Alert archive / Arkansas / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 408, NWS Tulsa, OK
NWS Tulsa, OK issued this severe thunderstorm warning at Aug 19, 1998, 2:43 PM CDT for Washington County, Arkansas. It was in force for 17 min. 2 reports came from inside the area while it was in force.
The area
The counties it named, with what was reported inside it.
The facts
- Issued
- Aug 19, 1998, 2:43 PM CDT (19:43 UTC)
- Expired
- Aug 19, 1998, 3:00 PM CDT
- In force
- 17 min
- Issued by
- NWS Tulsa, OK
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
County Washington County, AR
The radar
The Western Arkansas radar (KSRX), 78 km from the middle of the area, began a volume at 19:45 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 |
|---|---|---|---|
| Aug 19, 2:45 PM CDT | Hail 1 | Farmington, AR | |
| Aug 19, 2:50 PM CDT | Thunderstorm Wind | Wedington, AR | Several large tree limbs were blown down |
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
Springfield, MO (KSGF), launched 12:00Z, 7.7 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
- 1103 J/kg
- Mixed-layer CIN
- -122 J/kg
- Mixed-layer LCL
- 1601 m above ground
- 0-6 km bulk shear
- 17 kt
- 0-1 km storm-relative helicity
- 7 m²/s²
- 0-3 km storm-relative helicity
- 28 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 Aug 19, 10:15 AM CDT, 4 hours 28 minutes earlier.
Area forecast discussion, Aug 19, 10:15 AM CDT, 4 hours 28 minutes before
FPUS3 KTUL 191516 AFDTUL EASTERN OKLAHOMA/NORTHWEST ARKANSAS FORECAST DISCUSSION NATIONAL WEATHER SERVICE TULSA OK 1015 AM CDT WED AUG 19 1998 MORNING UPPER AIR DATA REVEALS ONLY SUBTLE CHANGES AT MOST COMPARED WITH PREVIOUS FEW DAYS. HOWEVER VISIBLE SATELLITE IMAGERY SHOWS SOME ALTOCUMULUS CASTELLANUS IN CENTRAL ARKANSAS. AND THERE MAY BE A WEAK BOUNDARY IN NORTH CENTRAL/NORTHEAST ARKANSAS FROM AN EARLIER CLUSTER OF STORMS. IF BOUNDARY KEEPS ITS DEFINITION IT MAY MAKE INTO EASTERN PARTS OF THE FORECAST AREA. WITH A WEAK DISTURBANCE ROTATING UNDERNEATH THE UPPER RIDGE CENTERED IN NORTHERN MISSOURI AND THE HEAT OF THE DAY THIS MAY BE ENOUGH TO RESULT IN MORE THAN THE ISOLATED SHOWERS AND THUNDERSTORMS THAT HAVE OCCURRED PREVIOUSLY WITH THIS PATTERN. THUS WILL KEEP A 30 PERCENT PROBABILITY OF PRECIPITATION FOR EASTERN AND SOUTHERN SECTIONS. HOWEVER WILL LOWER THE CHANCE TO 20 PERCENT ELSEWHERE. OTHERWISE LOOKS LIKE ONLY MINOR ADJUSTMENTS MAY BE NEEDED TO TEMPERATURES AND WINDS. .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 19, 3:27 PM CDT | Severe Thunderstorm Warning | TSA | Mayes | 48 min |
| Aug 19, 4:26 PM CDT | Severe Thunderstorm Warning | TSA | Wagoner | 64 min |
| Aug 19, 5:24 PM CDT | Severe Thunderstorm Warning | TSA | Tulsa | 51 min |
| Aug 19, 5:39 PM CDT | Severe Thunderstorm Warning | TSA | LeFlore | 51 min |
| Aug 19, 6:11 PM CDT | Severe Thunderstorm Warning | TSA | Pittsburg | 49 min |
| Aug 19, 6:29 PM CDT | Severe Thunderstorm Warning | TSA | Washington | 46 min |
| Aug 19, 6:39 PM CDT | Severe Thunderstorm Warning | TSA | Latimer, Pushmataha | 51 min |
| Aug 19, 3:03 PM CDT | Severe Thunderstorm Warning | TSA | Benton, Washington | 42 min |
| Aug 19, 5:44 PM CDT | Severe Thunderstorm Warning | TSA | Benton | 46 min |
| Aug 19, 6:17 PM CDT | Flash Flood Warning | TSA | Benton | 2 hr |
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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.