Alert archive / Alabama / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 442, NWS Birmingham, AL

December 8, 2009Greene County, Pickens County, Sumter County, Alabama

NWS Birmingham, AL issued this severe thunderstorm warning at Dec 8, 2009, 7:56 PM CST for Greene County, Pickens County, Sumter County, Alabama. It was in force for 49 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: Dec 8, 2009, 7:56 PM CST (01:56 UTC)
Expired: Dec 8, 2009, 8:45 PM CST
In force: 49 min
Issued by: NWS Birmingham, AL
Area: Storm-based polygon

Counties Greene County, AL, Pickens County, AL, Sumter County, AL

The radar

The Columbus AFB radar (KGWX), 112 km from the middle of the area, began a volume at 01:55 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
Dec 8, 6:12 PM CST	Tornado Watch	SPC	8 hr

The nearest sounding before it

Birmingham, AL (KBMX), launched 00:00Z, 1.9 hours before the alert went out and 125 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: 11 J/kg
Mixed-layer CIN: -328 J/kg
Mixed-layer LCL: 495 m above ground
0-6 km bulk shear: 55 kt
0-1 km storm-relative helicity: 644 m²/s²
0-3 km storm-relative helicity: 840 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 4.2

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 Dec 8, 6:41 PM CST, 1 hour 15 minutes earlier.

Area forecast discussion, Dec 8, 6:41 PM CST, 1 hour 15 minutes before

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Hazardous weather outlook, Dec 8, 7:02 PM CST, 54 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
Dec 8, 6:05 PM CST	Flash Flood Warning	BMX	Lamar	9 hr
Dec 8, 7:58 PM CST	Areal Flood Advisory	BMX	Fayette	3 hr
Dec 8, 8:56 PM CST	Flash Flood Warning	BMX	Fayette, Marion, Walker, Winston	6 hr
Dec 8, 9:19 PM CST	Tornado Warning	BMX	Pickens	41 min
Dec 8, 9:44 PM CST	Tornado Warning	BMX	Pickens, Tuscaloosa	46 min
Dec 8, 9:51 PM CST	Tornado Warning	BMX	Pickens	24 min
Dec 8, 10:08 PM CST	Severe Thunderstorm Warning	BMX	Fayette, Pickens, Tuscaloosa	37 min
Dec 8, 10:22 PM CST	Severe Thunderstorm Warning	BMX	Jefferson, Walker	33 min
Dec 8, 10:37 PM CST	Severe Thunderstorm Warning	BMX	Blount, Jefferson	38 min
Dec 8, 11:14 PM CST	Tornado Warning	BMX	Blount, Etowah, St. Clair	22 min
Dec 8, 11:18 PM CST	Severe Thunderstorm Warning	BMX	Fayette, Lamar, Marion	42 min
Dec 8, 11:29 PM CST	Severe Thunderstorm Warning	BMX	Greene, Hale, Sumter	61 min
Dec 9, 12:05 AM CST	Severe Thunderstorm Warning	BMX	Bibb, Greene, Hale, Perry, Sumter, Tuscaloosa	40 min
Dec 9, 12:09 AM CST	Severe Thunderstorm Warning	BMX	Blount, Jefferson, St. Clair	51 min
Dec 9, 12:23 AM CST	Severe Thunderstorm Warning	BMX	Bibb, Chilton, Coosa, Hale, Marengo, Perry and 1 more	52 min
Dec 9, 12:25 AM CST	Areal Flood Advisory	BMX	Bibb, Blount, Calhoun, Cherokee, Chilton, Coosa and 6 more	3 hr
Dec 9, 1:05 AM CST	Severe Thunderstorm Warning	BMX	Chilton, Clay, Coosa, Shelby, Talladega	40 min
Dec 9, 1:11 AM CST	Severe Thunderstorm Warning	BMX	Autauga, Chilton, Coosa, Elmore	49 min
Dec 9, 1:30 AM CST	Flash Flood Warning	BMX	Clay, Talladega	90 min
Dec 9, 1:37 AM CST	Severe Thunderstorm Warning	BMX	Clay, Cleburne, Randolph	38 min
Dec 9, 2:01 AM CST	Severe Thunderstorm Warning	BMX	Chambers, Randolph, Tallapoosa	44 min
Dec 9, 4:16 AM CST	Wind Advisory	BMX	Autauga, Barbour, Bibb, Blount, Bullock, Calhoun and 33 more	13 hr
Dec 9, 6:41 AM CST	River Flood Warning	BMX	Greene, Hale, Marengo, Pickens, Sumter	51 hr
Dec 9, 8:53 AM CST	River Flood Warning	BMX	Greene, Hale, Marengo	3 days
Dec 9, 9:38 AM CST	Areal Flood Warning	BMX	Lamar	24 hr

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.