Alert archive / Texas / Severe Thunderstorm Warnings in 1996

Severe Thunderstorm Warning 113, NWS Norman, OK

April 21, 1996Clay County, Wichita County, Texas

NWS Norman, OK issued this severe thunderstorm warning at Apr 21, 1996, 4:05 PM CDT for Clay County, Wichita County, Texas. It was in force for 55 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties.

The facts

Issued: Apr 21, 1996, 4:05 PM CDT (21:05 UTC)
Expired: Apr 21, 1996, 5:00 PM CDT
In force: 55 min
Issued by: NWS Norman, OK
Area: Whole counties; the outline is the Mesonet’s reconstruction

Counties Clay County, TX, Wichita County, TX

The radar

The Altus AFB radar (KFDR), 76 km from the middle of the area, began a volume at 21:06 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

Fort Worth, TX (KFWD), launched 12:00Z, 9.1 hours before the alert went out and 156 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: 1461 J/kg
Mixed-layer CIN: -133 J/kg
Mixed-layer LCL: 596 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 188 m²/s²
0-3 km storm-relative helicity: 193 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.5

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KOKC 212108 COR
SVROKC
TXC077-485-212200-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING...CORRECTED TEXT
NATIONAL WEATHER SERVICE OKLAHOMA CITY OK
405 PM CDT SUN APR 21 1996

THE NATIONAL WEATHER SERVICE IN OKLAHOMA CITY HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 500 PM CDT FOR
PEOPLE IN THE FOLLOWING COUNTIES

IN NORTHERN TEXAS
     CLAY AND WICHITA

INCLUDING THE FOLLOWING LOCATIONS
     HENRIETTA...IOWA PARK...KAMAY...SHEPPARD AFB...VALLEY VIEW
     ...WICHITA FALLS...BURKBURNETT AND PETROLIA

AT 405 PM CDT DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM NEAR
BURKBURNETT MOVING EAST-NORTHEAST AT 30 MPH. A SECOND SEVERE
THUNDERSTORM WAS NEAR LAKE ARROWHEAD MOVING NORTHEAST AT 40 MPH. 

EACH OF THESE STORMS MAY CONTAIN TO GOLFBALL SIZE AND WINDS TO 60 MPH.

SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS 60 MPH OR HIGHER...
DESTRUCTIVE HAIL...DEADLY LIGHTNING AND HEAVY RAIN.  MOVE TO AN
INTERIOR ROOM ON THE LOWESTX FLOOR OF YOUR HOME OR BUSINESS.
HEAVY RAINS FLOOD ROADS QUICKLY SO DONT DRIVE INTO AREAS WHERE
WATER COVERS THE ROAD.


LAT...LON 3378  9810 3383  9837 3385  9890 3413  9865
          3406  9807
DA

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 Apr 21, 10:33 AM CDT, 5 hours 32 minutes earlier.

Area forecast discussion, Apr 21, 10:33 AM CDT, 5 hours 32 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE OKLAHOMA CITY OK
1030 AM CDT SUN APR 21 1996

LATEST SFC CHART REVEALS WARM FRONT HAS MOVED N TO THE RED RIVER. SFC
DEW PTS HAVE REACHED THE LWR 60S IN SERN ZNS. EXPECT LOW LVL MOISTURE
TO INCREASE AND DEEPEN ACRS SERN 3/4 OF FA DURG AFTERNOON.

LOW LVL STATUS NR WARM FRONTAL BOUNDARY WL NOT DECREASE IN COVERAGE
UNTIL AFT 18Z...PER 12Z RUC OUTPUT. BUT FEEL SRN ZONES WL WARM QUICKLY
ONCE STATUS BRE|AKS OUT.

PARAMETERS CONTINUE TO BE FAVORABLE FOR SVR CONVECTION ACRS SERN 2/3 OF
FA THIS AFT...ESP AFT 20Z. WL MAKE SOME UPDATES TO 1ST TEMPS BASED ON
LATEST SAO TRENDS.

