Alert archive / Alabama / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 135, NWS Birmingham, AL
NWS Birmingham, AL issued this severe thunderstorm warning at Jul 31, 2021, 3:34 PM CDT for Jefferson County, Shelby County, Alabama. It was in force for 41 min. 4 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
- Jul 31, 2021, 3:34 PM CDT (20:34 UTC)
- Expired
- Jul 31, 2021, 4:15 PM CDT
- In force
- 41 min
- Issued by
- NWS Birmingham, AL
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Jefferson County, AL, Shelby County, AL
The radar
The Birmingham radar (KBMX), 21 km from the middle of the area, began a volume at 20:35 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jul 31, 3:37 PM CDT | TSTM WND DMG | 1 S Mountain Brook, AL | TREE DOWN ON PINE RIDGE ROAD. |
| Jul 31, 3:40 PM CDT | TSTM WND DMG | Concord, AL | A VERY LARGE PECAN TREE WAS BLOWN DOWN IN CONCORD. |
| Jul 31, 3:45 PM CDT | TSTM WND DMG | 1 Sse Samford Universit, AL | TREES WERE BLOWN DOWN ON SHADES CREEK ROAD, IN VESTAVIA HILLS. |
| Jul 31, 3:53 PM CDT | TSTM WND DMG | 4 Ese Oak Mountain Stat, AL | TWO TREES WERE BLOWN DOWN, NEAR CHELSEA. |
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, 8.6 hours before the alert went out and 20 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.
- Mixed-layer CAPE
- 1260 J/kg
- Mixed-layer CIN
- -102 J/kg
- Mixed-layer LCL
- 1122 m above ground
- 0-6 km bulk shear
- 9 kt
- 0-1 km storm-relative helicity
- -46 m²/s²
- 0-3 km storm-relative helicity
- -36 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
051
WUUS54 KBMX 312034
SVRBMX
ALC073-117-312115-
/O.NEW.KBMX.SV.W.0135.210731T2034Z-210731T2115Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Birmingham AL
334 PM CDT Sat Jul 31 2021
The National Weather Service in Birmingham has issued a
* Severe Thunderstorm Warning for...
Central Shelby County in central Alabama...
Southern Jefferson County in central Alabama...
* Until 415 PM CDT.
* At 334 PM CDT, severe thunderstorms were located along a line
extending from Shops of Grand River to Birmingham to near North
Johns, moving south at 30 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
* Locations impacted include...
Birmingham, Hoover, Vestavia Hills, Alabaster, Bessemer, Homewood,
Pelham, Mountain Brook, Trussville, Helena, Hueytown, Irondale,
Leeds, Fairfield, Chelsea, Pleasant Grove, Tarrant, Midfield,
Brighton and Indian Springs Village.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3356 8655 3353 8650 3334 8646 3323 8677
3316 8700 3317 8702 3318 8703 3319 8702
3325 8703 3325 8706 3328 8707 3329 8709
3329 8712 3346 8716 3364 8658
TIME...MOT...LOC 2034Z 355DEG 26KT 3356 8660 3347 8687 3338 8716
HAIL...<.75IN
WIND...60MPH
$$
87/GRANTHAM3 follow-up statements
828
WWUS54 KBMX 312048
SVSBMX
Severe Weather Statement
National Weather Service Birmingham AL
348 PM CDT Sat Jul 31 2021
ALC073-117-312115-
/O.CON.KBMX.SV.W.0135.000000T0000Z-210731T2115Z/
Shelby AL-Jefferson AL-
348 PM CDT Sat Jul 31 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 415 PM CDT
FOR CENTRAL SHELBY AND SOUTHEASTERN JEFFERSON COUNTIES...
At 348 PM CDT, severe thunderstorms were located along a line
extending from near Vandiver to Hoover to near North Johns, moving
southeast at 25 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
Locations impacted include...
Birmingham, Hoover, Vestavia Hills, Alabaster, Bessemer, Homewood,
Pelham, Mountain Brook, Trussville, Helena, Hueytown, Irondale,
Leeds, Fairfield, Chelsea, Pleasant Grove, Midfield, Brighton, Indian
Springs Village and Lipscomb.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3345 8716 3356 8680 3362 8657 3356 8655
3353 8650 3334 8646 3323 8677 3316 8700
3317 8702 3318 8703 3319 8702 3325 8703
3325 8706 3328 8707 3329 8709 3329 8712
TIME...MOT...LOC 2048Z 335DEG 24KT 3350 8654 3341 8681 3332 8710
HAIL...<.75IN
WIND...60MPH
$$
87/GRANTHAM323
WWUS54 KBMX 312101
SVSBMX
Severe Weather Statement
National Weather Service Birmingham AL
401 PM CDT Sat Jul 31 2021
ALC073-117-312115-
/O.CON.KBMX.SV.W.0135.000000T0000Z-210731T2115Z/
Shelby AL-Jefferson AL-
401 PM CDT Sat Jul 31 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 415 PM CDT
FOR CENTRAL SHELBY AND SOUTH CENTRAL JEFFERSON COUNTIES...
