Alert archive / Oklahoma / Severe Thunderstorm Warnings in 1996

Severe Thunderstorm Warning 680, NWS Norman, OK

October 20, 1996Grady County, Stephens County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Oct 20, 1996, 9:20 PM CDT for Grady County, Stephens County, Oklahoma. It was in force for 40 min. 3 reports 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
Oct 20, 1996, 9:20 PM CDT (02:20 UTC)
Expired
Oct 20, 1996, 10:00 PM CDT
In force
40 min
Issued by
NWS Norman, OK
Area
Whole counties; the outline is the Mesonet’s reconstruction

Counties Grady County, OK, Stephens County, OK

What was reported inside it

TimeReportWhereRemark
Oct 20, 9:37 PM CDTHail 1Rush Spgs, OK
Oct 20, 9:37 PM CDTHail 1Marlow, OK
Oct 20, 10:10 PM CDTThunderstorm Wind 50Duncan, OKmeasured at the Oklahoma Mesonet site

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.

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 2.3 hours before the alert went out and 67 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 1996-10-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2190 joules per kilogram.LCLEL10008507005003002001001 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 00:00Z on 1996-10-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 44 square meters per square second.19395878Sfc1 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
2190 J/kg
Mixed-layer CIN
-4 J/kg
Mixed-layer LCL
1232 m above ground
0-6 km bulk shear
39 kt
0-1 km storm-relative helicity
44 m²/s²
0-3 km storm-relative helicity
71 m²/s²
Significant tornado parameter
0.2
Supercell composite
1.1

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

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.

NWS Norman, OK wrote its last area forecast discussion before this severe thunderstorm warning went out at Oct 20, 3:57 PM CDT, 5 hours 23 minutes earlier.

Area forecast discussion, Oct 20, 3:57 PM CDT, 5 hours 23 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE OKLAHOMA CITY OK
330 PM CDT SUN OCT 20 1996

CDFNT HAS EDGED INTO NWRN CORNER OF OK THIS AFTN WHILE TO THE SW AN AREA
OF SCT TSTMS HAS DVLPD IN THE SERN TX PH. FNT MOVG ON THROUGH MUCH OF
THE FA TNGT WHILE LARGE AMP UPR TROF DVLPS AND APRCHS FM THE W. SUF
DESTABILIZATION TO WARRANT MENTION OF TSTMS MST ALL ZONES TNGT THO LO
LVL MSTR WL BE SHALLOW DUE TO VEERING LO LVL WNDS AHD OF THE FNTL ZONE.
THE REAL CAA LAGS THE FNT CONSIDERABLY AND WL GET STARTED LATE TNGT
AND TMRW WITH STEADY OR VRY SLOLY FALLING TEMPS EXPECTED MUCH OF THE
AREA BY LATE MRNG. WITH GOOD LIFT FM APRCHG UPR WV... CLOUDY SKIES AND
CHC OF RAIN ALSO ANTICIPATED. MODELS SHOW THICKNESS VALUES SUF COLD FOR
SOME OF THE RAIN TO BCM MXD WITH SNOW NWRN COUNTIES BEFORE THE
THREAT OF PCPN TAPERS OFF BY ERY MON NGT WITH END OF UVV FROM THE UPR
SYSM.

FCSTID = 12
OKC   53  55  36  50 /  30  40  20  10
HBR   49  52 < 36  52 /  30  50  20  10
SPS   59  64  38  56 /  30  40  30  10
GAG   40  42  29  47 /  30  40  20  10
PNC   50  53  35  48 /  30  40  30  10
DUA   63  66  45  56 /  30  40  30  10

.OKC...
OK...NONE.
TX...NONE.

In the hours before

Local storm report, Oct 20, 6:32 PM CDT, 2 hours 48 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE OKLAHOMA CITY OK
635 PM CDT SUN OCT 20 1996

TIME(CDT)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....COUNTY LOCATION....

630 PM     7 SW LAWTON              OK     1.00 INCH HAIL
10/20/96   COMANCHE

CW
Local storm report, Oct 20, 7:28 PM CDT, 1 hour 52 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE OKLAHOMA CITY OK
732 PM CDT SUN OCT 20 1996

TIME(CDT)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....COUNTY LOCATION....

720 PM     DUNCAN                    OK   1.25 INCH HAIL.
10/20/96   STEPHENS

721 PM     4 W DUNCAN                OK   1.75 INCH HAIL.
10/20/96   STEPHENS

721 PM     1 N EMPIRE CITY           OK   1.75 INCH HAIL.
10/20/96   STEPHENS

728 PM     2 S DUNCAN                OK   1.75 INCH HAIL.
10/20/96   STEPHENS

728 PM     2 SW DUNCAN               OK   2.75 INCH HAIL.
10/20/96   STEPHENS

MCCAMMON
Local storm report, Oct 20, 7:53 PM CDT, 1 hour 27 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE OKLAHOMA CITY OK
755 PM CDT SUN OCT 20 1996

TIME(CDT)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....COUNTY LOCATION....

