Alert archive / Alabama / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 130, NWS Birmingham, AL

July 9, 2021Jefferson County, Alabama

NWS Birmingham, AL issued this severe thunderstorm warning at Jul 9, 2021, 7:41 PM CDT for Jefferson County, Alabama. It was in force for 21 min. 1 report 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: Jul 9, 2021, 7:41 PM CDT (00:41 UTC)
Expired: Jul 9, 2021, 8:02 PM CDT
In force: 21 min
Issued by: NWS Birmingham, AL
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Jefferson County, AL

The radar

The Birmingham radar (KBMX), 24 km from the middle of the area, began a volume at 00:43 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
Jul 9, 7:42 PM CDT	TSTM WND DMG	1 E Riverchase Galleria, AL	TREES DOWN NEAR RIME VILLAGE.

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 00:00Z, 0.7 hours before the alert went out and 22 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: 2426 J/kg
Mixed-layer CIN: -8 J/kg
Mixed-layer LCL: 1021 m above ground
0-6 km bulk shear: 13 kt
0-1 km storm-relative helicity: 5 m²/s²
0-3 km storm-relative helicity: 87 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.1

Open this sounding in Storm Lab

The text

As transmitted.

080 
WUUS54 KBMX 100041
SVRBMX
ALC073-100115-
/O.NEW.KBMX.SV.W.0130.210710T0041Z-210710T0115Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Birmingham AL
741 PM CDT Fri Jul 9 2021

The National Weather Service in Birmingham has issued a

* Severe Thunderstorm Warning for...
  South central Jefferson County in central Alabama...

* Until 815 PM CDT.

* At 741 PM CDT, a severe thunderstorm was located over Lipscomb, or
  over Bessemer, moving east at 25 mph.

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

  SOURCE...Radar indicated.

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees.

* Locations impacted include...
  Southwestern Birmingham, Hoover, Vestavia Hills, Bessemer,
  Homewood, Hueytown, Fairfield, Midfield, Brighton, Lipscomb, Splash
  Adventure, Patton Creek, Hoover Metropolitan Stadium, Ross Bridge,
  Bluff Park, Riverchase Galleria, McCalla, Promenade Tannehill,
  Shannon and Bent Brook Golf Club.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3343 8672 3342 8672 3342 8675 3339 8676
      3339 8678 3337 8678 3336 8683 3333 8683
      3333 8688 3330 8691 3330 8692 3335 8707
      3346 8698
TIME...MOT...LOC 0041Z 281DEG 21KT 3339 8691 

HAIL...1.00IN
WIND...60MPH
 
$$

40/Sizemore

1 follow-up statement

712 
WWUS54 KBMX 100102
SVSBMX

Severe Weather Statement
National Weather Service Birmingham AL
802 PM CDT Fri Jul 9 2021

ALC073-100112-
/O.CAN.KBMX.SV.W.0130.000000T0000Z-210710T0115Z/
Jefferson AL-
802 PM CDT Fri Jul 9 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL JEFFERSON COUNTY
IS CANCELLED...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning has been cancelled.  However heavy rain is
still possible with this thunderstorm.

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

LAT...LON 3343 8672 3342 8672 3342 8675 3339 8676
      3339 8678 3337 8678 3336 8683 3333 8683
      3333 8688 3330 8691 3330 8692 3335 8707
      3346 8698
TIME...MOT...LOC 0101Z 281DEG 21KT 3337 8676 

$$

40/Sizemore

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 9, 7:16 PM CDT	Special Weather Statement	BMX	Coosa, Shelby	44 min
Jul 9, 7:55 PM CDT	Special Weather Statement	BMX	Tallapoosa	50 min
Jul 9, 7:58 PM CDT	Flash Flood Warning	BMX	Tuscaloosa	118 min
Jul 9, 8:02 PM CDT	Areal Flood Advisory	BMX	Jefferson, Shelby	114 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.