Alert archive / Louisiana / Flash Flood Warnings in 2021
Flash Flood Warning 10, NWS Shreveport, LA
NWS Shreveport, LA issued this flash flood warning at May 20, 2021, 9:32 PM CDT for 4 parishes in Louisiana. It was in force for 88 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, 9:32 PM CDT (02:32 UTC)
- Expired
- May 20, 2021, 11:00 PM CDT
- In force
- 88 min
- Issued by
- NWS Shreveport, LA
- Area
- Storm-based polygon
- Flood severity
- None
Counties De Soto Parish, LA, Natchitoches Parish, LA, Red River Parish, LA, Sabine Parish, LA
The radar
The Ft Polk radar (KPOE), 47 km from the middle of the area, began a volume at 02:33 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, 10:12 PM CDT | FLASH FLOOD | 2 Nne Many, LA | HIGH WATER REPORTED ON PETTY ROAD NORTHEAST OF MANY, LOUISIANA. |
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 00:00Z, 2.5 hours before the alert went out and 118 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
- 198 J/kg
- Mixed-layer CIN
- -14 J/kg
- Mixed-layer LCL
- 844 m above ground
- 0-6 km bulk shear
- 38 kt
- 0-1 km storm-relative helicity
- 140 m²/s²
- 0-3 km storm-relative helicity
- 204 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.6
The text
As transmitted.
441
WGUS54 KSHV 210232
FFWSHV
LAC031-069-081-085-210400-
/O.NEW.KSHV.FF.W.0010.210521T0232Z-210521T0400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Shreveport LA
932 PM CDT Thu May 20 2021
The National Weather Service in Shreveport has issued a
* Flash Flood Warning for...
Southeastern De Soto Parish in northwestern Louisiana...
Southwestern Natchitoches Parish in northwestern Louisiana...
Red River Parish in northwestern Louisiana...
Eastern Sabine Parish in northwestern Louisiana...
* Until 1100 PM CDT.
* At 932 PM CDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 1 and 3 inches of rain
have fallen. Flash flooding is ongoing or expected to begin
shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Doppler radar.
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...
Natchitoches, Many, Coushatta, Allen, Pleasant Hill, Florien,
Provencal, Natchez, Martin, Hall Summit, Fisher, Edgefield,
Robeline, Powhatan, Marthaville, Hagewood, Ajax, Lake End, Belmont
and Hanna.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be especially cautious at night when it is harder to recognize the
dangers of flooding.
&&
LAT...LON 3222 9370 3222 9328 3139 9289 3139 9291
3137 9291 3137 9295 3135 9295 3135 9298
3136 9299 3136 9303 3136 9339 3128 9344
3128 9348
FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL...1-2 INCHES IN 1 HOUR AND 30 MINUTES
$$
13Nearby
Flash Flood Warnings in Louisiana, 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.