Alert archive / Alabama / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 136, NWS Huntsville, AL

July 2, 2012Lawrence County, Alabama

NWS Huntsville, AL issued this severe thunderstorm warning at Jul 2, 2012, 9:27 AM CDT for Lawrence County, Alabama. It was in force for 33 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: Jul 2, 2012, 9:27 AM CDT (14:27 UTC)
Expired: Jul 2, 2012, 10:00 AM CDT
In force: 33 min
Issued by: NWS Huntsville, AL
Area: Storm-based polygon

County Lawrence County, AL

The radar

The Columbus AFB radar (KGWX), 117 km from the middle of the area, began a volume at 14:29 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, 2.5 hours before the alert went out and 157 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: 2191 J/kg
Mixed-layer CIN: -62 J/kg
Mixed-layer LCL: 771 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 23 m²/s²
0-3 km storm-relative helicity: 33 m²/s²
Significant tornado parameter: 0.1
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 Jul 2, 6:15 AM CDT, 3 hours 12 minutes earlier.

Area forecast discussion, Jul 2, 6:15 AM CDT, 3 hours 12 minutes before

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Hazardous weather outlook, Jul 2, 4:10 AM CDT, 5 hours 17 minutes before

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In the hours before

Special weather statement, Jul 2, 9:17 AM CDT, 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
Jul 1, 7:06 PM CDT	Severe Thunderstorm Warning	HUN	Colbert, Lauderdale, Lawrence	27 min
Jul 1, 7:10 PM CDT	Severe Thunderstorm Warning	HUN	DeKalb	65 min
Jul 1, 7:17 PM CDT	Special Weather Statement	HUN	Marshall	28 min
Jul 1, 7:43 PM CDT	Severe Thunderstorm Warning	HUN	DeKalb, Jackson, Marshall	62 min
Jul 1, 8:44 PM CDT	Severe Thunderstorm Warning	HUN	DeKalb, Jackson	31 min
Jul 2, 9:17 AM CDT	Special Weather Statement	HUN	Lawrence	28 min
Jul 2, 10:18 AM CDT	Special Weather Statement	HUN	Lauderdale	27 min
Jul 2, 6:23 PM CDT	Special Weather Statement	HUN	Franklin	52 min

Nearby

Severe Thunderstorm Warnings in Alabama, 2012 Every severe thunderstorm warning in 2012

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.