Alert archive / Oklahoma / Tornado Warnings in 1996

Tornado Warning 18, NWS Norman, OK

April 21, 1996Bryan County, Oklahoma

NWS Norman, OK issued this tornado warning at Apr 21, 1996, 9:52 PM CDT for Bryan County, Oklahoma. It was in force for 68 min. 4 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: Apr 21, 1996, 9:52 PM CDT (02:52 UTC)
Expired: Apr 21, 1996, 11:00 PM CDT
In force: 68 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 02:51 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.

What was reported inside it

Time	Report	Where
Apr 21, 10:10 PM CDT	Hail 1.75	Denison Dam, OK
Apr 21, 10:20 PM CDT	Hail 1.75	Durant, OK
Apr 21, 11:05 PM CDT	Hail 2	Achille, OK
Apr 21, 11:05 PM CDT	Hail 1.75	Durant, 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.

The nearest sounding before it

Fort Worth, TX (KFWD), launched 00:00Z, 2.9 hours before the alert went out and 158 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 1644 J/kg
Mixed-layer CIN: -22 J/kg
Mixed-layer LCL: 1764 m above ground
0-6 km bulk shear: 53 kt
0-1 km storm-relative helicity: 159 m²/s²
0-3 km storm-relative helicity: 305 m²/s²
Significant tornado parameter: 0.6
Supercell composite: 12.0

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KOKC 220254
TOROKC
OKC013-220400-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE OKLAHOMA CITY OK
952 PM CDT SUN APR 21 1996

THE NATIONAL WEATHER SERVICE IN OKLAHOMA CITY HAS ISSUED A
TORNADO WARNING EFFECTIVE UNTIL 1100 PM CDT FOR PEOPLE IN THE
FOLLOWING COUNTIES

IN SOUTHEASTERN OKLAHOMA
     BRYAN

INCLUDING THE FOLLOWING LOCATIONS
     ACHILLE...CALERA...COLBERT...HENDRIX...KEMP...PLATTER...
     ROBERTA AND UTICA

AT 952 PM CDT DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF
PRODUCING A TORNADO JUST SOUTH OF THE RED RIVER IN GRAYSON COUNTY TEXAS.
THIS STORM WILL TRACK EAST-NORTHEAST AT 30 MPH ACROSS SOUTHEAST SECTIONS
OF LAKE TEXOMA INTO SOUTHERN BRYAN COUNTY.

BASEBALL SIZE HAIL MAY ACCOMPANY THIS STORM.

TORNADOES ARE ESPECIALLY DANGEROUS AT NIGHT BECAUSE THEY ARE
HARD TO SEE.  TAKE COVER NOW.  A BASEMENT OFFERS THE BEST
PROTECTION. IF NO BASEMENT IS AVAILABLE...SEEK SHELTER IN A
SMALL INTERIOR ROOM SUCH AS A CLOSET ON THE LOWEST  FLOOR. YOU
MAY ONLY HAVE A FEW SECONDS.  ABANDON CARS AND MOBILE HOMES FOR
A REINFORCED BUILDING OR GET INTO A DITCH OR CULVERT.  REMAIN
UNDER COVER UNTIL YOU ARE CERTAIN THE STORM IS PAST.


LAT...LON 3371  963(4 3383  9657 3399  9656 3398  9613
DA

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.

NWS Norman, OK wrote its last area forecast discussion before this tornado warning went out at Apr 21, 9:18 PM CDT, 34 minutes earlier.

Area forecast discussion, Apr 21, 9:18 PM CDT, 34 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE OKLAHOMA CITY OK
918 PM CDT SUN APR 21 1996

MST OF THE SVR TSTMS NOW SEEM TO BE ALG THE RED RIVER IN SCNTRL OK BUT
SCT ACTIVITY OF LESSER INTENSITY STILL CONTS TO EXTEND WWD INTO WCNTRL
OK. DO NOT PLAN TO MAKE MAJOR CHGS TO ZONES ATTM.

