Alert archive / Alabama / Special Weather Statements in 2012

Special Weather Statement, NWS Birmingham, AL

August 18, 2012Sumter County, Alabama

NWS Birmingham, AL issued this special weather statement at Aug 18, 2012, 4:58 PM CDT for Sumter County, Alabama. It was in force for 32 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
Aug 18, 2012, 4:58 PM CDT (21:58 UTC)
Expired
Aug 18, 2012, 5:30 PM CDT
In force
32 min
Issued by
NWS Birmingham, AL

County Sumter County, AL

The radar

The Birmingham radar (KBMX), 125 km from the middle of the area, began a volume at 21:58 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

Jackson, MS (KJAN), launched 12:00Z, 10.0 hours before the alert went out and 207 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, Jackson, MS at 12:00Z on 2012-08-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1913 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, Jackson, MS at 12:00Z on 2012-08-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 52 square meters per square second.19395878Sfc1 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
1913 J/kg
Mixed-layer CIN
-49 J/kg
Mixed-layer LCL
828 m above ground
0-6 km bulk shear
19 kt
0-1 km storm-relative helicity
52 m²/s²
0-3 km storm-relative helicity
42 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.2

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 Aug 18, 3:15 PM CDT, 1 hour 43 minutes earlier.

Area forecast discussion, Aug 18, 3:15 PM CDT, 1 hour 43 minutes before
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Hazardous weather outlook, Aug 18, 12:52 PM CDT, 4 hours 6 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE BIRMINGHAM AL
1252 PM CDT SAT AUG 18 2012

ALZ011>015-017>050-191800-
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-
1252 PM CDT SAT AUG 18 2012

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

.DAY ONE...THIS AFTERNOON AND TONIGHT.

ISOLATED SEVERE STORMS ARE POSSIBLE THROUGH 7 PM FOR AREAS ALONG AND
SOUTH OF A LINE FROM GEIGER...TO MOUNDVILLE...TO SELMA LINE.
DAMAGING WINDS WILL BE THE PRIMARY THREAT.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY.

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

ACTIVATION OF STORM SPOTTERS AND EMERGENCY MANAGEMENT ACROSS THE
SOUTHWEST PORTIONS OF CENTRAL ALABAMA.

In the hours before

Local storm report, Aug 18, 11:50 AM CDT, 5 hours 8 minutes before
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Special weather statement, Aug 18, 4:58 PM CDT, 0 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BIRMINGHAM AL
458 PM CDT SAT AUG 18 2012

ALZ030-039-182230-
MARENGO AL-SUMTER AL-
458 PM CDT SAT AUG 18 2012

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN SUMTER AND
NORTHWESTERN MARENGO COUNTIES UNTIL 530 PM CDT...

AT 453 PM CDT...THE NATIONAL WEATHER SERVICE WAS TRACKING A STRONG
THUNDERSTORM NEAR COATOPA...OR 12 MILES WEST OF DEMOPOLIS...MOVING
NORTHEAST AT 10 MPH.

PEA SIZE HAIL AND WIND GUSTS UP TO 40 MPH ARE EXPECTED WITH THIS
STORM.

LOCATIONS IN OR NEAR THE PATH OF THIS STORM INCLUDE...
  DEMOPOLIS...
  DUG HILL...
  US 80 AND AL 28...
  DEMOPOLIS MUNICIPAL AIRPORT...
  MCDOWELL...

&&

LAT...LON 3260 8802 3263 8793 3262 8786 3261 8784
      3260 8784 3259 8786 3261 8788 3260 8790
      3253 8786 3255 8784 3254 8782 3252 8782
      3252 8773 3249 8773 3233 8804 3247 8817
TIME...MOT...LOC 2158Z 233DEG 10KT 3246 8802

GRANTHAM

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 18, 4:34 AM CDTSpecial Weather StatementBMXPickens56 min
Aug 18, 5:04 AM CDTSevere Thunderstorm WarningBMXPickens26 min
Aug 18, 5:14 AM CDTSpecial Weather StatementBMXGreene, Sumter46 min
Aug 18, 5:27 AM CDTSevere Thunderstorm WarningBMXGreene, Hale, Pickens, Tuscaloosa48 min
Aug 18, 6:08 AM CDTSevere Thunderstorm WarningBMXBibb, Hale, Tuscaloosa52 min
Aug 18, 6:48 AM CDTSevere Thunderstorm WarningBMXBibb, Chilton, Shelby24 min
Aug 18, 8:01 AM CDTSpecial Weather StatementBMXAutauga, Coosa, Elmore44 min
Aug 18, 5:44 PM CDTSpecial Weather StatementBMXMarengo46 min
Aug 18, 6:07 PM CDTAreal Flood AdvisoryBMXWinston4 hr
Aug 18, 6:18 PM CDTSpecial Weather StatementBMXDallas, Perry57 min
Aug 18, 6:34 PM CDTSpecial Weather StatementBMXBibb56 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.