Alert archive / Alabama / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 21, NWS Birmingham, AL

March 25, 2021Blount County, Jefferson County, St. Clair County, Alabama

NWS Birmingham, AL issued this severe thunderstorm warning at Mar 25, 2021, 8:28 PM CDT for Blount County, Jefferson County, St. Clair County, Alabama. It was in force for 28 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 25, 2021, 8:28 PM CDT (01:28 UTC)
Expired: Mar 25, 2021, 8:56 PM CDT
In force: 28 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, St. Clair County, AL

The radar

The Birmingham radar (KBMX), 57 km from the middle of the area, began a volume at 01:27 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 25, 7:47 PM CDT	Tornado Watch	SPC	3 hr

The nearest sounding before it

Birmingham, AL (KBMX), launched 00:00Z, 1.5 hours before the alert went out and 56 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: 1313 J/kg
Mixed-layer CIN: -13 J/kg
Mixed-layer LCL: 662 m above ground
0-6 km bulk shear: 68 kt
0-1 km storm-relative helicity: 341 m²/s²
0-3 km storm-relative helicity: 334 m²/s²
Significant tornado parameter: 3.1
Supercell composite: 13.2

Open this sounding in Storm Lab

The text

As transmitted.

773 
WUUS54 KBMX 260128
SVRBMX
ALC009-073-115-260215-
/O.NEW.KBMX.SV.W.0021.210326T0128Z-210326T0215Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Birmingham AL
828 PM CDT Thu Mar 25 2021

The National Weather Service in Birmingham has issued a

* Severe Thunderstorm Warning for...
  Southeastern Blount County in central Alabama...
  Northeastern Jefferson County in central Alabama...
  Northwestern St. Clair County in central Alabama...

* Until 915 PM CDT.

* At 828 PM CDT, a severe thunderstorm was located near Fultondale,
  moving northeast at 75 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...
  Northern Birmingham, Trussville, Gardendale, Fultondale, Oneonta,
  Springville, Center Point, Clay, Pinson, Tarrant, Adamsville, Argo,
  Graysville, Morris, Brookside, Allgood, Ketona Lakes, Chalkville,
  Grayson Valley and Birmingham Airport.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 100 AM CDT for central
Alabama.

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

&&

LAT...LON 3351 8684 3360 8697 3397 8649 3380 8630
TIME...MOT...LOC 0128Z 229DEG 67KT 3361 8685 

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

32/Davis

3 follow-up statements

905 
WWUS54 KBMX 260135
SVSBMX

Severe Weather Statement
National Weather Service Birmingham AL
835 PM CDT Thu Mar 25 2021

ALC009-073-115-260215-
/O.CON.KBMX.SV.W.0021.000000T0000Z-210326T0215Z/
Blount AL-Jefferson AL-St. Clair AL-
835 PM CDT Thu Mar 25 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 915 PM CDT
FOR SOUTHEASTERN BLOUNT...NORTHEASTERN JEFFERSON AND NORTHWESTERN ST.
CLAIR COUNTIES...

At 835 PM CDT, a severe thunderstorm was located over Pinson, or near
Gardendale, moving northeast at 75 mph.

HAZARD...60 mph wind gusts and half dollar size hail.

SOURCE...Radar indicated.

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

Locations impacted include...
Northern Birmingham, Gardendale, Oneonta, Springville, Center Point,
Clay, Pinson, Argo, Morris, Allgood, Inland Lake, Chalkville, Grayson
Valley, Highland Lake, Palmerdale, St. Clair Springs, Holly Springs,
Village Springs, Caldwell and New Castle.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 100 AM CDT for central
Alabama.

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

&&

LAT...LON 3362 8674 3368 8686 3397 8649 3380 8630
TIME...MOT...LOC 0135Z 229DEG 67KT 3370 8673 

HAIL...1.25IN
WIND...60MPH
 
$$

32/Davis

818 
WWUS54 KBMX 260143
SVSBMX

Severe Weather Statement
National Weather Service Birmingham AL
843 PM CDT Thu Mar 25 2021

ALC073-260153-
/O.CAN.KBMX.SV.W.0021.000000T0000Z-210326T0215Z/
Jefferson AL-
843 PM CDT Thu Mar 25 2021

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

A Tornado Watch remains in effect until 100 AM CDT for central
Alabama.

LAT...LON 3380 8630 3371 8652 3372 8653 3373 8653
      3374 8654 3377 8654 3377 8665 3378 8665
      3380 8670 3397 8649
TIME...MOT...LOC 0143Z 229DEG 67KT 3380 8659 

$$

ALC009-115-260215-
/O.CON.KBMX.SV.W.0021.000000T0000Z-210326T0215Z/
Blount AL-St. Clair AL-
843 PM CDT Thu Mar 25 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 915 PM CDT
FOR SOUTHEASTERN BLOUNT AND NORTHWESTERN ST. CLAIR COUNTIES...

