Alert archive / Alabama / Flash Flood Warnings in 2021
Flash Flood Warning 24, NWS Huntsville, AL
NWS Huntsville, AL issued this flash flood warning at Jul 18, 2021, 9:07 PM CDT for 4 counties in Alabama. It was in force for 3 hr. 4 reports 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
- Jul 18, 2021, 9:07 PM CDT (02:07 UTC)
- Expired
- Jul 19, 2021, 12:15 AM CDT
- In force
- 3 hr
- Issued by
- NWS Huntsville, AL
- Area
- Storm-based polygon
- Flood severity
- None
Counties Lawrence County, AL, Limestone County, AL, Madison County, AL, Morgan County, AL
The radar
The Northeast Alabama radar (KHTX), 90 km from the middle of the area, began a volume at 02:11 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 |
|---|---|---|---|
| Jul 18, 9:11 PM CDT | FLASH FLOOD | 3 Ne Trinity, AL | FLOODING REPORTED AT THE INTERSECTION OF WOODALL ROAD AND HIGHWAY 20. |
| Jul 18, 9:47 PM CDT | FLASH FLOOD | 4 W Mooresville, AL | CORRECTS PREVIOUS FLASH FLOOD REPORT FROM 4 W MOORESVILLE. FLOODING REPORTED AT THE Y JUST BEFORE THE HUDSON MEMORIAL BRIDGE ON HIGHWAY 20. |
| Jul 18, 9:47 PM CDT | FLASH FLOOD | 4 W Mooresville, AL | FLOODING REPORTED AT THIS LOCATION. |
| Jul 18, 10:09 PM CDT | FLASH FLOOD | 3 Nne Decatur, AL | CORRECTS PREVIOUS FLASH FLOOD REPORT FROM 3 NNE DECATUR. FLOODING REPORTED AND THE INTERSECTION OF CHURCH AND 6TH AVENUE NE. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Birmingham, AL (KBMX), launched 00:00Z, 2.1 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
- 200 J/kg
- Mixed-layer CIN
- -66 J/kg
- Mixed-layer LCL
- 867 m above ground
- 0-6 km bulk shear
- 21 kt
- 0-1 km storm-relative helicity
- 45 m²/s²
- 0-3 km storm-relative helicity
- 75 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.3
The text
As transmitted.
029
WGUS54 KHUN 190207
FFWHUN
ALC079-083-089-103-190515-
/O.NEW.KHUN.FF.W.0024.210719T0207Z-210719T0515Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Huntsville AL
907 PM CDT Sun Jul 18 2021
The National Weather Service in Huntsville has issued a
* Flash Flood Warning for...
Southern Limestone County in north central Alabama...
Southwestern Madison County in north central Alabama...
Northern Morgan County in north central Alabama...
Northeastern Lawrence County in northwestern Alabama...
* Until 1215 AM CDT.
* At 907 PM CDT, Doppler radar and automated rain gauges indicated
heavy rain falling across the warned area. Between 2 and 3 inches
of rain have fallen. 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 heavy rain.
SOURCE...Radar and automated gauges.
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...
Decatur, Madison, Redstone Arsenal, Priceville, Trinity, Triana,
Tanner, Huntsville International Airport, Hillsboro, Mooresville,
Belle Mina, Caddo, Wheeler and Valhermoso Springs.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be especially cautious at night when it is harder to recognize the
dangers of flooding.
&&
LAT...LON 3479 8726 3464 8661 3447 8664 3458 8728
FLASH FLOOD...RADAR AND GAUGE INDICATED
$$
GH2 follow-up statements
543
WGUS74 KHUN 190312
FFSHUN
Flash Flood Statement
National Weather Service Huntsville AL
1012 PM CDT Sun Jul 18 2021
ALC079-083-089-103-190515-
/O.CON.KHUN.FF.W.0024.000000T0000Z-210719T0515Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Lawrence AL-Limestone AL-Madison AL-Morgan AL-
1012 PM CDT Sun Jul 18 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1215 AM CDT MONDAY
FOR SOUTHERN LIMESTONE, SOUTHWESTERN MADISON, NORTHERN MORGAN AND
NORTHEASTERN LAWRENCE COUNTIES...
At 1012 PM CDT, Doppler radar and automated rain gauges indicated
that heavy rain was falling across the warned area. Between 3 and 5
inches of rain have fallen. Additional rainfall amounts of 1 to 2
inches are possible in the warned area. Flash flooding is ongoing or
expected to begin shortly.
HAZARD...Flash flooding caused by heavy rain.
SOURCE...Radar and automated gauges.
IMPACT...Flash flooding of small creeks and streams, urban areas,
highways, streets and underpasses as well as other poor
drainage and low-lying areas.
Some locations that will experience flash flooding include...
Decatur, Madison, Redstone Arsenal, Priceville, Trinity, Triana,
Tanner, Huntsville International Airport, Hillsboro, Mooresville,
Belle Mina, Caddo, Wheeler and Valhermoso Springs.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be especially cautious at night when it is harder to recognize the
dangers of flooding.
&&
LAT...LON 3479 8726 3464 8661 3447 8664 3458 8728
FLASH FLOOD...RADAR AND GAUGE INDICATED
$$
GH009 WGUS74 KHUN 190511 FFSHUN Flash Flood Statement National Weather Service Huntsville AL 1211 AM CDT Mon Jul 19 2021 ALC079-083-089-103-190521- /O.EXP.KHUN.FF.W.0024.000000T0000Z-210719T0515Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Lawrence AL-Limestone AL-Madison AL-Morgan AL- 1211 AM CDT Mon Jul 19 2021 ...FLASH FLOOD WARNING WILL EXPIRE AT 1215 AM CDT EARLY THIS MORNING FOR SOUTHERN LIMESTONE, SOUTHWESTERN MADISON, NORTHERN MORGAN AND NORTHEASTERN LAWRENCE COUNTIES... Flood waters have receded. Flooding is no longer expected to pose a threat. Please continue to heed remaining road closures. LAT...LON 3479 8726 3464 8661 3447 8664 3458 8728 $$ KTW
The office that day
Everything else NWS Huntsville, AL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 18, 7:09 PM CDT | Special Weather Statement | HUN | Madison | 36 min |
| Jul 18, 7:16 PM CDT | Special Weather Statement | HUN | Cullman | 44 min |
| Jul 18, 7:20 PM CDT | Special Weather Statement | HUN | Limestone | 40 min |
| Jul 18, 7:44 PM CDT | Special Weather Statement | HUN | Franklin | 46 min |
| Jul 19, 9:19 AM CDT | Flash Flood Watch | HUN | Colbert, Cullman, DeKalb, Franklin, Jackson, Lauderdale and 5 more | 34 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.