Alert archive / Alabama / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 236, NWS Huntsville, AL

June 28, 2011Franklin County, Alabama

NWS Huntsville, AL issued this severe thunderstorm warning at Jun 28, 2011, 11:18 AM CDT for Franklin County, Alabama. It was in force for 23 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: Jun 28, 2011, 11:18 AM CDT (16:18 UTC)
Expired: Jun 28, 2011, 11:41 AM CDT
In force: 23 min
Issued by: NWS Huntsville, AL
Area: Storm-based polygon

County Franklin County, AL

The radar

The Columbus AFB radar (KGWX), 75 km from the middle of the area, began a volume at 16:21 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
Jun 28, 4:17 AM CDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Birmingham, AL (KBMX), launched 12:00Z, 4.3 hours before the alert went out and 171 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: 2747 J/kg
Mixed-layer CIN: -41 J/kg
Mixed-layer LCL: 769 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 43 m²/s²
0-3 km storm-relative helicity: 34 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 Jun 28, 10:08 AM CDT, 1 hour 10 minutes earlier.

Area forecast discussion, Jun 28, 10:08 AM CDT, 1 hour 10 minutes before

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Hazardous weather outlook, Jun 28, 10:23 AM CDT, 55 minutes before

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In the hours before

Local storm report, Jun 28, 10:51 AM CDT, 27 minutes before

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Local storm report, Jun 28, 10:53 AM CDT, 25 minutes before

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Local storm report, Jun 28, 10:55 AM CDT, 23 minutes before

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Local storm report, Jun 28, 10:57 AM CDT, 21 minutes before

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Local storm report, Jun 28, 11:04 AM CDT, 14 minutes before

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Local storm report, Jun 28, 11:08 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
Jun 28, 6:56 AM CDT	Special Weather Statement	HUN	Limestone	49 min
Jun 28, 7:05 AM CDT	Special Weather Statement	HUN	Jackson	25 min
Jun 28, 7:20 AM CDT	Special Weather Statement	HUN	DeKalb	40 min
Jun 28, 7:44 AM CDT	Special Weather Statement	HUN	Colbert, Lauderdale, Limestone	46 min
Jun 28, 7:58 AM CDT	Flash Flood Warning	HUN	Colbert, Lauderdale, Lawrence, Limestone	5 hr
Jun 28, 8:14 AM CDT	Severe Thunderstorm Warning	HUN	Colbert, Franklin, Lauderdale, Lawrence	46 min
Jun 28, 8:42 AM CDT	Flash Flood Warning	HUN	Colbert, Franklin, Lauderdale, Lawrence	4 hr
Jun 28, 9:19 AM CDT	Special Weather Statement	HUN	Colbert, Lawrence	41 min
Jun 28, 9:25 AM CDT	Flash Flood Watch	HUN	Colbert, Cullman, DeKalb, Franklin, Jackson, Lauderdale and 5 more	8 hr
Jun 28, 10:05 AM CDT	Flash Flood Warning	HUN	Franklin, Lawrence	3 hr
Jun 28, 10:34 AM CDT	Severe Thunderstorm Warning	HUN	Colbert, Franklin, Lauderdale	41 min
Jun 28, 12:58 PM CDT	Areal Flood Warning	HUN	Colbert, Franklin, Lauderdale, Lawrence, Limestone	6 hr
Jun 28, 5:35 AM CDT	Severe Thunderstorm Warning	HUN	Franklin	40 min
Jun 28, 5:46 AM CDT	Severe Thunderstorm Warning	HUN	Franklin, Lincoln, Moore	44 min
Jun 28, 6:17 AM CDT	Severe Thunderstorm Warning	HUN	Franklin, Moore	43 min

Nearby

Severe Thunderstorm Warnings in Alabama, 2011 Every severe thunderstorm warning in 2011

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.