Alert archive / Alabama / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 47, NWS Birmingham, AL

April 9, 2021Blount County, Jefferson County, Walker County, Alabama

NWS Birmingham, AL issued this severe thunderstorm warning at Apr 9, 2021, 1:22 PM CDT for Blount County, Jefferson County, Walker County, Alabama. It was in force for 36 min. 6 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: Apr 9, 2021, 1:22 PM CDT (18:22 UTC)
Expired: Apr 9, 2021, 1:58 PM CDT
In force: 36 min
Issued by: NWS Birmingham, AL
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Blount County, AL, Jefferson County, AL, Walker County, AL

The radar

The Birmingham radar (KBMX), 76 km from the middle of the area, began a volume at 18:23 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
Apr 9, 1:22 PM CDT	HAIL 1	Dora, AL	QUARTER SIZE HAIL REPORTED ON SHARON BLVD IN DORA. VIA SOCIAL MEDIA.
Apr 9, 1:25 PM CDT	HAIL 1.75	1 Wnw Sumiton, AL	REPORT RELAYED FROM AMATEUR RADIO OPERATOR.
Apr 9, 1:28 PM CDT	HAIL 1	Sumiton, AL	SEVERAL REPORTS OF QUARTER SIZE HAIL IN SUMITON. SOME OF THE HAIL TOTALLY COVERED DECKS. VIA SOCIAL MEDIA.
Apr 9, 1:28 PM CDT	HAIL 1	Sumiton, AL	SEVERAL REPORTS OF QUARTER SIZE HAIL IN SUMITON. VIA SOCIAL MEDIA.
Apr 9, 1:40 PM CDT	HAIL 1	1 Nw Kimberly, AL	QUARTER SIZE HAIL RECEIVED THROUGH SOCIAL MEDIA.
Apr 9, 1:42 PM CDT	HAIL 0.7	1 Wsw Kimberly, AL	DIME SIZE HAIL FELL NEAR MORRIS.

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

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Apr 9, 12:54 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Birmingham, AL (KBMX), launched 12:00Z, 6.4 hours before the alert went out and 75 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: 89 J/kg
Mixed-layer CIN: -208 J/kg
Mixed-layer LCL: 1321 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 70 m²/s²
0-3 km storm-relative helicity: 141 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.0

Open this sounding in Storm Lab

The text

As transmitted.

940 
WUUS54 KBMX 091822
SVRBMX
ALC009-073-127-091915-
/O.NEW.KBMX.SV.W.0047.210409T1822Z-210409T1915Z/

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

The National Weather Service in Birmingham has issued a

* Severe Thunderstorm Warning for...
  East central Walker County in central Alabama...
  Southwestern Blount County in central Alabama...
  North central Jefferson County in central Alabama...

* Until 215 PM CDT.

* At 122 PM CDT, a severe thunderstorm was located over Sumiton,
  moving northeast at 10 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...
  Sumiton, Dora, Warrior, Kimberly, Morris, Trafford, Sipsey, County
  Line, Rocky Hollow, Burnwell, Arkadelphia, Beloit, Sayre, Empire,
  Rickwood Caverns, Partridge Crossroads and Smoke Rise.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3387 8681 3379 8669 3367 8705 3373 8715
      3389 8701 3387 8701 3386 8699 3386 8696
      3387 8696 3387 8692 3389 8692
TIME...MOT...LOC 1822Z 238DEG 10KT 3373 8706 

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

40/Sizemore

2 follow-up statements

235 
WWUS54 KBMX 091837
SVSBMX

Severe Weather Statement
National Weather Service Birmingham AL
137 PM CDT Fri Apr 9 2021

ALC009-073-127-091915-
/O.CON.KBMX.SV.W.0047.000000T0000Z-210409T1915Z/
Walker AL-Blount AL-Jefferson AL-
137 PM CDT Fri Apr 9 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 215 PM CDT
FOR EAST CENTRAL WALKER...SOUTHWESTERN BLOUNT AND NORTH CENTRAL
JEFFERSON COUNTIES...

At 137 PM CDT, a severe thunderstorm was located over Sumiton, moving
northeast at 10 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...
Sumiton, Dora, Warrior, Kimberly, Morris, Trafford, County Line,
Arkadelphia, Sayre, Empire, Rickwood Caverns, Partridge Crossroads
and Smoke Rise.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3387 8681 3379 8669 3370 8697 3376 8708
      3386 8698 3386 8696 3387 8696 3387 8692
      3389 8692
TIME...MOT...LOC 1837Z 238DEG 10KT 3375 8702 

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

40/Sizemore

125 
WWUS54 KBMX 091858
SVSBMX

Severe Weather Statement
National Weather Service Birmingham AL
158 PM CDT Fri Apr 9 2021

ALC009-073-127-091906-
/O.CAN.KBMX.SV.W.0047.000000T0000Z-210409T1915Z/
Walker AL-Blount AL-Jefferson AL-
158 PM CDT Fri Apr 9 2021

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL WALKER...
SOUTHWESTERN BLOUNT AND NORTH CENTRAL JEFFERSON COUNTIES IS
CANCELLED...
        
The storm which prompted the warning has moved out of the area.
Therefore, this warning has been cancelled. However, portions of 
Blount and Jefferson County remain in another Severe Thunderstorm 
Warning.

A Severe Thunderstorm Watch remains in effect until 700 PM CDT for
central Alabama.

