Alert archive / Alabama / Flash Flood Warnings in 2021
Flash Flood Warning 37, NWS Huntsville, AL
NWS Huntsville, AL issued this flash flood warning at Sep 18, 2021, 3:51 PM CDT for Limestone County, Alabama. It was in force for 3 hr. 3 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
- Sep 18, 2021, 3:51 PM CDT (20:51 UTC)
- Expired
- Sep 18, 2021, 6:53 PM CDT
- In force
- 3 hr
- Issued by
- NWS Huntsville, AL
- Area
- Storm-based polygon
- Flood severity
- None
County Limestone County, AL
The radar
The Northeast Alabama radar (KHTX), 78 km from the middle of the area, began a volume at 20:54 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 |
|---|---|---|---|
| Sep 18, 4:03 PM CDT | FLASH FLOOD | Ardmore, AL | OCCUPANTS OF VEHICLE RESCUED FROM FLOODED DITCH AT PARK AVE IN ARDMORE. |
| Sep 18, 5:16 PM CDT | FLASH FLOOD | 4 Sw Ardmore, AL | MULTIPLE VEHICLES SUBMERGED IN THE FLOOD WATERS BETWEEN ARDMORE AND ELKMONT. |
| Sep 18, 5:35 PM CDT | FLASH FLOOD | 3 W Ardmore, AL | BARNES ROAD WASHED OUT IN ARDMORE. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Nashville Metro, TN (KBNA), launched 12:00Z, 8.9 hours before the alert went out and 144 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
- 1085 J/kg
- Mixed-layer CIN
- -15 J/kg
- Mixed-layer LCL
- 648 m above ground
- 0-6 km bulk shear
- 7 kt
- 0-1 km storm-relative helicity
- 15 m²/s²
- 0-3 km storm-relative helicity
- 51 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
830
WGUS54 KHUN 182051
FFWHUN
ALC083-190000-
/O.NEW.KHUN.FF.W.0037.210918T2051Z-210919T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Huntsville AL
351 PM CDT Sat Sep 18 2021
The National Weather Service in Huntsville has issued a
* Flash Flood Warning for...
Northeastern Limestone County in north central Alabama...
* Until 700 PM CDT.
* At 351 PM CDT, emergency management reported thunderstorms
producing heavy rain across the warned area. Flash flooding is
already occurring.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Emergency management reported.
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...
Athens, Ardmore, Elkmont, Lester, Cartwright, Holland Gin,
Leggtown, Cairo and Mt Rozell.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3478 8679 3479 8716 3500 8716 3499 8678
FLASH FLOOD...OBSERVED
$$
252 follow-up statements
907
WGUS74 KHUN 182116
FFSHUN
Flash Flood Statement
National Weather Service Huntsville AL
416 PM CDT Sat Sep 18 2021
ALC083-190000-
/O.CON.KHUN.FF.W.0037.000000T0000Z-210919T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Limestone AL-
416 PM CDT Sat Sep 18 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 7 PM CDT THIS EVENING
FOR NORTHEASTERN LIMESTONE COUNTY...
At 416 PM CDT, emergency management reported thunderstorms producing
heavy rain across the warned area. Between 1 and 3 inches of rain
have fallen. The expected rainfall rate is 1 to 2 inches in 1 hour.
Flash flooding is already occurring across the Ardmore area.
HAZARD...Life threatening flash flooding. Thunderstorms producing
flash flooding.
SOURCE...Emergency management reported multiple roads have become
impassible and a car was swept off of a road in Ardmore.
IMPACT...Life threatening flash flooding of creeks and streams,
urban areas, highways, streets and underpasses.
Some locations that will experience flash flooding include...
Athens, Ardmore, Elkmont, Lester, Cartwright, Holland Gin,
Leggtown, Cairo and Mt Rozell.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be aware of your surroundings and do not drive on flooded roads.
&&
LAT...LON 3478 8679 3479 8716 3500 8716 3499 8678
FLASH FLOOD...OBSERVED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
EXPECTED RAINFALL...1-2 INCHES IN 1 HOUR
$$
25112 WGUS74 KHUN 182353 FFSHUN Flash Flood Statement National Weather Service Huntsville AL 653 PM CDT Sat Sep 18 2021 ALC083-190003- /O.CAN.KHUN.FF.W.0037.000000T0000Z-210919T0000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Limestone AL- 653 PM CDT Sat Sep 18 2021 ...FLASH FLOOD WARNING FOR NORTHEASTERN LIMESTONE COUNTY HAS BEEN REPLACED WITH A FLOOD WARNING... The heavy rain has ended. Please continue to heed remaining road closures. A Flash Flood Watch remains in effect until 700 PM CDT Sunday for portions of Alabama and southern middle Tennessee. LAT...LON 3478 8679 3479 8716 3500 8716 3499 8678 $$ 25
The office that day
Everything else NWS Huntsville, AL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 17, 7:59 PM CDT | Areal Flood Warning | HUN | Lauderdale | 116 min |
| Sep 18, 2:24 AM CDT | Flash Flood Watch | HUN | Colbert, Cullman, DeKalb, Franklin, Jackson, Lauderdale and 5 more | 65 hr |
| Sep 18, 5:11 PM CDT | Flash Flood Warning | HUN | Limestone, Morgan | 3 hr |
| Sep 18, 6:53 PM CDT | Areal Flood Warning | HUN | Limestone, Morgan | 6 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.