Alert archive / Alabama / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 73, NWS Birmingham, AL

April 24, 2021Bibb County, Shelby County, Talladega County, Alabama

NWS Birmingham, AL issued this severe thunderstorm warning at Apr 24, 2021, 5:37 PM CDT for Bibb County, Shelby County, Talladega County, Alabama. It was in force for 23 min. 2 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: Apr 24, 2021, 5:37 PM CDT (22:37 UTC)
Expired: Apr 24, 2021, 6:00 PM CDT
In force: 23 min
Issued by: NWS Birmingham, AL
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Bibb County, AL, Shelby County, AL, Talladega County, AL

The radar

The Birmingham radar (KBMX), 8 km from the middle of the area, began a volume at 22:40 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.

What was reported inside it

Time	Report	Where	Remark
Apr 24, 5:50 PM CDT	HAIL 0.75	3 S Shelby County Airpo, AL	REPORT FROM MPING: DIME (0.75 IN.).
Apr 24, 6:00 PM CDT	TSTM WND DMG	4 Nne Columbiana, AL	NUMEROUS TREES DOWN AROUND THE FOURMILE COMMUNITY AND AROUND COLUMBIANA. TIME ESTIMATED BY RADAR.

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

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Apr 24, 4:52 PM CDT	Severe Thunderstorm Watch	SPC	4 hr

The nearest sounding before it

Birmingham, AL (KBMX), launched 12:00Z, 10.6 hours before the alert went out and 6 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 580 m above ground
0-6 km bulk shear: 62 kt
0-1 km storm-relative helicity: 855 m²/s²
0-3 km storm-relative helicity: 1103 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

119 
WUUS54 KBMX 242237
SVRBMX
ALC007-117-121-242300-
/O.NEW.KBMX.SV.W.0073.210424T2237Z-210424T2300Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Birmingham AL
537 PM CDT Sat Apr 24 2021

The National Weather Service in Birmingham has issued a

* Severe Thunderstorm Warning for...
  Southwestern Talladega County in east central Alabama...
  Shelby County in central Alabama...
  Northeastern Bibb County in central Alabama...

* Until 600 PM CDT.

* At 537 PM CDT, severe thunderstorms were located along a line
  extending from Oak Mountain Amphitheater to near West Blocton,
  moving east at 55 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...
  Hoover, Alabaster, Pelham, Helena, Calera, Chelsea, Montevallo,
  Columbiana, Wilsonville, Indian Springs Village, Harpersville,
  Westover, West Blocton, Wilton, American Village, Oak Mountain
  State Park, Maylene, Oak Mountain Amphitheater, Riverchase and
  University Of Montevallo.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

To report severe weather, contact your nearest law enforcement
agency. They will send your report to the National Weather Service
office in Birmingham.

&&

LAT...LON 3307 8717 3325 8700 3325 8698 3327 8697
      3328 8693 3330 8693 3333 8688 3333 8683
      3336 8683 3335 8634 3310 8648 3309 8651
      3307 8651
TIME...MOT...LOC 2237Z 268DEG 47KT 3332 8678 3311 8708 

