Alert archive / Alabama / Severe Thunderstorm Warnings in 2006

Severe Thunderstorm Warning 99, NWS Huntsville, AL

April 21, 2006Marshall County, Alabama

NWS Huntsville, AL issued this severe thunderstorm warning at Apr 21, 2006, 5:36 PM CDT for Marshall 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: Apr 21, 2006, 5:36 PM CDT (22:36 UTC)
Expired: Apr 21, 2006, 6:00 PM CDT
In force: 24 min
Issued by: NWS Huntsville, AL
Area: Counties, with a storm outline in the text

County Marshall County, AL

The radar

The Northeast Alabama radar (KHTX), 66 km from the middle of the area, began a volume at 22:37 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
Apr 21, 1:24 PM CDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Birmingham, AL (KBMX), launched 12:00Z, 10.6 hours before the alert went out and 139 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: 694 J/kg
Mixed-layer CIN: -74 J/kg
Mixed-layer LCL: 739 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 162 m²/s²
0-3 km storm-relative helicity: 329 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 4.6

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 Apr 21, 1:00 PM CDT, 4 hours 36 minutes earlier.

Area forecast discussion, Apr 21, 1:00 PM CDT, 4 hours 36 minutes before

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Hazardous weather outlook, Apr 21, 12:43 PM CDT, 4 hours 53 minutes before

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In the hours before

Local storm report, Apr 21, 3:47 PM CDT, 1 hour 49 minutes before

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Local storm report, Apr 21, 3:55 PM CDT, 1 hour 41 minutes before

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Special weather statement, Apr 21, 4:18 PM CDT, 1 hour 18 minutes before

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Local storm report, Apr 21, 4:21 PM CDT, 1 hour 15 minutes before

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Special weather statement, Apr 21, 5:06 PM CDT, 30 minutes before

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Special weather statement, Apr 21, 5:22 PM CDT, 14 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
Apr 20, 7:36 PM CDT	Severe Thunderstorm Warning	HUN	Jackson	39 min
Apr 20, 7:44 PM CDT	Severe Thunderstorm Warning	HUN	Madison	31 min
Apr 21, 12:49 AM CDT	Severe Thunderstorm Warning	HUN	Limestone	41 min
Apr 21, 2:43 AM CDT	Severe Thunderstorm Warning	HUN	Cullman	62 min
Apr 21, 3:10 AM CDT	Severe Thunderstorm Warning	HUN	Marshall	53 min
Apr 21, 3:43 AM CDT	Severe Thunderstorm Warning	HUN	Jackson	33 min
Apr 21, 4:00 AM CDT	Flash Flood Watch	HUN	Cullman, DeKalb, Marshall	21 hr
Apr 21, 4:43 AM CDT	Severe Thunderstorm Warning	HUN	Marshall	27 min
Apr 21, 5:02 AM CDT	Severe Thunderstorm Warning	HUN	Jackson	43 min
Apr 21, 5:09 AM CDT	Severe Thunderstorm Warning	HUN	Madison	21 min
Apr 21, 5:37 AM CDT	Severe Thunderstorm Warning	HUN	Morgan	38 min
Apr 21, 6:15 AM CDT	Severe Thunderstorm Warning	HUN	Morgan	45 min
Apr 21, 6:21 AM CDT	Severe Thunderstorm Warning	HUN	Morgan	39 min
Apr 21, 6:34 AM CDT	Severe Thunderstorm Warning	HUN	Madison	41 min
Apr 21, 7:01 AM CDT	Severe Thunderstorm Warning	HUN	Limestone	29 min
Apr 21, 3:18 PM CDT	Severe Thunderstorm Warning	HUN	Jackson	18 min
Apr 21, 3:20 PM CDT	Severe Thunderstorm Warning	HUN	Jackson, Madison	40 min
Apr 21, 3:26 PM CDT	Severe Thunderstorm Warning	HUN	DeKalb	49 min
Apr 21, 3:55 PM CDT	Severe Thunderstorm Warning	HUN	Jackson	35 min
Apr 21, 4:15 PM CDT	Severe Thunderstorm Warning	HUN	DeKalb	15 min
Apr 21, 4:30 PM CDT	Severe Thunderstorm Warning	HUN	Jackson	15 min
Apr 21, 6:40 PM CDT	Severe Thunderstorm Warning	HUN	DeKalb	35 min
Apr 20, 8:04 PM CDT	Severe Thunderstorm Warning	HUN	Franklin	35 min

Nearby

Severe Thunderstorm Warnings in Alabama, 2006 Every severe thunderstorm warning in 2006

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.