Alert archive / Alabama / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 26, NWS Birmingham, AL

March 27, 2021Jefferson County, Alabama

NWS Birmingham, AL issued this severe thunderstorm warning at Mar 27, 2021, 5:06 PM CDT for Jefferson County, Alabama. It was in force for 39 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 27, 2021, 5:06 PM CDT (22:06 UTC)
Expired: Mar 27, 2021, 5:45 PM CDT
In force: 39 min
Issued by: NWS Birmingham, AL
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Jefferson County, AL

The radar

The Birmingham radar (KBMX), 63 km from the middle of the area, began a volume at 22:09 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
Mar 27, 5:12 PM CDT	HAIL 1	3 Ssw Morris, AL	QUARTER SIZE HAIL SOUTH OF MORRIS.

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, 10.1 hours before the alert went out and 63 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: 1085 J/kg
Mixed-layer CIN: -47 J/kg
Mixed-layer LCL: 610 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 164 m²/s²
0-3 km storm-relative helicity: 219 m²/s²
Significant tornado parameter: 1.0
Supercell composite: 5.2

Open this sounding in Storm Lab

The text

As transmitted.

258 
WUUS54 KBMX 272206
SVRBMX
ALC073-272245-
/O.NEW.KBMX.SV.W.0026.210327T2206Z-210327T2245Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Birmingham AL
506 PM CDT Sat Mar 27 2021

The National Weather Service in Birmingham has issued a

* Severe Thunderstorm Warning for...
  Northeastern Jefferson County in central Alabama...

* Until 545 PM CDT.

* At 506 PM CDT, a severe thunderstorm was located near Brookside, or
  near Gardendale, moving northeast at 30 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, Center
  Point, Clay, Pinson, Tarrant, Argo, Kimberly, Morris, Brookside,
  Chalkville, Grayson Valley, Palmerdale, Village Springs and New
  Castle.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3378 8665 3377 8665 3377 8664 3376 8656
      3370 8652 3366 8653 3360 8689 3372 8692
      3381 8670
TIME...MOT...LOC 2206Z 246DEG 26KT 3367 8688 

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

32/Davis

2 follow-up statements

196 
WWUS54 KBMX 272220
SVSBMX

Severe Weather Statement
National Weather Service Birmingham AL
520 PM CDT Sat Mar 27 2021

ALC073-272245-
/O.CON.KBMX.SV.W.0026.000000T0000Z-210327T2245Z/
Jefferson AL-
520 PM CDT Sat Mar 27 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 545 PM CDT
FOR NORTHEASTERN JEFFERSON COUNTY...

At 520 PM CDT, a severe thunderstorm was located near Morris, or near
Gardendale, moving northeast at 30 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, Trussville, Gardendale, Fultondale, Center
Point, Clay, Pinson, Tarrant, Argo, Kimberly, Morris, Chalkville,
Grayson Valley, Palmerdale, Village Springs and New Castle.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3378 8665 3377 8665 3377 8664 3376 8656
      3370 8652 3366 8653 3361 8681 3374 8683
      3379 8671
TIME...MOT...LOC 2220Z 246DEG 26KT 3371 8677 

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

32/Davis

230 
WWUS54 KBMX 272237
SVSBMX

Severe Weather Statement
National Weather Service Birmingham AL
537 PM CDT Sat Mar 27 2021

ALC073-272245-
/O.CON.KBMX.SV.W.0026.000000T0000Z-210327T2245Z/
Jefferson AL-
537 PM CDT Sat Mar 27 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 545 PM CDT
FOR NORTHEASTERN JEFFERSON COUNTY...

At 537 PM CDT, a severe thunderstorm was located over Clay, or near
Trussville, moving east at 30 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...
Trussville, Center Point, Clay, Pinson, Argo, 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.

&&

LAT...LON 3378 8665 3377 8665 3377 8664 3376 8656
      3370 8652 3366 8653 3364 8669 3373 8670
      3378 8666
TIME...MOT...LOC 2237Z 251DEG 26KT 3373 8661 

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

32/Davis

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 27, 3:51 PM CDT	Special Weather Statement	BMX	Walker	24 min
Mar 27, 4:10 PM CDT	Special Weather Statement	BMX	Jefferson	50 min
Mar 27, 4:25 PM CDT	Severe Thunderstorm Warning	BMX	Jefferson, Walker	50 min
Mar 27, 4:37 PM CDT	Special Weather Statement	BMX	Lamar	53 min
Mar 27, 5:10 PM CDT	Severe Thunderstorm Warning	BMX	Pickens	65 min
Mar 27, 5:39 PM CDT	Severe Thunderstorm Warning	BMX	Lamar	36 min
Mar 27, 5:44 PM CDT	Special Weather Statement	BMX	St. Clair	61 min
Mar 27, 5:59 PM CDT	Severe Thunderstorm Warning	BMX	Fayette, Pickens	46 min
Mar 27, 6:06 PM CDT	Special Weather Statement	BMX	Jefferson	24 min
Mar 27, 6:40 PM CDT	Special Weather Statement	BMX	Etowah	65 min
Mar 27, 6:46 PM CDT	Special Weather Statement	BMX	Fayette	29 min
Mar 27, 6:56 PM CDT	Special Weather Statement	BMX	Walker	64 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.