Alert archive / Oklahoma / Tornado Warnings in 1990

Tornado Warning 40, NWS Norman, OK

May 31, 1990Harmon County, Oklahoma

NWS Norman, OK issued this tornado warning at May 31, 1990, 9:21 PM CDT for Harmon County, Oklahoma. It was in force for 54 min. 1 report 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
May 31, 1990, 9:21 PM CDT (02:21 UTC)
Expired
May 31, 1990, 10:15 PM CDT
In force
54 min
Issued by
NWS Norman, OK
Area
Whole counties

County Harmon County, OK

The radar

The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.

What was reported inside it

TimeReportWhereRemark
May 31, 9:30 PM CDTThunderstorm Wind 0Harmon, 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

Amarillo Airport, TX (KAMA), launched 00:00Z, 2.4 hours before the alert went out and 177 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, Amarillo Airport, TX at 00:00Z on 1990-06-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 49 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, Amarillo Airport, TX at 00:00Z on 1990-06-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 9 square meters per square second.193958Sfc1 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
49 J/kg
Mixed-layer CIN
-2 J/kg
Mixed-layer LCL
3540 m above ground
0-6 km bulk shear
32 kt
0-1 km storm-relative helicity
9 m²/s²
0-3 km storm-relative helicity
54 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KOKC 010224
TOROKC
OKC057-010315-
 
BULLETIN - EBS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE OKLAHOMA CITY OK
921 PM CDT THU MAY 31 1990
 
THE NATIONAL WEATHER SERVICE IN OKLAHOMA CITY HAS ISSUED A
TORNADO WARNING EFFECTIVE UNTIL 1015 PM CDT
FOR THE FOLLOWING OKLAHOMA LOCATIONS...
 
IN SOUTHWEST OKLAHOMA
 
   ...NORTHERN HARMON COUNTY
 
AT 921 PM RADAR INDICATED A POSSIBLE TORNADO NEAR VINSON MOVING SLOWLY
TO THE SOUTHEAST. IF YOU LIVE IN VINSON YOU ARE NEAR THE PATH OF THIS
STORM.
 
 
IF YOU ARE IN THE PATH OF A TORNADO...THE SAFEST PLACE IS A
BASEMENT.  GET UNDER A WORKBENCH OR PIECE OF STURDY FURNITURE.
IF NO BASEMENT IS AVAILABLE...SEEK SHELTER IN AN INTERIOR ROOM
SUCH AS A CLOSET ON THE LOWEST FLOOR.  USE BLANKETS...PILLOWS...
OR CUSHIONS TO COVER YOUR BODY.  AVOID WINDOWS.

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.

In the hours before

Special weather statement, May 31, 4:56 PM CDT, 4 hours 25 minutes before
OKZ023-024-312300-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE OKLAHOMA CITY OK
450 PM CDT THU MAY 31 1990

...THUNDERSTORMS PRODUCING HEAVY RAINFALL MOVING INTO SOUTHERN
   OKLAHOMA...

AT 450 PM NATIONAL WEATHER SERVICE RADAR INDICATED AN AREA OF
THUNDERSTORMS ALONG AND JUST SOUTH OF THE RED RIVER FROM SOUTH OF
DURANT TO SOUTH OF THACKERVILLE. BRIEF HEAVY RAINFALL...GUSTY WINDS
AND PERHAPS SOME SMALL HAIL MAY ACCOMPANY THESE STORMS AS THEY MOVE
NORTH-NORTHEASTWARD AT 20 MPH.

IN ADDITION TO HEAVY RAINFALL...THESE STORMS WILL LIKELY PRODUCE
FREQUENT LIGHTNING. BOATERS AND CAMPERS IN THE LAKE TEXOMA AREA
SHOULD REMAIN ALERT FOR THE APPROACH OF THUNDERSTORMS AND
BE PREPARED TO MOVE TO SHELTER.
Special weather statement, May 31, 7:36 PM CDT, 1 hour 45 minutes before
OKZALL-010200-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE OKLAHOMA CITY OK
730 PM CDT THU MAY 31 1990

...INTENSE THUNDERSTORMS OVER THE TEXAS PANHANDLE ARE MOVING TOWARD
OKLAHOMA...

