILES ARE QUITE IMPRESSIVE WITH THIS SYSTEM...MUCH MORE SO THAN THEY WERE WITH THE SYSTEM YESTERDAY. SO SUPERCELLULAR STORMS AND STORM ROTATION WILL BE A GOOD BET WITH ANY STORMS AHEAD OF THE SQUALL LINE AND WITH ANY LEWPS EMBEDDED IN THE SQUALL LINE. INSTABILITY LOOKS TO BE SLIGHTLY LESS THAN WITH THE PREVIOUS SYSTEM BUT STILL MORE THAN SUFFICIENT GIVEN THE STRONG DYNAMICS. SKIES SHOULD CLEAR RAPIDLY LATE MONDAY OR MONDAY EVENING AND THEN TRANQUIL WEATHER WILL PREVAIL UNTIL THE NEXT MAJOR SYSTEM BEGINS AFFECTING US LATER WEDNESDAY NIGHT. SINCE THE EFFECTS OF THIS SYSTEM WILL NOT BE FELT UNTIL AFTER THE SUN HAS SET WEDNESDAY...WILL ONLY INCLUDE POPS IN THE THURSDAY PORTION OF THE EXTENDED. GUIDANCE TEMPERATURES TOO COOL TONIGHT BUT REASONABLE THEREAFTER. AVN MOS POPS ARE FAR SUPERIOR TO THE NGM MOS AS THE NGM IS DOING A WOEFUL JOB WITH THE MOISTURE RETURN. AVN POPS ARE TOO LOW MONDAY THOUGH. FCSTID = 5 TUL 59 68 46 74 / 100 100 0 0 FSM 61 74 47 76 / 100 100 10 0 MLC 62 69 45 76 / 100 100 0 0 BVO 58 68 46 74 / 100 100 0 0 FYV 57 70 44 72 / 100 100 10 0 IDB 65 76 48 77 / 100 100 10 0 BYV 56 71 44 72 / 100 100 10 0 MIO 57 69 44 72 / 100 100 0 0 MKO 59 70 46 74 / 100 100 0 0 F10 59 68 46 74 / 100 100 0 0 HHW 64 76 47 77 / 100 100 10 0 .TUL... OK...NONE. AR...NONE. PLATE -------------------- EXPERIMENTAL OUTPUT: HAZARDOUS WEATHER EXPECTED NEXT 24 HOURS: CHANCE SEVERE THUNDERSTORMS NGM CONFIDENCE: 6 ON A SCALE OF 0 TO 10 ETA CONFIDENCE: 8 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
Special weather statement, Apr 4, 1:00 PM CDT, 4 hours 42 minutes before
ARZ001-002-010-011-019-020-029-OKZ049-053>076-051200- EASTERN OKLAHOMA/NORTHWEST ARKANSAS HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE TULSA OK 100 PM CDT SUN APR 4 1999 ...A FEW SEVERE THUNDERSTORMS ARE EXPECTED EASTERN OKLAHOMA AND NORTHWEST ARKANSAS TONIGHT... .SYNOPSIS... A STRONG UPPER LEVEL LOW PRESSURE SYSTEM OVER SOUTHERN ARIZONA THIS AFTERNOON WILL MOVE INTO NORTHEASTERN NEW MEXICO BY MONDAY MORNING. AT THE SURFACE...LOW PRESSURE WILL MOVE OUT OF NEW MEXICO AND BECOME BETTER ORGANIZED OVER THE TEXAS AND OKLAHOMA PANHANDLES BY MORNING. EARLY TOMORROW MORNING A DRYLINE WILL EXTEND SOUTHWARD FROM THE LOW AND A WARM FRONT WILL EXTEND EASTWARD ACROSS NORTHERN OKLAHOMA. .DISCUSSION... EARLY THIS AFTERNOON...CONSIDERABLE LOW-LEVEL MOISTURE WAS PRESENT OVER SOUTHEASTERN TEXAS. AS THE SURFACE LOW DEVELOPS AND MOVES CLOSER TO THE AREA...SOUTHEASTERLY LOW-LEVEL WINDS ARE EXPECTED TO INCREASE THROUGHOUT THE REGION...BRINGING A RAPID RETURN OF MOISTURE AND CLOUD COVER TO THE AREA LATE THIS AFTERNOON AND TONIGHT. STRONG