Alert archive / Alabama / Special Weather Statements in 2012

Special Weather Statement, NWS Birmingham, AL

March 23, 2012St. Clair County, Alabama

NWS Birmingham, AL issued this special weather statement at Mar 23, 2012, 11:01 AM CDT for St. Clair County, Alabama. It was in force for 59 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Mar 23, 2012, 11:01 AM CDT (16:01 UTC)
Expired: Mar 23, 2012, 12:00 PM CDT
In force: 59 min
Issued by: NWS Birmingham, AL

County St. Clair County, AL

The radar

The Birmingham radar (KBMX), 94 km from the middle of the area, began a volume at 16:04 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 12:00Z, 4.0 hours before the alert went out and 94 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: 490 J/kg
Mixed-layer CIN: -7 J/kg
Mixed-layer LCL: 500 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 176 m²/s²
0-3 km storm-relative helicity: 225 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 3.1

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at Mar 23, 10:36 AM CDT, 25 minutes earlier.

Area forecast discussion, Mar 23, 10:36 AM CDT, 25 minutes before

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Hazardous weather outlook, Mar 23, 6:46 AM CDT, 4 hours 15 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE BIRMINGHAM AL
646 AM CDT FRI MAR 23 2012

ALZ011>015-017>050-241145-
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-
646 AM CDT FRI MAR 23 2012

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

.DAY ONE...TODAY AND TONIGHT.

SEVERE THUNDERSTORMS ARE POSSIBLE TODAY...ROUGHLY ALONG AND EAST
OF A LINE FROM GADSDEN TO CLANTON TO SELMA. THE BEST CHANCE FOR
SEVERE THUNDERSTORMS WILL BE FROM 10 AM UNTIL 8 PM. THE MAIN THREATS
WILL BE DAMAGING WINDS...LARGE HAIL...AND LOCALIZED FLOODING DUE TO
HEAVY RAINFALL.

IN ADDITION...MINOR RIVER FLOODING IS POSSIBLE ON THE SUCARNOOCHEE
AND TOMBIGBEE RIVERS IN SOUTHWEST CENTRAL ALABAMA. PLEASE REFER
TO OUR RIVER FLOOD PRODUCTS FOR MORE INFORMATION.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY.

MINOR RIVER FLOODING IS POSSIBLE ON THE SUCARNOOCHEE AND TOMBIGBEE
RIVERS IN SOUTHWEST CENTRAL ALABAMA THROUGH SUNDAY. PLEASE REFER
TO OUR RIVER FLOOD PRODUCTS FOR MORE INFORMATION.

.SPOTTER INFORMATION STATEMENT...

ACTIVATION OF STORM SPOTTERS AND EMERGENCY MANAGEMENT MAY BE
NEEDED TODAY.

In the hours before

Local storm report, Mar 23, 9:57 AM CDT, 1 hour 4 minutes before

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Special weather statement, Mar 23, 10:17 AM CDT, 44 minutes before

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Special weather statement, Mar 23, 10:30 AM CDT, 31 minutes before

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Special weather statement, Mar 23, 10:35 AM CDT, 26 minutes before

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Special weather statement, Mar 23, 10:56 AM CDT, 5 minutes before

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Special weather statement, Mar 23, 11:01 AM CDT, 0 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
Mar 22, 7:03 PM CDT	Areal Flood Advisory	BMX	Marengo	3 hr
Mar 22, 8:31 PM CDT	Areal Flood Warning	BMX	Marengo	3 hr
Mar 22, 10:44 PM CDT	Areal Flood Advisory	BMX	Dallas, Perry	2 hr
Mar 23, 3:18 AM CDT	Special Weather Statement	BMX	Autauga	27 min
Mar 23, 6:16 AM CDT	Areal Flood Advisory	BMX	Autauga, Dallas, Lowndes	3 hr
Mar 23, 6:24 AM CDT	Flash Flood Warning	BMX	Sumter	3 hr
Mar 23, 6:39 AM CDT	Areal Flood Advisory	BMX	Greene, Pickens	3 hr
Mar 23, 7:46 AM CDT	Special Weather Statement	BMX	Tuscaloosa	44 min
Mar 23, 8:20 AM CDT	Special Weather Statement	BMX	Montgomery, Pike	40 min
Mar 23, 8:54 AM CDT	Areal Flood Warning	BMX	Lowndes	3 hr
Mar 23, 8:59 AM CDT	Tornado Warning	BMX	Pike	31 min
Mar 23, 9:28 AM CDT	Areal Flood Warning	BMX	Sumter	3 hr
Mar 23, 9:29 AM CDT	Tornado Warning	BMX	Pike	31 min
Mar 23, 10:04 AM CDT	Tornado Warning	BMX	Pike	26 min
Mar 23, 10:17 AM CDT	Special Weather Statement	BMX	Barbour, Bullock	43 min
Mar 23, 10:30 AM CDT	Special Weather Statement	BMX	Pike	30 min
Mar 23, 10:35 AM CDT	Special Weather Statement	BMX	St. Clair	25 min
Mar 23, 10:53 AM CDT	Flash Flood Warning	BMX	Pike	3 hr
Mar 23, 10:55 AM CDT	Areal Flood Advisory	BMX	Jefferson, St. Clair, Shelby	2 hr
Mar 23, 10:56 AM CDT	Special Weather Statement	BMX	Barbour	64 min
Mar 23, 11:27 AM CDT	Flash Flood Warning	BMX	St. Clair	3 hr
Mar 23, 11:52 AM CDT	Areal Flood Advisory	BMX	Calhoun, Etowah	3 hr
Mar 23, 12:22 PM CDT	Areal Flood Advisory	BMX	Barbour, Bullock	3 hr
Mar 23, 1:36 PM CDT	Areal Flood Advisory	BMX	Calhoun, Cherokee	3 hr
Mar 23, 4:02 PM CDT	Severe Thunderstorm Warning	BMX	Elmore	28 min
Mar 23, 4:28 PM CDT	Special Weather Statement	BMX	Elmore	47 min
Mar 23, 5:13 PM CDT	Special Weather Statement	BMX	Tallapoosa	47 min

Nearby

Special Weather Statements in Alabama, 2012 Every special weather statement in 2012

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.