746 PM     5W VELMA                    OK   0.88 INCH HAIL.
10/20/96   STEPHENS

MCCAMMON
Local storm report, Oct 20, 8:10 PM CDT, 1 hour 10 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE OKLAHOMA CITY OK
814 PM CDT SUN OCT 20 1996

TIME(CDT)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....COUNTY LOCATION....

8100 PM     KINGFISHER                 OK   1.00 INCH HAIL.
10/20/96   KINGFISHER

MCCAMMON
Local storm report, Oct 20, 8:41 PM CDT, 39 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE OKLAHOMA CITY OK
845 PM CDT SUN OCT 20 1996

TIME(CDT)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....COUNTY LOCATION....

823 PM     DUNCAN                     OK   0.75 INCH HAIL.
10/20/96   STEPHENS

826 PM     CRESCENT                   OK   1.00 INCH HAIL.
10/20/96   LOGAN

836 PM     1 W ALPERS                 OK   0.75 INCH HAIL.
10/20/96   CARTER

MCCAMMON
Local storm report, Oct 20, 9:11 PM CDT, 9 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE OKLAHOMA CITY OK
915 PM CDT SUN OCT 20 1996

TIME(CDT)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....COUNTY LOCATION....

907d-912 PM LAWTON                     OK   1.75 INCH HAIL.
10/20/96   COMANCHE

MCCAMMON

The office that day

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

IssuedProductOfficeCountiesLasted
Oct 20, 7:07 PM CDTTornado WarningOUNStephens38 min
Oct 20, 7:43 PM CDTTornado WarningOUNCarter, Stephens32 min
Oct 20, 8:07 PM CDTSevere Thunderstorm WarningOUNKingfisher53 min
Oct 20, 8:13 PM CDTSevere Thunderstorm WarningOUNComanche, Kiowa, Tillman47 min
Oct 20, 8:15 PM CDTSevere Thunderstorm WarningOUNCarter, Garvin, Murray45 min
Oct 20, 8:15 PM CDTSevere Thunderstorm WarningOUNStephens45 min
Oct 20, 8:26 PM CDTSevere Thunderstorm WarningOUNLogan49 min
Oct 20, 8:30 PM CDTFlash Flood WarningOUNStephens3 hr
Oct 20, 8:55 PM CDTSevere Thunderstorm WarningOUNComanche50 min
Oct 20, 8:59 PM CDTSevere Thunderstorm WarningOUNCarter, Garvin, Murray46 min
Oct 20, 9:00 PM CDTSevere Thunderstorm WarningOUNNoble, Payne45 min
Oct 20, 9:15 PM CDTTornado WarningOUNMurray30 min
Oct 20, 9:40 PM CDTFlash Flood WarningOUNMurray3 hr
Oct 20, 9:40 PM CDTSevere Thunderstorm WarningOUNPayne50 min
Oct 20, 9:43 PM CDTTornado WarningOUNMurray32 min
Oct 20, 9:47 PM CDTSevere Thunderstorm WarningOUNCarter43 min
Oct 20, 9:49 PM CDTSevere Thunderstorm WarningOUNLincoln, Oklahoma41 min
Oct 20, 9:57 PM CDTSevere Thunderstorm WarningOUNGarvin, Grady, McClain, Stephens48 min
Oct 20, 10:02 PM CDTSevere Thunderstorm WarningOUNJohnston, Pontotoc43 min
Oct 20, 10:26 PM CDTSevere Thunderstorm WarningOUNCarter, Murray49 min
Oct 20, 10:26 PM CDTSevere Thunderstorm WarningOUNLincoln, Payne49 min
Oct 20, 10:35 PM CDTSevere Thunderstorm WarningOUNAtoka, Coal40 min
Oct 20, 10:41 PM CDTSevere Thunderstorm WarningOUNGarvin49 min
Oct 20, 10:45 PM CDTSevere Thunderstorm WarningOUNAtoka, Johnston60 min
Oct 20, 11:07 PM CDTSevere Thunderstorm WarningOUNMurray, Pontotoc53 min
Oct 20, 11:11 PM CDTSevere Thunderstorm WarningOUNCoal49 min
Oct 20, 11:37 PM CDTSevere Thunderstorm WarningOUNJohnston, Marshall53 min
Oct 20, 11:43 PM CDTSevere Thunderstorm WarningOUNAtoka, Pushmataha47 min
Oct 21, 12:01 AM CDTSevere Thunderstorm WarningOUNBryan29 min
Oct 21, 12:30 AM CDTSevere Thunderstorm WarningOUNAtoka, Bryan, Choctaw, Pushmataha60 min
Oct 21, 12:45 AM CDTSevere Thunderstorm WarningOUNMarshall30 min
Oct 21, 1:28 AM CDTSevere Thunderstorm WarningOUNBryan47 min
Oct 21, 1:32 AM CDTSevere Thunderstorm WarningOUNChoctaw, Pushmataha43 min
Oct 21, 2:53 AM CDTSevere Thunderstorm WarningOUNChoctaw67 min
Oct 21, 9:38 AM CDTFlash Flood WarningOUNAtoka, Bryan, Choctaw, Pushmataha3 hr

Nearby

Severe Thunderstorm Warnings in Oklahoma, 1996Every severe thunderstorm warning in 1996

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.