Alert archive / Alabama / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 132, NWS Birmingham, AL

July 30, 2021Blount County, Alabama

NWS Birmingham, AL issued this severe thunderstorm warning at Jul 30, 2021, 7:51 PM CDT for Blount County, Alabama. It was in force for 39 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
Jul 30, 2021, 7:51 PM CDT (00:51 UTC)
Expired
Jul 30, 2021, 8:30 PM CDT
In force
39 min
Issued by
NWS Birmingham, AL
Area
Storm-based polygon
Hail
0.75 in
Wind
60.0 mph

County Blount County, AL

The radar

The Birmingham radar (KBMX), 90 km from the middle of the area, began a volume at 00:53 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 00:00Z, 0.9 hours before the alert went out and 89 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-pSkew-T log-p diagram, Birmingham, AL at 00:00Z on 2021-07-31Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2302 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Birmingham, AL at 00:00Z on 2021-07-31The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 29 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
2302 J/kg
Mixed-layer CIN
-18 J/kg
Mixed-layer LCL
1114 m above ground
0-6 km bulk shear
8 kt
0-1 km storm-relative helicity
29 m²/s²
0-3 km storm-relative helicity
46 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

151 
WUUS54 KBMX 310051
SVRBMX
ALC009-310130-
/O.NEW.KBMX.SV.W.0132.210731T0051Z-210731T0130Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Birmingham AL
751 PM CDT Fri Jul 30 2021

The National Weather Service in Birmingham has issued a

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

* Until 830 PM CDT.

* At 750 PM CDT, a severe thunderstorm was located near Hanceville,
  or near Blountsville, moving southeast at 30 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Oneonta, Blountsville, Cleveland, Dallas, Locust Fork, Susan Moore,
  Allgood, Fairview, Nectar, Rosa, Inland Lake, Bangor, Highland
  Lake, Easley, Chamblees Mill, Holly Springs, Remlap, Fowler Spring,
  Clear Springs and Hendrix.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Large hail and damaging winds and continuous cloud to ground
lightning is occurring with this storm. Move indoors immediately.
Lightning is one of nature's leading killers. Remember, if you can
hear thunder, you are close enough to be struck by lightning.

&&

LAT...LON 3395 8636 3394 8637 3394 8635 3392 8634
      3391 8635 3389 8634 3385 8639 3380 8652
      3380 8657 3377 8658 3377 8659 3395 8679
      3403 8672 3403 8670 3412 8662 3412 8660
      3415 8659 3417 8655
TIME...MOT...LOC 0050Z 323DEG 25KT 3406 8669 

HAIL...<.75IN
WIND...60MPH
 
$$

CBD
2 follow-up statements
181 
WWUS54 KBMX 310118
SVSBMX

Severe Weather Statement
National Weather Service Birmingham AL
818 PM CDT Fri Jul 30 2021

ALC009-310130-
/O.CON.KBMX.SV.W.0132.000000T0000Z-210731T0130Z/
Blount AL-
818 PM CDT Fri Jul 30 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 830 PM CDT
FOR SOUTHEASTERN BLOUNT COUNTY...

At 818 PM CDT, a severe thunderstorm was located over Locust Fork, or
near Cleveland, moving southeast at 25 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

Locations impacted include...
Oneonta, Blountsville, Cleveland, Dallas, Locust Fork, Allgood,
Fairview, Nectar, Rosa, Inland Lake, Highland Lake, Easley, Remlap,
Fowler Spring, Clear Springs and Hendrix.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Continuous cloud to ground lightning is occurring with this storm.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.

&&

LAT...LON 3395 8636 3387 8644 3379 8661 3393 8677
      3401 8667 3410 8650
TIME...MOT...LOC 0118Z 330DEG 22KT 3393 8661 

HAIL...<.75IN
WIND...60MPH
 
$$
978 
WWUS54 KBMX 310128
SVSBMX

Severe Weather Statement
National Weather Service Birmingham AL
828 PM CDT Fri Jul 30 2021

ALC009-310138-
/O.EXP.KBMX.SV.W.0132.000000T0000Z-210731T0130Z/
Blount AL-
828 PM CDT Fri Jul 30 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN BLOUNT COUNTY
WILL EXPIRE AT 830 PM CDT...
                
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 will be allowed to expire.  However gusty
winds are still possible with this thunderstorm.

LAT...LON 3395 8636 3387 8644 3379 8661 3393 8677
      3401 8667 3410 8650
TIME...MOT...LOC 0128Z 323DEG 25KT 3388 8657 

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 30, 7:07 PM CDTSpecial Weather StatementBMXWinston38 min
Jul 30, 7:45 PM CDTSevere Thunderstorm WarningBMXCherokee, Etowah31 min
Jul 31, 2:25 PM CDTSpecial Weather StatementBMXRussell50 min
Jul 31, 2:26 PM CDTSpecial Weather StatementBMXSt. Clair49 min
Jul 31, 2:28 PM CDTSpecial Weather StatementBMXChilton47 min
Jul 31, 2:29 PM CDTSpecial Weather StatementBMXDallas46 min
Jul 31, 2:44 PM CDTSpecial Weather StatementBMXShelby46 min
Jul 31, 2:47 PM CDTSpecial Weather StatementBMXJefferson, Walker43 min
Jul 31, 2:56 PM CDTSevere Thunderstorm WarningBMXBlount, Jefferson, Walker49 min
Jul 31, 3:04 PM CDTSevere Thunderstorm WarningBMXCalhoun, St. Clair, Talladega41 min
Jul 31, 3:09 PM CDTSpecial Weather StatementBMXChilton51 min
Jul 31, 3:11 PM CDTSpecial Weather StatementBMXRussell34 min
Jul 31, 3:23 PM CDTSpecial Weather StatementBMXCoosa37 min
Jul 31, 3:34 PM CDTSevere Thunderstorm WarningBMXJefferson, Shelby41 min
Jul 31, 3:38 PM CDTSevere Thunderstorm WarningBMXChilton, Coosa, Shelby, Talladega52 min
Jul 31, 3:41 PM CDTSpecial Weather StatementBMXTalladega34 min
Jul 31, 3:57 PM CDTSpecial Weather StatementBMXShelby33 min
Jul 31, 3:59 PM CDTSpecial Weather StatementBMXElmore, Montgomery46 min
Jul 31, 4:12 PM CDTSpecial Weather StatementBMXClay, Randolph48 min
Jul 31, 4:18 PM CDTSpecial Weather StatementBMXChambers42 min
Jul 31, 4:22 PM CDTSpecial Weather StatementBMXTallapoosa53 min
Jul 31, 4:45 PM CDTSevere Thunderstorm WarningBMXTallapoosa45 min
Jul 31, 4:49 PM CDTSpecial Weather StatementBMXBibb41 min
Jul 31, 5:00 PM CDTSpecial Weather StatementBMXLee60 min
Jul 31, 6:36 PM CDTSpecial Weather StatementBMXBarbour, Russell39 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.