Alert archive / Oklahoma / Severe Thunderstorm Warnings in 1991

Severe Thunderstorm Warning 21, NWS Shreveport, LA

March 21, 1991McCurtain County, Oklahoma

NWS Shreveport, LA issued this severe thunderstorm warning at Mar 21, 1991, 8:45 PM CST for McCurtain County, Oklahoma. It was in force for 75 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
Mar 21, 1991, 8:45 PM CST (02:45 UTC)
Expired
Mar 21, 1991, 10:00 PM CST
In force
75 min
Issued by
NWS Shreveport, LA
Area
Whole counties

County McCurtain County, OK

What was reported inside it

TimeReportWhereRemark
Mar 21, 8:50 PM CSTThunderstorm Wind 0Mccurtain, OK
Mar 21, 9:03 PM CSTHail 1.75Mccurtain, OK
Mar 21, 9:25 PM CSTHail 1Mccurtain, 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

Longview/Gregg, TX (KGGG), launched 00:00Z, 2.8 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, Longview/Gregg, TX at 00:00Z on 1991-03-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2339 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, Longview/Gregg, TX at 00:00Z on 1991-03-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 213 square meters per square second.1939587897117Sfc1 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
2339 J/kg
Mixed-layer CIN
-25 J/kg
Mixed-layer LCL
695 m above ground
0-6 km bulk shear
57 kt
0-1 km storm-relative helicity
213 m²/s²
0-3 km storm-relative helicity
252 m²/s²
Significant tornado parameter
3.6
Supercell composite
12.4

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KSHV 220247
SVRSHV
OKC089-220400-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SHREVEPORT LA
845 PM CST THU MAR 21 1991
 
THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 1000 PM CST
FOR PEOPLE IN THE FOLLOWING LOCATIONS..
 
IN SOUTHEAST OKLAHOMA
 
   ...MCCURTAIN COUNTY
 
AT 840 PM CST THE NATIONAL WEATHER SERVICE RADAR IN SHREVEPORT
INDICATED TWO SEVERE THUNDERSTORMS. ONE THUNDERSTORM WAS LOCATED EAST
OF SMITHVILLE OKLAHOMA AND WILL MOVE EAST NORTHEASTWARD OUT OF
MCCURTAIN COUNTY. THE SECOND SEVERE THUNDERSTORM WAS LOCATED NEAR
SPENCERVILLE OKLAHOMA OR 20 MILES WEST NORTHWEST OF WRIGHT CITY
OKLAHOMA. THIS THUNDERSTORM WAS MOVING TO THE EAST AT 45 MILES PER
HOUR. THE SEVERE THUNDERSTORMS HAVE A HISTORY OF PRODUCING STRONG
GUSTY SURFACE WINDS...LARGE HAIL...AND DANGEROUS LIGHTNING. WIND
DAMAGE MAY OCCUR WITH THE STORMS.
 
A TORNADO WATCH IS ALSO IN EFFECT FOR THE WARNED AREA.  REMEMBER
SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE TORNADOES
WITH LITTLE OR NO ADVANCE WARNING.  REMAIN CALM BUT BE ALERT TO
RAPIDLY CHANGING WEATHER CONDITIONS.
 
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

Special weather statement, Mar 21, 4:29 PM CST, 4 hours 16 minutes before
OKZ040-021-034-TXZ022-023-027-028-032-033-ARZ009-010-011-016-LAZ001-
002-003-004-005-006-220100-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
425 PM CST THU MAR 21 1991

TORNADO WATCH IS IN EFFECT FOR PORTIONS OF NORTHEAST TEXAS AND
SOUTHEAST OKLAHOMA.

AT 420 PM SHREVEPORT WEATHER RADAR SHOWED NO PRECIPITATION IN THE
IMMEDIATE ARKLATEX AREA.  HOWEVER...SEVERE WEATHER IS OCCURRING
IN SOUTHERN OKLAHOMA NEAR ARDMORE.  REFER TO RELEASES BY THE
OKLAHOMA CITY WEATHER OFFICE FOR MORE INFORMATION ABOUT THIS
WEATHER.

STRONG AND POSSIBLY SEVERE STORMS ARE EXPECTED TO MOVE INTO EXTREME
SOUTHEAST OKLAHOMA AND INTO PORTIONS OF NORTHEAST TEXAS AND SOUTH-
WEST ARKANSAS LATER TONIGHT.

PERSONS IN OR CLOSE TO THE TORNADO WATCH AREA ARE ADVISED TO REMAIN
ALERT TO RAPIDLY CHANGING CONDITIONS AND LISTEN FOR LATER STATEMENTS
AND WARNINGS.
Special weather statement, Mar 21, 6:50 PM CST, 1 hour 55 minutes before
OKZ040-021-034-TXZ022-023-027-028-032-033-ARZ009-010-011-016-LAZ001-
002-003-004-005-006-220300-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
643 PM CST THU MARCH 21 199

TORNADO WATCH REMAINS IN EFFECT FOR PORTIONS OF NORTHEAST TEXAS
AND FOR SOUTHEAST OKLAHOMA.

SHREVEPORT WEATHER RADAR AT 640 PM SHOWED A BAND OF STRONG THUNDER-
STORMS FROM WEST OF MENA ARKANSAS WESTWARD ACROSS SOUTHEAST OKLAHOMA
TO THE RED RIVER SOUTHWEST OF ARDMORE OKLAHOMA.  MOVEMENT WAS TO THE
EASTNORTHEAST NEAR 35 MPH.

THE THREAT OF STRONG AND SEVERE THUNDERSTORMS WILL CONTINUE OVER THE
NORTHWESTERN AND NORTHERN SECTIONS OF THE ARKLATEX THIS EVENING.
PERSONS IN OR CLOSE TO THE TORNADO WATCH AREA: ARE ADVISED TO BE ON
THE ALERT FOR RAPIDLY CHANGING WEATHER CONDITIONS AND LISTEN FOR
LATER STATEMENTS AND WARNINGS.
Local storm report, Mar 21, 8:31 PM CST, 14 minutes before
STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
830 PM CST THU MAR 21 1991

STORM REPORT FOR THURSDAY MARCH 21 1991

TIME LST    CNTY/PRSH  ST     EVENT/LOCATION/DAMAGE

 820 PM    MCCURTAIN   OK  .. NICKLE SIZED HAIL AND 50 TO 60 MPH WINDS
                              WITH TREES DOWN NEAR BATTIEST.

The office that day

Everything else NWS Shreveport, LA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Mar 21, 7:46 PM CSTSevere Thunderstorm WarningSHVMcCurtain59 min
Mar 22, 4:03 AM CSTSevere Thunderstorm WarningSHVMcCurtain57 min
Mar 22, 8:09 AM CSTFlash Flood WarningSHVMcCurtain4 hr

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.