At 401 PM CDT, severe thunderstorms were located along a line
extending from near Westover to Pelham to near Splash Adventure,
moving south at 35 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
Locations impacted include...
Hoover, Alabaster, Bessemer, Pelham, Helena, Chelsea, Indian Springs
Village, Harpersville, Westover, Oak Mountain State Park, Maylene,
Oak Mountain Amphitheater, Highland Lakes, Riverchase, Hoover
Metropolitan Stadium, Joe Tucker Park, Promenade Tannehill, Bent
Brook Golf Club, Siluria and McCalla.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3330 8709 3335 8708 3336 8678 3344 8648
3334 8646 3323 8677 3316 8700 3317 8702
3318 8703 3319 8702 3325 8703 3325 8706
3328 8707
TIME...MOT...LOC 2101Z 348DEG 32KT 3338 8649 3330 8677 3333 8702
HAIL...<.75IN
WIND...60MPH
$$
87/GRANTHAM835
WWUS54 KBMX 312105
SVSBMX
Severe Weather Statement
National Weather Service Birmingham AL
405 PM CDT Sat Jul 31 2021
ALC073-117-312115-
/O.EXP.KBMX.SV.W.0135.000000T0000Z-210731T2115Z/
Shelby AL-Jefferson AL-
405 PM CDT Sat Jul 31 2021
...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL SHELBY AND SOUTH
CENTRAL JEFFERSON COUNTIES WILL EXPIRE AT 415 PM CDT...
The storms which prompted the warning have moved out of the area.
Therefore, the warning will be allowed to expire. However gusty
winds are still possible with these thunderstorms.
LAT...LON 3330 8709 3335 8708 3336 8678 3344 8648
3334 8646 3323 8677 3316 8700 3317 8702
3318 8703 3319 8702 3325 8703 3325 8706
3328 8707
TIME...MOT...LOC 2105Z 355DEG 26KT 3336 8649 3328 8677 3331 8702
$$
87/GRANTHAMThe office that day
Everything else NWS Birmingham, AL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 30, 7:07 PM CDT | Special Weather Statement | BMX | Winston | 38 min |
| Jul 30, 7:45 PM CDT | Severe Thunderstorm Warning | BMX | Cherokee, Etowah | 31 min |
| Jul 30, 7:51 PM CDT | Severe Thunderstorm Warning | BMX | Blount | 39 min |
| Jul 31, 2:25 PM CDT | Special Weather Statement | BMX | Russell | 50 min |
| Jul 31, 2:26 PM CDT | Special Weather Statement | BMX | St. Clair | 49 min |
| Jul 31, 2:28 PM CDT | Special Weather Statement | BMX | Chilton | 47 min |
| Jul 31, 2:29 PM CDT | Special Weather Statement | BMX | Dallas | 46 min |
| Jul 31, 2:44 PM CDT | Special Weather Statement | BMX | Shelby | 46 min |
| Jul 31, 2:47 PM CDT | Special Weather Statement | BMX | Jefferson, Walker | 43 min |
| Jul 31, 2:56 PM CDT | Severe Thunderstorm Warning | BMX | Blount, Jefferson, Walker | 49 min |
| Jul 31, 3:04 PM CDT | Severe Thunderstorm Warning | BMX | Calhoun, St. Clair, Talladega | 41 min |
| Jul 31, 3:09 PM CDT | Special Weather Statement | BMX | Chilton | 51 min |
| Jul 31, 3:11 PM CDT | Special Weather Statement | BMX | Russell | 34 min |
| Jul 31, 3:23 PM CDT | Special Weather Statement | BMX | Coosa | 37 min |
| Jul 31, 3:38 PM CDT | Severe Thunderstorm Warning | BMX | Chilton, Coosa, Shelby, Talladega | 52 min |
| Jul 31, 3:41 PM CDT | Special Weather Statement | BMX | Talladega | 34 min |
| Jul 31, 3:57 PM CDT | Special Weather Statement | BMX | Shelby | 33 min |
| Jul 31, 3:59 PM CDT | Special Weather Statement | BMX | Elmore, Montgomery | 46 min |
| Jul 31, 4:12 PM CDT | Special Weather Statement | BMX | Clay, Randolph | 48 min |
| Jul 31, 4:18 PM CDT | Special Weather Statement | BMX | Chambers | 42 min |
| Jul 31, 4:22 PM CDT | Special Weather Statement | BMX | Tallapoosa | 53 min |
| Jul 31, 4:45 PM CDT | Severe Thunderstorm Warning | BMX | Tallapoosa | 45 min |
| Jul 31, 4:49 PM CDT | Special Weather Statement | BMX | Bibb | 41 min |
| Jul 31, 5:00 PM CDT | Special Weather Statement | BMX | Lee | 60 min |
| Jul 31, 6:36 PM CDT | Special Weather Statement | BMX | Barbour, Russell | 39 min |
Nearby
Severe Thunderstorm Warnings in Alabama, 2021Every 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.