Alert archive / Alabama / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 9, NWS Birmingham, AL

March 17, 2021Autauga County, Alabama

NWS Birmingham, AL issued this severe thunderstorm warning at Mar 17, 2021, 8:15 PM CDT for Autauga County, Alabama. It was in force for 39 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: Mar 17, 2021, 8:15 PM CDT (01:15 UTC)
Expired: Mar 17, 2021, 8:54 PM CDT
In force: 39 min
Issued by: NWS Birmingham, AL
Area: Storm-based polygon
Hail: 1.25 in
Wind: 60.0 mph

County Autauga County, AL

The radar

The Birmingham radar (KBMX), 74 km from the middle of the area, began a volume at 01:14 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
Mar 17, 8:35 PM CDT	TORNADO	5 Ene Vida Junction, AL	NATIONAL WEATHER SERVICE METEOROLOGISTS SURVEYED DAMAGE SOUTH OF WHITE CITY AND FOUND IT CONSISTENT WITH A TORNADO. THE TORNADO BRIEFLY TOUCHED DOWN ALONG COUNTY ROAD 43 JUST WEST OF COUNTY ROAD 21 WHERE A METAL OUTBUILDING WAS DESTROYED, A COUPLE SOFTWOOD TRE

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
Mar 17, 6:48 PM CDT	Tornado Watch PDS	SPC	8 hr

The nearest sounding before it

Birmingham, AL (KBMX), launched 00:00Z, 1.3 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: 188 J/kg
Mixed-layer CIN: -25 J/kg
Mixed-layer LCL: 669 m above ground
0-6 km bulk shear: 63 kt
0-1 km storm-relative helicity: 336 m²/s²
0-3 km storm-relative helicity: 465 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.6

Open this sounding in Storm Lab

The text

As transmitted.

204 
WUUS54 KBMX 180115
SVRBMX
ALC001-180215-
/O.NEW.KBMX.SV.W.0009.210318T0115Z-210318T0215Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Birmingham AL
815 PM CDT Wed Mar 17 2021

The National Weather Service in Birmingham has issued a

* Severe Thunderstorm Warning for...
  Autauga County in central Alabama...

* Until 915 PM CDT.

* At 814 PM CDT, a severe thunderstorm was located over Mulberry, or
  11 miles east of Valley Grande, moving northeast at 35 mph.

  HAZARD...60 mph wind gusts and half dollar size hail.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Deatsville, Autaugaville, Billingsley, Booth, Mulberry, Marbury,
  Vida Junction, Dawson Mill and New Prospect.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 300 AM CDT for central, south
central and east central Alabama.

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

&&

LAT...LON 3241 8685 3243 8683 3244 8687 3246 8686
      3248 8689 3254 8691 3257 8690 3260 8691
      3266 8687 3266 8671 3271 8671 3271 8641
      3254 8641 3239 8676 3239 8678 3238 8678
      3236 8681
TIME...MOT...LOC 0114Z 238DEG 31KT 3250 8679 

HAIL...1.25IN
WIND...60MPH
 
$$

17/KLAWS

1 follow-up statement

291 
WWUS54 KBMX 180154
SVSBMX

Severe Weather Statement
National Weather Service Birmingham AL
854 PM CDT Wed Mar 17 2021

ALC001-180204-
/O.CAN.KBMX.SV.W.0009.000000T0000Z-210318T0215Z/
Autauga AL-
854 PM CDT Wed Mar 17 2021

...THE SEVERE THUNDERSTORM WARNING FOR AUTAUGA COUNTY IS CANCELLED...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning has been cancelled.

A Tornado Watch remains in effect until 300 AM CDT for central, south
central and east central Alabama.

LAT...LON 3241 8685 3243 8683 3244 8687 3246 8686
      3248 8689 3254 8691 3257 8690 3260 8691
      3266 8687 3266 8671 3271 8671 3271 8641
      3254 8641 3239 8676 3239 8678 3238 8678
      3236 8681
TIME...MOT...LOC 0153Z 238DEG 31KT 3269 8644 

$$

17/KLAWS

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 17, 7:18 PM CDT	Tornado Warning	BMX	Autauga, Dallas	17 min
Mar 17, 7:47 PM CDT	Severe Thunderstorm Warning	BMX	Fayette, Lamar, Marion	58 min
Mar 17, 8:01 PM CDT	Tornado Warning	BMX	Greene, Pickens, Sumter	22 min
Mar 17, 8:32 PM CDT	Tornado Warning	BMX	Autauga, Chilton, Elmore	19 min
Mar 17, 9:06 PM CDT	River Flood Warning	BMX	Greene, Hale, Marengo, Tuscaloosa	33 hr
Mar 17, 9:14 PM CDT	River Flood Warning	BMX	Sumter	37 hr
Mar 17, 9:18 PM CDT	River Flood Warning	BMX	Greene, Hale, Marengo, Sumter	72 hr
Mar 17, 9:48 PM CDT	Areal Flood Advisory	BMX	Blount	3 hr
Mar 17, 9:51 PM CDT	Severe Thunderstorm Warning	BMX	Autauga, Chilton, Coosa, Elmore, Lowndes, Montgomery	69 min
Mar 17, 10:06 PM CDT	Severe Thunderstorm Warning	BMX	St. Clair, Shelby, Talladega	69 min
Mar 17, 10:22 PM CDT	Severe Thunderstorm Warning	BMX	Calhoun, Cherokee, Etowah, St. Clair	68 min
Mar 17, 10:26 PM CDT	Areal Flood Advisory	BMX	Calhoun, Cherokee, Cleburne, Etowah, St. Clair, Talladega	3 hr
Mar 17, 10:30 PM CDT	Severe Thunderstorm Warning	BMX	Bullock, Lee, Macon, Tallapoosa	75 min
Mar 17, 10:43 PM CDT	Tornado Warning	BMX	Coosa	6 min
Mar 17, 11:34 PM CDT	Special Weather Statement	BMX	Lee, Russell	41 min
Mar 18, 2:46 AM CDT	Special Weather Statement	BMX	Russell	44 min
Mar 18, 3:06 AM CDT	Wind Advisory	BMX	Autauga, Barbour, Bibb, Blount, Bullock, Calhoun and 33 more	16 hr
Mar 18, 8:31 AM CDT	Areal Flood Warning	BMX	Cherokee	55 hr
Mar 18, 9:50 AM CDT	River Flood Warning	BMX	Jefferson, Tuscaloosa, Walker	36 hr

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.