HAIL...1.00IN
WIND...60MPH
 
$$

75 Linhares

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 24, 4:37 AM CDT	Special Weather Statement	BMX	Lowndes	68 min
Apr 24, 5:40 AM CDT	Special Weather Statement	BMX	Lowndes	65 min
Apr 24, 6:24 AM CDT	Special Weather Statement	BMX	Montgomery	36 min
Apr 24, 6:26 AM CDT	Special Weather Statement	BMX	Pike	49 min
Apr 24, 7:05 AM CDT	Special Weather Statement	BMX	Barbour, Bullock, Lee, Macon, Russell	55 min
Apr 24, 8:04 AM CDT	Special Weather Statement	BMX	Sumter	26 min
Apr 24, 8:25 AM CDT	Special Weather Statement	BMX	Hale	35 min
Apr 24, 8:55 AM CDT	Special Weather Statement	BMX	Perry	35 min
Apr 24, 9:02 AM CDT	Special Weather Statement	BMX	Marengo	28 min
Apr 24, 9:46 AM CDT	Special Weather Statement	BMX	Dallas	29 min
Apr 24, 10:33 AM CDT	Special Weather Statement	BMX	Lowndes, Montgomery	42 min
Apr 24, 11:05 AM CDT	Special Weather Statement	BMX	Macon	40 min
Apr 24, 3:11 PM CDT	Special Weather Statement	BMX	Perry	34 min
Apr 24, 3:22 PM CDT	Special Weather Statement	BMX	Montgomery	38 min
Apr 24, 3:26 PM CDT	Special Weather Statement	BMX	Fayette	34 min
Apr 24, 3:27 PM CDT	Special Weather Statement	BMX	Winston	33 min
Apr 24, 3:28 PM CDT	Severe Thunderstorm Warning	BMX	Macon, Montgomery	32 min
Apr 24, 3:31 PM CDT	Special Weather Statement	BMX	Clay	29 min
Apr 24, 3:35 PM CDT	Severe Thunderstorm Warning	BMX	Fayette, Marion, Walker, Winston	40 min
Apr 24, 3:44 PM CDT	Severe Thunderstorm Warning	BMX	Macon, Tallapoosa	31 min
Apr 24, 3:58 PM CDT	Severe Thunderstorm Warning	BMX	Lee	35 min
Apr 24, 4:00 PM CDT	Special Weather Statement	BMX	Winston	15 min
Apr 24, 4:01 PM CDT	Special Weather Statement	BMX	Randolph	44 min
Apr 24, 4:03 PM CDT	Special Weather Statement	BMX	Autauga	42 min
Apr 24, 4:14 PM CDT	Special Weather Statement	BMX	Walker	46 min
Apr 24, 4:14 PM CDT	Severe Thunderstorm Warning	BMX	Chambers	33 min
Apr 24, 4:18 PM CDT	Special Weather Statement	BMX	Lowndes	42 min
Apr 24, 4:22 PM CDT	Special Weather Statement	BMX	Russell	23 min
Apr 24, 4:29 PM CDT	Special Weather Statement	BMX	Blount, Tuscaloosa	61 min
Apr 24, 4:31 PM CDT	Severe Thunderstorm Warning	BMX	Jefferson, Walker	29 min
Apr 24, 4:35 PM CDT	Severe Thunderstorm Warning	BMX	Elmore, Montgomery	36 min
Apr 24, 4:35 PM CDT	Severe Thunderstorm Warning	BMX	Blount, Jefferson	25 min
Apr 24, 4:52 PM CDT	Special Weather Statement	BMX	Chambers, Randolph, Tallapoosa	38 min
Apr 24, 4:55 PM CDT	Severe Thunderstorm Warning	BMX	Lee, Macon, Tallapoosa	38 min
Apr 24, 4:58 PM CDT	Severe Thunderstorm Warning	BMX	Jefferson, St. Clair	32 min
Apr 24, 5:02 PM CDT	Severe Thunderstorm Warning	BMX	Blount, St. Clair	28 min
Apr 24, 5:17 PM CDT	Severe Thunderstorm Warning	BMX	Calhoun, Etowah, St. Clair	43 min
Apr 24, 5:23 PM CDT	Severe Thunderstorm Warning	BMX	Pike	52 min
Apr 24, 5:25 PM CDT	Special Weather Statement	BMX	Bibb, St. Clair, Shelby	35 min
Apr 24, 5:40 PM CDT	Severe Thunderstorm Warning	BMX	Calhoun, St. Clair, Shelby, Talladega	35 min
Apr 24, 5:43 PM CDT	Severe Thunderstorm Warning	BMX	Barbour, Bullock	47 min
Apr 24, 5:44 PM CDT	Severe Thunderstorm Warning	BMX	Cherokee	31 min
Apr 24, 5:52 PM CDT	Severe Thunderstorm Warning	BMX	Calhoun, Cherokee, Cleburne, Etowah	37 min
Apr 24, 5:58 PM CDT	Special Weather Statement	BMX	Shelby	32 min
Apr 24, 6:09 PM CDT	Severe Thunderstorm Warning	BMX	Calhoun, Clay, Cleburne, Shelby, Talladega	51 min
Apr 24, 6:12 PM CDT	Severe Thunderstorm Warning	BMX	Barbour	18 min
Apr 24, 6:22 PM CDT	Severe Thunderstorm Warning	BMX	Barbour, Pike	38 min
Apr 24, 6:28 PM CDT	Severe Thunderstorm Warning	BMX	Cleburne	32 min
Apr 24, 6:37 PM CDT	Special Weather Statement	BMX	Clay, Randolph	38 min
Apr 24, 6:48 PM CDT	Severe Thunderstorm Warning	BMX	Chambers, Clay, Randolph, Tallapoosa	57 min

Nearby

Severe Thunderstorm Warnings in Alabama, 2021 Every 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.