Alert archive / Alabama / Special Weather Statements in 2012

Special Weather Statement, NWS Birmingham, AL

December 20, 20124 counties in Alabama

NWS Birmingham, AL issued this special weather statement at Dec 20, 2012, 10:13 AM CST for 4 counties in Alabama. It was in force for 47 min. 4 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued
Dec 20, 2012, 10:13 AM CST (16:13 UTC)
Expired
Dec 20, 2012, 11:00 AM CST
In force
47 min
Issued by
NWS Birmingham, AL

Counties Autauga County, AL, Elmore County, AL, Lowndes County, AL, Montgomery County, AL

What was reported inside it

TimeReportWhereRemark
Dec 20, 10:33 AM CSTTSTM WND DMG3 Ene Titus, ALTREES DOWN ACROSS BUYCK ROAD, 2 MILES NORTH OF HWY 231.
Dec 20, 10:44 AM CSTTSTM WND DMG4 N Wetumpka, ALTREES AND POWER LINES DOWN ACROSS BRIER ROAD AT THE INTERSECTION OF WEOKA ROAD.
Dec 20, 11:05 AM CSTTSTM WND DMG4 Ne Emerald Mountain, ALA LARGE TREE FELL ACROSS WARE RD NEAR FRIENDSHIP. CREWS WERE DISPATCHED TO CLEAR THE ROADWAY.
Dec 20, 11:05 AM CSTTSTM WND DMGPike Road, ALTREES REPORTED DOWN IN THE PIKE ROAD COMMUNITY.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Birmingham, AL (KBMX), launched 12:00Z, 4.2 hours before the alert went out and 101 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 2012-12-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 2012-12-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 574 square meters per square second.1939587897Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
512 m above ground
0-6 km bulk shear
52 kt
0-1 km storm-relative helicity
574 m²/s²
0-3 km storm-relative helicity
705 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.7

Open this sounding in Storm Lab

The text

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

742 
WWUS84 KBMX 201613
SPSBMX

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BIRMINGHAM AL
1013 AM CST THU DEC 20 2012

ALZ036-040>044-201700-
AUTAUGA AL-COOSA AL-DALLAS AL-ELMORE AL-LOWNDES AL-MONTGOMERY AL-
1013 AM CST THU DEC 20 2012

...SIGNIFICANT WEATHER ADVISORY FOR EASTERN AUTAUGA...MONTGOMERY...
LOWNDES...ELMORE...SOUTHEASTERN DALLAS AND SOUTHERN COOSA COUNTIES
UNTIL 1100 AM CST...

AT 1010 AM CST...THE NATIONAL WEATHER SERVICE WAS TRACKING STRONG
THUNDERSTORMS ALONG A LINE EXTENDING FROM MARBURY TO WHITE HALL TO 8
MILES EAST OF SNOW HILL...AND MOVING EAST AT 45 MPH.

WIND GUSTS UP TO 50 MPH ARE EXPECTED WITH THESE STORMS...ALONG WITH
HEAVY RAIN.

LOCATIONS IN OR NEAR THE PATH OF THESE STORMS INCLUDE...
  MOSSES...
  PRATTVILLE...
  HAYNEVILLE...
  MILLBROOK...
  EQUALITY...

TORRENTIAL RAIN...WHICH MAY FLOOD LOW LYING AREAS SUCH AS DITCHES AND
UNDERPASSES...IS ALSO LIKELY. DO NOT DRIVE YOUR VEHICLE ON A FLOODED
ROADWAY.

&&

LAT...LON 3204 8687 3204 8694 3230 8686 3270 8657
      3271 8641 3275 8637 3284 8646 3284 8601
      3275 8601 3274 8588 3249 8588 3242 8602
      3228 8592 3225 8600 3198 8600 3198 8631
      3205 8631 3205 8639 3198 8640 3198 8686
TIME...MOT...LOC 1613Z 263DEG 38KT 3273 8638 3230 8673
          3205 8685

$$

5

The office that day

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

IssuedProductOfficeCountiesLasted
Dec 19, 9:04 PM CSTWind AdvisoryBMXAutauga, Barbour, Bibb, Blount, Bullock, Calhoun and 33 more23 hr
Dec 20, 6:26 AM CSTSpecial Weather StatementBMXFayette, Lamar, Marion64 min
Dec 20, 6:46 AM CSTSpecial Weather StatementBMXGreene, Pickens, Sumter59 min
Dec 20, 6:56 AM CSTSevere Thunderstorm WarningBMXFayette, Lamar, Marion49 min
Dec 20, 7:03 AM CSTSevere Thunderstorm WarningBMXGreene, Pickens, Sumter57 min
Dec 20, 7:35 AM CSTSpecial Weather StatementBMXWalker, Winston55 min
Dec 20, 7:45 AM CSTSpecial Weather StatementBMXGreene, Hale, Tuscaloosa45 min
Dec 20, 8:21 AM CSTSevere Thunderstorm WarningBMXAutauga, Dallas24 min
Dec 20, 8:25 AM CSTSpecial Weather StatementBMXBibb, Blount, Jefferson, Shelby50 min
Dec 20, 8:47 AM CSTSpecial Weather StatementBMXChilton, Dallas, Perry43 min
Dec 20, 9:09 AM CSTSpecial Weather StatementBMXBlount, Chilton, St. Clair, Shelby51 min
Dec 20, 9:28 AM CSTSpecial Weather StatementBMXAutauga, Dallas, Lowndes47 min
Dec 20, 9:57 AM CSTSpecial Weather StatementBMXCalhoun, Clay, Coosa, Talladega, Tallapoosa48 min
Dec 20, 10:35 AM CSTSevere Thunderstorm WarningBMXAutauga, Elmore, Lowndes, Montgomery40 min
Dec 20, 10:43 AM CSTSpecial Weather StatementBMXChambers, Clay, Cleburne, Randolph, Tallapoosa47 min
Dec 20, 11:13 AM CSTSpecial Weather StatementBMXBullock, Lee, Macon, Montgomery47 min
Dec 20, 11:56 AM CSTSpecial Weather StatementBMXBarbour, Bullock, Lee, Pike, Russell64 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive.