Alert archive / Oklahoma / Severe Thunderstorm Warnings in 1987
Severe Thunderstorm Warning 310, NWS Norman, OK
NWS Norman, OK issued this severe thunderstorm warning at Sep 15, 1987, 6:30 PM CDT for Oklahoma County, Oklahoma. It was in force for 45 min. 2 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
- Sep 15, 1987, 6:30 PM CDT (23:30 UTC)
- Expired
- Sep 15, 1987, 7:15 PM CDT
- In force
- 45 min
- Issued by
- NWS Norman, OK
- Area
- Whole counties
County Oklahoma 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 |
|---|---|---|---|
| Sep 15, 6:58 PM CDT | Thunderstorm Wind 60 | Oklahoma, OK | |
| Sep 15, 7:25 PM CDT | Hail 0.75 | Oklahoma, 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 12:00Z, 11.5 hours before the alert went out and 24 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
- 52 J/kg
- Mixed-layer CIN
- -165 J/kg
- Mixed-layer LCL
- 862 m above ground
- 0-6 km bulk shear
- 42 kt
- 0-1 km storm-relative helicity
- 144 m²/s²
- 0-3 km storm-relative helicity
- 158 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
The text
As transmitted, in the capitals the NWS used until 2016.
000
TTAA00 KOKC 152330
SVROKC
OKC109-160015-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE OKLAHOMA CITY OK
630 PM CDT TUE SEP 15 1987
THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING
EFFECTIVE UNTIL 715 PM CDT FOR PEOPLE IN THE FOLLOWING COUNTY...
IN CENTRAL OKLAHOMA
...OKLAHOMA
AT 630 PM DIME TO QUARTER SIZE HAIL WAS REPORTED NEAR MUSTANG ROAD
AND I 40. THIS STORM HAS THE POTENTIAL TO PRODUCE WINDS OF UP TO 70
MPH AS IT MOVES INTO THE OKLAHOMA CITY METRO AREA. HEAVY RAINS MAY
ALSO RESULT IN LOCAL DRAINAGE FLOODING.
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.The office that day
Everything else NWS Norman, OK issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 14, 8:11 PM CDT | Severe Thunderstorm Warning | OUN | Hughes | 34 min |
| Sep 14, 8:58 PM CDT | Flash Flood Warning | OUN | Love, Marshall | 3 hr |
| Sep 15, 4:43 PM CDT | Severe Thunderstorm Warning | OUN | Canadian | 47 min |
| Sep 15, 4:49 PM CDT | Severe Thunderstorm Warning | OUN | Atoka, Pushmataha | 56 min |
| Sep 15, 5:04 PM CDT | Severe Thunderstorm Warning | OUN | Kingfisher, Logan, Oklahoma | 56 min |
| Sep 15, 5:24 PM CDT | Tornado Warning | OUN | Logan | 36 min |
| Sep 15, 5:32 PM CDT | Severe Thunderstorm Warning | OUN | Canadian | 28 min |
| Sep 15, 5:37 PM CDT | Tornado Warning | OUN | Oklahoma | 23 min |
| Sep 15, 5:45 PM CDT | Severe Thunderstorm Warning | OUN | Lincoln | 45 min |
| Sep 15, 5:55 PM CDT | Severe Thunderstorm Warning | OUN | Canadian, Grady | 50 min |
| Sep 15, 5:55 PM CDT | Tornado Warning | OUN | Lincoln | 50 min |
| Sep 15, 6:26 PM CDT | Tornado Warning | OUN | Payne | 49 min |
| Sep 15, 6:48 PM CDT | Severe Thunderstorm Warning | OUN | McClain, Pottawatomie | 57 min |
| Sep 15, 6:48 PM CDT | Severe Thunderstorm Warning | OUN | Garvin | 57 min |
| Sep 15, 6:58 PM CDT | Severe Thunderstorm Warning | OUN | Canadian, Grady | 32 min |
Nearby
Severe Thunderstorm Warnings in Oklahoma, 1987Every 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.