Alert archive / Alabama / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 11, NWS Birmingham, AL

March 17, 2021St. Clair County, Shelby County, Talladega County, Alabama

NWS Birmingham, AL issued this severe thunderstorm warning at Mar 17, 2021, 10:06 PM CDT for St. Clair County, Shelby County, Talladega County, Alabama. It was in force for 69 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 17, 2021, 10:06 PM CDT (03:06 UTC)
Expired
Mar 17, 2021, 11:15 PM CDT
In force
69 min
Issued by
NWS Birmingham, AL
Area
Storm-based polygon
Hail
0.75 in
Wind
60.0 mph

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

The radar

The Birmingham radar (KBMX), 57 km from the middle of the area, began a volume at 03:04 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.

IssuedProductOfficeLasted
Mar 17, 6:48 PM CDTTornado Watch PDSSPC8 hr

The nearest sounding before it

Birmingham, AL (KBMX), launched 00:00Z, 3.1 hours before the alert went out and 58 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 00:00Z on 2021-03-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 188 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 00:00Z on 2021-03-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 336 square meters per square second.19395878Sfc1 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
188 J/kg
Mixed-layer CIN
-25 J/kg
Mixed-layer LCL
669 m above ground
0-6 km bulk shear
63 kt
0-1 km storm-relative helicity
336 m²/s²
0-3 km storm-relative helicity
465 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.6

Open this sounding in Storm Lab

The text

As transmitted.

135 
WUUS54 KBMX 180306
SVRBMX
ALC115-117-121-180415-
/O.NEW.KBMX.SV.W.0011.210318T0306Z-210318T0415Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Birmingham AL
1006 PM CDT Wed Mar 17 2021

The National Weather Service in Birmingham has issued a

* Severe Thunderstorm Warning for...
  Talladega County in east central Alabama...
  Shelby County in central Alabama...
  Southern St. Clair County in central Alabama...

* Until 1115 PM CDT.

* At 1006 PM CDT, severe thunderstorms were located along a line
  extending from near Leeds to near Columbiana, moving east at 50
  mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Oxford, Talladega, Sylacauga, Pell City, Leeds, Moody, Calera,
  Chelsea, Childersburg, Columbiana, Wilsonville, Talladega Springs,
  Lincoln, Riverside, Vincent, Harpersville, Munford, Westover, Waldo
  and Alpine Bay Resort.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 300 AM CDT for central and
east central Alabama.

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

&&

LAT...LON 3350 8585 3350 8590 3340 8592 3338 8598
      3330 8598 3329 8612 3319 8612 3320 8617
      3310 8618 3310 8649 3302 8655 3307 8661
      3307 8675 3347 8666 3353 8652 3358 8655
      3370 8615 3367 8605 3359 8599 3357 8580
TIME...MOT...LOC 0306Z 247DEG 41KT 3358 8655 3310 8663 

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

87/GRANTHAM
6 follow-up statements
791 
WWUS54 KBMX 180311
SVSBMX

Severe Weather Statement
National Weather Service Birmingham AL
1011 PM CDT Wed Mar 17 2021

ALC115-117-121-180415-
/O.CON.KBMX.SV.W.0011.000000T0000Z-210318T0415Z/
Talladega AL-Shelby AL-St. Clair AL-
1011 PM CDT Wed Mar 17 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1115 PM CDT
FOR TALLADEGA...EASTERN SHELBY AND SOUTHERN ST. CLAIR COUNTIES...

At 1011 PM CDT, severe thunderstorms were located along a line
extending from Moody to near Columbiana, moving northeast at 45 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

Locations impacted include...
Oxford, Talladega, Sylacauga, Pell City, Leeds, Moody, Calera,
Childersburg, Columbiana, Wilsonville, Talladega Springs, Lincoln,
Riverside, Vincent, Harpersville, Munford, Westover, Waldo, Alpine
Bay Resort and Talladega Superspeedway.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 300 AM CDT for central and
east central Alabama.

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

&&

LAT...LON 3350 8585 3350 8590 3338 8598 3330 8598
      3329 8612 3319 8612 3320 8617 3310 8618
      3310 8649 3302 8655 3307 8661 3307 8675
      3337 8657 3351 8656 3353 8652 3358 8655
      3370 8615 3367 8605 3359 8599 3357 8580
TIME...MOT...LOC 0311Z 247DEG 41KT 3360 8651 3312 8659 

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

87/GRANTHAM
383 
WWUS54 KBMX 180323
SVSBMX

Severe Weather Statement
National Weather Service Birmingham AL
1023 PM CDT Wed Mar 17 2021

ALC115-117-121-180415-
/O.CON.KBMX.SV.W.0011.000000T0000Z-210318T0415Z/
Talladega AL-Shelby AL-St. Clair AL-
1023 PM CDT Wed Mar 17 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1115 PM CDT
FOR TALLADEGA...EASTERN SHELBY AND SOUTHEASTERN ST. CLAIR COUNTIES...

