Alert archive / Alabama / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 121, NWS Birmingham, AL

April 10, 2009Etowah County, St. Clair County, Alabama

NWS Birmingham, AL issued this severe thunderstorm warning at Apr 10, 2009, 6:02 AM CDT for Etowah County, St. Clair County, Alabama. It was in force for 28 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: Apr 10, 2009, 6:02 AM CDT (11:02 UTC)
Expired: Apr 10, 2009, 6:30 AM CDT
In force: 28 min
Issued by: NWS Birmingham, AL
Area: Storm-based polygon

Counties Etowah County, AL, St. Clair County, AL

The radar

The Birmingham radar (KBMX), 96 km from the middle of the area, began a volume at 11:03 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

Peachtre/Fal Fld, GA (KFFC), launched 00:00Z, 11.0 hours before the alert went out and 165 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 2758 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 80 m²/s²
0-3 km storm-relative helicity: 144 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 Apr 10, 3:45 AM CDT, 2 hours 17 minutes earlier.

Area forecast discussion, Apr 10, 3:45 AM CDT, 2 hours 17 minutes before

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Hazardous weather outlook, Apr 10, 2:48 AM CDT, 3 hours 14 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE BIRMINGHAM AL
248 AM CDT FRI APR 10 2009

ALZ011>015-017>050-101300-
AUTAUGA-BARBOUR-BIBB-BLOUNT-BULLOCK-CALHOUN-CHAMBERS-CHEROKEE-
CHILTON-CLAY-CLEBURNE-COOSA-DALLAS-ELMORE-ETOWAH-FAYETTE-GREENE-HALE-
JEFFERSON-LAMAR-LEE-LOWNDES-MACON-MARENGO-MARION-MONTGOMERY-PERRY-
PICKENS-PIKE-RANDOLPH-RUSSELL-SHELBY-ST CLAIR-SUMTER-TALLADEGA-
TALLAPOOSA-TUSCALOOSA-WALKER-WINSTON-
248 AM CDT FRI APR 10 2009

THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE COUNTIES SERVED BY THE
NATIONAL WEATHER SERVICE OFFICE IN BIRMINGHAM.

.DAY ONE...REMAINDER OF TONIGHT.

SEVERE THUNDERSTORMS ARE POSSIBLE FOR AREAS NORTH OF I-20 AND WEST
OF I-65. THE PRIMARY THREAT WILL BE LARGE HAIL...BUT AN ISOLATED
TORNADO CANNOT BE RULED OUT.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY.

SEVERE THUNDERSTORMS ARE POSSIBLE ACROSS CENTRAL ALABAMA ON FRIDAY...
BETWEEN 12 NOON AND 10 PM.  THE PRIMARY THREATS WILL BE LARGE
HAIL AND STRAIGHT LINE WINDS....BUT AN ISOLATED TORNADO CANNOT BE
RULED OUT ALONG AND NORTH OF I-20.

SEVERE THUNDERSTORMS ARE POSSIBLE AGAIN ON MONDAY...AS A COLD FRONT
PUSHES THROUGH THE AREA.

.SPOTTER INFORMATION STATEMENT...

ACTIVATION OF STORM SPOTTERS AND EMERGENCY MANAGEMENT WILL LIKELY
BE NEEDED TODAY AND POSSIBLY AGAIN ON MONDAY.

In the hours before

Local storm report, Apr 10, 3:54 AM CDT, 2 hours 8 minutes before

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Local storm report, Apr 10, 4:23 AM CDT, 1 hour 39 minutes before

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Local storm report, Apr 10, 4:51 AM CDT, 1 hour 11 minutes before

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Local storm report, Apr 10, 4:53 AM CDT, 1 hour 9 minutes before

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Local storm report, Apr 10, 4:56 AM CDT, 1 hour 6 minutes before

