Alert archive / Alabama / Areal Flood Warnings in 2021

Areal Flood Warning 25, NWS Huntsville, AL

April 8, 2021Madison County, Alabama

NWS Huntsville, AL issued this areal flood warning at Apr 8, 2021, 9:44 AM CDT for Madison County, Alabama. It was in force for 3 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: Apr 8, 2021, 9:44 AM CDT (14:44 UTC)
Expired: Apr 8, 2021, 12:45 PM CDT
In force: 3 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 14:48 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, 2.7 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: 55 J/kg
Mixed-layer CIN: -72 J/kg
Mixed-layer LCL: 626 m above ground
0-6 km bulk shear: 52 kt
0-1 km storm-relative helicity: 354 m²/s²
0-3 km storm-relative helicity: 375 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

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 Apr 8, 8:53 AM CDT, 51 minutes earlier.

Area forecast discussion, Apr 8, 8:53 AM CDT, 51 minutes before

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Hazardous weather outlook, Apr 8, 4:37 AM CDT, 5 hours 7 minutes before

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In the hours before

Special weather statement, Apr 8, 3:52 AM CDT, 5 hours 52 minutes before

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Special weather statement, Apr 8, 5:00 AM CDT, 4 hours 44 minutes before

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Special weather statement, Apr 8, 9:22 AM CDT, 22 minutes before

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Special weather statement, Apr 8, 9:28 AM CDT, 16 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
Apr 7, 10:20 PM CDT	Special Weather Statement	HUN	Colbert, Lauderdale	55 min
Apr 7, 11:14 PM CDT	Special Weather Statement	HUN	Colbert, Lauderdale	46 min
Apr 7, 11:55 PM CDT	Special Weather Statement	HUN	Franklin, Lawrence, Limestone	50 min
Apr 8, 12:17 AM CDT	Special Weather Statement	HUN	Franklin	28 min
Apr 8, 12:46 AM CDT	Special Weather Statement	HUN	Lawrence	44 min
Apr 8, 1:12 AM CDT	Special Weather Statement	HUN	Madison	48 min
Apr 8, 3:52 AM CDT	Special Weather Statement	HUN	Colbert	38 min
Apr 8, 4:35 AM CDT	Severe Thunderstorm Warning	HUN	Franklin	25 min
Apr 8, 5:00 AM CDT	Special Weather Statement	HUN	Colbert	30 min
Apr 8, 9:22 AM CDT	Special Weather Statement	HUN	Madison	38 min
Apr 8, 3:56 PM CDT	Areal Flood Warning	HUN	Madison	3 hr
Apr 8, 9:28 AM CDT	Special Weather Statement	HUN	Franklin	32 min
Apr 8, 9:37 AM CDT	Tornado Warning	HUN	Franklin	8 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.