Alert archive / Oklahoma / Flash Flood Warnings in 2021
Flash Flood Warning 8, NWS Shreveport, LA
NWS Shreveport, LA issued this flash flood warning at May 20, 2021, 6:44 PM CDT for McCurtain County, Oklahoma. It was in force for 61 min. 1 report came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- May 20, 2021, 6:44 PM CDT (23:44 UTC)
- Expired
- May 20, 2021, 7:45 PM CDT
- In force
- 61 min
- Issued by
- NWS Shreveport, LA
- Area
- Storm-based polygon
- Flood severity
- None
County McCurtain County, OK
The radar
The Western Arkansas radar (KSRX), 133 km from the middle of the area, began a volume at 23:47 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| May 20, 7:35 PM CDT | FLASH FLOOD | Eagletown, OK | WATER OVER SEVERAL ROADS IN AND OUT OF EAGLETOWN, OKLAHOMA. REPORT FROM GAME WARDEN. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Shreveport, LA (KSHV), launched 12:00Z, 11.7 hours before the alert went out and 206 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
- 4 J/kg
- Mixed-layer CIN
- -179 J/kg
- Mixed-layer LCL
- 739 m above ground
- 0-6 km bulk shear
- 20 kt
- 0-1 km storm-relative helicity
- 182 m²/s²
- 0-3 km storm-relative helicity
- 210 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
308
WGUS54 KSHV 202344
FFWSHV
OKC089-210045-
/O.NEW.KSHV.FF.W.0008.210520T2344Z-210521T0045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Shreveport LA
644 PM CDT Thu May 20 2021
The National Weather Service in Shreveport has issued a
* Flash Flood Warning for...
Eastern McCurtain County in southeastern Oklahoma...
* Until 745 PM CDT.
* At 644 PM CDT, Storm Spotters reported thunderstorms producing
heavy rain across the warned area. Between 1 and 2 inches of rain
have fallen. Flash flooding is ongoing or expected to begin
shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Storm Spotter.
IMPACT...Flooding of small creeks and streams, urban areas,
highways, streets and underpasses as well as other
drainage and low lying areas.
* Some locations that will experience flash flooding include...
Idabel, Broken Bow, Haworth, Hochatown, Eagletown, Oak Hill, Holly
Creek, Goodwater, Cerrogordo, Sherwood, Mount Herman, Shinewell,
Bokhoma, Moon, Bethel, America, Plunketville, Tom and Battiest.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Excessive runoff from heavy rainfall will cause flooding of small
creeks and streams, country roads, farmland, and other low lying
spots.
In hilly terrain there are hundreds of low water crossings which are
potentially dangerous in heavy rain. Do not attempt to cross flooded
roads. Find an alternate route.
&&
LAT...LON 3440 9495 3379 9483 3365 9450 3443 9448
FLASH FLOOD...OBSERVED
EXPECTED RAINFALL...1-2.25 INCHES IN 1 HOUR
$$
13The office that day
Everything else NWS Shreveport, LA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 19, 7:59 PM CDT | River Flood Warning | SHV | McCurtain | 61 hr |
Nearby
Flash Flood Warnings in Oklahoma, 2021Every flash flood warning in 2021
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.