Alert archive / Alabama / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 148, NWS Birmingham, AL

August 25, 2021Shelby County, Alabama

NWS Birmingham, AL issued this severe thunderstorm warning at Aug 25, 2021, 5:59 PM CDT for Shelby County, Alabama. It was in force for 31 min. 2 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Aug 25, 2021, 5:59 PM CDT (22:59 UTC)
Expired: Aug 25, 2021, 6:30 PM CDT
In force: 31 min
Issued by: NWS Birmingham, AL
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

County Shelby County, AL

The radar

The Birmingham radar (KBMX), 10 km from the middle of the area, began a volume at 23:03 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.

What was reported inside it

Time	Report	Where	Remark
Aug 25, 5:59 PM CDT	TSTM WND DMG	3 S Oak Mountain Lake, AL	CORRECTS PREVIOUS TSTM WND DMG REPORT FROM 3 S OAK MOUNTAIN LAKE. TREE DOWN NEAR THE INTERSECTION OF SMITH RD AND HWY 11. TIME ESTIMATED.
Aug 25, 6:03 PM CDT	TSTM WND DMG	1 Sse Oak Mountain Stat, AL	A FEW TREES WERE BLOWN DOWN IN PELHAM.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Birmingham, AL (KBMX), launched 12:00Z, 11.0 hours before the alert went out and 9 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: 1212 J/kg
Mixed-layer CIN: -48 J/kg
Mixed-layer LCL: 1048 m above ground
0-6 km bulk shear: 8 kt
0-1 km storm-relative helicity: 0 m²/s²
0-3 km storm-relative helicity: 12 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

907 
WUUS54 KBMX 252259
SVRBMX
ALC117-252330-
/O.NEW.KBMX.SV.W.0148.210825T2259Z-210825T2330Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Birmingham AL
559 PM CDT Wed Aug 25 2021

The National Weather Service in Birmingham has issued a

* Severe Thunderstorm Warning for...
  Central Shelby County in central Alabama...

* Until 630 PM CDT.

* At 559 PM CDT, severe thunderstorms were located along a line
  extending from Oak Mountain Amphitheater to near Chelsea to near
  Columbiana, moving southwest at 25 mph.

  HAZARD...60 mph wind gusts and penny size hail.

  SOURCE...Radar indicated.

  IMPACT...Expect damage to roofs, siding, and trees.

* Locations impacted include...
  Hoover, Alabaster, Pelham, Helena, Calera, Chelsea, Montevallo,
  Indian Springs Village, American Village, Oak Mountain State Park,
  Maylene, Oak Mountain Amphitheater, Highland Lakes, Riverchase,
  Shelby County Airport, Meadowbrook, Joe Tucker Park, Camp Branch,
  Hoover Veterans Park and Siluria.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

To report severe weather, contact your nearest law enforcement
agency. They will send your report to the National Weather Service
office in Birmingham.

&&

LAT...LON 3322 8658 3310 8688 3324 8698 3335 8681
      3343 8665
TIME...MOT...LOC 2259Z 067DEG 22KT 3333 8678 3333 8669 3319 8668 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

75 Linhares

1 follow-up statement

125 
WWUS54 KBMX 252321
SVSBMX

Severe Weather Statement
National Weather Service Birmingham AL
621 PM CDT Wed Aug 25 2021

ALC117-252330-
/O.EXP.KBMX.SV.W.0148.000000T0000Z-210825T2330Z/
Shelby AL-
621 PM CDT Wed Aug 25 2021

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL SHELBY COUNTY WILL
EXPIRE AT 630 PM CDT...
            
The storms which prompted the warning have weakened below severe
limits, and no longer pose an immediate threat to life or property.
Therefore, the warning will be allowed to expire.

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
Birmingham.

LAT...LON 3322 8658 3310 8688 3324 8698 3335 8681
      3343 8665
TIME...MOT...LOC 2320Z 067DEG 22KT 3328 8691 3328 8682 3314 8681 

$$

40/Sizemore

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 25, 3:01 PM CDT	Special Weather Statement	BMX	Lee	29 min
Aug 25, 3:37 PM CDT	Special Weather Statement	BMX	Macon	23 min
Aug 25, 4:00 PM CDT	Special Weather Statement	BMX	Elmore	30 min
Aug 25, 4:08 PM CDT	Special Weather Statement	BMX	Marion	37 min
Aug 25, 4:39 PM CDT	Special Weather Statement	BMX	Chambers	51 min
Aug 25, 4:45 PM CDT	Special Weather Statement	BMX	Russell	45 min
Aug 25, 4:53 PM CDT	Severe Thunderstorm Warning	BMX	Russell	37 min
Aug 25, 4:56 PM CDT	Special Weather Statement	BMX	Talladega	34 min
Aug 25, 5:05 PM CDT	Special Weather Statement	BMX	Lee	25 min
Aug 25, 5:23 PM CDT	Severe Thunderstorm Warning	BMX	Bullock, Macon, Russell	29 min
Aug 25, 5:33 PM CDT	Special Weather Statement	BMX	Lee	42 min
Aug 25, 5:33 PM CDT	Special Weather Statement	BMX	Shelby	27 min
Aug 25, 5:40 PM CDT	Severe Thunderstorm Warning	BMX	Lee	24 min
Aug 25, 5:53 PM CDT	Special Weather Statement	BMX	Shelby	52 min
Aug 25, 6:05 PM CDT	Special Weather Statement	BMX	Macon, Montgomery	25 min
Aug 25, 6:14 PM CDT	Special Weather Statement	BMX	Shelby	31 min
Aug 25, 6:31 PM CDT	Special Weather Statement	BMX	Lowndes	44 min
Aug 25, 6:36 PM CDT	Special Weather Statement	BMX	Randolph	39 min
Aug 25, 6:42 PM CDT	Special Weather Statement	BMX	Jefferson	33 min
Aug 25, 6:54 PM CDT	Special Weather Statement	BMX	Bibb	36 min

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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.