Alert archive / Oklahoma / Flash Flood Warnings in 1990
Flash Flood Warning 29, NWS Tulsa, OK
NWS Tulsa, OK issued this flash flood warning at May 21, 1990, 12:28 AM CDT for LeFlore County, Oklahoma. It was in force for 3 hr.
The area
The counties it named.
The facts
- Issued
- May 21, 1990, 12:28 AM CDT (05:28 UTC)
- Expired
- May 21, 1990, 3:30 AM CDT
- In force
- 3 hr
- Issued by
- NWS Tulsa, OK
- Area
- Whole counties
County LeFlore 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
Springfield, MO (KUMN), launched 00:00Z, 5.5 hours before the alert went out and 237 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
- 2299 J/kg
- Mixed-layer CIN
- -15 J/kg
- Mixed-layer LCL
- 1348 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- 37 m²/s²
- 0-3 km storm-relative helicity
- 196 m²/s²
- Significant tornado parameter
- 0.7
- Supercell composite
- 7.8
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KFSM 210530 FFWFSM OKC079-210830- BULLETIN - EBS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE FORT SMITH AR 1228 AM CDT MON MAY 21 1990 THE NATIONAL WEATHER SERVICE IN FORT SMITH HAS ISSUED A FLASH FLOOD WARNING EFFECTIVE UNTIL 330 AM CDT FOR PEOPLE IN THE FOLLOWING LOCATIONS... IN SOUTHEAST OKLAHOMA ...SOUTHERN LE FLORE COUNTY A LINE OF THUNDERSTORMS EXTENDS ACROSS EXTREME SOUTHERN LEFLORE COUNTY. THESE THUNDERSTORMS CONTINUE TO RAIN OVER THE SAME AREAS. LOCALLY HEAVY RAINFALL IS LIKELY. DRIVERS SHOULD BE PARTICULARLY ALERT. 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. DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS SQAFELY. VEHICLES CAUGHT IN RISING WATER SHOULD BE ABANDONED QUICKLY. MOVE TO HIGHER GROUND.
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
Local storm report, May 20, 10:14 PM CDT, 2 hours 14 minutes before
STORM REPORT
NATIONAL WEATHER SERVICE TULSA, OK
1011 PM CDT SUN MAY 20 1990
TIME/CDT COUNTY EVENT
9 35 PM OTTAWA DIME TO NICKEL SIZE HAIL AT QUAPAW.
9 50 PM OTTAWA QUARTER SqIZE HAIL AT TURNPIKE TOLL BOOTH
ON OKLAHOMA-MISSOURI LINE. REPORTED THE HAIL
FALLING IN BOTH STATES.The office that day
Everything else NWS Tulsa, OK issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 20, 9:29 PM CDT | Severe Thunderstorm Warning | TSA | Ottawa | 46 min |
| May 20, 11:26 PM CDT | Severe Thunderstorm Warning | TSA | Delaware | 34 min |
| May 20, 11:32 PM CDT | Severe Thunderstorm Warning | TSA | LeFlore | 58 min |
| May 21, 12:39 AM CDT | Severe Thunderstorm Warning | TSA | LeFlore | 66 min |
| May 21, 2:27 AM CDT | Severe Thunderstorm Warning | TSA | Cherokee, Muskogee | 48 min |
| May 21, 2:32 AM CDT | Severe Thunderstorm Warning | TSA | Sequoyah | 58 min |
| May 21, 2:36 AM CDT | Severe Thunderstorm Warning | TSA | Adair | 39 min |
| May 21, 3:27 AM CDT | Severe Thunderstorm Warning | TSA | LeFlore, Sequoyah | 63 min |
| May 21, 4:28 AM CDT | Severe Thunderstorm Warning | TSA | LeFlore | 62 min |
| May 21, 5:27 AM CDT | Severe Thunderstorm Warning | TSA | LeFlore | 63 min |
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.