Alert archive / Oklahoma / Severe Thunderstorm Warnings in 1990
Severe Thunderstorm Warning 331, NWS Norman, OK
NWS Norman, OK issued this severe thunderstorm warning at Jun 21, 1990, 2:13 AM CDT for Canadian County, Oklahoma. It was in force for 62 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
- Jun 21, 1990, 2:13 AM CDT (07:13 UTC)
- Expired
- Jun 21, 1990, 3:15 AM CDT
- In force
- 62 min
- Issued by
- NWS Norman, OK
- Area
- Whole counties
County Canadian 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 |
|---|---|---|---|
| Jun 21, 3:00 AM CDT | Hail 0.88 | Canadian, 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
Norman, OK (KOUN), launched 00:00Z, 7.2 hours before the alert went out and 64 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
- 1826 J/kg
- Mixed-layer CIN
- -46 J/kg
- Mixed-layer LCL
- 1437 m above ground
- 0-6 km bulk shear
- 52 kt
- 0-1 km storm-relative helicity
- 50 m²/s²
- 0-3 km storm-relative helicity
- 277 m²/s²
- Significant tornado parameter
- 1.7
- Supercell composite
- 12.1
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KOKC 210714 RRA SVROKC OKC017-210815- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE OKLAHOMA CITY OK 213 AM CDT THU JUN 21 1990 THE NATIONAL WEATHER SERVICE IN OKLAHOMA CITY HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 315 AM CDT FOR THE FOLLOWING OKLAHOMA LOCATIONS... IN CENTRAL OKLAHOMA ...CANADIAN COUNTY AT 213 AM RADAR INDICATED A SEVERE THUNDERSTORM 10 MILES WEST-NORTHWEST OF CALUMET MOVING EAST-SOUTHEAST AT 15 MPH. HAIL IN EXCESS OF ONE INCH IN DIAMETER AND STRONG WINDS ARE LIKELY WITH THIS STORM. SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 55 MPH...DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN. 1FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SO DON'T DRIVE INTO AREAS WHERE WATER COVERS THE ROAD.
The office that day
Everything else NWS Norman, OK issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 21, 1:48 AM CDT | Severe Thunderstorm Warning | OUN | Blaine | 42 min |
| Jun 21, 3:04 PM CDT | Severe Thunderstorm Warning | OUN | Kay | 41 min |
| Jun 21, 3:53 PM CDT | Severe Thunderstorm Warning | OUN | Noble | 52 min |
| Jun 21, 4:30 PM CDT | Severe Thunderstorm Warning | OUN | Woods | 45 min |
| Jun 21, 5:22 PM CDT | Severe Thunderstorm Warning | OUN | Alfalfa, Grant | 53 min |
| Jun 21, 5:45 PM CDT | Severe Thunderstorm Warning | OUN | Ellis, Roger Mills | 45 min |
| Jun 21, 6:12 PM CDT | Severe Thunderstorm Warning | OUN | Grant | 33 min |
| Jun 21, 6:33 PM CDT | Severe Thunderstorm Warning | OUN | Garfield | 42 min |
| Jun 21, 6:38 PM CDT | Severe Thunderstorm Warning | OUN | Blaine, Kingfisher | 52 min |
| Jun 21, 6:49 PM CDT | Severe Thunderstorm Warning | OUN | Beckham, Roger Mills | 41 min |
| Jun 21, 6:52 PM CDT | Severe Thunderstorm Warning | OUN | Kay | 53 min |
Nearby
Severe Thunderstorm Warnings in Oklahoma, 1990Every severe thunderstorm warning in 1990
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.