Alert archive / Oklahoma / Tornado Warnings in 1990

Tornado Warning 13, NWS Tulsa, OK

June 21, 1990Osage County, Oklahoma

NWS Tulsa, OK issued this tornado warning at Jun 21, 1990, 7:12 PM CDT for Osage County, Oklahoma. It was in force for 48 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: Jun 21, 1990, 7:12 PM CDT (00:12 UTC)
Expired: Jun 21, 1990, 8:00 PM CDT
In force: 48 min
Issued by: NWS Tulsa, OK
Area: Whole counties

County Osage County, OK

The radar

The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.

What was reported inside it

Time	Report	Where	Remark
Jun 21, 7:23 PM CDT	Thunderstorm Wind 56	Osage, OK
Jun 21, 7:58 PM CDT	Thunderstorm Wind 70	Osage, OK

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. Storm Data before 1996 records only tornadoes, thunderstorm wind and hail.

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 0.2 hours before the alert went out and 181 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: 463 J/kg
Mixed-layer CIN: -197 J/kg
Mixed-layer LCL: 2365 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 78 m²/s²
0-3 km storm-relative helicity: 110 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.6

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KTUL 220011
TORTUL
OKC113-220100-
 
BULLETIN - EBS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE TULSA OK
712PM CDT THU JUN 21 1990
 
THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A
TORNADO WARNING EFFECTIVE UNTIL  800 PM CDT
FOR PEOPLE IN THE FOLLOWING COUNTIES ...
 
IN NORTHEAST OKLAHOMA
 
   ...WESTERN OSAGE COUNTY
 
AT 710 PM RADAR INDICATED A TORNADO 6 MILES WEST OF FAIRFAX. UNITS
FROM THE OKLAHOMA HIGHWAY PATROL ALSO REPORT LARGE TREES DOWN IN THE
FAIRFAX AREA...AS WELL AS NEW FUNNEL CLOUDS FORMING TO THE WEST OF
FAIRFAX. PEOPLE IN FAIRFAX SHOULD TAKE COVER NOW.
 
THIS IS A DANGEROUS STORM SITUATION.  ACT QUICKLY.  IF YOU ARE IN THE
PATH OF THIS TORNADO MOVE TO A SHELTER BELOW GROUND IF AVAILABLE.
OTHERWISE...GO TO A SMALL INTERIOR ROOM ON THE LOWEST FLOOR POSSIBLE.
STAY AWAY FROM OUTSIDE WALLS AND AVOID WINDOWS.  ABANDON CARS AND
MOBILE HOMES FOR A REINFORCED BUILDING OR GET IN A GROUND DEPRESSION.

The office that day

Everything else NWS Tulsa, OK issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 21, 7:03 PM CDT	Severe Thunderstorm Warning	TSA	Osage	42 min
Jun 21, 8:02 PM CDT	Severe Thunderstorm Warning	TSA	Pawnee	28 min
Jun 21, 8:10 PM CDT	Severe Thunderstorm Warning	TSA	Osage	50 min
Jun 21, 8:15 PM CDT	Severe Thunderstorm Warning	TSA	Creek	30 min
Jun 21, 8:20 PM CDT	Severe Thunderstorm Warning	TSA	Tulsa	40 min
Jun 21, 8:44 PM CDT	Severe Thunderstorm Warning	TSA	Rogers, Wagoner	46 min
Jun 21, 9:54 PM CDT	Severe Thunderstorm Warning	TSA	Sequoyah	66 min
Jun 21, 10:50 PM CDT	Severe Thunderstorm Warning	TSA	LeFlore	55 min

Nearby

Tornado Warnings in Oklahoma, 1990 Every tornado warning in 1990 Tornadoes in 1990

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.