Alert archive / Alabama / Flash Flood Warnings in 2021
Flash Flood Warning 17, NWS Huntsville, AL
NWS Huntsville, AL issued this flash flood warning at Mar 31, 2021, 8:49 AM CDT for Madison County, Marshall County, Morgan County, Alabama. It was in force for 3 hr. 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, 8:49 AM CDT (13:49 UTC)
- Expired
- Mar 31, 2021, 11:45 AM CDT
- In force
- 3 hr
- Issued by
- NWS Huntsville, AL
- Area
- Storm-based polygon
- Flood severity
- None
Counties Madison County, AL, Marshall County, AL, Morgan County, AL
The radar
The Northeast Alabama radar (KHTX), 62 km from the middle of the area, began a volume at 13:52 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, 1.8 hours before the alert went out and 148 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.
448
WGUS54 KHUN 311349
FFWHUN
ALC089-095-103-311645-
/O.NEW.KHUN.FF.W.0017.210331T1349Z-210331T1645Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Huntsville AL
849 AM CDT Wed Mar 31 2021
The National Weather Service in Huntsville has issued a
* Flash Flood Warning for...
Southeastern Madison County in north central Alabama...
Southeastern Morgan County in north central Alabama...
Northwestern Marshall County in northeastern Alabama...
* Until 1145 AM CDT.
* At 849 AM CDT, Doppler radar and automated rain gauges indicated
thunderstorms producing heavy rain across the warned area. Between
2 and 4 inches of rain have fallen. Flash flooding is ongoing or
expected to begin shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Doppler radar and automated gauges.
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...
Southern Huntsville, Arab, Owens Cross Roads, Grant, Morgan City,
Eva, Union Grove, Eddy, Laceys Spring, Ryan Crossroads, Hulaco,
Valhermoso Springs, Florette and Columbus City.
Additional rainfall amounts up to 1 inch are possible in the warned
area.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A Flash Flood Warning means that flooding is imminent or occurring.
If you are in the warned area move to higher ground immediately.
Residents living along streams and creeks should take immediate
precautions to protect life and property.
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3431 8682 3447 8678 3456 8654 3468 8636
3463 8636 3460 8633 3460 8630 3447 8619
3429 8657
FLASH FLOOD...RADAR AND GAUGE INDICATED
$$
McCoy1 follow-up statement
053
WGUS74 KHUN 311637
FFSHUN
Flash Flood Statement
National Weather Service Huntsville AL
1137 AM CDT Wed Mar 31 2021
ALC089-095-103-311647-
/O.EXP.KHUN.FF.W.0017.000000T0000Z-210331T1645Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Madison AL-Marshall AL-Morgan AL-
1137 AM CDT Wed Mar 31 2021
...FLASH FLOOD WARNING WILL EXPIRE AT 1145 AM CDT THIS MORNING FOR
SOUTHEASTERN MADISON, SOUTHEASTERN MORGAN AND NORTHWESTERN MARSHALL
COUNTIES...
This flash flood warning has been replaced with an Areal Flood
Warning. Even though the heavy rain has ended, flooding will
continue to cause problems for the next several hours. Please
continue to heed remaining road closures.
LAT...LON 3431 8682 3447 8678 3456 8654 3468 8636
3463 8636 3460 8633 3460 8630 3447 8619
3429 8657
$$
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, 9:41 AM CDT | Flash Flood Warning | HUN | DeKalb, Jackson, Marshall | 119 min |
| 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.