Alert archive / Alabama / Severe Thunderstorm Warnings in 2010

Severe Thunderstorm Warning 293, NWS Birmingham, AL

October 24, 2010Blount County, Jefferson County, St. Clair County, Alabama

NWS Birmingham, AL issued this severe thunderstorm warning at Oct 24, 2010, 10:59 PM CDT for Blount County, Jefferson County, St. Clair County, Alabama. It was in force for 46 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: Oct 24, 2010, 10:59 PM CDT (03:59 UTC)
Expired: Oct 24, 2010, 11:45 PM CDT
In force: 46 min
Issued by: NWS Birmingham, AL
Area: Storm-based polygon

Counties Blount County, AL, Jefferson County, AL, St. Clair County, AL

The radar

The Birmingham radar (KBMX), 66 km from the middle of the area, began a volume at 03:59 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
Oct 24, 8:46 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Birmingham, AL (KBMX), launched 00:00Z, 4.0 hours before the alert went out and 66 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: 65 J/kg
Mixed-layer CIN: -43 J/kg
Mixed-layer LCL: 1728 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 117 m²/s²
0-3 km storm-relative helicity: 232 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

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 Oct 24, 9:04 PM CDT, 1 hour 55 minutes earlier.

Area forecast discussion, Oct 24, 9:04 PM CDT, 1 hour 55 minutes before

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Hazardous weather outlook, Oct 24, 9:15 PM CDT, 1 hour 44 minutes before

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In the hours before

Special weather statement, Oct 24, 9:29 PM CDT, 1 hour 30 minutes before

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Local storm report, Oct 24, 9:31 PM CDT, 1 hour 28 minutes before

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Special weather statement, Oct 24, 10:21 PM CDT, 38 minutes before

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Special weather statement, Oct 24, 10:27 PM CDT, 32 minutes before

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Special weather statement, Oct 24, 10:29 PM CDT, 30 minutes before

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Local storm report, Oct 24, 10:53 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
Oct 24, 7:19 PM CDT	Severe Thunderstorm Warning	BMX	Bibb, Jefferson, Shelby	41 min
Oct 24, 7:27 PM CDT	Severe Thunderstorm Warning	BMX	Marengo	48 min
Oct 24, 7:52 PM CDT	Severe Thunderstorm Warning	BMX	Hale, Marengo, Perry	38 min
Oct 24, 7:53 PM CDT	Severe Thunderstorm Warning	BMX	Jefferson, Shelby	52 min
Oct 24, 8:38 PM CDT	Severe Thunderstorm Warning	BMX	Marengo	38 min
Oct 24, 8:43 PM CDT	Severe Thunderstorm Warning	BMX	Blount	36 min
Oct 24, 8:47 PM CDT	Severe Thunderstorm Warning	BMX	Bibb, Hale, Jefferson, Tuscaloosa	43 min
Oct 24, 9:45 PM CDT	Severe Thunderstorm Warning	BMX	Chilton, Coosa, Shelby, Talladega	30 min
Oct 24, 10:23 PM CDT	Severe Thunderstorm Warning	BMX	Jefferson, Tuscaloosa, Walker	52 min
Oct 24, 10:36 PM CDT	Severe Thunderstorm Warning	BMX	Blount	24 min
Oct 24, 10:37 PM CDT	Severe Thunderstorm Warning	BMX	Marion	38 min
Oct 24, 10:55 PM CDT	Severe Thunderstorm Warning	BMX	Jefferson	29 min
Oct 25, 1:20 AM CDT	Severe Thunderstorm Warning	BMX	Lamar, Marion	25 min
Oct 25, 1:34 AM CDT	Severe Thunderstorm Warning	BMX	Fayette, Greene, Lamar, Pickens	41 min
Oct 25, 1:44 AM CDT	Severe Thunderstorm Warning	BMX	Fayette, Lamar, Marion, Walker, Winston	31 min
Oct 25, 2:09 AM CDT	Severe Thunderstorm Warning	BMX	Greene, Pickens, Sumter	51 min
Oct 25, 2:14 AM CDT	Severe Thunderstorm Warning	BMX	Walker, Winston	46 min
Oct 25, 3:00 AM CDT	Severe Thunderstorm Warning	BMX	Bibb, Blount, Hale, Jefferson, Shelby, Tuscaloosa and 1 more	45 min
Oct 25, 3:04 AM CDT	Severe Thunderstorm Warning	BMX	Blount	41 min
Oct 25, 3:23 AM CDT	Severe Thunderstorm Warning	BMX	Bibb, Chilton, Dallas, Hale, Marengo, Perry	52 min
Oct 25, 3:42 AM CDT	Severe Thunderstorm Warning	BMX	Bibb, Blount, Chilton, Etowah, Jefferson, St. Clair and 2 more	48 min
Oct 25, 4:08 AM CDT	Severe Thunderstorm Warning	BMX	Autauga, Bibb, Chilton, Dallas, Perry	52 min
Oct 25, 4:15 AM CDT	Severe Thunderstorm Warning	BMX	Bibb, Calhoun, Cherokee, Chilton, Etowah, St. Clair and 2 more	45 min
Oct 25, 4:42 AM CDT	Severe Thunderstorm Warning	BMX	Calhoun, Cherokee, Clay, Cleburne, Randolph, Talladega	48 min
Oct 25, 5:28 AM CDT	Severe Thunderstorm Warning	BMX	Clay, Cleburne, Randolph	47 min
Oct 25, 6:39 AM CDT	Severe Thunderstorm Warning	BMX	Lowndes, Montgomery	51 min

Nearby

Severe Thunderstorm Warnings in Alabama, 2010 Every severe thunderstorm warning in 2010

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.