Alert archive / Alabama / Tornado Warnings in 2021

Tornado Warning 35, NWS Birmingham, AL

March 17, 2021Marengo County, Alabama

NWS Birmingham, AL issued this tornado warning at Mar 17, 2021, 5:41 PM CDT for Marengo County, Alabama. It was in force for 23 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, 5:41 PM CDT (22:41 UTC)
Expired
Mar 17, 2021, 6:04 PM CDT
In force
23 min
Issued by
NWS Birmingham, AL
Area
Storm-based polygon
Tornado
Radar indicated
Hail
1.0 in

County Marengo County, AL

The radar

The Birmingham radar (KBMX), 139 km from the middle of the area, began a volume at 22:42 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.

IssuedProductOfficeLasted
Mar 17, 11:36 AM CDTTornado Watch PDSSPC7 hr

The nearest sounding before it

Birmingham, AL (KBMX), launched 12:00Z, 10.7 hours before the alert went out and 139 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 12:00Z on 2021-03-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 658 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Birmingham, AL at 12:00Z on 2021-03-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 169 square meters per square second.19395878Sfc1 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
658 J/kg
Mixed-layer CIN
-112 J/kg
Mixed-layer LCL
759 m above ground
0-6 km bulk shear
59 kt
0-1 km storm-relative helicity
169 m²/s²
0-3 km storm-relative helicity
301 m²/s²
Significant tornado parameter
0.0
Supercell composite
2.1

Open this sounding in Storm Lab

The text

As transmitted.

349 
WFUS54 KBMX 172241
TORBMX
ALC091-172330-
/O.NEW.KBMX.TO.W.0035.210317T2241Z-210317T2330Z/

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

The National Weather Service in Birmingham has issued a

* Tornado Warning for...
  Southeastern Marengo County in southwestern Alabama...

* Until 630 PM CDT.
    
* At 540 PM CDT, a severe thunderstorm capable of producing a tornado
  was located over Shawnee, or near Thomasville, moving northeast at
  40 mph.

  HAZARD...Tornado and quarter size hail.

  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...
  Thomaston, Surginer, Shawnee, Dixons Mill, Consul, Magnolia,
  Vineland and Clayhill.

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 3199 8787 3235 8753 3231 8752 3231 8747
      3227 8747 3227 8751 3225 8752 3213 8752
      3213 8762 3201 8762 3200 8763 3200 8767
      3199 8767
TIME...MOT...LOC 2240Z 230DEG 36KT 3197 8774 

TORNADO...RADAR INDICATED
HAIL...1.00IN

$$

17/KLAWS
1 follow-up statement
062 
WWUS54 KBMX 172304
SVSBMX

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

ALC091-172314-
/O.CAN.KBMX.TO.W.0035.000000T0000Z-210317T2330Z/
Marengo AL-
604 PM CDT Wed Mar 17 2021

...THE TORNADO WARNING FOR SOUTHEASTERN MARENGO 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 700 PM CDT for south central,
central and southwestern Alabama.

LAT...LON 3199 8787 3235 8753 3231 8752 3231 8747
      3227 8747 3227 8751 3225 8752 3213 8752
      3213 8762 3201 8762 3200 8763 3200 8767
      3199 8767
TIME...MOT...LOC 2301Z 230DEG 36KT 3212 8752 

