Alert archive / Oklahoma / Severe Thunderstorm Warnings in 1987

Severe Thunderstorm Warning 20, NWS Tulsa, OK

May 5, 1987Sequoyah County, Oklahoma; Crawford County, Arkansas

NWS Tulsa, OK issued this severe thunderstorm warning at May 5, 1987, 6:17 PM CDT for Sequoyah County, Oklahoma; Crawford County, Arkansas. It was in force for 58 min.

The area

The counties it named.

The facts

Issued: May 5, 1987, 6:17 PM CDT (23:17 UTC)
Expired: May 5, 1987, 7:15 PM CDT
In force: 58 min
Issued by: NWS Tulsa, OK
Area: Whole counties

Counties Crawford County, AR, 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, 11.3 hours before the alert went out and 164 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: 122 J/kg
Mixed-layer CIN: -143 J/kg
Mixed-layer LCL: 797 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: 78 m²/s²
0-3 km storm-relative helicity: 101 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

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

Local storm report, May 5, 1:24 PM CDT, 4 hours 53 minutes before

STORM REPORT
NATIONAL WEATHER SERVICE TULSA, OK
124 PM CDT TUE MAY 05 1987

 TIME/CST COUNTY      EVENT  (CD=CIVIL DEFENSE  OHP=OK HIGHWAY PAT'L)
 120  PM  TULSA       SMALL HAIL REPORTED ABOUT 2 MILES WEST OF
                      OWASSO OKLAHOMA.  REPORT THRU OWASSO POLICE.

Local storm report, May 5, 1:50 PM CDT, 4 hours 27 minutes before

STORM REPORT
NATIONAL WEATHER SERVICE TULSA, OK
148 PM CDT TUE MAY 05 1987

 TIME/CST COUNTY      EVENT  (CD=CIVIL DEFENSE  OHP=OK HIGHWAY PAT'L)
                      SMALL HAIL WAS REPORTED ABOUT 1 1/2 MI=LES
                      NORTH OF OWASSO AT 96TH STREET AND HIGHWAY 169.
                      REPORT FROM THE OWASSO PD.

Local storm report, May 5, 1:51 PM CDT, 4 hours 26 minutes before

STORM REPORT CORRECTED
NATIONAL WEATHER SERVICE TULSA, OK
150 PM CDT TUE MAY 05 1987

 TIME/CDT COUNTY      EVENT  (CD=CIVIL DEFENSE  OHP=OK HIGHWAY PAT'L)
 132 PM   TULSA       SMALL HAIL WAS REPORTED AABOUT 1 1/2 MILES
                      NORTH OF OWASSO AT 96TH STREET AND HIGHWAY 169.
                      REPORT FROM THE OWASSO PD.

Local storm report, May 5, 4:07 PM CDT, 2 hours 10 minutes before

STORM REPORT
NATIONAL WEATHER SERVICE TULSA, OK
407 PM CDT TUE MAY 05 1987

 TIME/CDT COUNTY      EVENT  (CD=CIVIL DEFENSE  OHP=OK HIGHWAY PAT'L)
 300 PM   TULSA       SMALL HAIL TO MARBLE SIZE REPORTED NEAR BROKEN
                      ARROW.  REPORT FROM PD.
 310 PM   TULSA       MARBLE SIZE HAIL REPORTED BY CIVIL DEFENSE IN
                      NORTHWEST PART OF TULSA CITY LIMITS ABOUT 2
                      MILES NORTHWEST OF TUL.
 315 PM   TU,LSA       DIME TO NICKLE SIZE HAIL REPORTED IN NORTH
                      PART OF BROKEN ARROW.  REPORT FROM HAM SPOTTERS.
 333 PM   TULSA       HAIL 1/2 INCH IN DIAMETER REPORTED AT N.W.S
                      AT TULSA INTERNATIONAL AIRPORT.

Special weather statement, May 5, 4:28 PM CDT, 1 hour 49 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE TULSA, OK
427 PM CDT TUE MAY 05 1987

AT 428 PM CDT TULSA RADAR WAS SHOWING A STRONG THUNDERSTORM
IN THE EXTREME SOUTH PART OF ROGERS COUNTY MOVING TO THEP
NORTHEAST AT 20 MPH.  DURING THE LAST 30 MINUTES THIS STORM
HAS DECREASE IN STRENGHT.

A SEVERE THUNDERSTORM WATCH CONTINUES FOR A LARGE PART OF
EASTERN OKLAHOMA UNTIL 8 PM CDT THIS EVENING.

The office that day

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

Issued	Product	Office	Counties	Lasted
May 5, 3:32 PM CDT	Severe Thunderstorm Warning	TSA	Rogers, Wagoner	58 min
May 5, 4:50 PM CDT	Severe Thunderstorm Warning	TSA	Mayes	55 min
May 5, 6:14 PM CDT	Severe Thunderstorm Warning	TSA	Cherokee, Delaware	61 min
May 5, 5:28 PM CDT	Severe Thunderstorm Warning	TSA	Sebastian	62 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 1987 Severe Thunderstorm Warnings in Arkansas, 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.