Alert archive / Alabama / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 76, NWS Huntsville, AL

June 27, 2013DeKalb County, Jackson County, Marshall County, Alabama

NWS Huntsville, AL issued this severe thunderstorm warning at Jun 27, 2013, 7:47 AM CDT for DeKalb County, Jackson County, Marshall County, Alabama. It was in force for 28 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 27, 2013, 7:47 AM CDT (12:47 UTC)
Expired: Jun 27, 2013, 8:15 AM CDT
In force: 28 min
Issued by: NWS Huntsville, AL
Area: Storm-based polygon

Counties DeKalb County, AL, Jackson County, AL, Marshall County, AL

The radar

The Northeast Alabama radar (KHTX), 44 km from the middle of the area, began a volume at 12:46 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, 0.8 hours before the alert went out and 166 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: 2646 J/kg
Mixed-layer CIN: -23 J/kg
Mixed-layer LCL: 696 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 201 m²/s²
0-3 km storm-relative helicity: 196 m²/s²
Significant tornado parameter: 2.7
Supercell composite: 15.4

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 27, 6:07 AM CDT, 1 hour 40 minutes earlier.

Area forecast discussion, Jun 27, 6:07 AM CDT, 1 hour 40 minutes before

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Hazardous weather outlook, Jun 27, 3:25 AM CDT, 4 hours 22 minutes before

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In the hours before

Special weather statement, Jun 27, 4:47 AM CDT, 3 hours before

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Special weather statement, Jun 27, 5:17 AM CDT, 2 hours 30 minutes before

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Special weather statement, Jun 27, 6:31 AM CDT, 1 hour 16 minutes before

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Special weather statement, Jun 27, 7:02 AM CDT, 45 minutes before

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Special weather statement, Jun 27, 7:04 AM CDT, 43 minutes before

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Special weather statement, Jun 27, 7:38 AM CDT, 9 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 27, 2:24 AM CDT	Special Weather Statement	HUN	Madison	51 min
Jun 27, 2:49 AM CDT	Special Weather Statement	HUN	Lawrence	26 min
Jun 27, 3:01 AM CDT	Special Weather Statement	HUN	Colbert, Lauderdale	29 min
Jun 27, 3:08 AM CDT	Special Weather Statement	HUN	Jackson	37 min
Jun 27, 3:20 AM CDT	Special Weather Statement	HUN	Lawrence, Limestone, Morgan	25 min
Jun 27, 3:32 AM CDT	Special Weather Statement	HUN	Lawrence	28 min
Jun 27, 3:39 AM CDT	Special Weather Statement	HUN	DeKalb	36 min
Jun 27, 3:47 AM CDT	Special Weather Statement	HUN	Cullman, Madison, Morgan	28 min
Jun 27, 4:06 AM CDT	Special Weather Statement	HUN	Lawrence	39 min
Jun 27, 4:17 AM CDT	Special Weather Statement	HUN	Cullman, Marshall	28 min
Jun 27, 4:47 AM CDT	Special Weather Statement	HUN	Cullman	28 min
Jun 27, 5:17 AM CDT	Special Weather Statement	HUN	Cullman	28 min
Jun 27, 6:31 AM CDT	Special Weather Statement	HUN	Madison	29 min
Jun 27, 7:02 AM CDT	Special Weather Statement	HUN	Madison	43 min
Jun 27, 7:38 AM CDT	Special Weather Statement	HUN	Marshall	22 min
Jun 27, 8:14 AM CDT	Severe Thunderstorm Warning	HUN	DeKalb, Jackson, Marshall	31 min
Jun 27, 8:46 AM CDT	Special Weather Statement	HUN	DeKalb	29 min
Jun 27, 7:04 AM CDT	Special Weather Statement	HUN	Franklin	41 min

Nearby

Severe Thunderstorm Warnings in Alabama, 2013 Every severe thunderstorm warning in 2013

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.