At 1023 PM CDT, severe thunderstorms were located along a line
extending from near Odenville to Alpine Bay Resort to near Talladega
Springs, moving northeast at 55 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

Locations impacted include...
Oxford, Talladega, Sylacauga, Pell City, Childersburg, Wilsonville,
Talladega Springs, Lincoln, Riverside, Vincent, Harpersville,
Munford, Waldo, Alpine Bay Resort, Talladega Superspeedway, Talladega
Municipal Airport, Grant Town, Alpine, Coosa Island and Logan Martin
Dam.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 300 AM CDT for central and
east central Alabama.

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

&&

LAT...LON 3305 8658 3340 8642 3362 8640 3370 8615
      3367 8605 3359 8599 3357 8580 3350 8585
      3350 8590 3338 8598 3330 8598 3329 8612
      3319 8612 3320 8617 3310 8618 3310 8649
      3302 8655
TIME...MOT...LOC 0323Z 244DEG 49KT 3364 8632 3344 8628 3313 8648 

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

87/GRANTHAM
183 
WWUS54 KBMX 180331
SVSBMX

Severe Weather Statement
National Weather Service Birmingham AL
1031 PM CDT Wed Mar 17 2021

ALC117-180341-
/O.CAN.KBMX.SV.W.0011.000000T0000Z-210318T0415Z/
Shelby AL-
1031 PM CDT Wed Mar 17 2021

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN SHELBY COUNTY IS
CANCELLED...

The storms which prompted the warning have moved out of the warned 
area. Therefore, the warning has been cancelled.

A Tornado Watch remains in effect until 300 AM CDT for central and
east central Alabama.

LAT...LON 3350 8585 3350 8590 3338 8598 3330 8598
      3329 8612 3319 8612 3320 8617 3310 8618
      3310 8648 3327 8641 3329 8636 3334 8637
      3335 8634 3338 8637 3363 8637 3370 8615
      3368 8614 3367 8605 3359 8599 3357 8580
TIME...MOT...LOC 0331Z 247DEG 41KT 3367 8622 3347 8618 3316 8638 

$$

ALC115-121-180415-
/O.CON.KBMX.SV.W.0011.000000T0000Z-210318T0415Z/
Talladega AL-St. Clair AL-
1031 PM CDT Wed Mar 17 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1115 PM CDT
FOR TALLADEGA AND SOUTHEASTERN ST. CLAIR COUNTIES...

At 1031 PM CDT, severe thunderstorms were located along a line
extending from near Riverside to near Logan Martin Lake to
Fayetteville, moving northeast at 45 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

Locations impacted include...
Oxford, Talladega, Sylacauga, Pell City, Childersburg, Talladega
Springs, Lincoln, Riverside, Munford, Waldo, Alpine Bay Resort,
Winterboro, Talladega Superspeedway, Talladega Municipal Airport,
Fayetteville, Grant Town, Alpine, Logan Martin Lake, Honda
Manufacturing Of Alabama and Sycamore.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 300 AM CDT for central and
east central Alabama.

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

&&

LAT...LON 3350 8585 3350 8590 3338 8598 3330 8598
      3329 8612 3319 8612 3320 8617 3310 8618
      3310 8648 3327 8641 3329 8636 3334 8637
      3335 8634 3338 8637 3363 8637 3370 8615
      3368 8614 3367 8605 3359 8599 3357 8580
TIME...MOT...LOC 0331Z 247DEG 41KT 3367 8622 3347 8618 3316 8638 

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

87/GRANTHAM
592 
WWUS54 KBMX 180341
SVSBMX

Severe Weather Statement
National Weather Service Birmingham AL
1041 PM CDT Wed Mar 17 2021

ALC115-180351-
/O.CAN.KBMX.SV.W.0011.000000T0000Z-210318T0415Z/
St. Clair AL-
1041 PM CDT Wed Mar 17 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN ST. CLAIR COUNTY
IS CANCELLED...

The storms which prompted the warning have weakened. moved out of 
the warned area. Therefore, the warning has been cancelled.

A Tornado Watch remains in effect until 300 AM CDT for central and
east central Alabama.

LAT...LON 3350 8585 3350 8590 3338 8598 3337 8598
      3332 8625 3348 8619 3362 8618 3362 8617
      3369 8618 3369 8617 3367 8616 3368 8614
      3367 8605 3364 8603 3360 8602 3360 8600
      3359 8599 3357 8580
TIME...MOT...LOC 0341Z 246DEG 41KT 3371 8610 3351 8606 3336 8613 

$$

ALC121-180415-
/O.CON.KBMX.SV.W.0011.000000T0000Z-210318T0415Z/
Talladega AL-
1041 PM CDT Wed Mar 17 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1115 PM CDT
FOR NORTHEASTERN TALLADEGA COUNTY...

At 1041 PM CDT, severe thunderstorms were located along a line
extending from near Ragland to near Talladega Superspeedway to near
Winterboro, moving northeast at 45 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

Locations impacted include...
Oxford, Talladega, Lincoln, Munford, Waldo, Grant Town, Alpine,
Talladega Superspeedway, Honda Manufacturing Of Alabama, Talladega
Municipal Airport, Logan Martin Lake, Camp Mac, Jackson Shoals,
Ironaton, Jenifer, Howells Cove and Eastaboga.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 300 AM CDT for central and
east central Alabama.

