Alert archive / Oklahoma / Severe Thunderstorm Warnings in 1987
Severe Thunderstorm Warning 21, NWS Norman, OK
NWS Norman, OK issued this severe thunderstorm warning at Feb 14, 1987, 9:30 PM CST for Garvin County, Oklahoma. It was in force for 50 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
- Feb 14, 1987, 9:30 PM CST (03:30 UTC)
- Expired
- Feb 14, 1987, 10:20 PM CST
- In force
- 50 min
- Issued by
- NWS Norman, OK
- Area
- Whole counties
County Garvin 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 |
|---|---|---|---|
| Feb 14, 9:40 PM CST | Thunderstorm Wind 0 | Garvin, 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, 3.5 hours before the alert went out and 82 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
- 250 J/kg
- Mixed-layer CIN
- -57 J/kg
- Mixed-layer LCL
- 928 m above ground
- 0-6 km bulk shear
- 18 kt
- 0-1 km storm-relative helicity
- 52 m²/s²
- 0-3 km storm-relative helicity
- 73 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 0.5
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KOKC 150335 SVROKC OKC049-150420- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING...CORRECTION NATIONAL WEATHER SERVICE OKLAHOMA CITY OK 930 PM CST SAT FEB 14 1987 THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING FOR PERSONS IN THE FOLLOWING COUNTIES IN SOUTHERN OKLAHOMA EFFECTIVE UNTIL 1020PM CST... GARVIN. AT 930 PM CST A SEVERE THUNDERSTORM WAS LOCATED 5 MILES SOUTHWEST OF PAOLI MOVING NORTHEAST AT 25 MPH. PERSONS IN THE PATH OF THIS STORM SHOULD BE PREPARED FOR FOR BRIEF HEAVY RAIN...HAIL UP TO 1 INCH ..AND GUSTY WINDS.
The office that day
Everything else NWS Norman, OK issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Feb 14, 6:25 PM CST | Severe Thunderstorm Warning | OUN | Cotton, Jefferson | 45 min |
| Feb 14, 6:30 PM CST | Severe Thunderstorm Warning | OUN | Caddo, Comanche | 45 min |
| Feb 14, 6:40 PM CST | Severe Thunderstorm Warning | OUN | Blaine | 45 min |
| Feb 14, 7:05 PM CST | Severe Thunderstorm Warning | OUN | Jefferson, Stephens | 45 min |
| Feb 14, 7:05 PM CST | Severe Thunderstorm Warning | OUN | Blaine, Caddo, Canadian, Grady | 45 min |
| Feb 14, 7:05 PM CST | Severe Thunderstorm Warning | OUN | Kingfisher | 45 min |
| Feb 14, 7:35 PM CST | Severe Thunderstorm Warning | OUN | Carter, Garvin, Murray | 45 min |
| Feb 14, 7:45 PM CST | Severe Thunderstorm Warning | OUN | Canadian, Kingfisher | 50 min |
| Feb 14, 7:45 PM CST | Severe Thunderstorm Warning | OUN | Grady | 50 min |
| Feb 14, 7:48 PM CST | Severe Thunderstorm Warning | OUN | Jefferson, Stephens | 52 min |
| Feb 14, 7:55 PM CST | Severe Thunderstorm Warning | OUN | Cotton | 50 min |
| Feb 14, 8:05 PM CST | Severe Thunderstorm Warning | OUN | Cleveland, McClain, Oklahoma | 55 min |
| Feb 14, 8:12 PM CST | Severe Thunderstorm Warning | OUN | Comanche | 48 min |
| Feb 14, 8:13 PM CST | Tornado Warning | OUN | Garvin | 32 min |
| Feb 14, 8:25 PM CST | Severe Thunderstorm Warning | OUN | Caddo | 50 min |
| Feb 14, 8:45 PM CST | Severe Thunderstorm Warning | OUN | Garvin | 45 min |
| Feb 14, 9:00 PM CST | Severe Thunderstorm Warning | OUN | Cleveland, McClain, Oklahoma, Pottawatomie | 45 min |
| Feb 14, 9:15 PM CST | Severe Thunderstorm Warning | OUN | Logan | 45 min |
| Feb 14, 9:35 PM CST | Severe Thunderstorm Warning | OUN | Caddo, Grady | 55 min |
| Feb 14, 9:45 PM CST | Severe Thunderstorm Warning | OUN | McClain, Pottawatomie | 60 min |
| Feb 14, 9:45 PM CST | Severe Thunderstorm Warning | OUN | Seminole | 60 min |
| Feb 14, 10:05 PM CST | Severe Thunderstorm Warning | OUN | Lincoln, Logan, Payne | 40 min |
| Feb 14, 10:20 PM CST | Severe Thunderstorm Warning | OUN | Bryan, Marshall | 55 min |
| Feb 14, 11:05 PM CST | Severe Thunderstorm Warning | OUN | Choctaw | 40 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.