Alert archive / Oklahoma / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 91, NWS Tulsa, OK

April 7, 1998Cherokee County, Oklahoma

NWS Tulsa, OK issued this severe thunderstorm warning at Apr 7, 1998, 9:21 PM CDT for Cherokee County, Oklahoma. It was in force for 24 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: Apr 7, 1998, 9:21 PM CDT (02:21 UTC)
Expired: Apr 7, 1998, 9:45 PM CDT
In force: 24 min
Issued by: NWS Tulsa, OK
Area: Whole counties

County Cherokee County, OK

The nearest sounding before it

Springfield, MO (KSGF), launched 00:00Z, 2.4 hours before the alert went out and 154 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: 4 J/kg
Mixed-layer CIN: -4 J/kg
Mixed-layer LCL: 1421 m above ground
0-6 km bulk shear: 68 kt
0-1 km storm-relative helicity: 84 m²/s²
0-3 km storm-relative helicity: 173 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 080221 RRA
SVRTUL
OKC021-080245-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TULSA OK
921 PM CDT TUE APR 7 1998

THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 945 PM CDT
FOR PEOPLE IN THE FOLLOWING LOCATION...

IN EAST CENTRAL OKLAHOMA

   ...SOUTHERN CHEROKEE COUNTY

AT 920 PM CDT...DOPPLER RADAR INDICATED A LINE OF SEVERE
THUNDERSTORMS 5 MILES NORTHWEST OF COOKSON TO 3 MILES WEST OF
TAHLEQUAH.  THESE STORMS ARE MOVING TO THE EAST AT 40 MPH.
TAHLEQUAH AND COOKSON ARE IN THE PATH OF THESE STORMS.

HAIL TO THE SIZE OF NICKELS AND WIND GUSTS TO 60 MPH CAN BE
EXPECTED IN THE WARNED AREA.

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 7, 9:20 PM CDT, 1 minute earlier.

Area forecast discussion, Apr 7, 9:20 PM CDT, 1 minute before

FPUS3 KTUL 080221
AFDTUL
EASTERN OKLAHOMA/NORTHWEST ARKANSAS FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TULSA OK
920 PM CDT TUE APR 7 1998

SHRA/TSRA CONTINUING ACROSS NE OK AND APPEARANTLY DESTINED TO MOVE
INTO NW AR. INTERESTING STRUCTURE AND EVOLUTION. BASES AROUND 5000
FT AND TOPS AROUND 20000 FT. STRAIGHT-LINE HODOGRAPH EVIDENT ABOVE
5000 FT...INSERTING DEVIANT MOTION OF STORM SE OF TUL SHOWS DECENT
STORM-RELATIVE INFLOW. STORM SHOWED SUPERCELL CHARACTERISTICS FOR A
WHILE BUT LARGEST HAIL REPORTED HAS ONLY BEEN NICKEL SIZE. WITH
LOW/MID-LEVEL SR INFLOW EXPECT STORMS TO CONTINUE FOR A WHILE
LONGER. MAY HAVE TO UPDATE ZONES AGAIN IF STORMS WILL PERSIST AFTER
MIDNIGHT.

FCSTID = 26

.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
Apr 7, 7:26 PM CDT	Severe Thunderstorm Warning	TSA	Creek	34 min
Apr 7, 7:58 PM CDT	Severe Thunderstorm Warning	TSA	Creek, Okmulgee, Tulsa	32 min
Apr 7, 8:24 PM CDT	Severe Thunderstorm Warning	TSA	Muskogee, Wagoner	36 min
Apr 7, 8:35 PM CDT	Severe Thunderstorm Warning	TSA	Creek	40 min
Apr 7, 8:54 PM CDT	Severe Thunderstorm Warning	TSA	Muskogee, Wagoner	36 min
Apr 7, 9:16 PM CDT	Severe Thunderstorm Warning	TSA	Creek, Tulsa	29 min
Apr 7, 9:31 PM CDT	Severe Thunderstorm Warning	TSA	Wagoner	29 min
Apr 7, 9:58 PM CDT	Severe Thunderstorm Warning	TSA	Wagoner	32 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 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.