$$

17/KLAWS

The office that day

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

IssuedProductOfficeCountiesLasted
Mar 16, 9:59 PM CDTSpecial Weather StatementBMXSumter46 min
Mar 16, 10:11 PM CDTSevere Thunderstorm WarningBMXSumter24 min
Mar 16, 10:38 PM CDTSpecial Weather StatementBMXHale37 min
Mar 17, 1:27 AM CDTDense Fog AdvisoryBMXAutauga, Barbour, Blount, Bullock, Calhoun, Chambers and 22 more6 hr
Mar 17, 11:18 AM CDTSpecial Weather StatementBMXJefferson27 min
Mar 17, 12:13 PM CDTTornado WarningBMXDallas47 min
Mar 17, 12:19 PM CDTAreal Flood AdvisoryBMXJefferson, Tuscaloosa2 hr
Mar 17, 12:21 PM CDTSevere Thunderstorm WarningBMXFayette, Lamar, Marion25 min
Mar 17, 12:41 PM CDTTornado WarningBMXAutauga64 min
Mar 17, 12:59 PM CDTTornado WarningBMXGreene, Sumter61 min
Mar 17, 1:18 PM CDTTornado WarningBMXAutauga, Chilton, Elmore57 min
Mar 17, 1:40 PM CDTSevere Thunderstorm WarningBMXPickens, Tuscaloosa28 min
Mar 17, 1:52 PM CDTTornado WarningBMXGreene, Hale, Marengo, Sumter41 min
Mar 17, 1:58 PM CDTTornado WarningBMXMarengo62 min
Mar 17, 1:59 PM CDTTornado WarningBMXGreene, Hale46 min
Mar 17, 2:02 PM CDTTornado Warning Tornado observedBMXChilton, Coosa58 min
Mar 17, 2:09 PM CDTTornado WarningBMXMarengo66 min
Mar 17, 2:14 PM CDTTornado WarningBMXJefferson, Walker61 min
Mar 17, 2:20 PM CDTTornado Warning Tornado observedBMXTuscaloosa40 min
Mar 17, 2:33 PM CDTTornado Warning Tornado observedBMXClay, Coosa, Talladega42 min
Mar 17, 2:44 PM CDTFlash Flood WarningBMXHale, Marengo, Perry2 hr
Mar 17, 2:47 PM CDTAreal Flood AdvisoryBMXGreene, Pickens, Sumter, Tuscaloosa2 hr
Mar 17, 2:48 PM CDTAreal Flood AdvisoryBMXBlount, Jefferson, Walker2 hr
Mar 17, 2:48 PM CDTAreal Flood AdvisoryBMXFayette, Lamar, Marion, Walker, Winston2 hr
Mar 17, 2:51 PM CDTFlash Flood WarningBMXJefferson2 hr
Mar 17, 2:53 PM CDTTornado Warning Tornado observedBMXTuscaloosa52 min
Mar 17, 2:54 PM CDTTornado WarningBMXDallas, Marengo, Perry66 min
Mar 17, 2:58 PM CDTTornado WarningBMXBlount, Jefferson34 min
Mar 17, 3:21 PM CDTTornado WarningBMXTuscaloosa54 min
Mar 17, 3:25 PM CDTFlash Flood WarningBMXTuscaloosa2 hr
Mar 17, 3:28 PM CDTAreal Flood AdvisoryBMXDallas, Perry2 hr
Mar 17, 3:34 PM CDTTornado Warning Tornado observedBMXJefferson, Walker56 min
Mar 17, 3:37 PM CDTTornado WarningBMXMarengo38 min
Mar 17, 3:58 PM CDTTornado Warning Tornado observedBMXJefferson47 min
Mar 17, 3:58 PM CDTTornado WarningBMXDallas, Perry47 min
Mar 17, 4:12 PM CDTTornado WarningBMXDallas48 min
Mar 17, 4:28 PM CDTTornado Warning Tornado observedBMXMarengo62 min
Mar 17, 4:36 PM CDTTornado Warning Tornado observedBMXJefferson54 min
Mar 17, 4:40 PM CDTTornado WarningBMXAutauga50 min
Mar 17, 4:43 PM CDTTornado WarningBMXDallas, Perry47 min
Mar 17, 5:00 PM CDTTornado WarningBMXChilton60 min
Mar 17, 5:09 PM CDTAreal Flood AdvisoryBMXJefferson111 min
Mar 17, 5:15 PM CDTTornado WarningBMXChilton60 min
Mar 17, 5:16 PM CDTTornado Warning Tornado observedBMXBlount44 min
Mar 17, 5:23 PM CDTTornado WarningBMXDallas, Marengo, Perry67 min
Mar 17, 5:26 PM CDTAreal Flood AdvisoryBMXAutauga, Chilton, Dallas, Hale, Marengo, Perry and 1 more3 hr
Mar 17, 5:42 PM CDTTornado WarningBMXChilton, Coosa, Shelby, Talladega48 min
Mar 17, 5:48 PM CDTTornado WarningBMXBlount42 min
Mar 17, 5:56 PM CDTAreal Flood AdvisoryBMXWalker, Winston44 min
Mar 17, 6:09 PM CDTTornado WarningBMXChilton, Coosa, Shelby, Talladega13 min
Mar 17, 6:40 PM CDTFlash Flood WarningBMXWalker, Winston3 hr
Mar 17, 6:48 PM CDTTornado WarningBMXDallas42 min

Nearby

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