FCSTID = 12

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

In the hours before

Local storm report, Apr 21, 4:24 PM CDT, 5 hours 28 minutes before

LOCAL STORM REPORT
NATIONAL WEATHER SERVICE OKLAHOMA CITY OK
420 PM CDT SUN APR 21 1996

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

250 PM       4 S VERNON               TX       2.5 INCH HAIL
04/21/96     WILBARGER

305 PM       8 N STILLWATER           OK       2.5 INCH HAIL
04/21/96     PAYNE

309 PM       3 N ELECTRA              TX       0.75 INCH HAIL
04/21/96     WICHITA

335 PM       LAKE KICKAPOO            TX       1.75 INCH HAIL
04/21/96     ARCHER

340 PM       TIPTON                   OK       2.75 INCH HAIL
04/21/96     TILLMAN

358 PM       WICHITA FALLS            TX       1.75 INCH HAIL
04/21/96     WICHITA

420 PM       10 NE PERRY              OK       0.75 INCH HAIL
04/21/96     NOBLE

FM

Local storm report, Apr 21, 5:49 PM CDT, 4 hours 3 minutes before

LOCAL STORM REPORT
NATIONAL WEATHER SERVICE OKLAHOMA CITY OK
550 PM CDT SUN APR 21 1996

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

345 PM       SNYDER                   OK       1.00 INCH HAIL
04/21/96     KIOWA

415 PM       ROOSEVELT                OK       1.50 INCH HAIL
04/21/96     KIOWA

430 PM       LAKE KICKAPOO            TX       1.75 INCH HAIL
04/21/96     WICHITA

430 PM       ELECTRA                  TX       0.75 INCH HAIL
04/21/96     WICHITA

430 PM       MEERS                    OK       0.75 INCH HAIL
04/21/96     COMANCHE

435 PM       3 E WALTERS              OK       0.75 INCH HAIL
04/21/96     COTTON

456 PM       GRANDFIELD               OK       0.88 HAIL
04/21/96     TILLMAN

458 PM       3 SE HOLLIDAY            TX       1.75 INCH HAIL
04/21/96     ARCHER

500 PM       SEYMOUR                  TX       2.75 INCH HAIL
04/21/96     BAYLOR

504 PM       ADDINGTON                OK       1.75 INCH HAIL
04/21/96     JEFFERSON

505 PM       7 E ADDINGTON            OK       1.75 INCH HAIL
04/21/96     JEFFERSON                         COVERING GROUND

510 PM       MABELLE                  TX       2.75 INCH HAIL
04/21/96     BAYLOR

523 PM       12 E COMANCHE            OK       2.50 INCH HAIL
04/21/96     STEPHENS

525 PM       2 E WALTERS              OK       0.75 INCH HAIL
04/21/96     COTTON

525 PM       9 S ELECTRA              TX       1.75 INCH HAIL
04/21/96     WICHITA

530 PM       5 N HEALDTON             OK       1.00 INCH HAIL
04/21/96     CARTER

DMD(

Local storm report, Apr 21, 6:59 PM CDT, 2 hours 53 minutes before

LOCAL STORM REPORT
NATIONAL WEATHER SERVICE OKLAHOMA CITY OK
7 00 PM CDT SUN APR 21 1996

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

530 PM       PERTOLIA                 TX       1.75 INCH HAIL
04/21/96     CLAY

547 PM       ELECTRA                  TX       0.88 INCH HAIL
04/21/96     WICHITA

554 PM       LAWTON                   OK       1.75 INCH HAIL
04/21/96    P COMANCHE

557 PM       1 E WAURIKA              OK       2.75 INCH HAIL
04/21/96     JEFFERSON

612 PM       10 S ELECTRA             TX       2.50 INCH HAIL
04/21/96

PURPURA

Local storm report, Apr 21, 7:59 PM CDT, 1 hour 53 minutes before

LOCAL STORM REPORT
NATIONAL WEATHER SERVICE OKLAHOMA CITY OK
8 00 PM CDT SUN APR 21 1996

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

620 PM       FREDERICK                OK       LIGHTNING
04/21/96     TILLMAN                           *** 1 INJ***
                                               STORM SPOTTER/CHASER
                                               STRUCK BY LIGHTNING WHILE
                                               VIDEOTAPING A STORM WHILE
                                               STANDING NEXT TO HIS
                                               TRUCK.