...TORNADO WATCH NUMBER 356 REMAINS IN EFFECT UNTIL 9 PM FOR PARTS OF
WESTERN OKLAHOMA AND THE EASTERN OKLAHOMA PANHANDLE...

AT 730 PM CDT RADAR INDICATED TWO AREAS OF INTENSE THUNDERSTORMS OVER
THE TEXAS PANHANDLE. THE FIRST STORM...WHICH HAS HAD A HISTORY OF
PRODUCING TORNADOES...WAS OVER WESTERN OCHILTREE COUNTY AND WAS MOVING
EASTWARD AT 25 MILES PER HOUR. IF THIS STORM HOLDS TOGETHER...IT WILL
MOVE INTO WESTERN ELLIS COUNTY AROUND 930 PM CDT.

ANOTHER AREA OF INTENSE THUNDERSTORMS WAS OVER EASTERN DONLEY AND
WESTERN COLLINGSWORTH COUNTIES OF THE EASTERN TEXAS PANHANDLE. THESE
STORMS WERE MOVING TOWARD THE NORTHEAST AT 20 MILES PER HOUR AND
LIKELY WILL MOVE INTO WESTERN BECKHAM COUNTY BETWEEN 830 AND 900 PM
CDT.

OTHER STORMS WERE BUILDING RAPIDLY OVER SOUTHERN COMANCHE COUNTY SOUTH
OF CACHE.

THE ATMOSPHERE OVER OKLAHOMA IS EXTREMELY UNSTABLE THIS EVENING...AND
THE WIND PROFILE REMAINS FAVORABLE FOR TORNADIC THUNDERSTORMS OVER THE
TEXAS PANHANDLE AND NORTHWESTERN OKLAHOMA THIS EVENING. OVER MOST OF
THE REMAINDER OF OKLAHOMA...THE MAIN THREAT WILL BE LARGE HAIL AND
HEAVY RAINFALL.

THE NATIONAL WEATHER SERVICE WILL CONTINUE TO MONITOR THE
THUNDERSTORMS THROUGHOUT THE EVENING. STAY TUNED TO NOAA WEATHER RADIO
OR TO COMMERCIAL RADIO OR TELEVISION FOR LATER UPDATES AND POSSIBLE
WARNINGS.
Special weather statement, May 31, 8:01 PM CDT, 1 hour 20 minutes before
OKZ014-021-010200-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE OKLAHOMA CITY OK
800 PM CDT THU MAY 31 1990

HEAVY THUNDERSTORMS DEVELOPING OVER HARMNON AND BECKHAM COUNTIES...

TORNADO WATCH NUMBER 356 IS IN EFFECT UNTIL 9 PM FOR PORTIONS OF
WESTERN OKLAHOMA AND THE EASTERN OKLAHOMA PANHANDLE.

AT 800 PM RADAR INDICATED RAPIDLY INTESIFYING THUNDERSTORMS OVER
SOUTHERN BECKHAM AND HARMON COUNTIES.  THE STORMS EXTENDED FROM 5
MILES SOUTHWEST OF ERICK SOUTHWARD TO 5 MILES SOUTHEAST OF VINSON. THE
STORMS WERE MOVING EAST NORTHEAST AT 20 MPH.
Special weather statement, May 31, 8:21 PM CDT, 1 hour before
TXZ020-019-010300-
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE WICHITA FALLS TX
820 PM CDT THU MAY 31 1990

...TORNADO WATCH IN EFFECT UNTIL 900 PM CDT FOR FOARD AND HARDEMAN
COUNTIES...

AT 815 PM WICHITA FALLS RADAR SHOWED STRONG THUNDERSTORMS OVER
SOUTHERN YOUNG COUNTY AND OVER SOUTHERN BAYLOR COUNTY. THE THUNDERSTORM
OVER YOUNG COUNTY WAS MOVING SLOWLY TO THE NORTH AND WILL PROBABLY
BE IN THE GRAHAM AREA BY 830 PM. THE STORM OVER BAYLOR COUNTY WAS MOVING
TOWARD SEYMOUR AND SHOULD SOON BE IN THE SEYMOUR AREA. SMALL HAIL
AND GUSTY WINDS WILL PROBABLY OCCUR WITH THESE THUNDERSTORMS.

