Alert archive / Oklahoma / Tornado Warnings in 1987
Tornado Warning 11, NWS Norman, OK
NWS Norman, OK issued this tornado warning at Jul 17, 1987, 4:34 PM CDT for Comanche County, Kiowa County, Tillman County, Oklahoma. It was in force for 31 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 17, 1987, 4:34 PM CDT (21:34 UTC)
- Expired
- Jul 17, 1987, 5:05 PM CDT
- In force
- 31 min
- Issued by
- NWS Norman, OK
- Area
- Whole counties
Counties Comanche County, OK, Kiowa County, OK, Tillman 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, 4:48 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, 9.6 hours before the alert went out and 36 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 172129
TOROKC
OKC031-075-141-172215-
BULLETIN - EBS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE OKLAHOMA CITY OK
434 PM CDT FRI JUL 17 1987
THE NATIONAL WEATHER SERVICE HAS ISSUED A TORNADO WARNING
EFFECTIVE UNTIL 515 PM CDT FOR PEOPLE IN THE FOLLOWING COUNTY...
IN SOUTHWEST OKLAHOMA
...COMANCHE...NORTHERN TILLMAN...SOUTHERN KIOWA
AT 430 PM A SEVERE THUNDERSTORM CONTINUED OVER CENTRAL COMANCHE
COUNTY WITH A TORNADO REPORTED 8 MILES NORTH NORTHEAST OF CACHE
AROUND 420 PM. ANOTHER SEVERE THUNDERSTORM HAS DEVELOPED FURTHER WEST
IN THE SNYDER AREA. A TORNADO ALSO WAS REPORTED WITH THIS STORM 3
MILES SOUTH OF SNYDER AROUND 430 PM. THE STORMS ARE MOVING EAST AT 20
MPH.
IF YOU ARE CAUGHT OUTSIDE...SEEK SHELTER IN A NEARBY REINFORCED
BUILDING. AS A LAST RESORT...SEEK SHELTER IN A CULVERT...DITCH
OR LOW SPOT AND COVER YOUR HEAD WITH YOUR HANDS.What forecasters said that day
The local office's own words before this tornado 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, Jul 17, 4:12 PM CDT, 22 minutes before
STORM REPORT NATIONAL WEATHER SERVICE OKLAHOMA CITY OK 411 PM CDT FRI JUL 17 1987 TIME COUNTY REPORT 408 PM COMANCHE WINDS GREATER THAN 70 MPH IN INDIAHOMA.
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, 3:57 PM CDT | Tornado Warning | OUN | Comanche | 33 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.