At 843 PM CDT, a severe thunderstorm was located near Inland Lake, or
near Springville, moving northeast at 75 mph.

HAZARD...60 mph wind gusts and half dollar size hail.

SOURCE...Radar indicated.

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

Locations impacted include...
Oneonta, Springville, Argo, Allgood, Inland Lake, Highland Lake, St.
Clair Springs, Clear Springs, Holly Springs, Caldwell and Remlap.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 100 AM CDT for central
Alabama.

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

&&

LAT...LON 3380 8630 3371 8652 3372 8653 3373 8653
      3374 8654 3377 8654 3377 8665 3378 8665
      3380 8670 3397 8649
TIME...MOT...LOC 0143Z 229DEG 67KT 3380 8659 

HAIL...1.25IN
WIND...60MPH
 
$$

32/Davis

293 
WWUS54 KBMX 260156
SVSBMX

Severe Weather Statement
National Weather Service Birmingham AL
856 PM CDT Thu Mar 25 2021

ALC009-115-260206-
/O.CAN.KBMX.SV.W.0021.000000T0000Z-210326T0215Z/
Blount AL-St. Clair AL-
856 PM CDT Thu Mar 25 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN BLOUNT AND
NORTHWESTERN ST. CLAIR COUNTIES IS CANCELLED...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning has been cancelled.

A Tornado Watch remains in effect until 100 AM CDT for central
Alabama.

Remember, a Severe Thunderstorm Warning still remains in effect for
northeastern Blount County and far northern St. Clair County.

LAT...LON 3380 8630 3371 8652 3372 8653 3373 8653
      3374 8654 3377 8654 3377 8665 3378 8665
      3380 8670 3397 8649
TIME...MOT...LOC 0154Z 229DEG 67KT 3396 8637 

$$

32/Davis

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 25, 7:04 PM CDT	Special Weather Statement	BMX	Calhoun	26 min
Mar 25, 7:07 PM CDT	Tornado Warning	BMX	Marengo	24 min
Mar 25, 7:10 PM CDT	Special Weather Statement	BMX	Hale	50 min
Mar 25, 7:16 PM CDT	Severe Thunderstorm Warning	BMX	Greene, Hale	32 min
Mar 25, 7:17 PM CDT	Areal Flood Advisory	BMX	Calhoun, Cherokee, Cleburne	14 min
Mar 25, 7:31 PM CDT	Flash Flood Warning	BMX	Calhoun, Cherokee, Cleburne	3 hr
Mar 25, 7:34 PM CDT	Severe Thunderstorm Warning	BMX	Bibb, Tuscaloosa	23 min
Mar 25, 7:48 PM CDT	Special Weather Statement	BMX	Jefferson	27 min
Mar 25, 8:33 PM CDT	Severe Thunderstorm Warning	BMX	Chilton	42 min
Mar 25, 8:51 PM CDT	Severe Thunderstorm Warning	BMX	Blount, Etowah, St. Clair	25 min
Mar 25, 8:58 PM CDT	Severe Thunderstorm Warning	BMX	Coosa	49 min
Mar 25, 9:01 PM CDT	River Flood Warning	BMX	Bibb, Jefferson, Shelby	24 hr
Mar 25, 9:04 PM CDT	Tornado Warning	BMX	Chilton, Coosa	32 min
Mar 25, 9:21 PM CDT	River Flood Warning	BMX	Jefferson, Tuscaloosa, Walker	12 hr
Mar 25, 9:23 PM CDT	River Flood Warning	BMX	Jefferson, Tuscaloosa, Walker	60 hr
Mar 25, 9:41 PM CDT	River Flood Warning	BMX	Greene, Hale, Tuscaloosa	24 hr
Mar 25, 9:44 PM CDT	River Flood Warning	BMX	Greene, Hale, Marengo, Tuscaloosa	60 hr
Mar 25, 9:47 PM CDT	River Flood Warning	BMX	Sumter	12 hr
Mar 25, 9:49 PM CDT	River Flood Warning	BMX	Greene, Pickens, Sumter	5 days
Mar 25, 9:51 PM CDT	Tornado Warning	BMX	Chambers, Clay, Randolph, Tallapoosa	54 min
Mar 25, 11:20 PM CDT	Areal Flood Warning	BMX	Blount, Jefferson, St. Clair	6 hr
Mar 25, 11:55 PM CDT	River Flood Warning	BMX	Calhoun, Cherokee, Etowah, St. Clair	58 hr
Mar 26, 5:26 AM CDT	River Flood Warning	BMX	Chilton, Coosa, Elmore, Shelby, Talladega	4 days
Mar 26, 5:32 AM CDT	Areal Flood Warning	BMX	Cherokee	6 days

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.