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

&&

LAT...LON 3350 8585 3350 8590 3338 8598 3337 8598
      3332 8625 3348 8619 3362 8618 3362 8617
      3369 8618 3369 8617 3367 8616 3368 8614
      3367 8605 3364 8603 3360 8602 3360 8600
      3359 8599 3357 8580
TIME...MOT...LOC 0341Z 246DEG 41KT 3371 8610 3351 8606 3336 8613 

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

87/GRANTHAM
441 
WWUS54 KBMX 180352
SVSBMX

Severe Weather Statement
National Weather Service Birmingham AL
1052 PM CDT Wed Mar 17 2021

ALC121-180415-
/O.CON.KBMX.SV.W.0011.000000T0000Z-210318T0415Z/
Talladega AL-
1052 PM CDT Wed Mar 17 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1115 PM CDT
FOR NORTHEASTERN TALLADEGA COUNTY...

At 1052 PM CDT, severe thunderstorms were located along a line
extending from near Ohatchee to Grant Town to near Munford, moving
northeast at 45 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

Locations impacted include...
Oxford, Munford, Grant Town, Jenifer and Camp Mac. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 300 AM CDT for east central
Alabama.

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

&&

LAT...LON 3345 8593 3344 8602 3353 8599 3360 8601
      3360 8600 3359 8599 3357 8580 3350 8585
      3350 8590
TIME...MOT...LOC 0352Z 246DEG 41KT 3376 8597 3356 8593 3347 8596 

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

87/GRANTHAM
704 
WWUS54 KBMX 180409
SVSBMX

Severe Weather Statement
National Weather Service Birmingham AL
1109 PM CDT Wed Mar 17 2021

ALC121-180419-
/O.EXP.KBMX.SV.W.0011.000000T0000Z-210318T0415Z/
Talladega AL-
1109 PM CDT Wed Mar 17 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN TALLADEGA COUNTY
WILL EXPIRE AT 1115 PM CDT...
    
The storms which prompted the warning have moved out of the area.
Therefore, the warning will be allowed to expire.

A Tornado Watch remains in effect until 300 AM CDT for east central
Alabama.

LAT...LON 3345 8593 3344 8602 3353 8599 3360 8601
      3360 8600 3359 8599 3357 8580 3350 8585
      3350 8590
TIME...MOT...LOC 0409Z 247DEG 41KT 3383 8576 3363 8572 3354 8575 

$$

87/GRANTHAM

The office that day

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

IssuedProductOfficeCountiesLasted
Mar 17, 7:18 PM CDTTornado WarningBMXAutauga, Dallas17 min
Mar 17, 7:47 PM CDTSevere Thunderstorm WarningBMXFayette, Lamar, Marion58 min
Mar 17, 8:01 PM CDTTornado WarningBMXGreene, Pickens, Sumter22 min
Mar 17, 8:15 PM CDTSevere Thunderstorm WarningBMXAutauga39 min
Mar 17, 8:32 PM CDTTornado WarningBMXAutauga, Chilton, Elmore19 min
Mar 17, 9:06 PM CDTRiver Flood WarningBMXGreene, Hale, Marengo, Tuscaloosa33 hr
Mar 17, 9:14 PM CDTRiver Flood WarningBMXSumter37 hr
Mar 17, 9:18 PM CDTRiver Flood WarningBMXGreene, Hale, Marengo, Sumter72 hr
Mar 17, 9:48 PM CDTAreal Flood AdvisoryBMXBlount3 hr
Mar 17, 9:51 PM CDTSevere Thunderstorm WarningBMXAutauga, Chilton, Coosa, Elmore, Lowndes, Montgomery69 min
Mar 17, 10:22 PM CDTSevere Thunderstorm WarningBMXCalhoun, Cherokee, Etowah, St. Clair68 min
Mar 17, 10:26 PM CDTAreal Flood AdvisoryBMXCalhoun, Cherokee, Cleburne, Etowah, St. Clair, Talladega3 hr
Mar 17, 10:30 PM CDTSevere Thunderstorm WarningBMXBullock, Lee, Macon, Tallapoosa75 min
Mar 17, 10:43 PM CDTTornado WarningBMXCoosa6 min
Mar 17, 11:34 PM CDTSpecial Weather StatementBMXLee, Russell41 min
Mar 18, 2:46 AM CDTSpecial Weather StatementBMXRussell44 min
Mar 18, 3:06 AM CDTWind AdvisoryBMXAutauga, Barbour, Bibb, Blount, Bullock, Calhoun and 33 more16 hr
Mar 18, 8:31 AM CDTAreal Flood WarningBMXCherokee55 hr
Mar 18, 9:50 AM CDTRiver Flood WarningBMXJefferson, Tuscaloosa, Walker36 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.