Alert archive / Alabama / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 33, NWS Birmingham, AL

March 28, 2021Blount County, Jefferson County, Walker County, Alabama

NWS Birmingham, AL issued this severe thunderstorm warning at Mar 28, 2021, 6:13 AM CDT for Blount County, Jefferson County, Walker County, Alabama. It was in force for 62 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: Mar 28, 2021, 6:13 AM CDT (11:13 UTC)
Expired: Mar 28, 2021, 7:15 AM CDT
In force: 62 min
Issued by: NWS Birmingham, AL
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Blount County, AL, Jefferson County, AL, Walker County, AL

The radar

The Birmingham radar (KBMX), 74 km from the middle of the area, began a volume at 11:12 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 watch it was issued in

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

Issued	Product	Office	Lasted
Mar 27, 11:27 PM CDT	Tornado Watch	SPC	8 hr
Mar 28, 5:10 AM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Birmingham, AL (KBMX), launched 00:00Z, 11.2 hours before the alert went out and 73 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: 643 J/kg
Mixed-layer CIN: -22 J/kg
Mixed-layer LCL: 1359 m above ground
0-6 km bulk shear: 52 kt
0-1 km storm-relative helicity: 126 m²/s²
0-3 km storm-relative helicity: 152 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 3.7

Open this sounding in Storm Lab

The text

As transmitted.

229 
WUUS54 KBMX 281113
SVRBMX
ALC009-073-127-281215-
/O.NEW.KBMX.SV.W.0033.210328T1113Z-210328T1215Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Birmingham AL
613 AM CDT Sun Mar 28 2021

The National Weather Service in Birmingham has issued a

* Severe Thunderstorm Warning for...
  Eastern Walker County in central Alabama...
  Southwestern Blount County in central Alabama...
  Northern Jefferson County in central Alabama...

* Until 715 AM CDT.

* At 613 AM CDT, a severe thunderstorm was located over Cordova,
  moving east at 50 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...Expect damage to roofs, siding, and trees.

* Locations impacted include...
  Northeastern Birmingham, Trussville, Jasper, Gardendale,
  Fultondale, Sumiton, Cordova, Dora, Cleveland, Dallas, Center
  Point, Clay, Pinson, Tarrant, Adamsville, Warrior, Kimberly,
  Graysville, Morris and Brookside.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Large hail and damaging winds and continuous cloud to ground
lightning is occurring with this storm. Move indoors immediately.
Lightning is one of nature's leading killers. Remember, if you can
hear thunder, you are close enough to be struck by lightning.

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

&&

LAT...LON 3403 8654 3381 8650 3380 8658 3377 8658
      3376 8654 3372 8653 3362 8655 3359 8733
      3360 8742 3374 8726 3390 8734 3394 8711
      3389 8709 3389 8701 3387 8700 3386 8696
      3387 8692 3392 8692 3395 8679 3400 8675
TIME...MOT...LOC 1113Z 262DEG 44KT 3374 8719 

HAIL...<.75IN
WIND...60MPH
 
$$

05

6 follow-up statements

255 
WWUS54 KBMX 281132
SVSBMX

Severe Weather Statement
National Weather Service Birmingham AL
632 AM CDT Sun Mar 28 2021

ALC127-281142-
/O.CAN.KBMX.SV.W.0033.000000T0000Z-210328T1215Z/
Walker AL-
632 AM CDT Sun Mar 28 2021

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN WALKER COUNTY IS
CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

A Severe Thunderstorm Watch remains in effect until 1000 AM CDT for
central Alabama.

LAT...LON 3403 8654 3381 8650 3380 8658 3377 8658
      3376 8654 3372 8653 3362 8655 3360 8720
      3361 8715 3363 8714 3363 8710 3366 8709
      3366 8706 3377 8702 3380 8695 3386 8696
      3387 8692 3392 8692 3395 8679 3400 8675
TIME...MOT...LOC 1132Z 262DEG 44KT 3377 8691 

$$

ALC009-073-281215-
/O.CON.KBMX.SV.W.0033.000000T0000Z-210328T1215Z/
Blount AL-Jefferson AL-
632 AM CDT Sun Mar 28 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 AM CDT
FOR SOUTHWESTERN BLOUNT AND NORTHERN JEFFERSON COUNTIES...

At 632 AM CDT, a severe thunderstorm was located near Kimberly, or 7
miles east of Sumiton, moving east at 50 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Expect damage to roofs, siding, and trees.

Locations impacted include...
Northeastern Birmingham, Trussville, Gardendale, Fultondale, Sumiton,
Cleveland, Dallas, Center Point, Clay, Pinson, Tarrant, Adamsville,
Warrior, Kimberly, Graysville, Morris, Brookside, Locust Fork,
Trafford and Allgood.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Continuous cloud to ground lightning is occurring with this storm.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.

