Alert archive / Louisiana / Flash Flood Warnings in 2021
Flash Flood Warning 19, NWS Jackson, MS
NWS Jackson, MS issued this flash flood warning at May 4, 2021, 12:37 PM CDT for Morehouse Parish, West Carroll Parish, Louisiana; Ashley County, Chicot County, Arkansas. It was in force for 3 hr. 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 4, 2021, 12:37 PM CDT (17:37 UTC)
- Expired
- May 4, 2021, 3:30 PM CDT
- In force
- 3 hr
- Issued by
- NWS Jackson, MS
- Area
- Storm-based polygon
- Flood severity
- None
Counties Ashley County, AR, Chicot County, AR, Morehouse Parish, LA, West Carroll Parish, LA
The radar
The Jackson/Brandon,MS radar (KDGX), 175 km from the middle of the area, began a volume at 17:41 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 4, 1:35 PM CDT | FLASH FLOOD | Dermott, AR | FLOODING DESCRIBED AS MAJOR WITH TWO FEET OF WATER COVERING HIGHWAYS AND BARRICADES GOING UP - REPORTED BY DERMOTT EM. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Jackson, MS (KJAN), launched 12:00Z, 5.6 hours before the alert went out and 165 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
- 2428 J/kg
- Mixed-layer CIN
- -6 J/kg
- Mixed-layer LCL
- 646 m above ground
- 0-6 km bulk shear
- 35 kt
- 0-1 km storm-relative helicity
- 170 m²/s²
- 0-3 km storm-relative helicity
- 235 m²/s²
- Significant tornado parameter
- 2.8
- Supercell composite
- 13.2
The text
As transmitted.
275
WGUS54 KJAN 041737
FFWJAN
ARC003-017-LAC067-123-042030-
/O.NEW.KJAN.FF.W.0019.210504T1737Z-210504T2030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Jackson MS
1237 PM CDT Tue May 4 2021
The National Weather Service in Jackson has issued a
* Flash Flood Warning for...
Ashley County in southeastern Arkansas...
Chicot County in southeastern Arkansas...
Morehouse Parish in northeastern Louisiana...
Northern West Carroll Parish in northeastern Louisiana...
* Until 330 PM CDT.
* At 1236 PM CDT, Doppler radar indicated 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...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...
Bastrop, Crossett, Hamburg, Lake Village, Dermott, Eudora, Wilmot,
North Crossett, West Crossett, Oak Grove, Portland, Montrose,
Parkdale, Fountain Hill, Jones, Berlin, Snyder, Galion, Beekman
and Goodwill.
Additional rainfall amounts of 2 to 3 inches are possible in the
warned area.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3319 9214 3338 9196 3340 9199 3339 9146
3356 9143 3345 9112 3344 9112 3340 9121
3338 9117 3345 9106 3335 9114 3329 9106
3314 9109 3311 9120 3304 9112 3252 9186
3257 9193 3265 9191 3271 9204 3269 9205
FLASH FLOOD...RADAR INDICATED
$$
DC1 follow-up statement
510
WGUS74 KJAN 041859
FFSJAN
Flash Flood Statement
National Weather Service Jackson MS
159 PM CDT Tue May 4 2021
ARC003-017-LAC067-123-042030-
/O.CON.KJAN.FF.W.0019.000000T0000Z-210504T2030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Ashley AR-Chicot AR-Morehouse LA-West Carroll LA-
159 PM CDT Tue May 4 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 330 PM CDT THIS
AFTERNOON FOR ASHLEY AND CHICOT COUNTIES AND MOREHOUSE AND NORTHERN
WEST CARROLL PARISHES...
At 157 PM CDT, Doppler radar indicated moderate to heavy rain
continuing to move across the warned area. Between 2 and 3 inches of
rain have fallen. Flash flooding is already occurring. Additional
rainfall of up to an inch is expected for the next one to two hours.
HAZARD...Life threatening flash flooding. Thunderstorms producing
flash flooding.
SOURCE...Doppler radar.
IMPACT...Life threatening flash flooding of creeks and streams,
urban areas, highways, streets and underpasses.
Some locations that will experience flash flooding include...
Bastrop, Crossett, Hamburg, Lake Village, Dermott, Eudora, Wilmot,
North Crossett, West Crossett, Oak Grove, Portland, Montrose,
Parkdale, Fountain Hill, Jones, Berlin, Snyder, Galion, Beekman
and Goodwill.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3319 9214 3338 9196 3340 9199 3339 9146
3356 9143 3345 9112 3344 9112 3340 9121
3338 9117 3345 9106 3335 9114 3329 9106
3314 9109 3311 9120 3304 9112 3252 9186
3257 9193 3265 9191 3271 9204 3269 9205
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
EXPECTED RAINFALL...0.5-1 INCH IN 2 HOURS
$$
ECThe office that day
Everything else NWS Jackson, MS issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 4, 11:57 AM CDT | Severe Thunderstorm Warning | JAN | Morehouse | 78 min |
| May 4, 12:30 PM CDT | Severe Thunderstorm Warning | JAN | East Carroll, West Carroll | 75 min |
| May 4, 12:57 PM CDT | Severe Thunderstorm Warning | JAN | East Carroll, Franklin, Madison, Richland, West Carroll | 76 min |
| May 4, 1:15 PM CDT | Severe Thunderstorm Warning | JAN | Catahoula, Concordia, Franklin, Tensas | 75 min |
| May 4, 1:37 PM CDT | Severe Thunderstorm Warning | JAN | East Carroll, Madison | 53 min |
| May 4, 1:57 PM CDT | Severe Thunderstorm Warning | JAN | Tensas | 78 min |
| May 4, 3:51 PM CDT | Areal Flood Warning | JAN | Morehouse, West Carroll | 6 hr |
| May 4, 12:18 PM CDT | Severe Thunderstorm Warning | JAN | Chicot | 72 min |
Nearby
Flash Flood Warnings in Louisiana, 2021Flash Flood Warnings in Arkansas, 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.