LIFT AHEAD OF THE UPPER- LEVEL SYSTEM...COUPLED WITH THE MOISTURE RETURN WILL ALLOW FOR SCATTERED THUNDERSTORM DEVELOPMENT ACROSS THE ENTIRE AREA POSSIBLY AS EARLY AS 5 PM THIS AFTERNOON...AND CONTINUING THROUGHOUT THE NIGHT. GIVEN THE DEGREE OF INSTABILITY AND LIFT...SOME OF THESE STORMS MAY BECOME SEVERE WITH LARGE HAIL BEING THE PRIMARY THREAT. AS THE WARM FRONT MOVES NORTHWARD ACROSS THE AREA LATER TONIGHT...WIND FIELDS WILL BECOME FAVORABLE FOR TORNADIC SUPERCELLS NEAR THE BOUNDARY. SCATTERED SEVERE STORMS MAY PERSIST ACROSS THE AREA FOR MOST OF THE NIGHT. HOWEVER...BY LATE TONIGHT A SQUALL LINE IS EXPECTED TO DEVELOP ALONG THE DRYLINE OVER WESTERN OKLAHOMA. THIS LINE OF POTENTIALLY SEVERE THUNDERSTORMS WILL LIKELY SWEEP ACROSS THE AREA TOMORROW MORNING. STRONG STRAIGHT-LINE WINDS ASSOCIATED WITH THE SQUALL-LINE MAY APPROACH AREAS TO THE WEST OF A BARTLESVILLE TO TULSA TO MCALESTER LINE BY DAYBREAK. .EMERGENCY AGENCY AND SPOTTER ACTIVATION... STORM SPOTTER GROUPS AND EMERGENCY MANAGEMENT AGENCIES THROUGHOUT EASTERN OKLAHOMA AND NORTHWEST ARKANSAS SHOULD MONITOR THE LATEST FORECASTS FROM THE NATIONAL WEATHER SERVICE IN TULSA AND BE PREPARED FOR ACTIVATION LATE THIS AFTERNOON AND TONIGHT.
Special weather statement, Apr 4, 1:00 PM CDT, 4 hours 42 minutes before
ARZ001-002-010-011-019-020-029-OKZ049-053>076-051200- EASTERN OKLAHOMA/NORTHWEST ARKANSAS HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE TULSA OK 100 PM CDT SUN APR 4 1999 ...A FEW SEVERE THUNDERSTORMS ARE EXPECTED EASTERN OKLAHOMA AND NORTHWEST ARKANSAS TONIGHT... .SYNOPSIS... A STRONG UPPER LEVEL LOW PRESSURE SYSTEM OVER SOUTHERN ARIZONA THIS AFTERNOON WILL MOVE INTO NORTHEASTERN NEW MEXICO BY MONDAY MORNING. AT THE SURFACE...LOW PRESSURE WILL MOVE OUT OF NEW MEXICO AND BECOME BETTER ORGANIZED OVER THE TEXAS AND OKLAHOMA PANHANDLES BY MORNING. EARLY TOMORROW MORNING A DRYLINE WILL EXTEND SOUTHWARD FROM THE LOW AND A WARM FRONT WILL EXTEND EASTWARD ACROSS NORTHERN OKLAHOMA. .DISCUSSION... EARLY THIS AFTERNOON...CONSIDERABLE LOW-LEVEL MOISTURE WAS PRESENT OVER SOUTHEASTERN TEXAS. AS THE SURFACE LOW DEVELOPS AND MOVES CLOSER TO THE AREA...SOUTHEASTERLY LOW-LEVEL WINDS ARE EXPECTED TO INCREASE THROUGHOUT THE REGION...BRINGING A RAPID RETURN OF MOISTURE AND CLOUD COVER TO THE AREA LATE THIS AFTERNOON AND TONIGHT. STRONG LIFT AHEAD OF THE UPPER- LEVEL SYSTEM...COUPLED WITH THE MOISTURE RETURN WILL ALLOW FOR SCATTERED THUNDERSTORM DEVELOPMENT ACROSS THE ENTIRE AREA POSSIBLY AS EARLY AS 5 PM THIS AFTERNOON...AND CONTINUING THROUGHOUT THE NIGHT. GIVEN THE DEGREE OF INSTABILITY AND LIFT...SOME OF THESE STORMS MAY BECOME