OTHER THUNDERSTORMS WERE LOCATED OVER SOUTHWESTERN OKLAHOMA AND IN  THE
EASTERN TEXAS PANHANDLE AND EXTENDED INTO THE SOUTH PLAINS. THE STORMS
IN THE PANHANDLE WERE MOVING TO THE NORTHEAST AT 25 MPH.
Special weather statement, May 31, 9:16 PM CDT, 5 minutes before
OKZ021-014-010230-

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE OKLAHOMA CITY OK
913 PM CDT THU MAY 31 1990

...TORNADO WARNING FOR GREER COUNTY UNTIL 930 PM...
...SEVERE THUNDERSTORM WARNING FOR BECKHAM COUNTY UNTIL 930 PM...
...SEVERE THUNDERSTORM WARNING FOR HARMON COUNTY UNTIL 1000 PM...

AT 913 RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A
TORNADO IN WESTERN GREER COUNTY 5 MILES NORTH OF REED. MOVEMENT WAS
EAST-SOUTHEAST AT 15 MPH.

ANOTHER SEVERE THUNDERSTORM WAS ALONG THE BECKHAM-GREER COUNTY LINE
SOUTHEAST OF ERICK. MOVING EAST AT 20 MPH.

A SEVERE THUNDERSTORM CAPABLE OF PRODUCING LARGE HAIL AND STRONG
WINDS WAS ALONG THE TEXAS BORDER WEST OF HOLLIS MOVING EAST AT 20
MPH. SEVERE THUNDERSTORMS MAY PRODUCE TORNADOES WITH LITTLE OR NO
ADVANCE WARNING.
Special weather statement, May 31, 9:18 PM CDT, 3 minutes before
TXZ020-019-010330-
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE WICHITA FALLS TX
915 PM CDT THU MAY 31 1990

THE TORNADO WATCH FOR FOARD AND HARDEMAN COUNTIES HAS BEEN EXTENDED
UNTIL 1 AM AND NOW INCLUDES WILBARGER.

AT 915 PM WICHITA FALLS RADAR SHOWED THUNDERSTORMS YOUNG COUNTY AND
NORTH OF SEYMOUR. MOVEMENT WAS SLOWLY NORTH.

OTHER MORE INTENSE THUNDERSTORMS WERE FROM NORTH OF ALTUS TO JUST WEST
OT TRUSCOTT. THE STORM ENTERING NORTHWEST FOARD COUNTY IS VERY STRONG
AND LIKELY CONTAINS SMALL HAIL AND GUSTY WINDS. MOVEMENT WAS NORTHEAST
AT 25 MPH.

A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR SEVERE STORMS AND
POSSIBLE TORNADOES TO DEVELOP QUICKLY. STAY ALERT...BUT BE PREPARE$D TO
MOVE TO A PLACE OF SAFTEY.

The office that day

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

IssuedProductOfficeCountiesLasted
May 31, 8:23 PM CDTSevere Thunderstorm WarningOUNBeckham, Greer67 min
May 31, 8:41 PM CDTTornado WarningOUNGreer49 min
May 31, 8:59 PM CDTSevere Thunderstorm WarningOUNHarmon61 min
May 31, 9:10 PM CDTFlash Flood WarningOUNBeckham, Greer, Harmon3 hr
May 31, 9:26 PM CDTSevere Thunderstorm WarningOUNGreer64 min
May 31, 9:57 PM CDTSevere Thunderstorm WarningOUNJackson63 min
May 31, 10:47 PM CDTFlash Flood WarningOUNGreer, Jackson2 hr
May 31, 11:27 PM CDTSevere Thunderstorm WarningOUNTillman63 min
Jun 1, 8:55 AM CDTSevere Thunderstorm WarningOUNGreer, Jackson, Kiowa65 min

Nearby

Tornado Warnings in Oklahoma, 1990Every tornado warning in 1990Tornadoes in 1990

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.