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

22

In the hours before

Special weather statement, Apr 21, 12:20 PM CDT, 3 hours 45 minutes before

OKZ004>053-TXZ083>090-212130-

THUNDERSTORM OUTLOOK
NATIONAL WEATHER SERVICE OKLAHOMA CITY OK
1230 PM CDT SUN APR 21 1996

THERE IS A MODERATE RISK OF SEVERE THUNDERSTORMS THIS AFTERNOON AND
TONIGHT OVER MUCH OF CENTRAL AND SOUTHERN OKLAHOMA AND WESTERN NORTH
TEXAS. THIS AREA OF MODERATE RISK IN GENERALLY EAST OF A LINE THAT
EXTENDS FROM SEYMOUR...TO HOBART...TO MEFORD. THERE IS A
SIGNIFICANT POTENTIAL FOR TORNADOES IN THIS AREA...IN ADDITION TO LARGE
HAIL AND DAMAGING WINDS. LOCALIZED HEAVY RAINFALL IS ALSO POSSIBLE
ACROSS MUCH OF CENTRAL AND EASTERN OKLAHOMA.

A SLIGHT RISK OF SEVERE THUNDERSTORMS EXISTS THIS AFTERNOON AND EVENING
ACROSS THE REST OF WESTERN OKLAHOMA AND WESTERN NORTH TEXAS. LARGE HAIL
AND DAMAGING WINDS ARE THE PRIMARY THREAT WITH THESE
THUNDERSTORMS...HOWEVER ISOLATED TORNADOES ARE POSSIBLE.

SEVERAL FACTORS WILL COMBINE TO PRODUCE CONDITIONS FAVORABLE FOR SEVERE
THUNDERSTORM DEVELOPMENT. A LOW PRESSURE CENTER WILL CONTINUE TO
DEVELOP ACROSS THE TEXAS PANHANDLE DURING THE AFTERNOON...AS IT MOVES
SLOWLY EAST. COUNTER-CLOCKWISE CIRCULATION AROUND THE LOW WILL HELP PUSH
A WARM FRONT NORTH...ACROSS SOUTHERN OKLAHOMA AND INTO CENTRAL OKLAHOMA
BY LATE AFTERNOON. LOW LEVEL MOISTURE WILL INCREASE RAPIDLY BEHIND THIS
FRONT...BROUGHT BY STRONG SOUTHERLY LOW LEVEL WINDS. THIS WILL INCREASE
INSTABILITY AND PROVIDE FUEL FOR THUNDERSTORMS THAT DEVELOP. IN
ADDITION...STRONG WESTERLY UPPER LEVEL WINDS WILL ENHANCE A VERTICAL
WIND PROFILE FAVORABLE FOR SUPERCELL DEVELOPMENT.

A LACK OF SUFFICIENT LOW LEVEL MOISTURE MAY LIMIT THUNDERSTORM POTENTIAL
IN EXTREME WESTERN SECTIONS OF OKLAHOMA AND WESTERN NORTH TEXAS.

THIS IS A POTENTIALLY DANGEROUS WEATHER SITUATION. PEOPLE ARE URGED TO
REVIEW TORNADO SAFETY RULES AND KEEP ABREAST OF THE LATEST WEATHER
FORECASTS.

EMERGENCY MANAGERS AND STORM SPOTTER GROUPS SHOULD BE PREPARED FOR
ACTIVATION THIS AFTERNOON AND TONIGHT.

22

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 21, 2:25 PM CDT	Severe Thunderstorm Warning	OUN	Wilbarger	50 min
Apr 21, 2:59 PM CDT	Severe Thunderstorm Warning	OUN	Archer, Baylor	61 min
Apr 21, 3:07 PM CDT	Severe Thunderstorm Warning	OUN	Wichita	38 min
Apr 21, 3:14 PM CDT	Severe Thunderstorm Warning	OUN	Wichita	61 min
Apr 21, 3:30 PM CDT	Severe Thunderstorm Warning	OUN	Archer	45 min
Apr 21, 3:44 PM CDT	Tornado Warning	OUN	Archer	46 min
Apr 21, 4:29 PM CDT	Severe Thunderstorm Warning	OUN	Archer	31 min
Apr 21, 4:34 PM CDT	Severe Thunderstorm Warning	OUN	Baylor	26 min
Apr 21, 4:49 PM CDT	Severe Thunderstorm Warning	OUN	Archer, Baylor, Wichita	56 min
Apr 21, 4:49 PM CDT	Severe Thunderstorm Warning	OUN	Clay	56 min
Apr 21, 5:21 PM CDT	Severe Thunderstorm Warning	OUN	Wilbarger	54 min
Apr 21, 5:45 PM CDT	Severe Thunderstorm Warning	OUN	Baylor, Wichita, Wilbarger	60 min
Apr 21, 6:44 PM CDT	Severe Thunderstorm Warning	OUN	Archer, Baylor	46 min

Nearby

Severe Thunderstorm Warnings in Texas, 1996 Every 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.