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

&&

LAT...LON 3403 8654 3381 8650 3380 8658 3377 8658
      3376 8654 3372 8653 3362 8655 3360 8720
      3361 8715 3363 8714 3363 8710 3366 8709
      3366 8706 3377 8702 3380 8695 3386 8696
      3387 8692 3392 8692 3395 8679 3400 8675
TIME...MOT...LOC 1132Z 262DEG 44KT 3377 8691 

HAIL...<.75IN
WIND...60MPH
 
$$

05

356 
WWUS54 KBMX 281144
SVSBMX

Severe Weather Statement
National Weather Service Birmingham AL
644 AM CDT Sun Mar 28 2021

ALC009-073-281215-
/O.CON.KBMX.SV.W.0033.000000T0000Z-210328T1215Z/
Blount AL-Jefferson AL-
644 AM CDT Sun Mar 28 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 AM CDT
FOR SOUTHWESTERN BLOUNT AND NORTHEASTERN JEFFERSON COUNTIES...

At 644 AM CDT, a severe thunderstorm was located over County Line, or
9 miles northeast of Gardendale, moving east at 50 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Expect damage to roofs, siding, and trees.

Locations impacted include...
Northeastern Birmingham, Trussville, Gardendale, Fultondale,
Cleveland, Dallas, Center Point, Clay, Pinson, Tarrant, Adamsville,
Warrior, Kimberly, Graysville, Morris, Brookside, Locust Fork,
Trafford, Allgood and Fairview.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Continuous cloud to ground lightning is occurring with this storm.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.

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

&&

LAT...LON 3403 8654 3381 8650 3380 8658 3377 8658
      3376 8654 3372 8653 3362 8655 3360 8705
      3371 8700 3374 8694 3394 8684 3395 8679
      3400 8675
TIME...MOT...LOC 1144Z 262DEG 44KT 3379 8672 

HAIL...<.75IN
WIND...60MPH
 
$$

05

530 
WWUS54 KBMX 281153
SVSBMX

Severe Weather Statement
National Weather Service Birmingham AL
653 AM CDT Sun Mar 28 2021

ALC009-073-281215-
/O.CON.KBMX.SV.W.0033.000000T0000Z-210328T1215Z/
Blount AL-Jefferson AL-
653 AM CDT Sun Mar 28 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 AM CDT
FOR SOUTH CENTRAL BLOUNT AND NORTHEASTERN JEFFERSON COUNTIES...

At 653 AM CDT, a severe thunderstorm was located near Inland Lake, or
near Springville, moving east at 50 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Expect damage to roofs, siding, and trees.

Locations impacted include...
Northeastern Birmingham, Trussville, Gardendale, Fultondale,
Cleveland, Dallas, Center Point, Clay, Pinson, Tarrant, Adamsville,
Warrior, Kimberly, Graysville, Morris, Brookside, Locust Fork,
Trafford, Allgood and Fairview.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Continuous cloud to ground lightning is occurring with this storm.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.

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

&&

LAT...LON 3403 8654 3381 8650 3380 8658 3377 8658
      3376 8654 3372 8653 3362 8655 3360 8699
      3366 8696 3375 8687 3387 8671 3400 8675
TIME...MOT...LOC 1153Z 262DEG 44KT 3381 8659 

HAIL...<.75IN
WIND...60MPH
 
$$

05

079 
WWUS54 KBMX 281200
SVSBMX

Severe Weather Statement
National Weather Service Birmingham AL
700 AM CDT Sun Mar 28 2021

ALC009-073-281215-
/O.CON.KBMX.SV.W.0033.000000T0000Z-210328T1215Z/
Blount AL-Jefferson AL-
700 AM CDT Sun Mar 28 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 AM CDT
FOR SOUTH CENTRAL BLOUNT AND NORTHEASTERN JEFFERSON COUNTIES...

At 700 AM CDT, a severe thunderstorm was located over Inland Lake, or
near Springville, moving east at 50 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Expect damage to roofs, siding, and trees.

Locations impacted include...
Northeastern Birmingham, Trussville, Gardendale, Fultondale,
Cleveland, Dallas, Center Point, Clay, Pinson, Tarrant, Kimberly,
Graysville, Morris, Brookside, Locust Fork, Trafford, Allgood,
Fairview, Nectar and Rosa.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Continuous cloud to ground lightning is occurring with this storm.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.

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

&&

LAT...LON 3381 8650 3380 8658 3377 8658 3376 8654
      3372 8653 3362 8655 3360 8695 3368 8684
      3387 8671 3402 8659 3403 8654
TIME...MOT...LOC 1200Z 262DEG 44KT 3382 8649 

HAIL...<.75IN
WIND...60MPH
 
$$

05

473 
WWUS54 KBMX 281207
SVSBMX

Severe Weather Statement
National Weather Service Birmingham AL
707 AM CDT Sun Mar 28 2021

ALC009-073-281215-
/O.CON.KBMX.SV.W.0033.000000T0000Z-210328T1215Z/
Blount AL-Jefferson AL-
707 AM CDT Sun Mar 28 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 AM CDT
FOR SOUTH CENTRAL BLOUNT AND NORTHEASTERN JEFFERSON COUNTIES...

