Alert archive / Mississippi / Flash Flood Warnings in 2021
Flash Flood Warning 99, NWS Jackson, MS
NWS Jackson, MS issued this flash flood warning at Sep 18, 2021, 4:35 PM CDT for Forrest County, Lamar County, Mississippi. It was in force for 42 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Sep 18, 2021, 4:35 PM CDT (21:35 UTC)
- Expired
- Sep 18, 2021, 5:17 PM CDT
- In force
- 42 min
- Issued by
- NWS Jackson, MS
- Area
- Storm-based polygon
- Flood severity
- None
Counties Forrest County, MS, Lamar County, MS
The radar
The Jackson/Brandon,MS radar (KDGX), 121 km from the middle of the area, began a volume at 21:38 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.
The nearest sounding before it
Slidell Radar S, LA (KSIL), launched 12:00Z, 9.6 hours before the alert went out and 123 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
- 1642 J/kg
- Mixed-layer CIN
- -7 J/kg
- Mixed-layer LCL
- 550 m above ground
- 0-6 km bulk shear
- 4 kt
- 0-1 km storm-relative helicity
- -4 m²/s²
- 0-3 km storm-relative helicity
- 32 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
696
WGUS54 KJAN 182135
FFWJAN
MSC035-073-182300-
/O.NEW.KJAN.FF.W.0099.210918T2135Z-210918T2300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Jackson MS
435 PM CDT Sat Sep 18 2021
The National Weather Service in Jackson has issued a
* Flash Flood Warning for...
Northwestern Forrest County in southeastern Mississippi...
Northeastern Lamar County in southeastern Mississippi...
* Until 600 PM CDT.
* At 435 PM CDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 2 and 4 inches of rain
have fallen. Additional rainfall amounts up to 1 inch are possible
in the warned area. Flash flooding is ongoing or expected to begin
shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar.
IMPACT...Flash flooding of small creeks and streams, urban
areas, highways, streets and underpasses as well as
other poor drainage and low-lying areas.
* Some locations that will experience flash flooding include...
Hattiesburg, Petal, West Hattiesburg, Oak Grove and Rawls Springs.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3135 8945 3138 8945 3139 8941 3135 8925
3126 8924 3125 8933 3126 8945
FLASH FLOOD...RADAR INDICATED
$$
DL1 follow-up statement
088
WGUS74 KJAN 182217
FFSJAN
Flash Flood Statement
National Weather Service Jackson MS
517 PM CDT Sat Sep 18 2021
MSC035-073-182227-
/O.CAN.KJAN.FF.W.0099.000000T0000Z-210918T2300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Forrest MS-Lamar MS-
517 PM CDT Sat Sep 18 2021
...FLASH FLOOD WARNING IS CANCELLED FOR NORTHWESTERN FORREST AND
NORTHEASTERN LAMAR COUNTIES...
The heavy rain has ended. Flooding is no longer expected to pose a
threat.
LAT...LON 3135 8945 3138 8945 3139 8941 3135 8925
3126 8924 3125 8933 3126 8945
$$
DLThe office that day
Everything else NWS Jackson, MS issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 17, 7:30 PM CDT | Special Weather Statement | JAN | Clay | 60 min |
| Sep 17, 7:48 PM CDT | Special Weather Statement | JAN | Bolivar | 57 min |
| Sep 17, 9:27 PM CDT | Flash Flood Warning | JAN | Lowndes | 93 min |
| Sep 17, 10:05 PM CDT | Flash Flood Warning | JAN | Issaquena, Sharkey | 2 hr |
| Sep 18, 2:30 PM CDT | Special Weather Statement | JAN | Lowndes | 45 min |
| Sep 18, 3:41 PM CDT | Special Weather Statement | JAN | Forrest | 49 min |
| Sep 18, 4:49 PM CDT | Special Weather Statement | JAN | Winston | 41 min |
Nearby
Flash Flood Warnings in Mississippi, 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.