Alert archive / Alabama / Flash Flood Warnings in 2021
Flash Flood Warning 25, NWS Huntsville, AL
NWS Huntsville, AL issued this flash flood warning at Jul 20, 2021, 4:40 PM CDT for Limestone County, Alabama. It was in force for 2 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
- Jul 20, 2021, 4:40 PM CDT (21:40 UTC)
- Expired
- Jul 20, 2021, 7:04 PM CDT
- In force
- 2 hr
- Issued by
- NWS Huntsville, AL
- Area
- Storm-based polygon
- Flood severity
- None
County Limestone County, AL
The radar
The Northeast Alabama radar (KHTX), 92 km from the middle of the area, began a volume at 21:39 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
Nashville Metro, TN (KBNA), launched 12:00Z, 9.7 hours before the alert went out and 161 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
- 133 J/kg
- Mixed-layer CIN
- -72 J/kg
- Mixed-layer LCL
- 925 m above ground
- 0-6 km bulk shear
- 5 kt
- 0-1 km storm-relative helicity
- -26 m²/s²
- 0-3 km storm-relative helicity
- -27 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
635
WGUS54 KHUN 202140
FFWHUN
ALC083-210045-
/O.NEW.KHUN.FF.W.0025.210720T2140Z-210721T0045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Huntsville AL
440 PM CDT Tue Jul 20 2021
The National Weather Service in Huntsville has issued a
* Flash Flood Warning for...
Central Limestone County in north central Alabama...
* Until 745 PM CDT.
* At 440 PM CDT, Doppler radar indicated thunderstorms producing
heavy rain across portions of central and southwestern Limestone
County. Between 2 and 3 inches of rain have fallen. 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...
Decatur, Athens, Tanner and Ripley.
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 3470 8712 3472 8713 3474 8717 3484 8705
3484 8690 3474 8693 3465 8704 3467 8709
FLASH FLOOD...RADAR INDICATED
$$
121 follow-up statement
792
WGUS74 KHUN 210004
FFSHUN
Flash Flood Statement
National Weather Service Huntsville AL
704 PM CDT Tue Jul 20 2021
ALC083-210014-
/O.CAN.KHUN.FF.W.0025.000000T0000Z-210721T0045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Limestone AL-
704 PM CDT Tue Jul 20 2021
...FLASH FLOOD WARNING IS CANCELLED FOR CENTRAL LIMESTONE COUNTY...
The heavy rain has ended. Flooding is no longer expected to pose a
threat. Please continue to heed remaining road closures.
A Flash Flood Watch remains in effect until 1000 PM CDT for portions
of Alabama and southern middle Tennessee.
LAT...LON 3470 8712 3472 8713 3474 8717 3484 8705
3484 8690 3474 8693 3465 8704 3467 8709
$$
12Nearby
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.