Alert archive / Oklahoma / Flash Flood Warnings in 1990
Flash Flood Warning 51, NWS Norman, OK
NWS Norman, OK issued this flash flood warning at Sep 21, 1990, 12:19 AM CDT for 4 counties in Oklahoma. It was in force for 3 hr.
The area
The counties it named.
The facts
- Issued
- Sep 21, 1990, 12:19 AM CDT (05:19 UTC)
- Expired
- Sep 21, 1990, 3:15 AM CDT
- In force
- 3 hr
- Issued by
- NWS Norman, OK
- Area
- Whole counties
Counties Canadian County, OK, Cleveland County, OK, Lincoln County, OK, Oklahoma County, OK
The radar
The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.
The nearest sounding before it
Norman, OK (KOUN), launched 00:00Z, 5.3 hours before the alert went out and 31 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
- 308 J/kg
- Mixed-layer CIN
- -26 J/kg
- Mixed-layer LCL
- 851 m above ground
- 0-6 km bulk shear
- 15 kt
- 0-1 km storm-relative helicity
- 58 m²/s²
- 0-3 km storm-relative helicity
- 101 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.
What forecasters said that day
The local office's own words before this flash flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
In the hours before
Special weather statement, Sep 20, 11:46 PM CDT, 33 minutes before
OKZ0-011-015-016-210500- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE OKLAHOMA CITY OK 1130 PM CDT THU SEP 20 1990 ...THUNDERSTORMS WITH VERY HEAVY RAIN AND GUSTY WINDS ARE MOVING THROUGH CENTRAL OKLAHOMA... AT 1130 PM AN AREA OF THUNDERSTORMS WITH VERY HEAVY RAIN AND GUSTY WINDS EXTENDED FROM EASTERN CANADIAN AND NORTHEASTERN GRADY COUNTIES ACROSS MOST OF OKLAHOMA COUNTY AND NORTHERN PORTIONS OF CLEVELAND AND MCCLAIN COUNTIES. HEAVY RAINS HAVE BEEN REPORTED DURING THE PAST HOUR AT YUKON MOORE MUSTANG AND THE OKLAHOMA CITY AREA ALONG WITH STREET FLOODING. THE THUNDERSTORMS WILL CONTINUE TO MOVE NORTHEASTWARD AT 20 MPH AND WILL SPREAD INTO LINCOLN AND NORTHERN POTTAWATOMIE COUNTIES! DURING THE NEXT HOUR. MOTORISTS SHOULD BE VERY CAUTIOUS AND BE ALERT FOR POOR VISIBILITIES AND FLOODED STREETS WHILE DRIVING THROUGH THIS AREA DURING THE NEXT 1 TO 2 HOURS. BRIEF STRONG AND GUSTY WINDS MAY ALSO ACCOMPANY THESE STORMS.
The office that day
Everything else NWS Norman, OK issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 21, 12:19 AM CDT | Flash Flood Warning | OUN | Grady | 3 hr |
| Sep 21, 2:27 AM CDT | Flash Flood Warning | OUN | Coal, Pontotoc | 4 hr |
Nearby
Flash Flood Warnings in Oklahoma, 1990Every flash flood 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; the sounding from the Mesonet's radiosonde archive.