Alert archive / Alabama / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 34, NWS Birmingham, AL

March 28, 2021Jefferson County, St. Clair County, Shelby County, Alabama

NWS Birmingham, AL issued this severe thunderstorm warning at Mar 28, 2021, 7:13 AM CDT for Jefferson County, St. Clair County, Shelby County, Alabama. It was in force for 32 min. 1 report 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
Mar 28, 2021, 7:13 AM CDT (12:13 UTC)
Expired
Mar 28, 2021, 7:45 AM CDT
In force
32 min
Issued by
NWS Birmingham, AL
Area
Storm-based polygon
Hail
0.75 in
Wind
60.0 mph

Counties Jefferson County, AL, Shelby County, AL, St. Clair County, AL

The radar

The Birmingham radar (KBMX), 61 km from the middle of the area, began a volume at 12:13 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

TimeReportWhereRemark
Mar 28, 7:17 AM CDTTSTM WND DMGLake Purdy At Grants Mi, ALTREES AND POWERLINES DOWN ON HIGHWAY 119 NORTH OF GRANTS MILL ROAD AND ALONG REX LAKE ROAD.

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.

IssuedProductOfficeLasted
Mar 28, 5:10 AM CDTSevere Thunderstorm WatchSPC5 hr

The nearest sounding before it

Birmingham, AL (KBMX), launched 12:00Z, 0.2 hours before the alert went out and 61 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 2021-03-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 757 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 2021-03-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 326 square meters per square second.1939587897117Sfc1 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
757 J/kg
Mixed-layer CIN
-3 J/kg
Mixed-layer LCL
650 m above ground
0-6 km bulk shear
74 kt
0-1 km storm-relative helicity
326 m²/s²
0-3 km storm-relative helicity
355 m²/s²
Significant tornado parameter
1.6
Supercell composite
9.1

Open this sounding in Storm Lab

The text

As transmitted.

881 
WUUS54 KBMX 281213
SVRBMX
ALC073-115-117-281245-
/O.NEW.KBMX.SV.W.0034.210328T1213Z-210328T1245Z/

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

The National Weather Service in Birmingham has issued a

* Severe Thunderstorm Warning for...
  Northeastern Shelby County in central Alabama...
  East central Jefferson County in central Alabama...
  Southwestern St. Clair County in central Alabama...

* Until 745 AM CDT.

* At 713 AM CDT, a severe thunderstorm was located over Barber
  Motorsports Park, or near Leeds, moving east at 60 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Eastern Birmingham, Vestavia Hills, Homewood, Mountain Brook,
  Trussville, Pell City, Irondale, Leeds, Moody, Center Point,
  Vincent, Shops of Grand River, Bald Rock, Vandiver, Barber
  Motorsports Park, Greystone, Samford University, Cahaba Heights,
  Logan Martin Lake and Alton.

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 3362 8617 3361 8620 3359 8618 3359 8622
      3356 8621 3355 8619 3354 8619 3352 8623
      3350 8623 3349 8625 3349 8627 3351 8626
      3351 8628 3346 8630 3341 8635 3344 8682
      3364 8670 3364 8617
TIME...MOT...LOC 1213Z 270DEG 50KT 3352 8663 

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

05
5 follow-up statements
442 
WWUS54 KBMX 281218
SVSBMX

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

ALC073-115-117-281245-
/O.CON.KBMX.SV.W.0034.000000T0000Z-210328T1245Z/
Shelby AL-Jefferson AL-St. Clair AL-
718 AM CDT Sun Mar 28 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 745 AM CDT
FOR NORTHEASTERN SHELBY...EAST CENTRAL JEFFERSON AND SOUTHWESTERN ST.
CLAIR COUNTIES...

At 718 AM CDT, a severe thunderstorm was located over Leeds, moving
east at 60 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

Locations impacted include...
Vestavia Hills, Mountain Brook, Trussville, Pell City, Irondale,
Leeds, Moody, Vincent, Shops of Grand River, Bald Rock, Vandiver,
Barber Motorsports Park, Greystone, Cahaba Heights, Logan Martin
Lake, Coosa Island, The Summit, Lake Purdy, Brook Highland and
Branchville.