PURPURA

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 21, 7:07 PM CDT	Severe Thunderstorm Warning	OUN	Canadian, Grady, Oklahoma	53 min
Apr 21, 7:12 PM CDT	Severe Thunderstorm Warning	OUN	Comanche, Tillman	63 min
Apr 21, 7:12 PM CDT	Severe Thunderstorm Warning	OUN	Caddo	63 min
Apr 21, 7:17 PM CDT	Severe Thunderstorm Warning	OUN	Garfield, Noble	43 min
Apr 21, 7:21 PM CDT	Tornado Warning	OUN	Hughes, Pontotoc	39 min
Apr 21, 7:21 PM CDT	Tornado Warning	OUN	Murray	39 min
Apr 21, 7:43 PM CDT	Severe Thunderstorm Warning	OUN	Washita	62 min
Apr 21, 7:49 PM CDT	Severe Thunderstorm Warning	OUN	Logan	41 min
Apr 21, 7:55 PM CDT	Tornado Warning	OUN	Hughes, Pontotoc	50 min
Apr 21, 8:04 PM CDT	Severe Thunderstorm Warning	OUN	Noble	41 min
Apr 21, 8:12 PM CDT	Severe Thunderstorm Warning	OUN	Payne	48 min
Apr 21, 8:16 PM CDT	Severe Thunderstorm Warning	OUN	Comanche, Grady	44 min
Apr 21, 8:20 PM CDT	Severe Thunderstorm Warning	OUN	Blaine, Caddo, Canadian	40 min
Apr 21, 8:28 PM CDT	Severe Thunderstorm Warning	OUN	Garfield	47 min
Apr 21, 8:30 PM CDT	Severe Thunderstorm Warning	OUN	Jefferson	60 min
Apr 21, 8:37 PM CDT	Tornado Warning	OUN	Hughes	38 min
Apr 21, 8:38 PM CDT	Severe Thunderstorm Warning	OUN	Canadian, Oklahoma	37 min
Apr 21, 8:52 PM CDT	Severe Thunderstorm Warning	OUN	Love	68 min
Apr 21, 9:27 PM CDT	Severe Thunderstorm Warning	OUN	Seminole	33 min
Apr 21, 9:40 PM CDT	Severe Thunderstorm Warning	OUN	Garvin, McClain, Pontotoc	50 min
Apr 21, 9:40 PM CDT	Severe Thunderstorm Warning	OUN	Pottawatomie	50 min
Apr 21, 9:43 PM CDT	Severe Thunderstorm Warning	OUN	Love	62 min
Apr 21, 10:05 PM CDT	Severe Thunderstorm Warning	OUN	Caddo, Canadian	40 min
Apr 21, 10:32 PM CDT	Severe Thunderstorm Warning	OUN	Love, Marshall	58 min
Apr 21, 10:34 PM CDT	Severe Thunderstorm Warning	OUN	Grady	41 min
Apr 21, 10:44 PM CDT	Severe Thunderstorm Warning	OUN	Cleveland	46 min
Apr 21, 10:52 PM CDT	Severe Thunderstorm Warning	OUN	Atoka, Bryan	68 min
Apr 21, 11:00 PM CDT	Tornado Warning	OUN	Bryan	45 min
Apr 21, 11:18 PM CDT	Severe Thunderstorm Warning	OUN	Pottawatomie, Seminole	27 min
Apr 21, 11:31 PM CDT	Severe Thunderstorm Warning	OUN	Seminole	29 min
Apr 21, 11:42 PM CDT	Severe Thunderstorm Warning	OUN	Atoka, Bryan, Pushmataha	63 min
Apr 21, 11:42 PM CDT	Severe Thunderstorm Warning	OUN	Marshall	63 min
Apr 21, 11:48 PM CDT	Severe Thunderstorm Warning	OUN	Garvin, McClain, Pontotoc	27 min
Apr 21, 11:48 PM CDT	Severe Thunderstorm Warning	OUN	Pottawatomie, Seminole	27 min
Apr 21, 11:59 PM CDT	Tornado Warning	OUN	Pushmataha	61 min
Apr 22, 12:15 AM CDT	Severe Thunderstorm Warning	OUN	Hughes, Seminole	45 min
Apr 22, 12:39 AM CDT	Severe Thunderstorm Warning	OUN	Bryan	51 min
Apr 22, 12:49 AM CDT	Severe Thunderstorm Warning	OUN	Pontotoc	41 min
Apr 22, 12:50 AM CDT	Severe Thunderstorm Warning	OUN	Choctaw	40 min
Apr 22, 1:17 AM CDT	Severe Thunderstorm Warning	OUN	Coal, Hughes, Pontotoc	43 min
Apr 22, 1:33 AM CDT	Severe Thunderstorm Warning	OUN	Garvin, Murray, Pontotoc	42 min
Apr 22, 1:40 AM CDT	Severe Thunderstorm Warning	OUN	Bryan, Choctaw	50 min
Apr 22, 2:29 AM CDT	Severe Thunderstorm Warning	OUN	Choctaw	46 min
Apr 22, 2:35 AM CDT	Severe Thunderstorm Warning	OUN	Coal, Johnston, Pontotoc	40 min
Apr 22, 4:04 AM CDT	Severe Thunderstorm Warning	OUN	Pushmataha	41 min
Apr 22, 4:07 AM CDT	Severe Thunderstorm Warning	OUN	Jefferson	68 min
Apr 22, 4:43 AM CDT	Severe Thunderstorm Warning	OUN	Pushmataha	32 min

Nearby

Tornado Warnings in Oklahoma, 1996 Every tornado warning in 1996 Tornadoes 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; radar from the NEXRAD Level II archive.