Alert archive / Alabama / Flash Flood Warnings in 2021
Flash Flood Warning 32, NWS Huntsville, AL
NWS Huntsville, AL issued this flash flood warning at Aug 19, 2021, 9:47 AM CDT for Cullman 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
- Aug 19, 2021, 9:47 AM CDT (14:47 UTC)
- Expired
- Aug 19, 2021, 1:06 PM CDT
- In force
- 3 hr
- Issued by
- NWS Huntsville, AL
- Area
- Storm-based polygon
- Flood severity
- None
County Cullman County, AL
The radar
The Northeast Alabama radar (KHTX), 95 km from the middle of the area, began a volume at 14:51 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, 2.8 hours before the alert went out and 116 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
- 2206 J/kg
- Mixed-layer CIN
- -4 J/kg
- Mixed-layer LCL
- 517 m above ground
- 0-6 km bulk shear
- 19 kt
- 0-1 km storm-relative helicity
- 29 m²/s²
- 0-3 km storm-relative helicity
- 54 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
598
WGUS54 KHUN 191447
FFWHUN
ALC043-191745-
/O.NEW.KHUN.FF.W.0032.210819T1447Z-210819T1745Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Huntsville AL
947 AM CDT Thu Aug 19 2021
The National Weather Service in Huntsville has issued a
* Flash Flood Warning for...
Northern Cullman County in north central Alabama...
* Until 1245 PM CDT.
* At 947 AM CDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 2 and 3 inches of rain
have fallen in northwest Cullman County. The expected rainfall
rate is 1 to 3 inches in 1 hour. Additional rainfall amounts of 1
to 3 inches 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...
Cullman, Good Hope, Holly Pond, Baldwin, Vinemont, Baileyton, West
Point, Phelan, Walter, Logan, Battleground, Jones Chapel and Joppa.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
In hilly terrain there are hundreds of low water crossings which are
potentially dangerous in heavy rain. Do not attempt to cross flooded
roads. Find an alternate route.
&&
LAT...LON 3410 8665 3411 8711 3431 8711 3430 8649
3429 8646 3425 8650 3425 8652 3423 8652
3422 8654 3420 8655
FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL...1-3 INCHES IN 1 HOUR
$$2 follow-up statements
827
WGUS54 KHUN 191718
FFWHUN
ALC043-191845-
/O.EXT.KHUN.FF.W.0032.000000T0000Z-210819T1845Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Huntsville AL
1218 PM CDT Thu Aug 19 2021
The National Weather Service in Huntsville has extended the
* Flash Flood Warning for...
Northwestern Cullman County in north central Alabama...
* Until 145 PM CDT.
* At 1218 PM CDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 3 and 5 inches of rain
have fallen. The expected rainfall rate is 1 to 2 inches in 1
hour. Additional rainfall amounts of 1 to 2 inches are possible in
the warned area. Flash flooding is ongoing or expected to begin
shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar.
IMPACT...Flash flooding of small creeks and streams, urban
areas, highways, streets and underpasses as well as
other poor drainage and low-lying areas.
* Some locations that will experience flash flooding include...
Cullman, Baldwin, Vinemont, West Point, Jones Chapel, Logan and
Battleground.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
In hilly terrain there are hundreds of low water crossings which are
potentially dangerous in heavy rain. Do not attempt to cross flooded
roads. Find an alternate route.
&&
LAT...LON 3411 8691 3411 8711 3427 8711 3428 8711
3429 8711 3430 8711 3431 8711 3430 8683
3428 8684 3425 8685 3419 8687
FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL...1-2 INCHES IN 1 HOUR
$$213
WGUS74 KHUN 191806
FFSHUN
Flash Flood Statement
National Weather Service Huntsville AL
106 PM CDT Thu Aug 19 2021
ALC043-191816-
/O.CAN.KHUN.FF.W.0032.000000T0000Z-210819T1845Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Cullman AL-
106 PM CDT Thu Aug 19 2021
...FLASH FLOOD WARNING FOR NORTHWESTERN CULLMAN COUNTY HAS BEEN
REPLACED WITH A FLOOD WARNING...
Heavy rainfall has diminished, thus the threat of flash flooding has
ended. However, areal flooding resulting from the earlier 3 to 5
inch rainfall can be expected for another hour or so.
LAT...LON 3411 8691 3411 8711 3427 8711 3428 8711
3429 8711 3430 8711 3431 8711 3430 8683
3428 8684 3425 8685 3419 8687
$$The office that day
Everything else NWS Huntsville, AL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 18, 7:39 PM CDT | Severe Thunderstorm Warning | HUN | Madison | 36 min |
| Aug 19, 8:17 AM CDT | Special Weather Statement | HUN | Morgan | 43 min |
| Aug 19, 9:04 AM CDT | Special Weather Statement | HUN | Cullman, Morgan | 41 min |
| Aug 19, 10:32 AM CDT | Special Weather Statement | HUN | Marshall | 43 min |
| Aug 19, 11:05 AM CDT | Special Weather Statement | HUN | DeKalb | 55 min |
| Aug 19, 11:58 AM CDT | Special Weather Statement | HUN | DeKalb | 32 min |
| Aug 19, 1:06 PM CDT | Areal Flood Warning | HUN | Cullman | 39 min |
| Aug 19, 2:22 PM CDT | Special Weather Statement | HUN | Franklin | 38 min |
| Aug 19, 2:49 PM CDT | Special Weather Statement | HUN | Franklin | 41 min |
| Aug 19, 4:45 PM CDT | Flash Flood Warning | HUN | Franklin | 3 hr |
| Aug 19, 5:51 PM CDT | Flash Flood Warning | HUN | Franklin | 2 hr |
| Aug 19, 6:18 PM CDT | Special Weather Statement | HUN | Madison | 27 min |
| Aug 19, 6:45 PM CDT | Special Weather Statement | HUN | Madison | 45 min |
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.