Alert archive / Oklahoma / Tornado Warnings in 1991

Tornado Warning 20, NWS Tulsa, OK

July 12, 1991Mayes County, Oklahoma

NWS Tulsa, OK issued this tornado warning at Jul 12, 1991, 8:03 PM CDT for Mayes County, Oklahoma. It was in force for 27 min.

The area

The counties it named.

The facts

Issued
Jul 12, 1991, 8:03 PM CDT (01:03 UTC)
Expired
Jul 12, 1991, 8:30 PM CDT
In force
27 min
Issued by
NWS Tulsa, OK
Area
Whole counties

County Mayes County, OK

The nearest sounding before it

Springfield, MO (KUMN), launched 00:00Z, 1.1 hours before the alert went out and 144 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-pSkew-T log-p diagram, Springfield, MO at 00:00Z on 1991-07-13Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 632 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Springfield, MO at 00:00Z on 1991-07-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 56 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
632 J/kg
Mixed-layer CIN
-140 J/kg
Mixed-layer LCL
1149 m above ground
0-6 km bulk shear
34 kt
0-1 km storm-relative helicity
56 m²/s²
0-3 km storm-relative helicity
129 m²/s²
Significant tornado parameter
-0.0
Supercell composite
-0.2

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KTUL 130104
TORTUL
OKC097-130130-
 
BULLETIN - EBS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE TULSA OK
803 PM CDT FRI JUL 12 1991
 
THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A
TORNADO WARNING EFFECTIVE UNTIL  830 PM CDT
FOR PEOPLE IN THE FOLLOWING COUNTIES ...
 
IN NORTHEAST OKLAHOMA
 
   ...NORTHERN MAYES COUNTY
 
AT 8 PM A TORNADO WAS SIGHTED BY A STATE TROOPER 2 MILES WEST AND 1
MILE NORTH OF ADAIR. MOVEMENT WAS EAST AT 10 MILES AN HOUR.
 
 
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.
 
REPORT ANY SEVERE WEATHER TO THE NEAREST LAW ENFORCEMENT AGENCY AND
ASK THEM TO RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE.
 
KEEP TUUNED TO THIS STATION FOR THE LATEST WEATHER BULLETINS.

What forecasters said that day

The local office's own words before this tornado warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

In the hours before

Special weather statement, Jul 12, 6:52 PM CDT, 1 hour 11 minutes before
OKZ026>031-130100-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE TULSA OK
650 PM CDT FRI JUL 12 1991

...THUNDERSTORMS INCREASING IN NORTHEAST OKLAHOMA...

AT 645 PM NATIONAL WEATHER SERVICE RADAR AT TULSA SHOWED A SCATTERED
LINE OF SHOWERS AND THUNDERSTORMS EXTENDING FROM JUST NORTH OF NOWATA
TO BARNSDALL TO FAIRFAX. THE STORMS ARE MOVING SOUTH SOUTHEAST AT 35
MILES AN HOUR AND WILL BE APPROACHING VINITA...TULSA...AND SAPULPA BY
AROUND 730 PM. THE MAIN THREAT FROM THESE THUNDERSTORMS APPEARS TO BE
WIND GUSTS TO BETWEEN 30 AND 40 MILES AN HOUR. RADAR CURRENTLY
INDICATES MOST RAINFALL TO BE OF LIGHT TO MODERATE INTENSITY.

A COUPLE OF THUNDERSTORMS WERE ALSO DEVELOPING IN NORTHEAST ROGERS
COUNTY NEAR CHELSEA. THESE STORMS APPEARED MORE CAPABLE OF PRODUCING
VERY HEAVY RAIN AND POSSIBLE SMALL HAIL. MOVEMENT OF THESE STORMS HAS
NOT BEEN DETERMINED.

STAY TUNED TO THIS STATION FOR THE LATEST WEATHER INFORMATION FROM THE
NATIONAL WEATHER SERVICE.

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 12, 7:25 PM CDTSevere Thunderstorm WarningTSAMayes50 min
Jul 13, 3:22 PM CDTSevere Thunderstorm WarningTSALeFlore68 min

Nearby

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