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 3362 8617 3361 8620 3359 8618 3359 8622
      3356 8621 3355 8619 3354 8619 3352 8623
      3350 8623 3349 8625 3349 8627 3351 8626
      3351 8628 3346 8630 3341 8635 3344 8676
      3364 8657 3364 8617
TIME...MOT...LOC 1218Z 270DEG 50KT 3352 8654 

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

05
150 
WWUS54 KBMX 281224
SVSBMX

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

ALC073-281234-
/O.CAN.KBMX.SV.W.0034.000000T0000Z-210328T1245Z/
Jefferson AL-
724 AM CDT Sun Mar 28 2021

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL 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 Severe Thunderstorm Watch remains in effect until 1000 AM CDT for
central and east central Alabama.

LAT...LON 3362 8617 3361 8620 3359 8618 3359 8622
      3354 8619 3352 8623 3349 8625 3351 8626
      3351 8628 3346 8630 3341 8635 3343 8665
      3348 8659 3351 8657 3353 8652 3356 8652
      3364 8647 3364 8617
TIME...MOT...LOC 1224Z 269DEG 46KT 3352 8647 

$$

ALC115-117-281245-
/O.CON.KBMX.SV.W.0034.000000T0000Z-210328T1245Z/
Shelby AL-St. Clair AL-
724 AM CDT Sun Mar 28 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 745 AM CDT
FOR NORTHEASTERN SHELBY AND SOUTHWESTERN ST. CLAIR COUNTIES...

At 724 AM CDT, a severe thunderstorm was located near Vandiver, or
near Moody, moving east at 55 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

Locations impacted include...
Pell City, Leeds, Moody, Vincent, Bald Rock, Logan Martin Lake,
Vandiver, Coosa Island, Branchville, St. Clair County Airport,
Sterrett, Chula Vista, Camp Winnataska, Shoal Creek and Cropwell.

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 3362 8617 3361 8620 3359 8618 3359 8622
      3354 8619 3352 8623 3349 8625 3351 8626
      3351 8628 3346 8630 3341 8635 3343 8665
      3348 8659 3351 8657 3353 8652 3356 8652
      3364 8647 3364 8617
TIME...MOT...LOC 1224Z 269DEG 46KT 3352 8647 

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

05
866 
WWUS54 KBMX 281231
SVSBMX

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

ALC115-117-281245-
/O.CON.KBMX.SV.W.0034.000000T0000Z-210328T1245Z/
Shelby AL-St. Clair AL-
731 AM CDT Sun Mar 28 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 745 AM CDT
FOR NORTHEASTERN SHELBY AND SOUTH CENTRAL ST. CLAIR COUNTIES...

At 731 AM CDT, a severe thunderstorm was located near Coosa Island,
or near Pell City, moving east at 60 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

Locations impacted include...
Pell City, Vincent, Coosa Island, Logan Martin Lake, St. Clair County
Airport, Sterrett, Chula Vista and Cropwell.

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 3362 8617 3361 8620 3359 8618 3359 8622
      3354 8619 3352 8623 3349 8625 3351 8626
      3351 8628 3346 8630 3341 8635 3343 8651
      3351 8644 3364 8640 3364 8617
TIME...MOT...LOC 1231Z 270DEG 50KT 3352 8634 

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

05
993 
WWUS54 KBMX 281235
SVSBMX

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

ALC115-117-281245-
/O.CON.KBMX.SV.W.0034.000000T0000Z-210328T1245Z/
Shelby AL-St. Clair AL-
735 AM CDT Sun Mar 28 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 745 AM CDT
FOR NORTHEASTERN SHELBY AND SOUTH CENTRAL ST. CLAIR COUNTIES...

At 735 AM CDT, a severe thunderstorm was located over Logan Martin
Lake, or over Pell City, moving east at 60 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

Locations impacted include...
Pell City, Vincent, Coosa Island, Logan Martin Lake, St. Clair County
Airport, Sterrett and Cropwell.

