Alert archive / Oklahoma / Severe Thunderstorm Warnings in 1991
Severe Thunderstorm Warning 21, NWS Shreveport, LA
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
| Time | Report | Where | Remark |
|---|---|---|---|
| Mar 21, 8:50 PM CST | Thunderstorm Wind 0 | Mccurtain, OK | |
| Mar 21, 9:03 PM CST | Hail 1.75 | Mccurtain, OK | |
| Mar 21, 9:25 PM CST | Hail 1 | Mccurtain, 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.
- 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
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.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 21, 7:46 PM CST | Severe Thunderstorm Warning | SHV | McCurtain | 59 min |
| Mar 22, 4:03 AM CST | Severe Thunderstorm Warning | SHV | McCurtain | 57 min |
| Mar 22, 8:09 AM CST | Flash Flood Warning | SHV | McCurtain | 4 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.