Alert archive / Oklahoma / Severe Thunderstorm Warnings in 1987

Severe Thunderstorm Warning 85, NWS Tulsa, OK

August 26, 1987Sequoyah County, Oklahoma

NWS Tulsa, OK issued this severe thunderstorm warning at Aug 26, 1987, 5:32 PM CDT for Sequoyah County, Oklahoma. It was in force for 58 min.

The area

The counties it named.

The facts

Issued: Aug 26, 1987, 5:32 PM CDT (22:32 UTC)
Expired: Aug 26, 1987, 6:30 PM CDT
In force: 58 min
Issued by: NWS Tulsa, OK
Area: Whole counties

County Sequoyah County, OK

The radar

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

The nearest sounding before it

Springfield, MO (KUMN), launched 12:00Z, 10.5 hours before the alert went out and 178 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: 300 J/kg
Mixed-layer CIN: -165 J/kg
Mixed-layer LCL: 1410 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 229 m²/s²
0-3 km storm-relative helicity: 220 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 KFSM 262232
SVRFSM
ARC143-OKC135-262330-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE FORT SMITH AR
532 PM CDT WED AUG 26 1987
 
THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING
EFFECTIVE UNTIL  630 PM CDT FOR PEOPLE IN THE FOLLOWING COUNTIES...
 
IN WEST ARKANSAS
          ...WASHINGTON
IN NORTHEAST OKLAHOMA
          ...SEQUOYAH
 
AT 535 PM CDT RADAR INDICATED A LINE OF VERY STRONG THUNDERSTORMS
FROM 15 MILES SOUTHWEST OF FAYETTEVILLE ARKANSAS TO 10 MILES
SOUTHWEST OF SALLISAW OKLAHOMA MOVING NORTHEAST AT 30 MILES AN HOUR.
 
 
SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 55
MPH...DESTRUCTIVE HAIL...DEADLY LIGHTNINCG...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, Aug 26, 2:07 PM CDT, 3 hours 25 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE TULSA, OK
207 PM CDT WED AUG 26 1987

   ...INTENSE THUNDERSTORMS ARE FORMING OVER NORTHEASTERN OKLAHOMA...

THUNDERSTORMS ARE FORMING OVER NORTHEASTERN OKLAHOMA AHEAD OF A COLD
FRONT THAT IS CURRENTLY IN THE NORTH AND CENTRAL SECTIONS OF THE STATE.

AT 2 PM THE TULSA WEATHER RADAR INDICATED AN INTENSE THUNDERSTORM 5 MILES
EAST OF CLAREMORE...NEAR THE ROGERS AND MAYES COUNTY LINE. THIS STORM
WAS MOVING TO THE NORTHEAST AT 25 MPH.

PERSONS IN THE PATH OF THIS STORM CAN EXPECT WINDS TO 50 MILES AN HOUR
...HEAVY RAINS...AND SMALL HAIL.  YOU SHOULD TAKE COVER IF THREATENING
WEATHER APPROACHES AND STAY TUNED TO NOAA WEATHER RADIO FOR THE LATEST
INFORMATION.

MT

Special weather statement, Aug 26, 3:13 PM CDT, 2 hours 19 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE TULSA, OK
306 PM CDT WED AUG 26 1987

 ...THUNDERSTORMS DECREASE IN INTENSITY OVER NORTHEASTERN OKLAHOMA...

THE INTENSE THUNDERSTORMS THAT WERE OVER ROGERS AND MAYES COUNTIES
HAVE DECREASED IN INTENSITY IN THE PAST HALF HOUR. STRONG THUNDERSTORMS
REMAIN OVER MUCH OF NORTHEASTERN OKLAHOMA...AND ARE LIKELY FOR SEVERAL
MORE HOURS UNTIL A COLD FRONT CLEARS THE TULSA METRO AREA SOMETIME AFTER
7 PM.

REPORTS OF VERY HEAVY RAINS AND SMALL HAIL HAVE BEEN RECEIVED FROM THE
CLAREMORE POLICE DEPARTMENT...BUT SO FAR NO SEVERE WEATHER HAS BEEN
REPORTED. WITH THE HEAVY RAINS...SOME MINOR STREET FLOODING IS POSSIBLE
IN LOW LYING AREAS. MOTORISTS IN ROGERSN AND MAYES COUNTIES SHOULD BE
ALERT TO THE POSSIBILITY OF STANDING WATER AND USE CAUTION UNTIL THESE
THUNDERSTORMS PASS.

STAY TUNED TO NOAA WEATHER RADIO FOR THE LATEST UPDATES.
MT

Local storm report, Aug 26, 5:08 PM CDT, 24 minutes before

STORM REPORT
NATIONAL WEATHER SERVICE TULSA, OK
506 PM CDT WED AUG 26 1987

 TIME/CST COUNTY      EVENT  (CD=CIVIL DEFENSE  OHP=OK HIGHWAY PAT'L)
 4 30 PM  CHEROKEE    CD DIRECTOR IN TAHLEQUAH REPORTS WINDS TO 60
                      MPH AND GOLF BALL SIZE HAIL IN HULBERT.

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 26, 4:26 PM CDT	Severe Thunderstorm Warning	TSA	Cherokee	49 min
Aug 26, 4:46 PM CDT	Severe Thunderstorm Warning	TSA	Tulsa, Wagoner	54 min
Aug 26, 5:27 PM CDT	Severe Thunderstorm Warning	TSA	Okmulgee	63 min
Aug 26, 6:14 PM CDT	Severe Thunderstorm Warning	TSA	Okfuskee	61 min
Aug 26, 6:38 PM CDT	Severe Thunderstorm Warning	TSA	Okmulgee	42 min
Aug 26, 6:43 PM CDT	Severe Thunderstorm Warning	TSA	Creek, Tulsa	47 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 1987 Every severe thunderstorm warning in 1987

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.