Alert archive / Alabama / Tornado Warnings in 2021

Tornado Warning 66, NWS Mobile, AL

December 11, 2021Butler County, Crenshaw County, Alabama

NWS Mobile, AL issued this tornado warning at Dec 11, 2021, 9:55 AM CST for Butler County, Crenshaw County, Alabama. It was in force for 50 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: Dec 11, 2021, 9:55 AM CST (15:55 UTC)
Expired: Dec 11, 2021, 10:45 AM CST
In force: 50 min
Issued by: NWS Mobile, AL
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

Counties Butler County, AL, Crenshaw County, AL

The radar

The Maxwell AFB radar (KMXX), 88 km from the middle of the area, began a volume at 15:54 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 12:00Z, 3.9 hours before the alert went out and 147 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: 245 J/kg
Mixed-layer CIN: -11 J/kg
Mixed-layer LCL: 703 m above ground
0-6 km bulk shear: 63 kt
0-1 km storm-relative helicity: 325 m²/s²
0-3 km storm-relative helicity: 371 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 3.8

Open this sounding in Storm Lab

The text

As transmitted.

974 
WFUS54 KMOB 111555
TORMOB
ALC013-041-111645-
/O.NEW.KMOB.TO.W.0066.211211T1555Z-211211T1645Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Mobile AL
955 AM CST Sat Dec 11 2021

The National Weather Service in Mobile has issued a

* Tornado Warning for...
  Northeastern Butler County in south central Alabama...
  Northern Crenshaw County in south central Alabama...

* Until 1045 AM CST.
    
* At 955 AM CST, a severe thunderstorm capable of producing a tornado
  was located over Greenville, moving northeast at 30 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.

* This dangerous storm will be near...
  Highland Home around 1035 AM CST.
  Petrey around 1040 AM CST.

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 3183 8619 3171 8665 3181 8672 3197 8642
      3196 8641 3198 8640 3202 8632 3200 8630
      3197 8630 3197 8627 3186 8618
TIME...MOT...LOC 1555Z 241DEG 26KT 3179 8661 

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

$$

Black

3 follow-up statements

159 
WWUS54 KMOB 111607
SVSMOB

Severe Weather Statement
National Weather Service Mobile AL
1007 AM CST Sat Dec 11 2021

ALC013-041-111645-
/O.CON.KMOB.TO.W.0066.000000T0000Z-211211T1645Z/
Butler AL-Crenshaw AL-
1007 AM CST Sat Dec 11 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 1045 AM CST FOR
NORTHEASTERN BUTLER AND NORTHERN CRENSHAW COUNTIES...
    
At 1007 AM CST, a severe thunderstorm capable of producing a tornado
was located 5 miles east of Greenville, moving northeast at 30 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.

This dangerous storm will be near...
  Highland Home around 1035 AM CST.
  Petrey around 1040 AM CST.

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 3183 8619 3177 8652 3185 8660 3197 8642
      3196 8641 3198 8640 3202 8632 3200 8630
      3197 8630 3197 8627 3186 8618
TIME...MOT...LOC 1607Z 241DEG 26KT 3183 8652 

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

$$

Black

003 
WWUS54 KMOB 111619
SVSMOB

Severe Weather Statement
National Weather Service Mobile AL
1019 AM CST Sat Dec 11 2021

ALC013-111629-
/O.CAN.KMOB.TO.W.0066.000000T0000Z-211211T1645Z/
Butler AL-
1019 AM CST Sat Dec 11 2021

...THE TORNADO WARNING FOR NORTHEASTERN BUTLER COUNTY IS CANCELLED...
    
The tornadic thunderstorm which prompted the warning has moved out 
of the warned area. Therefore, the warning has been cancelled.

LAT...LON 3184 8621 3181 8640 3186 8645 3192 8645
      3195 8642 3195 8640 3197 8638 3201 8632
      3200 8630 3197 8630 3196 8627 3187 8619
TIME...MOT...LOC 1619Z 242DEG 27KT 3188 8640 

$$

ALC041-111645-
/O.CON.KMOB.TO.W.0066.000000T0000Z-211211T1645Z/
Crenshaw AL-
1019 AM CST Sat Dec 11 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 1045 AM CST FOR NORTHERN
CRENSHAW COUNTY...
    
At 1019 AM CST, a severe thunderstorm capable of producing a tornado
was located 7 miles southwest of Highland Home, or 12 miles southeast
of Fort Deposit, moving northeast at 30 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.

This dangerous storm will be near...
  Highland Home around 1030 AM CST.
  Petrey around 1035 AM CST.

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 3184 8621 3181 8640 3186 8645 3192 8645
      3195 8642 3195 8640 3197 8638 3201 8632
      3200 8630 3197 8630 3196 8627 3187 8619
TIME...MOT...LOC 1619Z 242DEG 27KT 3188 8640 

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

$$

Black

417 
WWUS54 KMOB 111640
SVSMOB

Severe Weather Statement
National Weather Service Mobile AL
1040 AM CST Sat Dec 11 2021

ALC041-111650-
/O.EXP.KMOB.TO.W.0066.000000T0000Z-211211T1645Z/
Crenshaw AL-
1040 AM CST Sat Dec 11 2021

...THE TORNADO WARNING FOR NORTHERN CRENSHAW COUNTY WILL EXPIRE AT
1045 AM CST...
        
The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore, the warning will
be allowed to expire.

LAT...LON 3184 8621 3181 8640 3186 8645 3192 8645
      3195 8642 3195 8640 3197 8638 3201 8632
      3200 8630 3197 8630 3196 8627 3187 8619
TIME...MOT...LOC 1640Z 241DEG 26KT 3195 8625 

$$

Black

The office that day

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

Issued	Product	Office	Counties	Lasted
Dec 11, 11:21 AM CST	Special Weather Statement	MOB	Crenshaw	39 min
Dec 11, 12:56 PM CST	Special Weather Statement	MOB	Crenshaw	49 min
Dec 11, 1:21 PM CST	Special Weather Statement	MOB	Covington	39 min
Dec 11, 2:20 PM CST	Special Weather Statement	MOB	Covington	40 min

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.