Alert archive / Alabama / Tornado Warnings in 2021

Tornado Warning 43, NWS Birmingham, AL

March 17, 2021Coosa County, Alabama

NWS Birmingham, AL issued this tornado warning at Mar 17, 2021, 10:43 PM CDT for Coosa County, Alabama. It was in force for 6 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: Mar 17, 2021, 10:43 PM CDT (03:43 UTC)
Expired: Mar 17, 2021, 10:49 PM CDT
In force: 6 min
Issued by: NWS Birmingham, AL
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

County Coosa County, AL

The radar

The Maxwell AFB radar (KMXX), 57 km from the middle of the area, began a volume at 03:46 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 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, 3.7 hours before the alert went out and 68 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.

341 
WFUS54 KBMX 180343
TORBMX
ALC037-180415-
/O.NEW.KBMX.TO.W.0043.210318T0343Z-210318T0415Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Birmingham AL
1043 PM CDT Wed Mar 17 2021

The National Weather Service in Birmingham has issued a

* Tornado Warning for...
  Northeastern Coosa County in east central Alabama...

* Until 1115 PM CDT.
    
* At 1042 PM CDT, a severe thunderstorm capable of producing a
  tornado was located over Crewsville, or near Kellyton, moving
  northeast at 55 mph.

  HAZARD...Tornado.

  SOURCE...Radar indicated rotation.

  IMPACT...Flying debris will be dangerous to those caught without 
           shelter. Mobile homes will be damaged or destroyed. 
           Damage to roofs, windows, and vehicles will occur.  Tree 
           damage is likely.

* Locations impacted include...
  Goodwater, Kellyton, Hatchet, Crewsville and Bradford. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

&&

LAT...LON 3288 8614 3296 8620 3311 8602 3311 8601
      3294 8601
TIME...MOT...LOC 0342Z 231DEG 46KT 3295 8611 

TORNADO...RADAR INDICATED
HAIL...<.75IN

$$

17/KLAWS

1 follow-up statement

323 
WWUS54 KBMX 180349
SVSBMX

Severe Weather Statement
National Weather Service Birmingham AL
1049 PM CDT Wed Mar 17 2021

ALC037-180359-
/O.CAN.KBMX.TO.W.0043.000000T0000Z-210318T0415Z/
Coosa AL-
1049 PM CDT Wed Mar 17 2021

...THE TORNADO WARNING FOR NORTHEASTERN COOSA COUNTY IS CANCELLED...
    
The tornado threat has diminished and the Tornado Warning has been
cancelled. However, large hail and damaging winds remain likely and a
Severe Thunderstorm Warning remains in effect for the area.

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

LAT...LON 3288 8614 3296 8620 3311 8602 3311 8601
      3294 8601
TIME...MOT...LOC 0347Z 231DEG 46KT 3301 8603 

$$

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, 8:15 PM CDT	Severe Thunderstorm Warning	BMX	Autauga	39 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, 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

Tornado Warnings in Alabama, 2021 Every tornado warning in 2021 Tornadoes 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.