Alert archive / Alabama / Areal Flood Warnings in 2021

Areal Flood Warning 57, NWS Huntsville, AL

December 30, 2021Madison County, Alabama

NWS Huntsville, AL issued this areal flood warning at Dec 30, 2021, 2:10 AM CST for Madison 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: Dec 30, 2021, 2:10 AM CST (08:10 UTC)
Expired: Dec 30, 2021, 8:15 AM CST
In force: 6 hr
Issued by: NWS Huntsville, AL
Area: Storm-based polygon
Flood severity: None

County Madison County, AL

The radar

The Northeast Alabama radar (KHTX), 46 km from the middle of the area, began a volume at 08:14 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, 8.2 hours before the alert went out and 152 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1029 m above ground
0-6 km bulk shear: 70 kt
0-1 km storm-relative helicity: -111 m²/s²
0-3 km storm-relative helicity: 75 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 Dec 29, 5:33 PM CST, 8 hours 37 minutes earlier.

Area forecast discussion, Dec 29, 5:33 PM CST, 8 hours 37 minutes before

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Hazardous weather outlook, Dec 29, 10:11 AM CST, 15 hours 59 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
Dec 29, 6:28 PM CST	Special Weather Statement	HUN	Lawrence	32 min
Dec 29, 6:36 PM CST	Special Weather Statement	HUN	Madison	39 min
Dec 29, 6:57 PM CST	Special Weather Statement	HUN	Morgan	48 min
Dec 29, 7:04 PM CST	River Flood Warning	HUN	Jackson, Madison, Marshall	6 days
Dec 29, 7:10 PM CST	Special Weather Statement	HUN	Jackson	50 min
Dec 29, 7:35 PM CST	Severe Thunderstorm Warning	HUN	Cullman	40 min
Dec 29, 7:58 PM CST	Special Weather Statement	HUN	Marshall	32 min
Dec 29, 8:15 PM CST	Special Weather Statement	HUN	DeKalb	30 min
Dec 29, 8:18 PM CST	Tornado Warning	HUN	DeKalb, Jackson	27 min
Dec 29, 9:53 PM CST	Areal Flood Warning	HUN	Madison	112 min
Dec 30, 5:50 AM CST	River Flood Warning	HUN	Madison	16 hr

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.