Alert archive / Alabama / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 38, NWS Mobile, AL

March 31, 2021Clarke County, Alabama

NWS Mobile, AL issued this severe thunderstorm warning at Mar 31, 2021, 1:29 PM CDT for Clarke County, Alabama. It was in force for 61 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 31, 2021, 1:29 PM CDT (18:29 UTC)
Expired: Mar 31, 2021, 2:30 PM CDT
In force: 61 min
Issued by: NWS Mobile, AL
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Clarke County, AL

The radar

The Mobile radar (KMOB), 134 km from the middle of the area, began a volume at 18:28 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 31, 1:32 PM CDT	TSTM WND DMG	1 Ese Whately, AL	TREE DOWN ON HWY 84 NEAR NELLIE HILL RD. TIME ESTIMATED BASED ON RADAR.

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 31, 11:19 AM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Birmingham, AL (KBMX), launched 12:00Z, 6.5 hours before the alert went out and 180 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: 455 J/kg
Mixed-layer CIN: -3 J/kg
Mixed-layer LCL: 527 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 273 m²/s²
0-3 km storm-relative helicity: 283 m²/s²
Significant tornado parameter: 0.6
Supercell composite: 3.5

Open this sounding in Storm Lab

The text

As transmitted.

859 
WUUS54 KMOB 311829
SVRMOB
ALC025-311930-
/O.NEW.KMOB.SV.W.0038.210331T1829Z-210331T1930Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mobile AL
129 PM CDT Wed Mar 31 2021

The National Weather Service in Mobile has issued a

* Severe Thunderstorm Warning for...
  Clarke County in southwestern Alabama...

* Until 230 PM CDT.

* At 129 PM CDT, severe thunderstorms were located along a line
  extending from 4 miles northeast of Crandall to 7 miles west of
  Gilbertown to 10 miles north of Waynesboro, moving east at 45 mph.

  HAZARD...60 mph wind gusts and quarter size hail.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Thomasville, Grove Hill, Whatley, Coffeeville and Fulton. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Large hail and damaging winds and continuous cloud to ground
lightning is occurring with these storms. Move indoors immediately.
Lightning is one of nature's leading killers. Remember, if you can
hear thunder, you are close enough to be struck by lightning.

&&

LAT...LON 3198 8767 3188 8767 3187 8762 3183 8762
      3183 8750 3170 8752 3170 8757 3156 8757
      3168 8808 3176 8810 3175 8814 3181 8818
      3190 8813 3193 8805 3194 8807 3192 8809
      3195 8812 3196 8807 3199 8807
TIME...MOT...LOC 1829Z 279DEG 39KT 3203 8849 3190 8845 3181 8858 

HAIL...1.00IN
WIND...60MPH
 
$$

JLH

1 follow-up statement

461 
WWUS54 KMOB 311849
SVSMOB

Severe Weather Statement
National Weather Service Mobile AL
149 PM CDT Wed Mar 31 2021

ALC025-311930-
/O.CON.KMOB.SV.W.0038.000000T0000Z-210331T1930Z/
Clarke AL-
149 PM CDT Wed Mar 31 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 230 PM CDT
FOR CLARKE COUNTY...

At 148 PM CDT, severe thunderstorms were located along a line
extending from 5 miles west of Putnam to 7 miles north of Coffeeville
to 6 miles east of Silas, moving east at 55 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...
Thomasville, Grove Hill, Whatley, Coffeeville and Fulton. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Continuous cloud to ground lightning is occurring with these storms.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.

&&

LAT...LON 3198 8767 3188 8767 3187 8762 3183 8762
      3183 8750 3170 8752 3170 8757 3156 8757
      3168 8808 3176 8810 3175 8814 3181 8818
      3190 8813 3193 8805 3194 8807 3192 8809
      3195 8812 3196 8807 3199 8807
TIME...MOT...LOC 1848Z 276DEG 55KT 3199 8813 3186 8809 3178 8822 

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

JLH

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 30, 7:45 PM CDT	Areal Flood Advisory	MOB	Washington	108 min
Mar 30, 8:55 PM CDT	River Flood Warning	MOB	Baldwin, Mobile	21 days
Mar 31, 3:35 AM CDT	Gale Watch	MOB		6 hr
Mar 31, 3:35 AM CDT	Gale Warning	MOB		33 hr
Mar 31, 3:35 AM CDT	Marine Dense Fog Advisory	MOB		8 hr
Mar 31, 3:35 AM CDT	Small Craft Advisory	MOB		57 hr
Mar 31, 12:25 PM CDT	Special Weather Statement	MOB	Choctaw	50 min
Mar 31, 12:51 PM CDT	Severe Thunderstorm Warning	MOB	Choctaw	54 min
Mar 31, 1:01 PM CDT	Tornado Warning	MOB	Choctaw	9 min
Mar 31, 1:43 PM CDT	Freeze Watch	MOB	Butler, Choctaw, Clarke, Conecuh, Crenshaw, Monroe and 2 more	13 hr
Mar 31, 1:43 PM CDT	Severe Thunderstorm Warning	MOB	Wilcox	47 min
Mar 31, 1:45 PM CDT	Severe Thunderstorm Warning	MOB	Choctaw	15 min
Mar 31, 2:04 PM CDT	Special Weather Statement	MOB	Washington	56 min
Mar 31, 2:14 PM CDT	Severe Thunderstorm Warning	MOB	Conecuh, Monroe, Wilcox	61 min
Mar 31, 3:15 PM CDT	Special Weather Statement	MOB	Butler, Crenshaw	60 min
Mar 31, 3:58 PM CDT	Severe Thunderstorm Warning	MOB	Butler, Crenshaw	33 min
Mar 31, 4:13 PM CDT	Severe Thunderstorm Warning	MOB	Covington	47 min
Mar 31, 4:30 PM CDT	Special Weather Statement	MOB	Baldwin, Covington, Escambia, Mobile	45 min
Mar 31, 4:40 PM CDT	Severe Thunderstorm Warning	MOB	Covington	44 min
Mar 31, 5:03 PM CDT	Special Marine Warning	MOB		42 min
Mar 31, 6:20 PM CDT	Special Marine Warning	MOB		26 min
Mar 31, 6:23 PM CDT	Special Marine Warning	MOB		65 min
Mar 31, 6:49 PM CDT	Special Marine Warning	MOB		62 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.