Alert archive / Oklahoma / Tornado Warnings in 1987
Tornado Warning 10, NWS Norman, OK
NWS Norman, OK issued this tornado warning at Jul 17, 1987, 3:57 PM CDT for Comanche County, Oklahoma. It was in force for 33 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
- Jul 17, 1987, 3:57 PM CDT (20:57 UTC)
- Expired
- Jul 17, 1987, 4:30 PM CDT
- In force
- 33 min
- Issued by
- NWS Norman, OK
- Area
- Whole counties
County Comanche 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 17, 4:08 PM CDT | Thunderstorm Wind 61 | Comanche, OK | |
| Jul 17, 4:27 PM CDT | Thunderstorm Wind 0 | Comanche, 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
Fort Sill, OK (KFSI), launched 12:00Z, 9.0 hours before the alert went out and 7 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
- 955 J/kg
- Mixed-layer CIN
- -8 J/kg
- Mixed-layer LCL
- 574 m above ground
- 0-6 km bulk shear
- 18 kt
- 0-1 km storm-relative helicity
- 281 m²/s²
- 0-3 km storm-relative helicity
- 259 m²/s²
- Significant tornado parameter
- 0.7
- Supercell composite
- 4.8
The text
As transmitted, in the capitals the NWS used until 2016.
000
TTAA00 KOKC 172104 COR
TOROKC
OKC031-172130-
BULLETIN - EBS ACTIVATION REQUESTED
TORNADO WARNING...CORRECTED FOR GARBLING OF TORNADO LOCATION
NATIONAL WEATHER SERVICE OKLAHOMA CITY OK
357 PM CDT FRI JUL 17 1987
THE NATIONAL WEATHER SERVICE HAS ISSUED A TORNADO WARNING
EFFECTIVE UNTIL 430 PM CDT FOR PEOPLE IN THE FOLLOWING COUNTY...
IN SOUTHWEST OKLAHOMA
...WESTERN COMANCHE
AT 357 PM AN INTENSE THUNDERSTORM WAS LOCATED 6 MILES NORTHWEST OF
CACHE MOVING TO THE EAST AT 20 MILES PER HOUR. THIS STORM PRODUCED A
TORNADO AROUND 330 PM EAST OF ALTUS...AND THE STORM APPEARS TO BE
STENGTHENING ONCE AGAIN. PERSONS IN CACHE SHOULD TAKE SHELTER AS THE
STORM PASSES.
IF YOU ARE IN THE PATH OF A TORNADO...THE SAFEST PLACE IS A
BASEMENT. GET UNDER A WORKBENCH OR PIECE OF STURDY FURNITURE.
IF NO BASEMENT IS AVAILABLE...SEEK SHELTER IN AN INTERIOR ROOM
SUCH AS A CLOSET ON THE LOWEST FLOOR. USE BLANKETS...PILLOWS...
OR CUSHIONS TO COVER YOUR BODY. AVOID WINDOWS.The office that day
Everything else NWS Norman, OK issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 17, 3:20 PM CDT | Severe Thunderstorm Warning | OUN | Comanche, Kiowa | 40 min |
| Jul 17, 4:34 PM CDT | Tornado Warning | OUN | Comanche, Kiowa, Tillman | 31 min |
| Jul 17, 4:54 PM CDT | Severe Thunderstorm Warning | OUN | Caddo, Grady | 51 min |
| Jul 17, 5:13 PM CDT | Severe Thunderstorm Warning | OUN | Caddo, Comanche, Grady | 47 min |
| Jul 17, 5:56 PM CDT | Severe Thunderstorm Warning | OUN | Garvin, Grady, McClain | 49 min |
| Jul 17, 6:15 PM CDT | Severe Thunderstorm Warning | OUN | Cleveland, McClain | 60 min |
| Jul 17, 6:37 PM CDT | Severe Thunderstorm Warning | OUN | Pottawatomie | 53 min |
| Jul 17, 6:43 PM CDT | Severe Thunderstorm Warning | OUN | Garvin, Grady | 32 min |
Nearby
Tornado Warnings in Oklahoma, 1987Every tornado warning in 1987Tornadoes 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.