Alert archive / Arkansas / Tornado Warnings in 1999
Tornado Warning 16, NWS Tulsa, OK
NWS Tulsa, OK issued this tornado warning at Apr 8, 1999, 7:30 PM CDT for Crawford County, Franklin County, Arkansas. It was in force for 30 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 8, 1999, 7:30 PM CDT (00:30 UTC)
- Expired
- Apr 8, 1999, 8:00 PM CDT
- In force
- 30 min
- Issued by
- NWS Tulsa, OK
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
Counties Crawford County, AR, Franklin County, AR
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Apr 8, 6:15 PM CDT | Tornado Watch | SPC | 4 hr |
The nearest sounding before it
Springfield, MO (KSGF), launched 00:00Z, 0.5 hours before the alert went out and 131 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
- 737 J/kg
- Mixed-layer CIN
- -8 J/kg
- Mixed-layer LCL
- 937 m above ground
- 0-6 km bulk shear
- 83 kt
- 0-1 km storm-relative helicity
- 453 m²/s²
- 0-3 km storm-relative helicity
- 582 m²/s²
- Significant tornado parameter
- 2.5
- Supercell composite
- 13.2
The text
As transmitted, in the capitals the NWS used until 2016.
999 WFUS54 KTSA 090031 RRA TORTUL ARC033-047-090100- BULLETIN - EAS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE TULSA OK 730 PM CDT THU APR 8 1999 THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A * TORNADO WARNING FOR CRAWFORD COUNTY IN NORTHWEST ARKANSAS FRANKLIN COUNTY IN NORTHWEST ARKANSAS * UNTIL 800 PM CDT * AT 730 PM CDT...RADAR INDICATED A DEVELOPING TORNADO 4 MILES NORTHEAST OF CHESTER. THIS DANGEROUS STORM IS MOVING EAST AT 25 MPH. * SOME LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE... CHESTER AND CASS IF YOU ARE IN OR NEAR THE PATH OF THIS STORM...TAKE COVER NOW IF NO UNDERGROUND SHELTER IS AVAILABLE MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR. MOBILE HOMES AND VEHICLES SHOULD BE ABANDONED FOR MORE SUBSTANTIAL SHELTER. AVOID WINDOWS LAT...LON 3582 9419 3564 9421 3559 9371 3581 9369
What forecasters said that day
The local office's own words before this tornado 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 tornado warning went out at Apr 8, 4:00 PM CDT, 3 hours 30 minutes earlier.
Area forecast discussion, Apr 8, 4:00 PM CDT, 3 hours 30 minutes before
EASTERN OKLAHOMA/NORTHWEST ARKANSAS FORECAST DISCUSSION NATIONAL WEATHER SERVICE TULSA OK 400 PM CDT THU APR 8 1999 PROBLEM(S) OF THE DAY: WILL THERE BE CONVECTION? POPS WILL THE PRECIP MEASURE? CAP HAS HELD STRONG THROUGH THE AFTERNOON WHICH HAS SUPRESSED TSRA DEVELPMENT. DRYLINE MOVED THROUGH TULSA AROUND 2030Z. EXPECT DRYLINE TO BE THROUGH ALL OF THE FA BY THIS EVENING. DESPITE UNSTABLE ATMOSPHERE AHEAD OF DRYLINE CAP LOOKS TO HOLD ON. UPPER SUPPORT STAYS TO THE NORTH. ANY TSRA DEVELOPMENT WOULD BE IN FAR NE ZONES...WILL WORD SLIGHT CHANCE THERE THIS EVENING. WITH STRONG WEST WINDS BEHIND DRYLINE...WILL GO AHEAD AND EXTEND WIND ADVISORY THROUGH THE EVENING FOR ALL BUT SOUTHEAST OK AND WEST CENTRAL AR. NEXT UPPER SYSTEM AND SURFACE LOW APPROACH VICINITY OF FA TOMORROW NIGHT AND EARLY SAT. SOUTHERLY WINDS RETURN TOMORROW AFTERNOON WITH DEWPOINTS IN THE 50S AND LOWER 60S. ATMOSPHERE MAY BE TOO CAPPED FOR ANY TSRA ACTIVITY. ALL MODELS...WITH THE NGM THE SLOWEST KEEP BEST UPPER SUPPORT TO THE NORTH AGAIN. LOOKS LIKE A SIMILAR SITUATION AS EXPERIENCED TODAY. SYSTEM PULLS OUT SATURDAY LEAVING PARTLY CLOUDY SKIES. WENT CLOSER TO FAN NUMBERS FOR THIS CYCLE AS FWC MINIMUMS SEEM TOO COOL. IN THE EXTENDED...LEFT PRETTY MUCH AS IS FOR