Alert archive / Alabama / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 241, NWS Birmingham, AL

May 10, 2009Chambers County, Lee County, Alabama

NWS Birmingham, AL issued this severe thunderstorm warning at May 10, 2009, 3:15 PM CDT for Chambers County, Lee County, Alabama. It was in force for 30 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 10, 2009, 3:15 PM CDT (20:15 UTC)
Expired: May 10, 2009, 3:45 PM CDT
In force: 30 min
Issued by: NWS Birmingham, AL
Area: Storm-based polygon

Counties Chambers County, AL, Lee County, AL

The nearest sounding before it

Peachtre/Fal Fld, GA (KFFC), launched 12:00Z, 8.3 hours before the alert went out and 106 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: 86 J/kg
Mixed-layer CIN: -166 J/kg
Mixed-layer LCL: 700 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: -8 m²/s²
0-3 km storm-relative helicity: 109 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 May 10, 2:30 PM CDT, 45 minutes earlier.

Area forecast discussion, May 10, 2:30 PM CDT, 45 minutes before

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Hazardous weather outlook, May 10, 1:34 PM CDT, 1 hour 41 minutes before

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In the hours before

Special weather statement, May 10, 12:32 PM CDT, 2 hours 43 minutes before

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Special weather statement, May 10, 1:37 PM CDT, 1 hour 38 minutes before

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Special weather statement, May 10, 1:57 PM CDT, 1 hour 18 minutes before

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Local storm report, May 10, 2:37 PM CDT, 38 minutes before

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Local storm report, May 10, 2:43 PM CDT, 32 minutes before

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Special weather statement, May 10, 2:49 PM CDT, 26 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
May 9, 7:01 PM CDT	Flash Flood Watch	BMX	Blount, Calhoun, Cherokee, Clay, Cleburne, Etowah and 12 more	22 hr
May 10, 10:26 AM CDT	Areal Flood Advisory	BMX	Fayette, Lamar, Marion, Pickens, Walker, Winston	3 hr
May 10, 11:19 AM CDT	Areal Flood Advisory	BMX	Tuscaloosa	3 hr
May 10, 2:03 PM CDT	Areal Flood Advisory	BMX	Chilton, Coosa	3 hr
May 10, 2:22 PM CDT	Areal Flood Advisory	BMX	Autauga, Elmore, Tallapoosa	3 hr
May 10, 2:57 PM CDT	Areal Flood Advisory	BMX	Chambers, Lee, Tallapoosa	3 hr
May 10, 3:40 PM CDT	Areal Flood Advisory	BMX	Lee, Macon	3 hr
May 10, 5:06 PM CDT	Severe Thunderstorm Warning	BMX	Barbour	19 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.