Alert archive / Alabama / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 129, NWS Huntsville, AL

December 31, 2018Lauderdale County, Lawrence County, Limestone County, Alabama

NWS Huntsville, AL issued this severe thunderstorm warning at Dec 31, 2018, 2:36 PM CST for Lauderdale County, Lawrence County, Limestone County, Alabama. It was in force for 24 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 31, 2018, 2:36 PM CST (20:36 UTC)
Expired: Dec 31, 2018, 3:00 PM CST
In force: 24 min
Issued by: NWS Huntsville, AL
Area: Storm-based polygon
Tornado: Possible
Hail: 0.75 in
Wind: 60.0 mph

Counties Lauderdale County, AL, Lawrence County, AL, Limestone County, AL

The radar

The Northeast Alabama radar (KHTX), 114 km from the middle of the area, began a volume at 20:35 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
Dec 31, 11:47 AM CST	Tornado Watch	SPC	5 hr

The nearest sounding before it

Nashville Metro, TN (KBNA), launched 12:00Z, 8.6 hours before the alert went out and 167 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: 470 m above ground
0-6 km bulk shear: 58 kt
0-1 km storm-relative helicity: 631 m²/s²
0-3 km storm-relative helicity: 689 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

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 31, 1:24 PM CST, 1 hour 12 minutes earlier.

Area forecast discussion, Dec 31, 1:24 PM CST, 1 hour 12 minutes before

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Hazardous weather outlook, Dec 31, 12:22 PM CST, 2 hours 14 minutes before

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In the hours before

Special weather statement, Dec 31, 12:51 PM CST, 1 hour 45 minutes before

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Special weather statement, Dec 31, 1:26 PM CST, 1 hour 10 minutes before

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Local storm report, Dec 31, 2:14 PM CST, 22 minutes before

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Local storm report, Dec 31, 2:19 PM CST, 17 minutes before

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Special weather statement, Dec 31, 2:24 PM CST, 12 minutes before

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Local storm report, Dec 31, 2:26 PM CST, 10 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 30, 11:59 PM CST	Dense Fog Advisory	HUN	Cullman, DeKalb, Franklin, Lawrence, Marshall, Morgan	7 hr
Dec 31, 1:54 AM CST	Wind Advisory	HUN	Colbert, Cullman, DeKalb, Franklin, Jackson, Lauderdale and 5 more	16 hr
Dec 31, 12:51 PM CST	Special Weather Statement	HUN	Colbert	39 min
Dec 31, 1:26 PM CST	Special Weather Statement	HUN	Colbert, Franklin, Lauderdale	49 min
Dec 31, 1:57 PM CST	Severe Thunderstorm Warning	HUN	Franklin	33 min
Dec 31, 2:24 PM CST	Special Weather Statement	HUN	Lawrence	51 min
Dec 31, 3:01 PM CST	Special Weather Statement	HUN	Cullman, Limestone, Madison, Morgan	44 min
Dec 31, 3:43 PM CST	Special Weather Statement	HUN	Madison	47 min
Dec 31, 4:28 PM CST	Special Weather Statement	HUN	Jackson	47 min
Dec 31, 4:40 PM CST	Special Weather Statement	HUN	Marshall	35 min

Nearby

Severe Thunderstorm Warnings in Alabama, 2018 Every severe thunderstorm warning in 2018

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.