Alert archive / Oklahoma / Tornado Warnings in 1991

Tornado Warning 21, NWS Norman, OK

March 26, 1991Grant County, Oklahoma

NWS Norman, OK issued this tornado warning at Mar 26, 1991, 8:21 PM CST for Grant County, Oklahoma. It was in force for 54 min.

The area

The counties it named.

The facts

Issued: Mar 26, 1991, 8:21 PM CST (02:21 UTC)
Expired: Mar 26, 1991, 9:15 PM CST
In force: 54 min
Issued by: NWS Norman, OK
Area: Whole counties

County Grant County, OK

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 2.4 hours before the alert went out and 179 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: 2000 J/kg
Mixed-layer CIN: -91 J/kg
Mixed-layer LCL: 814 m above ground
0-6 km bulk shear: 53 kt
0-1 km storm-relative helicity: 229 m²/s²
0-3 km storm-relative helicity: 373 m²/s²
Significant tornado parameter: 2.1
Supercell composite: 5.4

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KOKC 270223
TOROKC
OKC053-270315-
 
BULLETIN - EBS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE OKLAHOMA CITY OK
821 PM CST TUE MAR 26 1991
 
THE NATIONAL WEATHER SERVICE IN OKLAHOMA CITY HAS ISSUED A
TORNADO WARNING EFFECTIVE UNTIL  915 PM CST
FOR THE FOLLOWING OKLAHOMA LOCATIONS...
 
IN NORTHWEST OKLAHOMA
 
   ...GRANT COUNTY
 
AT 821 PM A TORNADO WAS INDICATED BY NATIONAL WEATHER SERVICE RADAR 3
MILES WEST OF POND CREEK MOVING NORTHEAST AT 40 MPH. PEOPLE IN
JEFFERSON...MEDFORD...AND DEER CREEK ARE IN THE PROJECTED PATH OF THIS
TORNADO. DAMAGE HAS BEEN REPORTED IN ALFALFA COUNTY WITH THIS
STORM.
 
THIS IS A DANGEROUS STORM SITUATION.  ACT QUICKLY.  IF YOU ARE
IN THE PATH OF THIS TORNA)DO MOVE TO A SHELTER BELOW GROUND IF
AVAILABLE.  OTHERWISE...GO TO A SMALL INTERIOR ROOM ON THE LOWEST
FLOOR POSSIBLE.  AVOID WINDOWS.  ABANDON CARS AND MOBILE HOMES
FOR A REINFORCED BUILDING OR GET INTO A DITCH OR CULVERT.

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 26, 6:10 PM CST	Tornado Warning	OUN	Dewey	35 min
Mar 26, 6:16 PM CST	Severe Thunderstorm Warning	OUN	Major, Woodward	44 min
Mar 26, 6:29 PM CST	Tornado Warning	OUN	Major, Woodward	31 min
Mar 26, 7:00 PM CST	Tornado Warning	OUN	Major	30 min
Mar 26, 7:13 PM CST	Severe Thunderstorm Warning	OUN	Alfalfa, Woods	62 min
Mar 26, 7:35 PM CST	Tornado Warning	OUN	Alfalfa	25 min
Mar 26, 7:52 PM CST	Tornado Warning	OUN	Grant	38 min
Mar 26, 8:50 PM CST	Tornado Warning	OUN	Kay	40 min
Mar 26, 10:10 PM CST	Severe Thunderstorm Warning	OUN	Beckham, Custer, Washita	65 min
Mar 26, 10:10 PM CST	Severe Thunderstorm Warning	OUN	Greer, Jackson, Kiowa	65 min
Mar 26, 11:15 PM CST	Severe Thunderstorm Warning	OUN	Grady	90 min
Mar 26, 11:19 PM CST	Tornado Warning	OUN	Caddo	26 min
Mar 26, 11:34 PM CST	Tornado Warning	OUN	Canadian, Grady	26 min

Nearby

Tornado Warnings in Oklahoma, 1991 Every tornado warning in 1991 Tornadoes in 1991

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.