Alert archive / Alabama / Severe Thunderstorm Warnings in 2014

Severe Thunderstorm Warning 16, NWS Huntsville, AL

February 21, 2014DeKalb County, Alabama

NWS Huntsville, AL issued this severe thunderstorm warning at Feb 21, 2014, 12:03 AM CST for DeKalb County, Alabama. It was in force for 42 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Feb 21, 2014, 12:03 AM CST (06:03 UTC)
Expired: Feb 21, 2014, 12:45 AM CST
In force: 42 min
Issued by: NWS Huntsville, AL
Area: Storm-based polygon

County DeKalb County, AL

The radar

The Northeast Alabama radar (KHTX), 58 km from the middle of the area, began a volume at 06:03 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Feb 20, 6:49 PM CST	Tornado Watch	SPC	6 hr

The nearest sounding before it

Birmingham, AL (KBMX), launched 00:00Z, 6.1 hours before the alert went out and 168 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: 755 J/kg
Mixed-layer CIN: -6 J/kg
Mixed-layer LCL: 734 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 181 m²/s²
0-3 km storm-relative helicity: 208 m²/s²
Significant tornado parameter: 0.8
Supercell composite: 3.7

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm 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 severe thunderstorm warning went out at Feb 20, 10:58 PM CST, 1 hour 5 minutes earlier.

Area forecast discussion, Feb 20, 10:58 PM CST, 1 hour 5 minutes before

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Hazardous weather outlook, Feb 20, 11:04 PM CST, 59 minutes before

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In the hours before

Local storm report, Feb 20, 10:55 PM CST, 1 hour 8 minutes before

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Local storm report, Feb 20, 10:56 PM CST, 1 hour 7 minutes before

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Local storm report, Feb 20, 11:01 PM CST, 1 hour 2 minutes before

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Local storm report, Feb 20, 11:20 PM CST, 43 minutes before

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Local storm report, Feb 20, 11:24 PM CST, 39 minutes before

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Local storm report, Feb 20, 11:40 PM CST, 23 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
Feb 20, 7:00 PM CST	Special Weather Statement	HUN	Colbert	45 min
Feb 20, 7:26 PM CST	Severe Thunderstorm Warning	HUN	Lauderdale	34 min
Feb 20, 7:44 PM CST	Severe Thunderstorm Warning	HUN	Colbert, Franklin	31 min
Feb 20, 8:06 PM CST	Severe Thunderstorm Warning	HUN	Colbert, Lauderdale	39 min
Feb 20, 8:14 PM CST	Severe Thunderstorm Warning	HUN	Colbert, Franklin	46 min
Feb 20, 8:42 PM CST	Severe Thunderstorm Warning	HUN	Colbert, Lauderdale, Lawrence, Limestone	48 min
Feb 20, 8:46 PM CST	Severe Thunderstorm Warning	HUN	Franklin, Lawrence	29 min
Feb 20, 9:11 PM CST	Tornado Warning	HUN	Limestone	34 min
Feb 20, 9:14 PM CST	Severe Thunderstorm Warning	HUN	Limestone, Madison, Morgan	31 min
Feb 20, 9:21 PM CST	Severe Thunderstorm Warning	HUN	Cullman, Lawrence, Morgan	39 min
Feb 20, 9:34 PM CST	Severe Thunderstorm Warning	HUN	Madison, Morgan	26 min
Feb 20, 9:41 PM CST	Tornado Warning	HUN	Madison	49 min
Feb 20, 9:43 PM CST	Severe Thunderstorm Warning	HUN	Limestone, Madison	32 min
Feb 20, 9:52 PM CST	Flash Flood Warning	HUN	Franklin, Lawrence, Morgan	3 hr
Feb 20, 9:59 PM CST	Severe Thunderstorm Warning	HUN	Jackson, Madison	46 min
Feb 20, 10:01 PM CST	Severe Thunderstorm Warning	HUN	Cullman, Morgan	44 min
Feb 20, 10:06 PM CST	Flash Flood Warning	HUN	Limestone, Madison, Morgan	3 hr
Feb 20, 10:47 PM CST	Special Weather Statement	HUN	Cullman	43 min
Feb 20, 10:51 PM CST	Severe Thunderstorm Warning	HUN	Cullman	39 min
Feb 20, 11:14 PM CST	Severe Thunderstorm Warning	HUN	Jackson	46 min
Feb 20, 11:43 PM CST	Severe Thunderstorm Warning	HUN	DeKalb, Jackson	32 min
Feb 21, 12:32 AM CST	Tornado Warning	HUN	DeKalb	43 min
Feb 21, 12:35 AM CST	Areal Flood Warning	HUN	Franklin, Lawrence, Limestone, Madison, Morgan	4 hr
Feb 21, 4:30 AM CST	Areal Flood Warning	HUN	Madison	6 hr
Feb 21, 10:40 AM CST	River Flood Warning	HUN	Jackson, Madison, Marshall	43 hr
Feb 21, 10:48 AM CST	River Flood Warning	HUN	Madison	9 hr
Feb 20, 10:11 PM CST	Tornado Warning	HUN	Franklin	49 min

Nearby

Severe Thunderstorm Warnings in Alabama, 2014 Every severe thunderstorm warning in 2014

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.