At 707 AM CDT, a severe thunderstorm was located near Ashville, or
near Springville, moving east at 50 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Expect damage to roofs, siding, and trees.

Locations impacted include...
Northeastern Birmingham, Trussville, Center Point, Clay, Pinson,
Inland Lake, Grayson Valley, Chalkville, Palmerdale and Village
Springs.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Continuous cloud to ground lightning is occurring with this storm.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.

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

&&

LAT...LON 3381 8650 3380 8658 3377 8658 3376 8654
      3372 8653 3362 8655 3361 8673 3367 8670
      3376 8675 3388 8651
TIME...MOT...LOC 1207Z 262DEG 44KT 3383 8638 

HAIL...<.75IN
WIND...60MPH
 
$$

05

607 
WWUS54 KBMX 281211
SVSBMX

Severe Weather Statement
National Weather Service Birmingham AL
711 AM CDT Sun Mar 28 2021

ALC009-073-281221-
/O.EXP.KBMX.SV.W.0033.000000T0000Z-210328T1215Z/
Blount AL-Jefferson AL-
711 AM CDT Sun Mar 28 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL BLOUNT AND
NORTHEASTERN JEFFERSON COUNTIES WILL EXPIRE AT 715 AM CDT...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.

A Severe Thunderstorm Watch remains in effect until 1000 AM CDT for
central Alabama.

LAT...LON 3381 8650 3380 8658 3377 8658 3376 8654
      3372 8653 3362 8655 3361 8673 3367 8670
      3376 8675 3388 8651
TIME...MOT...LOC 1211Z 262DEG 44KT 3384 8632 

$$

05

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 28, 2:47 AM CDT	Severe Thunderstorm Warning	BMX	Marion	43 min
Mar 28, 3:25 AM CDT	Special Weather Statement	BMX	Winston	35 min
Mar 28, 3:47 AM CDT	Severe Thunderstorm Warning	BMX	Fayette, Lamar, Marion	58 min
Mar 28, 4:15 AM CDT	Special Weather Statement	BMX	Winston	45 min
Mar 28, 4:32 AM CDT	Severe Thunderstorm Warning	BMX	Fayette, Walker, Winston	47 min
Mar 28, 5:17 AM CDT	Special Weather Statement	BMX	Walker	43 min
Mar 28, 5:46 AM CDT	Special Weather Statement	BMX	Marshall	29 min
Mar 28, 6:01 AM CDT	Special Weather Statement	BMX	Tuscaloosa, Walker	44 min
Mar 28, 6:27 AM CDT	Special Weather Statement	BMX	Jefferson, Tuscaloosa	63 min
Mar 28, 6:34 AM CDT	Special Weather Statement	BMX	DeKalb	26 min
Mar 28, 6:46 AM CDT	Special Weather Statement	BMX	Blount, Etowah	59 min
Mar 28, 6:59 AM CDT	Special Weather Statement	BMX	St. Clair, Shelby	61 min
Mar 28, 7:13 AM CDT	Severe Thunderstorm Warning	BMX	Jefferson, St. Clair, Shelby	32 min
Mar 28, 7:19 AM CDT	Special Weather Statement	BMX	Cherokee	26 min
Mar 28, 7:37 AM CDT	Severe Thunderstorm Warning	BMX	Calhoun, St. Clair, Talladega	38 min
Mar 28, 7:41 AM CDT	Special Weather Statement	BMX	Bibb, Shelby	64 min
Mar 28, 7:45 AM CDT	Special Weather Statement	BMX	Cherokee	30 min
Mar 28, 7:50 AM CDT	Severe Thunderstorm Warning	BMX	Shelby	40 min
Mar 28, 8:05 AM CDT	Special Weather Statement	BMX	Clay, Talladega	55 min
Mar 28, 8:22 AM CDT	Special Weather Statement	BMX	Coosa	23 min
Mar 28, 8:23 AM CDT	Special Weather Statement	BMX	Perry	37 min
Mar 28, 8:38 AM CDT	Special Weather Statement	BMX	Randolph	37 min
Mar 28, 9:40 AM CDT	Special Weather Statement	BMX	Clay	35 min
Mar 28, 9:44 AM CDT	River Flood Warning	BMX	Cherokee, Etowah, St. Clair	8 days
Mar 28, 10:03 AM CDT	Special Weather Statement	BMX	Randolph	42 min
Mar 28, 10:33 AM CDT	Special Weather Statement	BMX	Chambers	42 min
Mar 28, 12:38 PM CDT	River Flood Warning	BMX	Sumter	57 hr

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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.