Alert archive / Arkansas / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 405, NWS Tulsa, OK
NWS Tulsa, OK issued this severe thunderstorm warning at Aug 18, 1998, 4:47 PM CDT for Washington County, Arkansas. 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
- Aug 18, 1998, 4:47 PM CDT (21:47 UTC)
- Expired
- Aug 18, 1998, 5:30 PM CDT
- In force
- 43 min
- Issued by
- NWS Tulsa, OK
- Area
- Whole counties
County Washington County, AR
The radar
The Western Arkansas radar (KSRX), 78 km from the middle of the area, began a volume at 21:51 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
Springfield, MO (KSGF), launched 12:00Z, 9.8 hours before the alert went out and 109 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
- 1016 J/kg
- Mixed-layer CIN
- -221 J/kg
- Mixed-layer LCL
- 1469 m above ground
- 0-6 km bulk shear
- 13 kt
- 0-1 km storm-relative helicity
- 115 m²/s²
- 0-3 km storm-relative helicity
- 142 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
302 WUUS54 KTSA 182149 RRA SVRTUL ARC143-182230- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE TULSA OK 447 PM CDT TUE AUG 18 1998 THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... WASHINGTON COUNTY IN NORTHWESTERN ARKANSAS * UNTIL 530 PM CDT * AT 446 PM...RADAR DETECTED A SEVERE THUNDERSTORM 3 MILES NORTH OF FAYETTEVILLE...DRIFTING SLOWLY NORTHWEST. * SOME LOCATIONS AFFECTED INCLUDE... SPRINGDALE FAYETTEVILLE HAIL TO THE SIZE OF DIMES AND WIND GUSTS TO 60 MPH CAN BE EXPECTED IN THE WARNED AREA. BE ALERT TO RAPIDLY CHANGING WEATHER CONDITIONS AS STORMS APPROACH.
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 18, 3:50 PM CDT, 57 minutes earlier.
Area forecast discussion, Aug 18, 3:50 PM CDT, 57 minutes before
EASTERN OKLAHOMA/NORTHWEST ARKANSAS FORECAST DISCUSSION NATIONAL WEATHER SERVICE TULSA OK 350 PM CDT TUE AUG 18 1998 PATTERN LOOKING FAIRLY SIMILAR THROUGH THE SHORT RANGE FORECAST. SYSTEMS WILL MOVE ALONG IN THE EASTERLY FLOW GENERALLY TO THE SOUTH OF THE FORECAST AREA. THUS BELIEVE THAT MOST IF NOT ALL PRECIPITATION WILL BE DIURNAL IN SOUTHERN AND EASTERN ZONES. WILL CONTINUE TO MENTION ISOLATED AFTERNOON AND EVENING THUNDERSTORMS IN THESE AREAS. ELSEWHERE IT SHOULD REMAIN DRY. LOW LEVEL FLOW GRADUALLY BECOMES MORE EASTERLY. MAXIMUM TEMPERATURES LOOK NEARLY AS WARM ON WEDNESDAY COMPARED TO TODAY BUT THEN DROPPED THEM JUST A LITTLE BIT BY THURSDAY. MEDIUM RANGE MODELS SHOW THE UPPER RIDGE ONCE AGAIN RETROGRADING INTO THE ROCKIES DURING THE WEEKEND. THIS WILL RESULT IN WEAK NORTHWEST FLOW DEVELOPING ACROSS EASTERN OKLAHOMA AND NORTHWEST ARKANSAS. BELIEVE THE MEDIUM RANGE FORECAST MODEL IS OVERDONE WITH A SHORTWAVE COMING ACROSS THE PLAINS AND SO FOR NOW WILL KEEP THE STATUS QUO WITH A DRY FORECAST IN THE EXTENDED PERIODS. TUL 76 97 75 95 / 0 0 0 0 FSM 71 97 70 94 / 10 10 10 10 MLC 74 98 73 95 / 0 0 0 0 BVO 72 99 71 96 / 0 0 0 0 FYV 69 94 68 92 / 10 10 10 10 IDB 70 98 69 95 / 10 10 10 10 BYV 67 94 66 91 / 10 10 10 10 MIO 72 94 71 93 / 0 0 0 10 MKO 72 97 71 95 / 0 0 0 10 F10 74 98 73 95 / 0 0 0 0 HHW 73 99 72 96 / 10 10 10 10 .TUL... OK...NONE. AR...NONE.
The office that day
Everything else NWS Tulsa, OK issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 18, 4:56 PM CDT | Severe Thunderstorm Warning | TSA | Benton | 34 min |
| Aug 18, 5:53 PM CDT | Severe Thunderstorm Warning | TSA | Benton | 52 min |
| Aug 18, 6:00 PM CDT | Flash Flood Warning | TSA | Benton | 90 min |
Nearby
Severe Thunderstorm Warnings in Arkansas, 1998Every severe thunderstorm warning in 1998
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.