THE WEEKEND. MODELS IN DISAGREEMENT OVER SYSTEM APPROACHING THE FA EARLY IN THE WEEK. FASTEST IS THE MRF BRINGING UPPER SYS OVER NE OK TUES NIGHT. WILL SIDE WITH SLOWER SOULTIONS AND KEEP MONDAY DRY AND MENTION SLIGHT CHANCE FOR TUESDAY. FCSTID = 23 TUL 51 78 54 73 / 0 0 20 0 FSM 51 80 55 74 / 0 0 20 0 MLC 52 81 55 75 / 0 0 10 0 BVO 50 78 52 73 / 0 0 20 0 FYV 48 75 52 71 / 10 0 20 0 IDB 51 82 56 76 / 0 0 10 0 BYV 48 75 52 71 / 10 0 20 0 MIO 49 75 51 70 / 10 0 20 0 MKO 51 78 54 73 / 0 0 20 0 F10 51 78 54 73 / 0 0 20 0 HHW 51 82 56 76 / 0 0 10 0 .TUL... OK...WIND ADVISORY FOR THIS EVENING FOR ZONES OKZ054>071. AR...WIND ADVISORY FOR THIS EVENING FOR ZONES ARZ001>002... ARZ010>011. -------------------- EXPERIMENTAL OUTPUT: HAZARDOUS WEATHER EXPECTED NEXT 24 HOURS: SLIGHT CHANCE NONE NGM CONFIDENCE: 5 ON A SCALE OF 0 TO 10 ETA CONFIDENCE: 8 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
Special weather statement, Apr 8, 6:50 PM CDT, 40 minutes before
ARZ001-002-010-011-019-020-029-OKZ049-053>076-091200- EASTERN OKLAHOMA/NORTHWEST ARKANSAS HAZARDOUS WEATHER OUTLOOK UPDATED FOR SHORT TERM TRENDS NATIONAL WEATHER SERVICE TULSA OK 650 PM CDT THU APR 8 1999 A TORNADO WATCH IS IN EFFECT UNTIL 10 PM FOR PARTS OF NORTHWEST ARKANSAS. SHOWERS AND THUNDERSTORMS HAVE BEGUN TO DEVELOP ALONG THE DRYLINE FROM EXTREME NORTHWEST ARKANSAS INTO SOUTHEAST OKLAHOMA. THE SHOWERS AND STORMS HAVE BEEN STRUGGLING SOME THUS FAR AS THEY ARE BATTLING A STRONG CAP OF WARM AIR ALOFT. HOWEVER INDICATIONS ARE THAT THE CAP MAY BE WEAKENING JUST ENOUGH TO ALLOW THESE STORMS TO RAPIDLY INTENSIFY BETWEEN 7 AND 9 PM. GIVEN THE STRONG INSTABILITY IN PLACE AND VERY FAVORABLE WIND FIELDS...TORNADIC SUPERCELLS WILL BE POSSIBLE IN NORTHWEST ARKANSAS AND PARTS OF EXTREME EASTERN OKLAHOMA THROUGH 10 PM. THE THREAT AREA WILL BE EAST OF A BENTONVILLE TO SALLISAW TO WILBURTON LINE. THE DRYLINE SHOULD MOVE EAST OF THE AREA BY 10 PM ENDING THE THREAT OF SEVERE WEATHER. SPOTTER GROUPS IN THE THREAT AREA SHOULD CONSIDER ACTIVATING AT THIS TIME.
Special weather statement, Apr 8, 6:50 PM CDT, 40 minutes before
ARZ001-002-010-011-019-020-029-OKZ049-053>076-091200- EASTERN OKLAHOMA/NORTHWEST ARKANSAS HAZARDOUS WEATHER OUTLOOK UPDATED FOR SHORT TERM TRENDS NATIONAL WEATHER SERVICE TULSA OK 650 PM CDT THU APR 8 1999 A TORNADO WATCH IS IN EFFECT UNTIL 10 PM FOR PARTS OF NORTHWEST ARKANSAS. SHOWERS AND THUNDERSTORMS HAVE BEGUN TO DEVELOP ALONG THE DRYLINE FROM EXTREME NORTHWEST ARKANSAS INTO SOUTHEAST OKLAHOMA. THE SHOWERS AND STORMS HAVE BEEN STRUGGLING SOME THUS FAR AS THEY ARE BATTLING A STRONG CAP OF WARM AIR ALOFT. HOWEVER INDICATIONS ARE THAT THE CAP MAY BE WEAKENING JUST ENOUGH TO ALLOW THESE STORMS TO RAPIDLY INTENSIFY BETWEEN 7 AND 9 PM. GIVEN THE STRONG INSTABILITY IN PLACE AND VERY FAVORABLE WIND FIELDS...TORNADIC SUPERCELLS WILL BE POSSIBLE IN NORTHWEST ARKANSAS AND PARTS OF EXTREME EASTERN OKLAHOMA THROUGH 10 PM. THE THREAT AREA WILL BE EAST OF A BENTONVILLE TO SALLISAW TO WILBURTON LINE. THE DRYLINE SHOULD MOVE EAST OF THE AREA BY 10 PM ENDING THE THREAT OF SEVERE WEATHER. SPOTTER GROUPS IN THE THREAT AREA SHOULD CONSIDER ACTIVATING AT THIS TIME.
The office that day
Everything else NWS Tulsa, OK issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 8, 7:58 PM CDT | Tornado Warning | TSA | Franklin, Madison | 32 min |
Nearby
Tornado Warnings in Arkansas, 1999Every tornado warning in 1999Tornadoes 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.