Alert archive / Alabama / Special Weather Statements in 2021

Special Weather Statement, NWS Birmingham, AL

August 9, 2021Clay County, Alabama

NWS Birmingham, AL issued this special weather statement at Aug 9, 2021, 3:48 PM CDT for Clay County, Alabama. It was in force for 27 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: Aug 9, 2021, 3:48 PM CDT (20:48 UTC)
Expired: Aug 9, 2021, 4:15 PM CDT
In force: 27 min
Issued by: NWS Birmingham, AL
Hail: 0.00 in
Wind: 40

County Clay County, AL

The radar

The Birmingham radar (KBMX), 71 km from the middle of the area, began a volume at 20:52 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, 8.8 hours before the alert went out and 72 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: 1644 J/kg
Mixed-layer CIN: -36 J/kg
Mixed-layer LCL: 893 m above ground
0-6 km bulk shear: 13 kt
0-1 km storm-relative helicity: 52 m²/s²
0-3 km storm-relative helicity: 37 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

026 
WWUS84 KBMX 092048
SPSBMX

Special Weather Statement
National Weather Service Birmingham AL
348 PM CDT Mon Aug 9 2021
 
ALZ028-092115-
Clay AL-
348 PM CDT Mon Aug 9 2021

...A strong thunderstorm will impact portions of southwestern Clay
County through 415 PM CDT...

At 348 PM CDT, Doppler radar was tracking a strong thunderstorm 8
miles northeast of Parkdale, or 8 miles north of Goodwater. This
storm was nearly stationary.

HAZARD...Winds in excess of 40 mph.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around 
         unsecured objects.

Locations impacted include...
Ashland, Cleveland Crossroads, Roselle and Millerville. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building. 

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

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

&&

LAT...LON 3328 8579 3310 8592 3311 8597 3309 8598
      3310 8601 3311 8601 3310 8603 3314 8616
      3320 8614 3319 8612 3324 8612 3330 8610
      3330 8598 3333 8598
TIME...MOT...LOC 2048Z 202DEG 3KT 3319 8601 

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...40 MPH

$$

25/Owen

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 9, 12:21 PM CDT	Special Weather Statement	BMX	Perry	24 min
Aug 9, 12:25 PM CDT	Special Weather Statement	BMX	Clay	35 min
Aug 9, 12:42 PM CDT	Special Weather Statement	BMX	Etowah	33 min
Aug 9, 1:13 PM CDT	Special Weather Statement	BMX	Bibb	32 min
Aug 9, 1:49 PM CDT	Special Weather Statement	BMX	Dallas	41 min
Aug 9, 1:51 PM CDT	Special Weather Statement	BMX	Cherokee	39 min
Aug 9, 2:05 PM CDT	Special Weather Statement	BMX	DeKalb	40 min
Aug 9, 2:28 PM CDT	Special Weather Statement	BMX	Randolph	32 min
Aug 9, 2:30 PM CDT	Special Weather Statement	BMX	Cherokee	30 min
Aug 9, 2:49 PM CDT	Special Weather Statement	BMX	Dallas	41 min
Aug 9, 3:02 PM CDT	Special Weather Statement	BMX	Chambers	28 min
Aug 9, 3:49 PM CDT	Special Weather Statement	BMX	Chambers	26 min
Aug 9, 4:00 PM CDT	Special Weather Statement	BMX	Talladega	30 min
Aug 9, 4:21 PM CDT	Special Weather Statement	BMX	Talladega	24 min
Aug 9, 4:44 PM CDT	Severe Thunderstorm Warning	BMX	Talladega	31 min
Aug 9, 5:21 PM CDT	Special Weather Statement	BMX	Calhoun	39 min
Aug 9, 5:56 PM CDT	Special Weather Statement	BMX	Elmore	34 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.