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 3362 8617 3361 8620 3359 8618 3359 8622
      3354 8619 3352 8623 3349 8625 3351 8626
      3351 8628 3346 8630 3341 8635 3343 8651
      3352 8640 3364 8631 3364 8617
TIME...MOT...LOC 1235Z 270DEG 50KT 3352 8626 

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

05
472 
WWUS54 KBMX 281243
SVSBMX

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

ALC115-117-281252-
/O.EXP.KBMX.SV.W.0034.000000T0000Z-210328T1245Z/
Shelby AL-St. Clair AL-
743 AM CDT Sun Mar 28 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN SHELBY AND SOUTH
CENTRAL ST. CLAIR COUNTIES WILL EXPIRE AT 745 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 and east central Alabama.

LAT...LON 3362 8617 3361 8620 3359 8618 3359 8622
      3354 8619 3352 8623 3349 8625 3351 8626
      3351 8628 3346 8630 3341 8635 3343 8651
      3352 8640 3364 8631 3364 8617
TIME...MOT...LOC 1242Z 270DEG 50KT 3352 8615 

$$

05

The office that day

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

IssuedProductOfficeCountiesLasted
Mar 28, 2:47 AM CDTSevere Thunderstorm WarningBMXMarion43 min
Mar 28, 3:25 AM CDTSpecial Weather StatementBMXWinston35 min
Mar 28, 3:47 AM CDTSevere Thunderstorm WarningBMXFayette, Lamar, Marion58 min
Mar 28, 4:15 AM CDTSpecial Weather StatementBMXWinston45 min
Mar 28, 4:32 AM CDTSevere Thunderstorm WarningBMXFayette, Walker, Winston47 min
Mar 28, 5:17 AM CDTSpecial Weather StatementBMXWalker43 min
Mar 28, 5:46 AM CDTSpecial Weather StatementBMXMarshall29 min
Mar 28, 6:01 AM CDTSpecial Weather StatementBMXTuscaloosa, Walker44 min
Mar 28, 6:13 AM CDTSevere Thunderstorm WarningBMXBlount, Jefferson, Walker62 min
Mar 28, 6:27 AM CDTSpecial Weather StatementBMXJefferson, Tuscaloosa63 min
Mar 28, 6:34 AM CDTSpecial Weather StatementBMXDeKalb26 min
Mar 28, 6:46 AM CDTSpecial Weather StatementBMXBlount, Etowah59 min
Mar 28, 6:59 AM CDTSpecial Weather StatementBMXSt. Clair, Shelby61 min
Mar 28, 7:19 AM CDTSpecial Weather StatementBMXCherokee26 min
Mar 28, 7:37 AM CDTSevere Thunderstorm WarningBMXCalhoun, St. Clair, Talladega38 min
Mar 28, 7:41 AM CDTSpecial Weather StatementBMXBibb, Shelby64 min
Mar 28, 7:45 AM CDTSpecial Weather StatementBMXCherokee30 min
Mar 28, 7:50 AM CDTSevere Thunderstorm WarningBMXShelby40 min
Mar 28, 8:05 AM CDTSpecial Weather StatementBMXClay, Talladega55 min
Mar 28, 8:22 AM CDTSpecial Weather StatementBMXCoosa23 min
Mar 28, 8:23 AM CDTSpecial Weather StatementBMXPerry37 min
Mar 28, 8:38 AM CDTSpecial Weather StatementBMXRandolph37 min
Mar 28, 9:40 AM CDTSpecial Weather StatementBMXClay35 min
Mar 28, 9:44 AM CDTRiver Flood WarningBMXCherokee, Etowah, St. Clair8 days
Mar 28, 10:03 AM CDTSpecial Weather StatementBMXRandolph42 min
Mar 28, 10:33 AM CDTSpecial Weather StatementBMXChambers42 min
Mar 28, 12:38 PM CDTRiver Flood WarningBMXSumter57 hr

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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.