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Local storm report, Apr 10, 5:07 AM CDT, 55 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
Apr 10, 3:20 AM CDT	Severe Thunderstorm Warning	BMX	Lamar	40 min
Apr 10, 3:50 AM CDT	Severe Thunderstorm Warning	BMX	Fayette, Lamar, Marion, Walker, Winston	40 min
Apr 10, 4:00 AM CDT	Severe Thunderstorm Warning	BMX	Fayette, Lamar	45 min
Apr 10, 4:25 AM CDT	Severe Thunderstorm Warning	BMX	Fayette, Marion, Walker, Winston	35 min
Apr 10, 4:46 AM CDT	Severe Thunderstorm Warning	BMX	Fayette, Walker	44 min
Apr 10, 5:40 AM CDT	Lake Wind Advisory	BMX	Autauga, Barbour, Bibb, Blount, Bullock, Calhoun and 33 more	7 hr
Apr 10, 6:21 AM CDT	Severe Thunderstorm Warning	BMX	Calhoun, Cherokee, Cleburne, Etowah	24 min
Apr 10, 12:35 PM CDT	Wind Advisory	BMX	Autauga, Barbour, Bibb, Blount, Bullock, Calhoun and 33 more	6 hr
Apr 10, 1:45 PM CDT	Severe Thunderstorm Warning	BMX	Marion	45 min
Apr 10, 2:09 PM CDT	Severe Thunderstorm Warning	BMX	Marion, Winston	51 min
Apr 10, 2:44 PM CDT	Severe Thunderstorm Warning	BMX	Winston	16 min
Apr 10, 3:06 PM CDT	Severe Thunderstorm Warning	BMX	Winston	34 min
Apr 10, 3:18 PM CDT	Severe Thunderstorm Warning	BMX	St. Clair, Shelby, Talladega	24 min
Apr 10, 3:30 PM CDT	Severe Thunderstorm Warning	BMX	Jefferson, St. Clair, Shelby	30 min
Apr 10, 3:48 PM CDT	Severe Thunderstorm Warning	BMX	Cherokee	42 min
Apr 10, 3:49 PM CDT	Severe Thunderstorm Warning	BMX	St. Clair, Shelby, Talladega	41 min
Apr 10, 4:08 PM CDT	Severe Thunderstorm Warning	BMX	Blount, Etowah	52 min
Apr 10, 4:11 PM CDT	Severe Thunderstorm Warning	BMX	Blount, Calhoun, Cherokee, Etowah, St. Clair	34 min
Apr 10, 4:11 PM CDT	Tornado Warning	BMX	Blount, Etowah	34 min
Apr 10, 4:15 PM CDT	Tornado Warning	BMX	Cherokee	45 min
Apr 10, 4:28 PM CDT	Severe Thunderstorm Warning	BMX	Calhoun, Clay, Cleburne, Randolph, St. Clair, Talladega	47 min
Apr 10, 4:29 PM CDT	Severe Thunderstorm Warning	BMX	Walker, Winston	20 min
Apr 10, 4:31 PM CDT	Severe Thunderstorm Warning	BMX	Blount, Jefferson	44 min
Apr 10, 4:35 PM CDT	Tornado Warning	BMX	Calhoun, Clay, Cleburne, Randolph, Talladega	40 min
Apr 10, 4:42 PM CDT	Tornado Warning	BMX	Cherokee, Etowah	48 min
Apr 10, 4:43 PM CDT	Severe Thunderstorm Warning	BMX	Bibb, Jefferson, Shelby, Talladega	47 min
Apr 10, 4:57 PM CDT	Severe Thunderstorm Warning	BMX	Bibb, Chilton, Jefferson, Shelby, Tuscaloosa	48 min
Apr 10, 5:01 PM CDT	Severe Thunderstorm Warning	BMX	Clay, St. Clair, Shelby, Talladega	44 min
Apr 10, 5:04 PM CDT	Severe Thunderstorm Warning	BMX	Clay, Cleburne, Randolph	41 min
Apr 10, 5:09 PM CDT	Tornado Warning	BMX	Clay, Cleburne, Randolph	29 min
Apr 10, 5:12 PM CDT	Severe Thunderstorm Warning	BMX	Calhoun, Cherokee, Cleburne, Etowah	48 min
Apr 10, 5:29 PM CDT	Severe Thunderstorm Warning	BMX	Calhoun, Cherokee, Cleburne, Etowah, St. Clair	61 min
Apr 10, 5:34 PM CDT	Severe Thunderstorm Warning	BMX	Shelby, Talladega	41 min
Apr 10, 5:37 PM CDT	Severe Thunderstorm Warning	BMX	Calhoun, Cherokee, Cleburne, Etowah, St. Clair	23 min
Apr 10, 5:38 PM CDT	Tornado Warning	BMX	Calhoun, Cherokee, Cleburne, Etowah	52 min
Apr 10, 5:44 PM CDT	Severe Thunderstorm Warning	BMX	Chilton, Clay, Coosa, Shelby, Talladega, Tallapoosa	46 min
Apr 10, 5:45 PM CDT	Tornado Warning	BMX	Calhoun, Cleburne, Etowah, St. Clair	60 min
Apr 10, 5:50 PM CDT	Severe Thunderstorm Warning	BMX	Bibb, Chilton, Shelby	21 min
Apr 10, 6:00 PM CDT	Severe Thunderstorm Warning	BMX	Clay, Cleburne, Randolph, Shelby, Talladega	60 min
Apr 10, 6:02 PM CDT	Tornado Warning	BMX	Chilton, Coosa, Tallapoosa	58 min
Apr 10, 6:15 PM CDT	Severe Thunderstorm Warning	BMX	Chambers, Clay, Coosa, Randolph, Talladega, Tallapoosa	60 min
Apr 10, 6:24 PM CDT	Severe Thunderstorm Warning	BMX	Bibb, Chilton, Coosa, Perry	51 min
Apr 10, 6:32 PM CDT	Tornado Warning	BMX	Coosa, Elmore, Tallapoosa	28 min
Apr 10, 6:55 PM CDT	Tornado Warning	BMX	Chambers, Elmore, Lee, Tallapoosa	65 min
Apr 10, 6:57 PM CDT	Severe Thunderstorm Warning	BMX	Chilton, Coosa, Elmore, Tallapoosa	63 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.