Alert archive / Alabama / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 67, NWS Birmingham, AL

April 24, 2021Blount County, Jefferson County, Alabama

NWS Birmingham, AL issued this severe thunderstorm warning at Apr 24, 2021, 4:35 PM CDT for Blount County, Jefferson County, Alabama. It was in force for 25 min. 3 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, 4:35 PM CDT (21:35 UTC)
Expired: Apr 24, 2021, 5:00 PM CDT
In force: 25 min
Issued by: NWS Birmingham, AL
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Blount County, AL, Jefferson County, AL

The radar

The Birmingham radar (KBMX), 82 km from the middle of the area, began a volume at 21:36 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, 4:44 PM CDT	HAIL 1.5	Warrior, AL
Apr 24, 4:47 PM CDT	HAIL 1.25	Hayden, AL
Apr 24, 4:48 PM CDT	HAIL 0.5	2 S Hayden, AL	REPORT FROM MPING: HALF-INCH (0.50 IN.).

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, 9.6 hours before the alert went out and 81 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.

655 
WUUS54 KBMX 242135 RRA
SVRBMX
ALC009-073-242200-
/O.NEW.KBMX.SV.W.0067.210424T2135Z-210424T2200Z/

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

The National Weather Service in Birmingham has issued a

* Severe Thunderstorm Warning for...
  Southwestern Blount County in central Alabama...
  North central Jefferson County in central Alabama...

* Until 500 PM CDT.

* At 435 PM CDT, a severe thunderstorm was located near Arkadelphia,
  or 10 miles northeast of Sumiton, moving east at 50 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...
  Dallas, Warrior, Kimberly, Locust Fork, Trafford, Hayden, Nectar,
  County Line, Blount Springs, Bangor, Arkadelphia, Smoke Rise,
  Remlap, Rickwood Caverns and Partridge Crossroads.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3380 8657 3377 8658 3376 8696 3379 8697
      3380 8695 3387 8696 3387 8692 3391 8692
      3392 8689 3394 8688 3393 8686 3395 8684
      3394 8682 3396 8682 3395 8679 3397 8677
      3399 8676 3403 8670 3405 8671 3407 8669
TIME...MOT...LOC 2135Z 264DEG 42KT 3384 8689 

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

75 Linhares

1 follow-up statement

265 
WWUS54 KBMX 242148
SVSBMX

Severe Weather Statement
National Weather Service Birmingham AL
448 PM CDT Sat Apr 24 2021

ALC009-073-242200-
/O.CON.KBMX.SV.W.0067.000000T0000Z-210424T2200Z/
Blount AL-Jefferson AL-
448 PM CDT Sat Apr 24 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 500 PM CDT
FOR SOUTHWESTERN BLOUNT AND NORTH CENTRAL JEFFERSON COUNTIES...

At 447 PM CDT, a severe thunderstorm was located over Trafford, or 13
miles north of Gardendale, moving east at 45 mph.

HAZARD...Ping pong ball size hail and 60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...hail may damage roofs, siding, windows, and vehicles. 
         
Locations impacted include...
Dallas, Warrior, Kimberly, Locust Fork, Trafford, Hayden, Nectar,
County Line, Blount Springs, Bangor, Arkadelphia, Smoke Rise, Remlap,
Rickwood Caverns and Partridge Crossroads.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

This storm is producing and large damaging hail.
SEEK SHELTER NOW inside a sturdy structure and stay away from
windows.

&&

LAT...LON 3380 8657 3377 8658 3376 8696 3379 8697
      3380 8695 3387 8696 3387 8692 3391 8692
      3392 8689 3394 8688 3393 8686 3395 8684
      3394 8682 3396 8682 3395 8679 3397 8677
      3399 8676 3403 8670 3405 8671 3407 8669
TIME...MOT...LOC 2147Z 262DEG 40KT 3386 8677 

HAIL...1.50IN
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, 4:52 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, 5:37 PM CDT	Severe Thunderstorm Warning	BMX	Bibb, Shelby, Talladega	23 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.