Alert archive / Oklahoma / Flash Flood Warnings in 1990
Flash Flood Warning 21, NWS Norman, OK
NWS Norman, OK issued this flash flood warning at Apr 26, 1990, 12:13 AM CDT for Hughes County, Oklahoma. It was in force for 4 hr.
The area
The counties it named.
The facts
- Issued
- Apr 26, 1990, 12:13 AM CDT (05:13 UTC)
- Expired
- Apr 26, 1990, 3:45 AM CDT
- In force
- 4 hr
- Issued by
- NWS Norman, OK
- Area
- Whole counties
County Hughes 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, 5.2 hours before the alert went out and 106 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
- 25 J/kg
- Mixed-layer CIN
- -264 J/kg
- Mixed-layer LCL
- 972 m above ground
- 0-6 km bulk shear
- 46 kt
- 0-1 km storm-relative helicity
- 181 m²/s²
- 0-3 km storm-relative helicity
- 203 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KOKC 260515 FFWOKC OKC019-049-063-069-085-095-099-260845- BULLETIN - EBS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE OKLAHOMA CITY OK 1213 AM CDT THU APR 26 1990 THE NATIONAL WEATHER SERVICE IN OKLAHOMA CITY HAS ISSUED A FLASH FLOOD WARNING EFFECTIVE UNTIL 345 AM CDT FOR THE FOLLOWING OKLAHOMA LOCATIONS... IN SOUTHEAST OKLAHOMA ...CARTER COUNTY...GARVIN COUNTY...HUGHES COUNTY...JOHNSTON COUNTY ...LOVE COUNTY...MARSHALL COUNTY...MURRAY COUNTY AT 1213 AM RADAR INDICATED A LINE OF STRONG THUNDERSTORMS PRODUCING TORRENTIAL RAINFALL FROM JUST EAST OF SEMINOLE...TO NEAR ADA... TO SPRINGER...TO MARIETTA. THE LINE OF STORMS WAS 20 MILES WIDE AND MOVING EAST AT 5 TO 10 MPH. INDIVIDUAL STORMS WITHIN THE LINE WERE TRACKING NORTHEAST AT 35 MPH. DANGEROUS FLASH FLOODING HAS BEEN REPORTED FROM THE STORMS WITH RAINFALL AMOUNTS AVERAGING 2 TO 4 INCHES WITH SOME LOCALLY HIGHER AMOUNTS POSSIBLE. BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE DANGERS OF FLOODS AND FLASH FLOODS. IF FLASH FLOODING IS OBSERVED...ACT QUICKLY. MOVE UP TO ESCAPE FLOOD WATERS. DO NOT STAY IN AREAS SUBJECT TO FLOODING WHEN WATER BEGINS RISING.
The office that day
Everything else NWS Norman, OK issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 25, 7:18 PM CDT | Severe Thunderstorm Warning | OUN | Comanche | 42 min |
| Apr 25, 7:41 PM CDT | Severe Thunderstorm Warning | OUN | Grady | 49 min |
| Apr 25, 7:56 PM CDT | Severe Thunderstorm Warning | OUN | Cleveland | 49 min |
| Apr 25, 8:19 PM CDT | Tornado Warning | OUN | Carter | 26 min |
| Apr 25, 8:29 PM CDT | Severe Thunderstorm Warning | OUN | Oklahoma | 46 min |
| Apr 25, 8:45 PM CDT | Tornado Warning | OUN | Carter | 45 min |
| Apr 25, 10:13 PM CDT | Flash Flood Warning | OUN | Garvin, Murray | 2 hr |
| Apr 25, 11:37 PM CDT | Flash Flood Warning | OUN | Pontotoc, Pottawatomie, Seminole | 4 hr |
| Apr 26, 12:13 AM CDT | Flash Flood Warning | OUN | Carter, Johnston, Marshall, Murray | 4 hr |
| Apr 26, 12:13 AM CDT | Flash Flood Warning | OUN | Love | 4 hr |
| Apr 26, 12:13 AM CDT | Flash Flood Warning | OUN | Garvin | 4 hr |
| Apr 26, 3:44 AM CDT | Flash Flood Warning | OUN | Carter, Murray, Pontotoc | 3 hr |
| Apr 26, 3:44 AM CDT | Flash Flood Warning | OUN | Love | 3 hr |
| Apr 26, 8:52 AM CDT | Flash Flood Warning | OUN | Carter, Jefferson, Love | 3 hr |
| Apr 26, 8:52 AM CDT | Flash Flood Warning | OUN | Garvin, Murray, Pontotoc | 3 hr |
| Apr 26, 8:52 AM CDT | Flash Flood Warning | OUN | Stephens | 3 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.