Alert archive / Alabama / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 150, NWS Birmingham, AL

October 4, 2021Bibb County, Alabama

NWS Birmingham, AL issued this severe thunderstorm warning at Oct 4, 2021, 5:16 PM CDT for Bibb County, Alabama. It was in force for 29 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, 5:16 PM CDT (22:16 UTC)
Expired
Oct 4, 2021, 5:45 PM CDT
In force
29 min
Issued by
NWS Birmingham, AL
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

County Bibb County, AL

The radar

The Birmingham radar (KBMX), 39 km from the middle of the area, began a volume at 22:15 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, 10.3 hours before the alert went out and 39 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.

118 
WUUS54 KBMX 042216
SVRBMX
ALC007-042245-
/O.NEW.KBMX.SV.W.0150.211004T2216Z-211004T2245Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Birmingham AL
516 PM CDT Mon Oct 4 2021

The National Weather Service in Birmingham has issued a

* Severe Thunderstorm Warning for...
  Southeastern Bibb County in central Alabama...

* Until 545 PM CDT.

* At 515 PM CDT, a severe thunderstorm was located near Talladega 
  National Forest, or near Centreville, and moving northeast at 8 
  mph.

  HAZARD...60 mph wind gusts and quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees.

* Locations impacted include...
  Centreville, Trio and Bibb County Airport. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

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

&&

LAT...LON 3300 8705 3293 8695 3284 8705 3284 8707
      3289 8718
TIME...MOT...LOC 2215Z 029DEG 1KT 3291 8707 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

75 Linhares
1 follow-up statement
399 
WWUS54 KBMX 042235
SVSBMX

Severe Weather Statement
National Weather Service Birmingham AL
535 PM CDT Mon Oct 4 2021

ALC007-042245-
/O.EXP.KBMX.SV.W.0150.000000T0000Z-211004T2245Z/
Bibb AL-
535 PM CDT Mon Oct 4 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN BIBB COUNTY WILL
EXPIRE AT 545 PM CDT...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.

LAT...LON 3300 8705 3293 8695 3284 8705 3284 8707
      3289 8718
TIME...MOT...LOC 2235Z 029DEG 1KT 3291 8707 

$$

75 Linhares

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, 3:12 PM CDTSpecial Weather StatementBMXCoosa33 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, 5:22 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

Severe Thunderstorm Warnings in Alabama, 2021Every severe thunderstorm warning 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.