SEVERE WITH LARGE HAIL BEING THE PRIMARY THREAT. AS THE WARM FRONT MOVES NORTHWARD ACROSS THE AREA LATER TONIGHT...WIND FIELDS WILL BECOME FAVORABLE FOR TORNADIC SUPERCELLS NEAR THE BOUNDARY. SCATTERED SEVERE STORMS MAY PERSIST ACROSS THE AREA FOR MOST OF THE NIGHT. HOWEVER...BY LATE TONIGHT A SQUALL LINE IS EXPECTED TO DEVELOP ALONG THE DRYLINE OVER WESTERN OKLAHOMA. THIS LINE OF POTENTIALLY SEVERE THUNDERSTORMS WILL LIKELY SWEEP ACROSS THE AREA TOMORROW MORNING. STRONG STRAIGHT-LINE WINDS ASSOCIATED WITH THE SQUALL-LINE MAY APPROACH AREAS TO THE WEST OF A BARTLESVILLE TO TULSA TO MCALESTER LINE BY DAYBREAK. .EMERGENCY AGENCY AND SPOTTER ACTIVATION... STORM SPOTTER GROUPS AND EMERGENCY MANAGEMENT AGENCIES THROUGHOUT EASTERN OKLAHOMA AND NORTHWEST ARKANSAS SHOULD MONITOR THE LATEST FORECASTS FROM THE NATIONAL WEATHER SERVICE IN TULSA AND BE PREPARED FOR ACTIVATION LATE THIS AFTERNOON AND TONIGHT.
Local storm report, Apr 4, 4:27 PM CDT, 1 hour 15 minutes before
PRELIMINARY LOCAL STORM REPORT...COR TIME ZONE
NATIONAL WEATHER SERVICE TULSA OK
427 PM CDT SUN APR 04 1999
TIME(CST) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0400 AM ALMA AR 1 INCH HAIL
04/03/99 CRAWFORD SOME HAIL GREATER THAN 1
INCH
0130 PM ROGERS AR WIND DAMAGE
04/03/99 BENTON NUMEROUS LARGE LIMBS
BLOWN DOWNLocal storm report, Apr 4, 5:27 PM CDT, 15 minutes before
PRELIMINARY LOCAL STORM REPORT...COR TIME ZONE
NATIONAL WEATHER SERVICE TULSA OK
527 PM CDT SUN APR 04 1999
TIME(CDT) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0450 PM FROGVILLE OK 1 INCH HAIL
04/04/99 CHOCTAWLocal storm report, Apr 4, 5:27 PM CDT, 15 minutes before
PRELIMINARY LOCAL STORM REPORT...COR TIME ZONE
NATIONAL WEATHER SERVICE TULSA OK
527 PM CDT SUN APR 04 1999
TIME(CDT) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0450 PM FROGVILLE OK 1 INCH HAIL
04/04/99 CHOCTAWLocal storm report, Apr 4, 5:32 PM CDT, 10 minutes before
PRELIMINARY LOCAL STORM REPORT...COR TIME ZONE
NATIONAL WEATHER SERVICE TULSA OK
427 PM CDT SUN APR 04 1999
TIME(CST) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0400 AM ALMA AR 1 INCH HAIL
04/03/99 CRAWFORD SOME HAIL GREATER THAN 1
INCH
0130 PM ROGERS AR WIND DAMAGE
04/03/99 BENTON NUMEROUS LARGE LIMBS
BLOWN DOWNThe office that day
Everything else NWS Tulsa, OK issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 4, 4:27 PM CDT | Severe Thunderstorm Warning | TSA | Choctaw | 33 min |
| Apr 4, 4:56 PM CDT | Severe Thunderstorm Warning | TSA | Pushmataha | 49 min |
| Apr 4, 6:56 PM CDT | Severe Thunderstorm Warning | TSA | Pushmataha | 34 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.