Alert archive / Alabama / Special Weather Statements in 2012

Special Weather Statement, NWS Birmingham, AL

September 2, 2012Marion County, Winston County, Alabama

NWS Birmingham, AL issued this special weather statement at Sep 2, 2012, 5:58 PM CDT for Marion County, Winston County, Alabama. It was in force for 47 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
Sep 2, 2012, 5:58 PM CDT (22:58 UTC)
Expired
Sep 2, 2012, 6:45 PM CDT
In force
47 min
Issued by
NWS Birmingham, AL

Counties Marion County, AL, Winston County, AL

The radar

The Columbus AFB radar (KGWX), 58 km from the middle of the area, began a volume at 23:00 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, 11.0 hours before the alert went out and 132 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-pSkew-T log-p diagram, Birmingham, AL at 12:00Z on 2012-09-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1480 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Birmingham, AL at 12:00Z on 2012-09-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 94 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
1480 J/kg
Mixed-layer CIN
-11 J/kg
Mixed-layer LCL
519 m above ground
0-6 km bulk shear
19 kt
0-1 km storm-relative helicity
94 m²/s²
0-3 km storm-relative helicity
100 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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 Sep 2, 3:28 PM CDT, 2 hours 30 minutes earlier.

Area forecast discussion, Sep 2, 3:28 PM CDT, 2 hours 30 minutes before
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Hazardous weather outlook, Sep 2, 5:44 PM CDT, 14 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE BIRMINGHAM AL
544 PM CDT SUN SEP 2 2012

ALZ011>015-017>050-031200-
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-
544 PM CDT SUN SEP 2 2012

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

.DAY ONE...TONIGHT.

SEVERE THUNDERSTORMS ARE LIKELY THROUGH 11 PM ALONG AND NORTH OF A
LINE FROM MILLPORT...TO BIRMINGHAM...TO HEFLIN. DAMAGING WINDS ARE
THE PRIMARY THREAT. HOWEVER...ISOLATED TORNADOES ARE POSSIBLE...BUT
THE THREAT FOR TORNADOES SHOULD DIMINISH BY 8 PM.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY.

SEVERE THUNDERSTORMS WILL BE POSSIBLE ON MONDAY ACROSS CENTRAL
ALABAMA...PRIMARILY DURING THE AFTERNOON AND EVENING HOURS. DAMAGING
WINDS ARE THE PRIMARY THREAT. CLOUD COVER MONDAY MORNING COULD
LIMIT INSTABILITIES AND THUNDERSTORM DEVELOPMENT...RESULTING IN A
LOWER CONFIDENCE IN SEVERE POTENTIAL.

.SPOTTER INFORMATION STATEMENT...

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

In the hours before

Special weather statement, Sep 2, 5:16 PM CDT, 42 minutes before
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Special weather statement, Sep 2, 5:58 PM CDT, 0 minutes before
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The office that day

Everything else NWS Birmingham, AL issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Sep 2, 5:16 PM CDTSpecial Weather StatementBMXMarion, Winston44 min
Sep 2, 6:40 PM CDTSpecial Weather StatementBMXMarion50 min
Sep 2, 6:45 PM CDTSpecial Weather StatementBMXMarion, Winston45 min

Nearby

Special Weather Statements in Alabama, 2012Every 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.