Alert archive / Alabama / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 155, NWS Huntsville, AL

May 27, 2009Colbert County, Lauderdale County, Lawrence County, Alabama

NWS Huntsville, AL issued this severe thunderstorm warning at May 27, 2009, 10:22 PM CDT for Colbert County, Lauderdale County, Lawrence 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: May 27, 2009, 10:22 PM CDT (03:22 UTC)
Expired: May 27, 2009, 10:46 PM CDT
In force: 24 min
Issued by: NWS Huntsville, AL
Area: Storm-based polygon

Counties Colbert County, AL, Lauderdale County, AL, Lawrence County, AL

The radar

The Columbus AFB radar (KGWX), 113 km from the middle of the area, began a volume at 03:23 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

Little Rock, AR (KLZK), launched 00:00Z, 3.4 hours before the alert went out and 216 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: 262 J/kg
Mixed-layer CIN: -14 J/kg
Mixed-layer LCL: 739 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 7 m²/s²
0-3 km storm-relative helicity: 81 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 1.5

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 May 27, 6:20 PM CDT, 4 hours 2 minutes earlier.

Area forecast discussion, May 27, 6:20 PM CDT, 4 hours 2 minutes before

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Hazardous weather outlook, May 27, 6:15 PM CDT, 4 hours 7 minutes before

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In the hours before

Local storm report, May 27, 6:13 PM CDT, 4 hours 9 minutes before

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Local storm report, May 27, 6:29 PM CDT, 3 hours 53 minutes before

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Local storm report, May 27, 6:32 PM CDT, 3 hours 50 minutes before

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Local storm report, May 27, 6:33 PM CDT, 3 hours 49 minutes before

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Local storm report, May 27, 6:44 PM CDT, 3 hours 38 minutes before

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Special weather statement, May 27, 6:48 PM CDT, 3 hours 34 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
May 27, 7:01 PM CDT	Severe Thunderstorm Warning	HUN	Morgan	44 min
May 27, 9:46 PM CDT	Severe Thunderstorm Warning	HUN	Colbert, Lauderdale	44 min

Nearby

Severe Thunderstorm Warnings in Alabama, 2009 Every severe thunderstorm warning in 2009

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.