Alert archive / Oklahoma / Severe Thunderstorm Warnings in 1991

Severe Thunderstorm Warning 430, NWS Norman, OK

June 12, 1991Jackson County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Jun 12, 1991, 8:02 PM CDT for Jackson County, Oklahoma. It was in force for 43 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
Jun 12, 1991, 8:02 PM CDT (01:02 UTC)
Expired
Jun 12, 1991, 8:45 PM CDT
In force
43 min
Issued by
NWS Norman, OK
Area
Whole counties

County Jackson County, OK

What was reported inside it

TimeReportWhereRemark
Jun 12, 8:15 PM CDTHail 0.75Jackson, 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, 1.0 hours before the alert went out and 197 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 00:00Z on 1991-06-13Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1492 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 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 00:00Z on 1991-06-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -5 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
1492 J/kg
Mixed-layer CIN
-26 J/kg
Mixed-layer LCL
1756 m above ground
0-6 km bulk shear
11 kt
0-1 km storm-relative helicity
-5 m²/s²
0-3 km storm-relative helicity
40 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KOKC 130102
SVROKC
OKC065-130145-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE OKLAHOMA CITY OK
802 PM CDT WED JUN 12 1991
 
THE NATIONAL WEATHER SERVICE IN OKLAHOMA CITY HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  845 PM CDT
FOR THE FOLLOWING OKLAHOMA LOCATIONS...
 
IN SOUTHWEST OKLAHOMA
 
   ...NORTHEASTERN JACKSON COUNTY
 
AT 800 PM RADAR INDICATED A SEVERE THUNDERSTORM CONTINUING BETWEEN
BLAIR AND WARREN. LARGE HAIL AND EXTREMELY HEAVY RAIN ARE LIKELY TO
CONTINUE IN THIS AREA.
 
SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 55
MPH...DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN.
FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR
OF YOUR HOME OR BUSINESS.  HEAVY RAINS FLOOD ROADS QUICKLY SO
DON'T DRIVE INTO AREAS WHERE WATER COVERS THE ROAD.

What forecasters said that day

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

In the hours before

Local storm report, Jun 12, 6:02 PM CDT, 2 hours before
LOCAL STORM REPORT
NATIONAL WEATHER SERVICE OKLAHOMA CITY OK
602 PM CDT WED JUN 12 1991

TIME(CDT)   COUNTY         REPORT

539 PM      GREER          DIME SIZE HAIL AT GRANITE
Local storm report, Jun 12, 6:24 PM CDT, 1 hour 38 minutes before
LOCAL STORM REPORT
NATIONAL WEATHER SERVICE OKLAHOMA CITY OK
602 PM CDT WED JUN 12 1991

TIME(CDT)   COUNTY         REPORT

621 PM      JACKSON        1 1/4 INCH HAIL 4 MILES WEST OF WARREN
Local storm report, Jun 12, 7:16 PM CDT, 46 minutes before
LOCAL STORM REPORT
NATIONAL WEATHER SERVICE OKLAHOMA CITY OK
615 PM CDT WED JUN 12 1991

TIME(CDT)   COUNTY         REPORT

630 PM      WASHITA        NICKEL SIZE HAIL 1 MILE WEST OF ROCKY
655 PM      J@ACKSON        1 1/4 INCH HAIL 4 MILES WEST OF WARREN
Local storm report, Jun 12, 7:19 PM CDT, 43 minutes before
LOCAL STORM REPORT
NATIONAL WEATHER SERVICE OKLAHOMA CITY OK
619 PM CDT WED JUN 12 1991

TIME(CDT)   COUNTY         REPORT

710 PM      JACKSON        DIME SIZE HAIL 4 MILES WEST OF WARREN
Local storm report, Jun 12, 7:28 PM CDT, 34 minutes before
LOCAL STORM REPORT
NATIONAL WEATHER SERVICE OKLAHOMA CITY OK
728 PM CDT WED JUN 12 1991

TIME(CDT)   COUNTY         REPORT

712 PM      KIOWA          60 MPH WINDS AT ROOSEVELT
Local storm report, Jun 12, 7:43 PM CDT, 19 minutes before
LOCAL STORM REPORT
NATIONAL WEATHER SERVICE OKLAHOMA CITY OK
743 PM CDT WED JUN 12 1991

TIME(CDT)   COUNTY         REPORT

613 PM      KIOWA          DIME SIZE HAIL 1/2 MILE NORTH OF HOBART

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 12, 7:08 PM CDTSevere Thunderstorm WarningOUNJackson, Kiowa52 min
Jun 12, 7:30 PM CDTFlash Flood WarningOUNJackson3 hr
Jun 12, 8:24 PM CDTSevere Thunderstorm WarningOUNKiowa66 min
Jun 12, 9:03 PM CDTSevere Thunderstorm WarningOUNCaddo42 min
Jun 12, 9:11 PM CDTSevere Thunderstorm WarningOUNTillman49 min
Jun 12, 9:48 PM CDTSevere Thunderstorm WarningOUNComanche57 min
Jun 12, 9:59 PM CDTSevere Thunderstorm WarningOUNTillman46 min
Jun 13, 5:38 AM CDTSevere Thunderstorm WarningOUNCanadian52 min
Jun 13, 7:27 AM CDTSevere Thunderstorm WarningOUNOklahoma48 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.