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


LAT...LON 3387 8681 3379 8669 3370 8697 3376 8708
      3386 8698 3386 8696 3387 8696 3387 8692
      3389 8692
TIME...MOT...LOC 1854Z 238DEG 10KT 3378 8696 

$$

40/Sizemore

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 8, 8:45 PM CDT	River Flood Warning	BMX	Greene, Pickens, Sumter	4 days
Apr 9, 6:09 AM CDT	Special Weather Statement	BMX	Bullock	51 min
Apr 9, 7:03 AM CDT	Severe Thunderstorm Warning	BMX	Marengo	28 min
Apr 9, 8:02 AM CDT	Special Weather Statement	BMX	Marengo	43 min
Apr 9, 8:06 AM CDT	Severe Thunderstorm Warning	BMX	Marengo	24 min
Apr 9, 8:22 AM CDT	Special Weather Statement	BMX	Barbour	38 min
Apr 9, 8:43 AM CDT	Special Weather Statement	BMX	Macon	32 min
Apr 9, 9:07 AM CDT	River Flood Warning	BMX	Greene, Marengo, Sumter	69 hr
Apr 9, 9:07 AM CDT	River Flood Warning	BMX	Greene, Hale, Marengo, Sumter	5 days
Apr 9, 9:14 AM CDT	River Flood Warning	BMX	Greene, Hale, Marengo	3 days
Apr 9, 9:40 AM CDT	Special Weather Statement	BMX	Elmore	50 min
Apr 9, 9:56 AM CDT	Severe Thunderstorm Warning	BMX	Autauga, Chilton, Coosa, Elmore	25 min
Apr 9, 10:21 AM CDT	Special Weather Statement	BMX	Elmore	39 min
Apr 9, 10:32 AM CDT	Severe Thunderstorm Warning	BMX	Elmore	18 min
Apr 9, 11:07 AM CDT	Special Weather Statement	BMX	Macon	38 min
Apr 9, 11:12 AM CDT	Severe Thunderstorm Warning	BMX	Lee, Macon	26 min
Apr 9, 12:00 PM CDT	Special Weather Statement	BMX	Talladega	45 min
Apr 9, 12:11 PM CDT	Special Weather Statement	BMX	Shelby	49 min
Apr 9, 12:46 PM CDT	Special Weather Statement	BMX	Walker, Winston	44 min
Apr 9, 12:49 PM CDT	Special Weather Statement	BMX	Dallas	41 min
Apr 9, 12:51 PM CDT	Severe Thunderstorm Warning	BMX	Walker, Winston	54 min
Apr 9, 1:14 PM CDT	Special Weather Statement	BMX	Talladega	46 min
Apr 9, 1:36 PM CDT	Severe Thunderstorm Warning	BMX	Walker, Winston	39 min
Apr 9, 1:40 PM CDT	Special Weather Statement	BMX	Autauga	35 min
Apr 9, 1:40 PM CDT	Special Weather Statement	BMX	Dallas	35 min
Apr 9, 1:52 PM CDT	Severe Thunderstorm Warning	BMX	Blount, Jefferson, St. Clair	38 min
Apr 9, 1:55 PM CDT	Severe Thunderstorm Warning	BMX	Dallas, Lowndes	65 min
Apr 9, 2:05 PM CDT	Severe Thunderstorm Warning	BMX	Walker	55 min
Apr 9, 2:21 PM CDT	Severe Thunderstorm Warning	BMX	Lowndes	54 min
Apr 9, 2:31 PM CDT	Special Weather Statement	BMX	St. Clair	44 min
Apr 9, 2:39 PM CDT	Severe Thunderstorm Warning	BMX	Blount, Jefferson, Walker	51 min
Apr 9, 3:21 PM CDT	Special Weather Statement	BMX	Pike	39 min
Apr 9, 4:04 PM CDT	Special Weather Statement	BMX	Hale	41 min
Apr 9, 4:13 PM CDT	Severe Thunderstorm Warning	BMX	Greene, Hale, Marengo, Sumter	47 min
Apr 9, 4:34 PM CDT	Special Weather Statement	BMX	Shelby	41 min
Apr 9, 4:44 PM CDT	Special Weather Statement	BMX	Greene	31 min
Apr 9, 4:54 PM CDT	Severe Thunderstorm Warning	BMX	Greene	25 min
Apr 9, 4:56 PM CDT	Special Weather Statement	BMX	Hale	34 min
Apr 9, 5:28 PM CDT	Special Weather Statement	BMX	Pickens	32 min
Apr 9, 5:37 PM CDT	Special Weather Statement	BMX	Hale	23 min
Apr 9, 5:41 PM CDT	Special Weather Statement	BMX	Tuscaloosa	34 min
Apr 9, 5:47 PM CDT	Severe Thunderstorm Warning	BMX	Pickens, Tuscaloosa	28 min
Apr 9, 5:52 PM CDT	Special Weather Statement	BMX	Greene	23 min
Apr 9, 5:58 PM CDT	Special Weather Statement	BMX	Pickens	32 min
Apr 9, 6:11 PM CDT	Severe Thunderstorm Warning	BMX	Fayette, Pickens, Tuscaloosa	37 min
Apr 9, 6:15 PM CDT	Severe Thunderstorm Warning	BMX	Pickens	23 min
Apr 9, 6:37 PM CDT	Special Weather Statement	BMX	Pickens	23 min
Apr 9, 6:53 PM CDT	Special Weather Statement	BMX	Pickens	37 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.