Alert archive / Oklahoma / Severe Thunderstorm Warnings in 1991

Severe Thunderstorm Warning 607, NWS Norman, OK

October 4, 1991Bryan County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Oct 4, 1991, 5:05 PM CDT for Bryan County, Oklahoma. It was in force for 32 min.

The area

The counties it named.

The facts

Issued
Oct 4, 1991, 5:05 PM CDT (22:05 UTC)
Expired
Oct 4, 1991, 5:37 PM CDT
In force
32 min
Issued by
NWS Norman, OK
Area
Whole counties

County Bryan County, OK

The radar

The Norman radar (KTLX), 179 km from the middle of the area, began a volume at 22:07 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Norman, OK (KOUN), launched 12:00Z, 10.1 hours before the alert went out and 175 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, Norman, OK at 12:00Z on 1991-10-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 690 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, Norman, OK at 12:00Z on 1991-10-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 276 square meters per square second.193958Sfc1 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
690 J/kg
Mixed-layer CIN
-401 J/kg
Mixed-layer LCL
1461 m above ground
0-6 km bulk shear
23 kt
0-1 km storm-relative helicity
276 m²/s²
0-3 km storm-relative helicity
297 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.1

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KOKC 042205
SVROKC
OKC013-023-127-042300-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE OKLAHOMA CITY OK
505 PM CDT FRI OCT 4 1991
 
THE NATIONAL WEATHER SERVICE IN OKLAHOMA CITY HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  600 PM CDT
FOR THE FOLLOWING OKLAHOMA LOCATIONS...
 
IN SOUTHEAST OKLAHOMA
 
   ...EASTERN BRYAN COUNTY...CHOCTAW COUNTY...PUSHMATAHA COUNTY
 
AT 505 PM A SEVERE THUNDERSTORMS WAS INDICATED 11 MILES WEST OF
FINDLEY AND 6 MILES WEST OF BOSWELL MOVING EAST-NORTHEAST AT 30 MPH.
LARGE HAIL AND STRONG WINDS WILL LIKELY ACCOMPANY THESE STORMS.
 
WHEN THUNDERSTORMS ARE OCCURRING...PEOPLE SHOULD MOVE INSIDE A
STRONG BUILDING.  DO NhOT 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 Norman, OK issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Oct 4, 5:05 PM CDTSevere Thunderstorm WarningOUNChoctaw, Pushmataha55 min
Oct 4, 5:55 PM CDTSevere Thunderstorm WarningOUNPushmataha35 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.