Alert archive / Alabama / Special Weather Statements in 2021

Special Weather Statement, NWS Birmingham, AL

October 4, 2021Coosa County, Alabama

NWS Birmingham, AL issued this special weather statement at Oct 4, 2021, 3:12 PM CDT for Coosa County, Alabama. It was in force for 33 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
Oct 4, 2021, 3:12 PM CDT (20:12 UTC)
Expired
Oct 4, 2021, 3:45 PM CDT
In force
33 min
Issued by
NWS Birmingham, AL
Hail
0.00 in
Wind
40

County Coosa County, AL

The radar

The Birmingham radar (KBMX), 48 km from the middle of the area, began a volume at 20:16 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, 8.2 hours before the alert went out and 50 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 2021-10-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 565 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 2021-10-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 34 square meters per square second.193958Sfc1 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
565 J/kg
Mixed-layer CIN
-7 J/kg
Mixed-layer LCL
616 m above ground
0-6 km bulk shear
25 kt
0-1 km storm-relative helicity
34 m²/s²
0-3 km storm-relative helicity
69 m²/s²
Significant tornado parameter
0.1
Supercell composite
0.5

Open this sounding in Storm Lab

The text

As transmitted.

858 
WWUS84 KBMX 042012
SPSBMX

Special Weather Statement
National Weather Service Birmingham AL
312 PM CDT Mon Oct 4 2021
 
ALZ036-042045-
Coosa AL-
312 PM CDT Mon Oct 4 2021

...A strong thunderstorm will impact portions of central Coosa County
through 345 PM CDT...

At 311 PM CDT, Doppler radar was tracking a strong thunderstorm over
Unity, or near Weogufka, moving east at 10 mph.

HAZARD...Winds in excess of 40 mph.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around 
         unsecured objects.

Locations impacted include...
Rockford, Weogufka, Hanover, Lyle, Unity, Moriah, Strickland
Crossroads, Bentleyville and Mitchell Lake.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building. 

Torrential rainfall is also occurring with this storm and may lead to
localized flooding. Do not drive your vehicle through flooded
roadways.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 3282 8625 3291 8649 3291 8650 3308 8640
      3303 8615
TIME...MOT...LOC 2011Z 281DEG 9KT 3298 8636 

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...40 MPH

$$

25/Owen

The office that day

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

IssuedProductOfficeCountiesLasted
Oct 3, 8:04 PM CDTAreal Flood AdvisoryBMXFayette, Walker116 min
Oct 3, 9:05 PM CDTFlash Flood WarningBMXFayette, Jefferson, Marion, Walker3 hr
Oct 3, 10:59 PM CDTAreal Flood AdvisoryBMXJefferson3 hr
Oct 4, 12:53 AM CDTAreal Flood AdvisoryBMXJefferson, St. Clair, Shelby3 hr
Oct 4, 1:23 AM CDTDense Fog AdvisoryBMXBlount, Fayette, Lamar, Marion, Pickens, Tuscaloosa and 2 more8 hr
Oct 4, 3:11 AM CDTFlash Flood WatchBMXAutauga, Barbour, Bibb, Blount, Bullock, Calhoun and 30 more3 days
Oct 4, 9:37 AM CDTAreal Flood AdvisoryBMXLee3 hr
Oct 4, 11:51 AM CDTAreal Flood AdvisoryBMXRussell3 hr
Oct 4, 12:20 PM CDTFlash Flood WarningBMXLee, Russell3 hr
Oct 4, 12:44 PM CDTAreal Flood AdvisoryBMXLowndes, Montgomery3 hr
Oct 4, 1:33 PM CDTFlash Flood WarningBMXMontgomery87 min
Oct 4, 3:21 PM CDTFlash Flood WarningBMXLee, Russell3 hr
Oct 4, 3:28 PM CDTFlash Flood WarningBMXLowndes, Montgomery3 hr
Oct 4, 4:40 PM CDTAreal Flood AdvisoryBMXChilton, Coosa3 hr
Oct 4, 4:56 PM CDTFlash Flood WarningBMXChilton3 hr
Oct 4, 5:09 PM CDTSpecial Weather StatementBMXBibb36 min
Oct 4, 5:09 PM CDTSpecial Weather StatementBMXShelby36 min
Oct 4, 5:16 PM CDTSevere Thunderstorm WarningBMXBibb29 min
Oct 4, 5:22 PM CDTSpecial Weather StatementBMXShelby23 min
Oct 4, 5:43 PM CDTSevere Thunderstorm WarningBMXShelby47 min
Oct 4, 5:47 PM CDTSevere Thunderstorm WarningBMXBibb, Shelby43 min
Oct 4, 6:02 PM CDTSpecial Weather StatementBMXShelby28 min
Oct 4, 6:17 PM CDTSpecial Weather StatementBMXJefferson28 min
Oct 4, 6:34 PM CDTSpecial Weather StatementBMXJefferson26 min

Nearby

Special Weather Statements in Alabama, 2021Every special weather statement in 2021

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.