Alert archive / Oklahoma / Severe Thunderstorm Warnings in 1991

Severe Thunderstorm Warning 2, NWS Tulsa, OK

March 21, 1991Adair County, Oklahoma

NWS Tulsa, OK issued this severe thunderstorm warning at Mar 21, 1991, 11:09 AM CST for Adair County, Oklahoma. It was in force for 36 min. 1 report 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
Mar 21, 1991, 11:09 AM CST (17:09 UTC)
Expired
Mar 21, 1991, 11:45 AM CST
In force
36 min
Issued by
NWS Tulsa, OK
Area
Whole counties

County Adair County, OK

What was reported inside it

TimeReportWhereRemark
Mar 21, 11:18 AM CSTHail 0.88Adair, 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

Springfield, MO (KUMN), launched 12:00Z, 5.2 hours before the alert went out and 137 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 12:00Z on 1991-03-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 276 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 12:00Z on 1991-03-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 224 square meters per square second.1939587897117136156Sfc1 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
276 J/kg
Mixed-layer CIN
-101 J/kg
Mixed-layer LCL
983 m above ground
0-6 km bulk shear
60 kt
0-1 km storm-relative helicity
224 m²/s²
0-3 km storm-relative helicity
235 m²/s²
Significant tornado parameter
0.2
Supercell composite
3.1

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KTUL 211709
SVRTUL
OKC001-211745-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TULSA OK
1109 AM CST THU MAR 21 1991
 
THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 1145 AM CST
FOR PEOPLE IN THE FOLLOWING COUNTIES ...
 
IN EAST CENTRAL OKLAHOMA
 
   ...ADAIR COUNTY
 
AT 1106 AM CST RADAR INDICATED TWO SEVERE THUNDERSTORMS IN
NORTHERN DELAWARE COUNTY. ONE WAS JUST NORTH OF PROCTOR AND JUST
WEST OF BARON MOVING TOWARD THE NORTHEAST AT 45 MPH. PERSONS IN
WESTVILLE AND WATTS ARE IN THE PATH OF THESE STORMS.
 
 
WHEN THUNDERSTORMS ARE OCCURRING...PEOPLE SHOULD MOVE INSIDE A
STRONG BUILDING.  DO NOT STAND BY WINDOWS.  DON'T USE TELEPHONES
OR ELECTRICAL APPLIANCES UNLESS IN AN EMERGENCY UNTIL THE STORM
HAS PASSED.  MOTORISTS SHOULD NOT DRIVE INTO LOW WATER CROSSINGS.

The office that day

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

IssuedProductOfficeCountiesLasted
Mar 21, 10:55 AM CSTSevere Thunderstorm WarningTSADelaware35 min
Mar 21, 11:40 AM CSTSevere Thunderstorm WarningTSACherokee35 min
Mar 21, 12:22 PM CSTSevere Thunderstorm WarningTSACherokee38 min
Mar 21, 1:46 PM CSTSevere Thunderstorm WarningTSACreek44 min
Mar 21, 2:00 PM CSTSevere Thunderstorm WarningTSAPittsburg60 min
Mar 21, 2:11 PM CSTSevere Thunderstorm WarningTSAOkfuskee, Okmulgee49 min
Mar 21, 2:32 PM CSTTornado WarningTSAMcIntosh, Pittsburg43 min
Mar 21, 2:44 PM CSTSevere Thunderstorm WarningTSATulsa46 min
Mar 21, 3:17 PM CSTSevere Thunderstorm WarningTSAMuskogee28 min
Mar 21, 3:26 PM CSTSevere Thunderstorm WarningTSAMayes, Rogers49 min
Mar 21, 3:34 PM CSTSevere Thunderstorm WarningTSASequoyah56 min
Mar 21, 3:49 PM CSTSevere Thunderstorm WarningTSACreek41 min
Mar 21, 4:02 PM CSTSevere Thunderstorm WarningTSAAdair43 min
Mar 21, 4:25 PM CSTSevere Thunderstorm WarningTSAMcIntosh50 min
Mar 21, 4:33 PM CSTSevere Thunderstorm WarningTSACherokee, Muskogee42 min
Mar 21, 5:05 PM CSTSevere Thunderstorm WarningTSAAdair40 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 1991Every severe thunderstorm warning 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.