Alert archive / Alabama / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 128, NWS Birmingham, AL

August 12, 2013Greene County, Sumter County, Alabama

NWS Birmingham, AL issued this severe thunderstorm warning at Aug 12, 2013, 8:37 PM CDT for Greene County, Sumter County, Alabama. It was in force for 38 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: Aug 12, 2013, 8:37 PM CDT (01:37 UTC)
Expired: Aug 12, 2013, 9:15 PM CDT
In force: 38 min
Issued by: NWS Birmingham, AL
Area: Storm-based polygon

Counties Greene County, AL, Sumter County, AL

The radar

The Birmingham radar (KBMX), 132 km from the middle of the area, began a volume at 01:37 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 nearest sounding before it

Birmingham, AL (KBMX), launched 00:00Z, 1.6 hours before the alert went out and 131 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: 583 J/kg
Mixed-layer CIN: -55 J/kg
Mixed-layer LCL: 1235 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: 64 m²/s²
0-3 km storm-relative helicity: 78 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 Birmingham, AL wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 12, 6:38 PM CDT, 1 hour 59 minutes earlier.

Area forecast discussion, Aug 12, 6:38 PM CDT, 1 hour 59 minutes before

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Hazardous weather outlook, Aug 12, 7:10 PM CDT, 1 hour 27 minutes before

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In the hours before

Local storm report, Aug 12, 6:50 PM CDT, 1 hour 47 minutes before

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Special weather statement, Aug 12, 8:05 PM CDT, 32 minutes before

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Special weather statement, Aug 12, 8:31 PM CDT, 6 minutes before

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The office that day

Everything else NWS Birmingham, AL issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 12, 8:05 PM CDT	Special Weather Statement	BMX	Sumter	40 min
Aug 12, 8:31 PM CDT	Special Weather Statement	BMX	Greene	44 min
Aug 12, 9:26 PM CDT	Special Weather Statement	BMX	Tuscaloosa	49 min
Aug 12, 11:48 PM CDT	Areal Flood Advisory	BMX	Walker	117 min
Aug 13, 4:28 PM CDT	Special Weather Statement	BMX	Barbour	47 min
Aug 13, 5:53 PM CDT	Areal Flood Advisory	BMX	Coosa	3 hr
Aug 13, 6:16 PM CDT	Special Weather Statement	BMX	Shelby	44 min
Aug 13, 6:18 PM CDT	Flash Flood Warning	BMX	Coosa	3 hr
Aug 13, 6:25 PM CDT	Special Weather Statement	BMX	Chambers, Clay	50 min
Aug 13, 6:38 PM CDT	Areal Flood Advisory	BMX	Jefferson, Shelby	3 hr
Aug 13, 6:50 PM CDT	Areal Flood Advisory	BMX	Bibb	3 hr
Aug 13, 6:55 PM CDT	Areal Flood Advisory	BMX	Clay, Randolph, Talladega	3 hr

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.