Alert archive / Alabama / Flash Flood Warnings in 2021
Flash Flood Warning 18, NWS Huntsville, AL
NWS Huntsville, AL issued this flash flood warning at Mar 31, 2021, 9:41 AM CDT for DeKalb County, Jackson County, Marshall County, Alabama. It was in force for 119 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
- Mar 31, 2021, 9:41 AM CDT (14:41 UTC)
- Expired
- Mar 31, 2021, 11:40 AM CDT
- In force
- 119 min
- Issued by
- NWS Huntsville, AL
- Area
- Storm-based polygon
- Flood severity
- None
Counties DeKalb County, AL, Jackson County, AL, Marshall County, AL
The radar
The Northeast Alabama radar (KHTX), 65 km from the middle of the area, began a volume at 14:41 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.
The nearest sounding before it
Birmingham, AL (KBMX), launched 12:00Z, 2.7 hours before the alert went out and 152 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
- 455 J/kg
- Mixed-layer CIN
- -3 J/kg
- Mixed-layer LCL
- 527 m above ground
- 0-6 km bulk shear
- 44 kt
- 0-1 km storm-relative helicity
- 273 m²/s²
- 0-3 km storm-relative helicity
- 283 m²/s²
- Significant tornado parameter
- 0.6
- Supercell composite
- 3.5
The text
As transmitted.
152
WGUS54 KHUN 311441
FFWHUN
ALC049-071-095-311745-
/O.NEW.KHUN.FF.W.0018.210331T1441Z-210331T1745Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Huntsville AL
941 AM CDT Wed Mar 31 2021
The National Weather Service in Huntsville has issued a
* Flash Flood Warning for...
DeKalb County in northeastern Alabama...
Southeastern Jackson County in northeastern Alabama...
Marshall County in northeastern Alabama...
* Until 1245 PM CDT.
* At 941 AM CDT, emergency management reported 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...Emergency management.
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...
Albertville, Scottsboro, Fort Payne, Boaz, Guntersville,
Rainsville, Henagar, Crossville, Sylvania, Fyffe, Powell,
Geraldine, Section, Ider, Pisgah, Douglas, Valley Head,
Hammondville, Mentone and Dutton.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3436 8647 3486 8558 3452 8551 3447 8558
3444 8558 3436 8563 3426 8577 3424 8584
3421 8584 3418 8619 3410 8630 3426 8645
FLASH FLOOD...OBSERVED
$$
McCoy1 follow-up statement
705
WGUS74 KHUN 311640
FFSHUN
Flash Flood Statement
National Weather Service Huntsville AL
1140 AM CDT Wed Mar 31 2021
ALC049-071-095-311650-
/O.CAN.KHUN.FF.W.0018.000000T0000Z-210331T1745Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
DeKalb AL-Jackson AL-Marshall AL-
1140 AM CDT Wed Mar 31 2021
...FLASH FLOOD WARNING IS CANCELLED FOR DEKALB, SOUTHEASTERN JACKSON
AND MARSHALL COUNTIES...
This flash flood warning has been replaced with an Areal Flood
Warning. Even though the heavy rain has ended, flooding will
continue to cause problems for the next several hours. Please
continue to heed remaining road closures.
LAT...LON 3436 8647 3486 8558 3452 8551 3447 8558
3444 8558 3436 8563 3426 8577 3424 8584
3421 8584 3418 8619 3410 8630 3426 8645
$$
McCoyThe office that day
Everything else NWS Huntsville, AL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 31, 3:38 AM CDT | Special Weather Statement | HUN | Marshall | 52 min |
| Mar 31, 3:56 AM CDT | Special Weather Statement | HUN | Morgan | 49 min |
| Mar 31, 4:59 AM CDT | Areal Flood Warning | HUN | Jackson | 3 hr |
| Mar 31, 6:21 AM CDT | Areal Flood Warning | HUN | Cullman | 3 hr |
| Mar 31, 7:21 AM CDT | Flash Flood Warning | HUN | Cullman | 6 hr |
| Mar 31, 7:30 AM CDT | Flash Flood Warning | HUN | Jackson, Marshall | 4 hr |
| Mar 31, 7:36 AM CDT | Special Weather Statement | HUN | Cullman | 39 min |
| Mar 31, 8:49 AM CDT | Flash Flood Warning | HUN | Madison, Marshall, Morgan | 3 hr |
| Mar 31, 11:35 AM CDT | Areal Flood Warning | HUN | DeKalb, Jackson, Madison, Marshall, Morgan | 6 hr |
| Mar 31, 1:06 PM CDT | Areal Flood Warning | HUN | Cullman | 5 hr |
| Mar 31, 1:42 PM CDT | River Flood Warning | HUN | Madison, Marshall, Morgan | 55 hr |
| Mar 31, 1:52 PM CDT | Freeze Watch | HUN | Colbert, Cullman, DeKalb, Franklin, Jackson, Lauderdale and 5 more | 13 hr |
| Mar 31, 1:52 PM CDT | Freeze Warning | HUN | Colbert, Cullman, DeKalb, Franklin, Jackson, Lauderdale and 5 more | 42 hr |
| Mar 31, 5:29 PM CDT | Areal Flood Warning | HUN | DeKalb | 3 hr |
| Mar 31, 6:18 PM CDT | Areal Flood Warning | HUN | Cullman | 18 hr |
Nearby
Flash Flood Warnings in Alabama, 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.