Alert archive / Oklahoma / Severe Thunderstorm Warnings in 1987

Severe Thunderstorm Warning 68, NWS Tulsa, OK

July 18, 1987Tulsa County, Oklahoma

NWS Tulsa, OK issued this severe thunderstorm warning at Jul 18, 1987, 1:45 AM CDT for Tulsa County, Oklahoma. It was in force for 45 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: Jul 18, 1987, 1:45 AM CDT (06:45 UTC)
Expired: Jul 18, 1987, 2:30 AM CDT
In force: 45 min
Issued by: NWS Tulsa, OK
Area: Whole counties

County Tulsa 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

Time	Report	Where	Remark
Jul 18, 1:50 AM CDT	Thunderstorm Wind 0	Tulsa, 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

Ok Cty/Will Rgrs, OK (KOKC), launched 00:00Z, 6.8 hours before the alert went out and 170 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: 2242 J/kg
Mixed-layer CIN: -2 J/kg
Mixed-layer LCL: 626 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 322 m²/s²
0-3 km storm-relative helicity: 573 m²/s²
Significant tornado parameter: 3.0
Supercell composite: 18.5

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KTUL 180649
SVRTUL
OKC143-180730-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TULSA OK
145 AM CDT SAT JUL 18 1987
 
THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING
EFFECTIVE UNTIL  230 AM CDT FOR PEOPLE IN THE FOLLOWING COUNTY...
 
IN NORTHEAST OKLAHOMA
          ...TULSA
 
AT 1 45 AM THE TULSA WEATHER RADAR INDICATED A SEVERE THUNDERSTORM 5
MILES SOUTH OF SAND SPRINGS MOVING TO THE NORTHEAST AT 20 MPH. VERY
HEAVY RAIN...SMALL HAIL...AND WIND DAMAGE HAVE ALL BEEN REPORTED WITH
THIS STORM.
 
SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 60 MPH...
LARGE HAIL...DEADLY LIGHTNING AND VERY HEAVY RAIN.  FOR YOUR
PROTECTION@ MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR
HOME OR BUSINESS.

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 18, 1:05 AM CDT	Severe Thunderstorm Warning	TSA	Creek	55 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.