Alert archive / Alabama / Special Weather Statements in 2021

Special Weather Statement, NWS Birmingham, AL

July 13, 2021Jefferson County, Walker County, Winston County, Alabama

NWS Birmingham, AL issued this special weather statement at Jul 13, 2021, 3:03 PM CDT for Jefferson County, Walker County, Winston County, Alabama. It was in force for 42 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: Jul 13, 2021, 3:03 PM CDT (20:03 UTC)
Expired: Jul 13, 2021, 3:45 PM CDT
In force: 42 min
Issued by: NWS Birmingham, AL

Counties Jefferson County, AL, Walker County, AL, Winston County, AL

The radar

The Birmingham radar (KBMX), 86 km from the middle of the area, began a volume at 20:04 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 nearest sounding before it

Birmingham, AL (KBMX), launched 12:00Z, 8.1 hours before the alert went out and 85 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: 15 J/kg
Mixed-layer CIN: -155 J/kg
Mixed-layer LCL: 865 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: 66 m²/s²
0-3 km storm-relative helicity: 69 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

222 
WWUS84 KBMX 132003
SPSBMX

Special Weather Statement
National Weather Service Birmingham AL
303 PM CDT Tue Jul 13 2021
 
ALZ014-015-017-024-025-132045-
Walker AL-Winston AL-Jefferson AL-Shelby AL-Blount AL-
303 PM CDT Tue Jul 13 2021

...SIGNIFICANT WEATHER ADVISORY FOR EASTERN WALKER...SOUTHWESTERN
BLOUNT...NORTH CENTRAL SHELBY...JEFFERSON AND WINSTON COUNTIES UNTIL
345 PM CDT...

At 302 PM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from near Ashridge to near North Johns. Movement was
east at 25 mph.

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

Locations impacted include...
Birmingham, Hoover, Vestavia Hills, Bessemer, Homewood, Mountain
Brook, Hueytown, Jasper, Gardendale, Irondale, Fairfield, Fultondale,
Sumiton, Cordova, Dora, Arley, Center Point, Pleasant Grove, Pinson
and Tarrant.

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.

Frequent cloud to ground lightning is occurring with these storms.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 3430 8711 3399 8711 3399 8715 3392 8708
      3390 8710 3389 8701 3387 8700 3386 8696
      3387 8692 3391 8692 3392 8689 3394 8688
      3395 8679 3339 8657 3332 8716 3430 8753
TIME...MOT...LOC 2002Z 269DEG 23KT 3430 8746 3340 8712 

$$

25/Owen

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 13, 12:47 PM CDT	Special Weather Statement	BMX	Lamar, Marion	43 min
Jul 13, 1:35 PM CDT	Special Weather Statement	BMX	Fayette, Marion	40 min
Jul 13, 2:09 PM CDT	Special Weather Statement	BMX	Sumter	51 min
Jul 13, 2:26 PM CDT	Special Weather Statement	BMX	Jefferson, Walker, Winston	34 min
Jul 13, 3:01 PM CDT	Special Weather Statement	BMX	Greene, Hale	44 min
Jul 13, 3:45 PM CDT	Special Weather Statement	BMX	Blount, Jefferson	45 min
Jul 13, 3:47 PM CDT	Special Weather Statement	BMX	Hale	43 min
Jul 13, 4:35 PM CDT	Special Weather Statement	BMX	St. Clair, Talladega	40 min
Jul 13, 5:16 PM CDT	Special Weather Statement	BMX	Etowah	44 min
Jul 13, 5:28 PM CDT	Special Weather Statement	BMX	Perry	32 min

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.