Alert archive / Arkansas / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 409, NWS Tulsa, OK

August 19, 1998Benton County, Washington County, Arkansas

NWS Tulsa, OK issued this severe thunderstorm warning at Aug 19, 1998, 3:03 PM CDT for Benton County, Washington County, Arkansas. It was in force for 42 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 19, 1998, 3:03 PM CDT (20:03 UTC)
Expired: Aug 19, 1998, 3:45 PM CDT
In force: 42 min
Issued by: NWS Tulsa, OK
Area: Whole counties

Counties Benton County, AR, Washington County, AR

The radar

The Western Arkansas radar (KSRX), 97 km from the middle of the area, began a volume at 20:03 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, 8.1 hours before the alert went out and 91 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

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

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
TTAA00 KTUL 192003 RRA
SVRTUL
ARC007-143-192045-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TULSA OK
303 PM CDT WED AUG 19 1998

THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...

  SOUTHWESTERN BENTON COUNTY IN NORTHWESTERN ARKANSAS
  WESTERN WASHINGTON COUNTY IN NORTHWESTERN ARKANSAS

* UNTIL 345 PM CDT

* AT 255 PM...RADAR DETECTED A CLUSTER OF SEVERE THUNDERSTORMS NEAR
   LAKE WEDINGTON...MOVING WEST NORTHWEST AT 15 MPH. HAIL TO THE
   SIZE OF QUARTERS WAS REPORTED IN FARMINGTON.

* SOME LOCATIONS AFFECTED INCLUDE...
  WEDINGTON
  OZARK NATIONAL FOREST
  CINCINNATI
  SILOAM SPRINGS

  HAIL TO THE SIZE OF QUARTERS 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 19, 10:15 AM CDT, 4 hours 48 minutes earlier.

Area forecast discussion, Aug 19, 10:15 AM CDT, 4 hours 48 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, 2:43 PM CDT	Severe Thunderstorm Warning	TSA	Washington	17 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, 1998 Every 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.