Alert archive / Alabama / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 128, NWS Mobile, AL

May 12, 2021Covington County, Crenshaw County, Alabama

NWS Mobile, AL issued this severe thunderstorm warning at May 12, 2021, 6:56 AM CDT for Covington County, Crenshaw County, Alabama. It was in force for 35 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: May 12, 2021, 6:56 AM CDT (11:56 UTC)
Expired: May 12, 2021, 7:31 AM CDT
In force: 35 min
Issued by: NWS Mobile, AL
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Covington County, AL, Crenshaw County, AL

The radar

The Ft Rucker radar (KEOX), 73 km from the middle of the area, began a volume at 11:55 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, 11.9 hours before the alert went out and 191 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: 100 J/kg
Mixed-layer CIN: -40 J/kg
Mixed-layer LCL: 819 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 47 m²/s²
0-3 km storm-relative helicity: 77 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

As transmitted.

703 
WUUS54 KMOB 121156
SVRMOB
ALC039-041-121315-
/O.NEW.KMOB.SV.W.0128.210512T1156Z-210512T1315Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mobile AL
656 AM CDT Wed May 12 2021

The National Weather Service in Mobile has issued a

* Severe Thunderstorm Warning for...
  Southern Crenshaw County in south central Alabama...
  Northeastern Covington County in south central Alabama...

* Until 815 AM CDT.

* At 655 AM CDT, a severe thunderstorm was located 7 miles southeast
  of Dozier, or 8 miles north of Opp, moving northeast at 70 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Opp, Brantley, Dozier, Heath, Gantt and Glenwood. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3153 8616 3153 8620 3121 8619 3125 8645
      3149 8658 3169 8615 3166 8615 3166 8616
      3162 8618 3162 8615 3154 8614
TIME...MOT...LOC 1155Z 239DEG 79KT 3140 8631 

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

1 follow-up statement

565 
WWUS54 KMOB 121231
SVSMOB

Severe Weather Statement
National Weather Service Mobile AL
731 AM CDT Wed May 12 2021

ALC039-041-121241-
/O.CAN.KMOB.SV.W.0128.000000T0000Z-210512T1315Z/
Crenshaw AL-Covington AL-
731 AM CDT Wed May 12 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN CRENSHAW AND
NORTHEASTERN COVINGTON COUNTIES IS CANCELLED...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning has been cancelled.  However heavy rain is
still possible. 

LAT...LON 3153 8616 3153 8620 3121 8619 3125 8645
      3149 8658 3169 8615 3166 8615 3166 8616
      3162 8618 3162 8615 3154 8614
TIME...MOT...LOC 1228Z 239DEG 79KT 3181 8551 

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
May 12, 2:55 AM CDT	Special Weather Statement	MOB	Washington	65 min
May 12, 3:31 AM CDT	Special Weather Statement	MOB	Baldwin, Mobile	44 min
May 12, 3:46 AM CDT	Flash Flood Warning	MOB	Clarke, Washington	4 hr
May 12, 4:06 AM CDT	Special Weather Statement	MOB	Baldwin, Mobile	54 min
May 12, 4:12 AM CDT	Areal Flood Advisory	MOB	Baldwin, Mobile	3 hr
May 12, 4:20 AM CDT	Special Marine Warning	MOB		85 min
May 12, 4:41 AM CDT	Special Marine Warning	MOB		94 min
May 12, 4:56 AM CDT	Severe Thunderstorm Warning	MOB	Mobile	24 min
May 12, 5:01 AM CDT	Areal Flood Advisory	MOB	Baldwin, Escambia	3 hr
May 12, 5:04 AM CDT	Special Weather Statement	MOB	Baldwin, Escambia	86 min
May 12, 6:01 AM CDT	Severe Thunderstorm Warning	MOB	Conecuh, Covington, Escambia	44 min
May 12, 6:24 AM CDT	Special Marine Warning	MOB		96 min
May 12, 6:29 AM CDT	Severe Thunderstorm Warning	MOB	Covington	64 min
May 12, 6:35 AM CDT	Special Marine Warning	MOB		55 min
May 12, 6:52 AM CDT	Areal Flood Advisory	MOB	Conecuh, Covington, Escambia	3 hr
May 12, 7:18 AM CDT	Special Marine Warning	MOB		87 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.