Alert archive / Alabama / Severe Thunderstorm Warnings in 2014

Severe Thunderstorm Warning 141, NWS Huntsville, AL

December 23, 2014DeKalb County, Alabama

NWS Huntsville, AL issued this severe thunderstorm warning at Dec 23, 2014, 1:39 PM CST for DeKalb County, Alabama. It was in force for 36 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: Dec 23, 2014, 1:39 PM CST (19:39 UTC)
Expired: Dec 23, 2014, 2:15 PM CST
In force: 36 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 19:40 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

Birmingham, AL (KBMX), launched 12:00Z, 7.7 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: 79 J/kg
Mixed-layer CIN: -65 J/kg
Mixed-layer LCL: 481 m above ground
0-6 km bulk shear: 67 kt
0-1 km storm-relative helicity: 147 m²/s²
0-3 km storm-relative helicity: 226 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.9

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 Dec 23, 11:32 AM CST, 2 hours 7 minutes earlier.

Area forecast discussion, Dec 23, 11:32 AM CST, 2 hours 7 minutes before

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Hazardous weather outlook, Dec 23, 11:39 AM CST, 2 hours before

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In the hours before

Special weather statement, Dec 23, 11:25 AM CST, 2 hours 14 minutes before

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Special weather statement, Dec 23, 12:53 PM CST, 46 minutes before

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Special weather statement, Dec 23, 1:16 PM CST, 23 minutes before

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Special weather statement, Dec 23, 1:32 PM CST, 7 minutes before

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Special weather statement, Dec 23, 1:34 PM CST, 5 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 23, 11:25 AM CST	Special Weather Statement	HUN	DeKalb	35 min
Dec 23, 12:53 PM CST	Special Weather Statement	HUN	Morgan	22 min
Dec 23, 1:16 PM CST	Special Weather Statement	HUN	Madison	29 min
Dec 23, 1:34 PM CST	Special Weather Statement	HUN	DeKalb	26 min
Dec 23, 2:21 PM CST	Special Weather Statement	HUN	Jackson	24 min
Dec 23, 4:53 PM CST	Special Weather Statement	HUN	Marshall	37 min
Dec 23, 4:58 PM CST	Special Weather Statement	HUN	Cullman	32 min
Dec 23, 5:47 PM CST	Flash Flood Warning	HUN	Madison	6 hr
Dec 23, 1:32 PM CST	Special Weather Statement	HUN	Lincoln, Moore	43 min
Dec 23, 2:00 PM CST	Special Weather Statement	HUN	Franklin	45 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.