Alert archive / Alabama / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 38, NWS Birmingham, AL

March 31, 2021Greene County, Alabama

NWS Birmingham, AL issued this severe thunderstorm warning at Mar 31, 2021, 11:23 AM CDT for Greene County, Alabama. It was in force for 15 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, 11:23 AM CDT (16:23 UTC)
Expired: Mar 31, 2021, 11:38 AM CDT
In force: 15 min
Issued by: NWS Birmingham, AL
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Greene County, AL

The radar

The Birmingham radar (KBMX), 120 km from the middle of the area, began a volume at 16:24 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, 4.4 hours before the alert went out and 120 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.

140 
WUUS54 KBMX 311623
SVRBMX
ALC063-311700-
/O.NEW.KBMX.SV.W.0038.210331T1623Z-210331T1700Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Birmingham AL
1123 AM CDT Wed Mar 31 2021

The National Weather Service in Birmingham has issued a

* Severe Thunderstorm Warning for...
  Southern Greene County in west central Alabama...

* Until noon CDT.

* At 1122 AM CDT, a severe thunderstorm was located near Bluffport,
  or near Livingston, moving east at 45 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...
  Forkland, Boligee, Thornhill, Walden Quarters, Tishabee, Five
  Points Intersection and Birdine.

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 3272 8808 3276 8811 3281 8782 3276 8787
      3275 8781 3271 8783 3271 8780 3266 8779
      3264 8775 3264 8781 3262 8781 3259 8774
      3257 8788 3260 8790 3261 8784 3263 8792
      3259 8806 3263 8808 3269 8804 3269 8811
TIME...MOT...LOC 1622Z 269DEG 38KT 3263 8814 

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

86/Martin

1 follow-up statement

606 
WWUS54 KBMX 311638
SVSBMX

Severe Weather Statement
National Weather Service Birmingham AL
1138 AM CDT Wed Mar 31 2021

ALC063-311648-
/O.CAN.KBMX.SV.W.0038.000000T0000Z-210331T1700Z/
Greene AL-
1138 AM CDT Wed Mar 31 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN GREENE COUNTY IS
CANCELLED...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning has been cancelled.  However heavy rain is
still possible with this thunderstorm.

A Severe Thunderstorm Watch remains in effect until 500 PM CDT for
west central Alabama.

LAT...LON 3272 8808 3276 8811 3281 8782 3276 8787
      3275 8781 3271 8783 3271 8780 3266 8779
      3264 8775 3264 8781 3262 8781 3259 8774
      3257 8788 3260 8790 3261 8784 3263 8792
      3259 8806 3263 8808 3269 8804 3269 8811
TIME...MOT...LOC 1637Z 269DEG 38KT 3263 8794 

$$

86/Martin

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, 11:49 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, 1:33 PM CDT	Severe Thunderstorm Warning	BMX	Marengo	57 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.