Alert archive / Alabama / Special Weather Statements in 2021

Special Weather Statement, NWS Birmingham, AL

March 31, 2021Walker County, Alabama

NWS Birmingham, AL issued this special weather statement at Mar 31, 2021, 7:06 AM CDT for Walker County, Alabama. It was in force for 54 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, 7:06 AM CDT (12:06 UTC)
Expired: Mar 31, 2021, 8:00 AM CDT
In force: 54 min
Issued by: NWS Birmingham, AL

County Walker County, AL

The radar

The Birmingham radar (KBMX), 79 km from the middle of the area, began a volume at 12:08 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 nearest sounding before it

Birmingham, AL (KBMX), launched 12:00Z, 0.1 hours before the alert went out and 78 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.

035 
WWUS84 KBMX 311206
SPSBMX

Special Weather Statement
National Weather Service Birmingham AL
706 AM CDT Wed Mar 31 2021
 
ALZ013-015-311300-
Fayette AL-Walker AL-
706 AM CDT Wed Mar 31 2021

...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL WALKER AND NORTHERN
FAYETTE COUNTIES UNTIL 800 AM CDT...

At 706 AM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from near Kansas to near Fayette. Movement was east
at 45 mph.

Winds in excess of 40 mph will be possible with these storms.

Locations impacted include...
Jasper, Sumiton, Cordova, Dora, Carbon Hill, Parrish, Sipsey, Rocky
Hollow, Beloit, Lynns Park, Empire, Cedrum Area, Fowlers Crossroads,
Holly Grove, Gamble, Townley and Boldo.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with these storms, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

&&

LAT...LON 3374 8792 3387 8763 3389 8709 3389 8701
      3387 8700 3386 8697 3384 8695 3380 8695
      3380 8697 3379 8697 3379 8700 3377 8701
      3377 8702 3375 8702 3373 8703
TIME...MOT...LOC 1206Z 270DEG 38KT 3387 8761 3375 8787 

$$

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, 7:11 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, 1:33 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

Special Weather Statements in Alabama, 2021 Every special weather statement 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.