Alert archive / Alabama / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 40, NWS Birmingham, AL

March 31, 2021Marengo County, Alabama

NWS Birmingham, AL issued this severe thunderstorm warning at Mar 31, 2021, 1:33 PM CDT for Marengo County, Alabama. It was in force for 57 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 31, 2021, 1:33 PM CDT (18:33 UTC)
Expired: Mar 31, 2021, 2:30 PM CDT
In force: 57 min
Issued by: NWS Birmingham, AL
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Marengo County, AL

The radar

The Mobile radar (KMOB), 156 km from the middle of the area, began a volume at 18:33 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 31, 11:19 AM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Birmingham, AL (KBMX), launched 12:00Z, 6.6 hours before the alert went out and 165 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: 455 J/kg
Mixed-layer CIN: -3 J/kg
Mixed-layer LCL: 527 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 273 m²/s²
0-3 km storm-relative helicity: 283 m²/s²
Significant tornado parameter: 0.6
Supercell composite: 3.5

Open this sounding in Storm Lab

The text

As transmitted.

250 
WUUS54 KBMX 311833
SVRBMX
ALC091-311930-
/O.NEW.KBMX.SV.W.0040.210331T1833Z-210331T1930Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Birmingham AL
133 PM CDT Wed Mar 31 2021

The National Weather Service in Birmingham has issued a

* Severe Thunderstorm Warning for...
  Southern Marengo County in southwestern Alabama...

* Until 230 PM CDT.

* At 133 PM CDT, a severe thunderstorm was located near Toxey, or 9
  miles southwest of Butler, moving east at 40 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...
  Sweet Water, Putnam, Wayne, Surginer, Shawnee, Nanafalia, Dixons
  Mill, Magnolia, Vineland, Clayhill and Nicholsville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3206 8812 3207 8809 3206 8807 3208 8804
      3211 8805 3213 8804 3218 8752 3213 8752
      3213 8762 3201 8762 3200 8767 3199 8767
      3199 8807 3201 8809 3200 8809 3200 8811
      3201 8812
TIME...MOT...LOC 1833Z 272DEG 36KT 3196 8829 

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

17/KLAWS

1 follow-up statement

055 
WWUS54 KBMX 311920
SVSBMX

Severe Weather Statement
National Weather Service Birmingham AL
220 PM CDT Wed Mar 31 2021

ALC091-311930-
/O.EXP.KBMX.SV.W.0040.000000T0000Z-210331T1930Z/
Marengo AL-
220 PM CDT Wed Mar 31 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN MARENGO COUNTY WILL
EXPIRE AT 230 PM 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 500 PM CDT for
southwestern Alabama.

LAT...LON 3206 8812 3207 8809 3206 8807 3208 8804
      3211 8805 3213 8804 3218 8752 3213 8752
      3213 8762 3201 8762 3200 8767 3199 8767
      3199 8807 3201 8809 3200 8809 3200 8811
      3201 8812
TIME...MOT...LOC 1920Z 272DEG 36KT 3194 8774 

$$

17/KLAWS

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 30, 8:53 PM CDT	River Flood Warning	BMX	Greene, Marengo, Sumter	3 days
Mar 31, 2:10 AM CDT	Tornado Warning	BMX	Lamar, Marion	15 min
Mar 31, 4:38 AM CDT	Flash Flood Warning	BMX	Fayette, Lamar, Marion, Walker, Winston	4 hr
Mar 31, 5:56 AM CDT	Special Weather Statement	BMX	Fayette, Lamar, Marion	64 min
Mar 31, 6:54 AM CDT	Special Weather Statement	BMX	Winston	51 min
Mar 31, 7:06 AM CDT	Special Weather Statement	BMX	Walker	54 min
Mar 31, 7:11 AM CDT	Flash Flood Warning	BMX	Blount, Walker, Winston	6 hr
Mar 31, 7:51 AM CDT	Special Weather Statement	BMX	Blount	54 min
Mar 31, 8:42 AM CDT	Flash Flood Warning	BMX	Jefferson, Pickens, Tuscaloosa	3 hr
Mar 31, 9:32 AM CDT	Flash Flood Warning	BMX	Bibb, Shelby	3 hr
Mar 31, 9:38 AM CDT	Special Weather Statement	BMX	Cleburne	52 min
Mar 31, 9:41 AM CDT	Special Weather Statement	BMX	Tuscaloosa	49 min
Mar 31, 10:12 AM CDT	Areal Flood Advisory	BMX	Etowah	2 hr
Mar 31, 10:22 AM CDT	Special Weather Statement	BMX	Bibb	38 min
Mar 31, 10:53 AM CDT	Special Weather Statement	BMX	Sumter	37 min
Mar 31, 10:56 AM CDT	Flash Flood Warning	BMX	Etowah	3 hr
Mar 31, 11:02 AM CDT	Severe Thunderstorm Warning	BMX	Sumter	43 min
Mar 31, 11:23 AM CDT	Severe Thunderstorm Warning	BMX	Greene	15 min
Mar 31, 11:49 AM CDT	Areal Flood Advisory	BMX	Jefferson, St. Clair, Tuscaloosa	3 hr
Mar 31, 12:09 PM CDT	Areal Flood Advisory	BMX	Bibb, Shelby	111 min
Mar 31, 12:56 PM CDT	Special Weather Statement	BMX	Marengo	49 min
Mar 31, 12:57 PM CDT	Areal Flood Warning	BMX	Cherokee	24 hr
Mar 31, 1:07 PM CDT	River Flood Warning	BMX	Calhoun, Cherokee, Etowah, St. Clair	67 hr
Mar 31, 1:13 PM CDT	Severe Thunderstorm Warning	BMX	Marengo	14 min
Mar 31, 1:38 PM CDT	Areal Flood Warning	BMX	Blount, Walker, Winston	6 hr
Mar 31, 1:55 PM CDT	Special Weather Statement	BMX	Montgomery	35 min
Mar 31, 2:01 PM CDT	Areal Flood Advisory	BMX	Etowah	4 hr
Mar 31, 2:33 PM CDT	Special Weather Statement	BMX	Lowndes	27 min
Mar 31, 2:40 PM CDT	Freeze Watch	BMX	Autauga, Barbour, Bibb, Blount, Bullock, Calhoun and 33 more	13 hr
Mar 31, 2:58 PM CDT	River Flood Warning	BMX	Jefferson, Tuscaloosa, Walker	42 hr
Mar 31, 4:01 PM CDT	Special Weather Statement	BMX	Pike	44 min
Mar 31, 4:11 PM CDT	Areal Flood Advisory	BMX	Pike	2 hr
Mar 31, 6:04 PM CDT	Wind Advisory	BMX	Autauga, Barbour, Bibb, Blount, Bullock, Calhoun and 33 more	24 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.