Alert archive / Alabama / Areal Flood Warnings in 2021

Areal Flood Warning 53, NWS Huntsville, AL

October 5, 2021Colbert County, Lauderdale County, Lawrence County, Alabama

NWS Huntsville, AL issued this areal flood warning at Oct 5, 2021, 9:56 PM CDT for Colbert County, Lauderdale County, Lawrence County, Alabama. It was in force for 6 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Oct 5, 2021, 9:56 PM CDT (02:56 UTC)
Expired: Oct 6, 2021, 4:00 AM CDT
In force: 6 hr
Issued by: NWS Huntsville, AL
Area: Storm-based polygon
Flood severity: None

Counties Colbert County, AL, Lauderdale County, AL, Lawrence County, AL

The radar

The Columbus AFB radar (KGWX), 113 km from the middle of the area, began a volume at 02:58 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 00:00Z, 2.9 hours before the alert went out and 182 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 334 J/kg
Mixed-layer CIN: -6 J/kg
Mixed-layer LCL: 725 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 113 m²/s²
0-3 km storm-relative helicity: 131 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this areal flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Huntsville, AL wrote its last area forecast discussion before this areal flood warning went out at Oct 5, 9:10 PM CDT, 46 minutes earlier.

Area forecast discussion, Oct 5, 9:10 PM CDT, 46 minutes before

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Hazardous weather outlook, Oct 5, 2:59 PM CDT, 6 hours 57 minutes before

Hazardous Weather Outlook
National Weather Service Huntsville AL
259 PM CDT Tue Oct 5 2021

ALZ001>010-016-TNZ076-096-097-061100-
Lauderdale-Colbert-Franklin AL-Lawrence-Limestone-Madison-Morgan-
Marshall-Jackson-DeKalb-Cullman-Moore-Lincoln-Franklin TN-
259 PM CDT Tue Oct 5 2021

This Hazardous Weather Outlook is for north Alabama and portions of
southern middle Tennessee.

.DAY ONE...Tonight...

Scattered thunderstorms are anticipated across the Tennessee Valley
tonight, within more widespread showers. A few strong thunderstorms
are possible this evening, with wind gusts of 40 to 50 mph, and
frequent lightning. Otherwise, locally heavy rainfall and flooding
will be the primary hazard. A Flash Flood Watch remains in effect for
all counties in the outlook area through late Wednesday evening.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday...

Widespread showers and scattered thunderstorms will continue across
the region on Wednesday and Wednesday night, before gradually ending
from southwest to northeast on Thursday and Thursday evening.
Conditions will be favorable for some of the storms to become strong
to marginally severe during Wednesday, with the main threat strong to
damaging wind gusts of 50 to 60 mph and frequent lightning. Flash
flooding risks will continue, with rainfall totals of four to five
inches possible.

.SPOTTER CALL TO ACTION STATEMENT...

Activation of storm spotters and emergency management personnel is
not anticipated at this time.

In the hours before

Local storm report, Oct 5, 5:58 PM CDT, 3 hours 58 minutes before

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Local storm report, Oct 5, 6:06 PM CDT, 3 hours 50 minutes before

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Local storm report, Oct 5, 7:09 PM CDT, 2 hours 47 minutes before

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Local storm report, Oct 5, 7:12 PM CDT, 2 hours 44 minutes before

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The office that day

Everything else NWS Huntsville, AL issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Oct 5, 10:35 PM CDT	Special Weather Statement	HUN	Franklin	55 min
Oct 6, 6:14 AM CDT	River Flood Warning	HUN	Lawrence	40 hr
Oct 6, 7:41 AM CDT	Special Weather Statement	HUN	Marshall	49 min
Oct 6, 2:11 PM CDT	Special Weather Statement	HUN	Cullman	49 min
Oct 6, 3:55 PM CDT	Severe Thunderstorm Warning	HUN	Cullman, Madison, Marshall, Morgan	50 min
Oct 6, 4:07 PM CDT	Special Weather Statement	HUN	Jackson	38 min
Oct 6, 4:35 PM CDT	Special Weather Statement	HUN	Cullman	25 min
Oct 6, 4:37 PM CDT	River Flood Warning	HUN	Jackson, Madison, Marshall	71 hr
Oct 6, 4:45 PM CDT	Special Weather Statement	HUN	Madison, Marshall	45 min
Oct 6, 4:54 PM CDT	Severe Thunderstorm Warning	HUN	Jackson, Madison	36 min
Oct 6, 5:14 PM CDT	Flash Flood Warning	HUN	Madison, Marshall	8 hr
Oct 6, 6:12 PM CDT	Special Weather Statement	HUN	Colbert	33 min
Oct 6, 6:25 PM CDT	Severe Thunderstorm Warning	HUN	Colbert, Lauderdale	35 min
Oct 6, 6:54 PM CDT	Flash Flood Warning	HUN	Jackson	6 hr
Oct 6, 6:58 PM CDT	Severe Thunderstorm Warning	HUN	Colbert, Lauderdale	16 min
Oct 6, 5:45 PM CDT	Special Weather Statement	HUN	Lincoln	45 min
Oct 6, 6:13 PM CDT	Special Weather Statement	HUN	Franklin	47 min

Nearby

Areal Flood Warnings in Alabama, 2021 Every areal 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.