Alert archive / Alabama / Special Weather Statements in 2021

Special Weather Statement, NWS Birmingham, AL

September 1, 2021Bibb County, Chilton County, Alabama

NWS Birmingham, AL issued this special weather statement at Sep 1, 2021, 2:33 PM CDT for Bibb County, Chilton 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: Sep 1, 2021, 2:33 PM CDT (19:33 UTC)
Expired: Sep 1, 2021, 3:15 PM CDT
In force: 42 min
Issued by: NWS Birmingham, AL
Hail: 0.00 in
Wind: 40

Counties Bibb County, AL, Chilton County, AL

The radar

The Birmingham radar (KBMX), 16 km from the middle of the area, began a volume at 19:35 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, 7.6 hours before the alert went out and 17 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: 170 J/kg
Mixed-layer CIN: -55 J/kg
Mixed-layer LCL: 990 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 51 m²/s²
0-3 km storm-relative helicity: 52 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

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What forecasters said that day

The local office's own words before this special weather statement went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Birmingham, AL wrote its last area forecast discussion before this special weather statement went out at Sep 1, 1:15 PM CDT, 1 hour 18 minutes earlier.

Area forecast discussion, Sep 1, 1:15 PM CDT, 1 hour 18 minutes before

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Hazardous weather outlook, Sep 1, 3:05 AM CDT, 11 hours 28 minutes before

Hazardous Weather Outlook
National Weather Service Birmingham AL
305 AM CDT Wed Sep 1 2021

ALZ011>015-017>050-021115-
Marion-Lamar-Fayette-Winston-Walker-Blount-Etowah-Calhoun-Cherokee-
Cleburne-Pickens-Tuscaloosa-Jefferson-Shelby-St. Clair-Talladega-
Clay-Randolph-Sumter-Greene-Hale-Perry-Bibb-Chilton-Coosa-Tallapoosa-
Chambers-Marengo-Dallas-Autauga-Lowndes-Elmore-Montgomery-Macon-
Bullock-Lee-Russell-Pike-Barbour-
305 AM CDT Wed Sep 1 2021

This Hazardous Weather Outlook is for the counties served by the
National Weather Service office in Birmingham.

.DAY ONE...Outlook through Tonight.

Minor flooding is forecast along portions of the Tombigbee and
Sucarnoochee Rivers today. Please see the latest flood statements
for more details.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

Minor flooding is forecast along portions of the Tombigbee and
Sucarnoochee Rivers through the end of the week. Please see the
latest flood statements for more details.

.SPOTTER INFORMATION STATEMENT...

Activation of storm spotters and emergency management is not
expected at this time.

In the hours before

Special weather statement, Sep 1, 1:05 PM CDT, 1 hour 28 minutes before

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Special weather statement, Sep 1, 1:32 PM CDT, 1 hour 1 minute before

Special Weather Statement
National Weather Service Birmingham AL
132 PM CDT Wed Sep 1 2021

ALZ023-024-011915-
Jefferson AL-Tuscaloosa AL-
132 PM CDT Wed Sep 1 2021

...Strong thunderstorms will impact portions of Tuscaloosa and
southwestern Jefferson Counties through 215 PM CDT...

At 132 PM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from near Bankhead Lock And Dam to 6 miles northeast
of Samantha to near Ashcraft Corner. Movement was southeast at 15
mph.

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...
Tuscaloosa, Hoover, Bessemer, Northport, Hueytown, Holt, Brighton,
Lake View, Brookwood, Coaling, Vance, Coker, North Johns, Bull City,
Samantha, McFarland Mall, Lake Lurleen State Park, Tuscaloosa
Amphitheater, Tuscaloosa Regional Airport and Lake Wildwood.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 3353 8756 3359 8736 3359 8732 3352 8732
      3351 8727 3353 8727 3352 8725 3355 8719
      3358 8720 3360 8718 3334 8683 3333 8689
      3325 8698 3322 8710 3323 8715 3319 8720
      3316 8720 3314 8725 3317 8784 3350 8784
TIME...MOT...LOC 1832Z 322DEG 15KT 3353 8734 3348 8751 3348 8783

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

61

Special weather statement, Sep 1, 2:08 PM CDT, 25 minutes before

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Special weather statement, Sep 1, 2:33 PM CDT, 0 minutes before

Special Weather Statement
National Weather Service Birmingham AL
233 PM CDT Wed Sep 1 2021

ALZ025-034-035-012015-
Chilton AL-Bibb AL-Shelby AL-
233 PM CDT Wed Sep 1 2021

...Strong thunderstorms will impact portions of northern Chilton,
southern Shelby and southeastern Bibb Counties through 315 PM CDT...

At 233 PM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from near Hoover Metropolitan Stadium to near Wilton
to near Coaling. Movement was southeast at 35 mph.

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...
Alabaster, Pelham, Calera, Clanton, Montevallo, Brent, Columbiana,
Centreville, Jemison, Thorsby, Maplesville, Wilton, Gap Of The
Mountain, American Village, Brierfield Ironworks Park, University Of
Montevallo, Talladega National Forest, Shelby County Airport, Lay
Lake and West Centreville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 3311 8687 3333 8680 3319 8650 3317 8650
      3313 8646 3309 8651 3307 8651 3306 8652
      3294 8651 3281 8657 3280 8702 3284 8702
      3283 8715 3304 8725
TIME...MOT...LOC 1933Z 315DEG 32KT 3332 8683 3310 8692 3310 8731

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

61

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 1, 8:03 AM CDT	Areal Flood Warning	BMX	Cherokee	14 hr
Sep 1, 1:05 PM CDT	Special Weather Statement	BMX	Lamar	40 min
Sep 1, 1:32 PM CDT	Special Weather Statement	BMX	Tuscaloosa	43 min
Sep 1, 2:08 PM CDT	Special Weather Statement	BMX	Tuscaloosa	52 min
Sep 1, 2:47 PM CDT	Special Weather Statement	BMX	Hale	58 min
Sep 1, 3:12 PM CDT	Special Weather Statement	BMX	Chilton	48 min
Sep 1, 3:15 PM CDT	Special Weather Statement	BMX	Greene	45 min
Sep 1, 3:48 PM CDT	Special Weather Statement	BMX	Autauga, Dallas, Perry	42 min
Sep 1, 4:02 PM CDT	Special Weather Statement	BMX	Sumter	43 min
Sep 1, 4:15 PM CDT	Special Weather Statement	BMX	Elmore	45 min
Sep 1, 4:18 PM CDT	Special Weather Statement	BMX	Pickens	27 min
Sep 1, 4:31 PM CDT	Special Weather Statement	BMX	Lowndes, Montgomery	44 min
Sep 1, 4:48 PM CDT	Special Weather Statement	BMX	Marengo, Sumter	42 min
Sep 1, 4:53 PM CDT	Special Weather Statement	BMX	Blount	52 min
Sep 1, 5:00 PM CDT	Special Weather Statement	BMX	Bullock, Macon	60 min
Sep 1, 5:27 PM CDT	Special Weather Statement	BMX	Marengo	33 min
Sep 1, 6:00 PM CDT	Special Weather Statement	BMX	Barbour, Bullock	60 min
Sep 1, 6:20 PM CDT	Special Weather Statement	BMX	Jefferson	40 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.