Alert archive / Alabama / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 21, NWS Mobile, AL

March 17, 20214 counties in Alabama

NWS Mobile, AL issued this severe thunderstorm warning at Mar 17, 2021, 8:31 PM CDT for 4 counties in Alabama. It was in force for 44 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, 8:31 PM CDT (01:31 UTC)
Expired: Mar 17, 2021, 9:15 PM CDT
In force: 44 min
Issued by: NWS Mobile, AL
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Clarke County, AL, Monroe County, AL, Washington County, AL, Wilcox County, AL

The radar

The Birmingham radar (KBMX), 139 km from the middle of the area, began a volume at 01:30 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, 1.5 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-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.

581 
WUUS54 KMOB 180131
SVRMOB
ALC025-099-129-131-180215-
/O.NEW.KMOB.SV.W.0021.210318T0131Z-210318T0215Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mobile AL
831 PM CDT Wed Mar 17 2021

The National Weather Service in Mobile has issued a

* Severe Thunderstorm Warning for...
  Northwestern Monroe County in south central Alabama...
  Northeastern Washington County in southwestern Alabama...
  Clarke County in southwestern Alabama...
  Wilcox County in south central Alabama...

* Until 915 PM CDT.

* At 831 PM CDT, severe thunderstorms were located along a line
  extending from Wayne to 5 miles west of Thomasville to near Leroy
  to 6 miles northwest of McIntosh, moving northeast at 60 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Jackson, Thomasville, Camden, Grove Hill, Wagarville, Leroy,
  Whatley, Pine Hill, Vredenburgh, Fulton and Yellow Bluff.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 300 AM CDT for south central
and southwestern Alabama.

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

&&

LAT...LON 3227 8744 3225 8742 3224 8739 3220 8736
      3220 8733 3214 8728 3214 8725 3212 8726
      3208 8719 3205 8716 3185 8719 3147 8740
      3132 8809 3199 8790 3199 8767 3200 8763
      3213 8762 3213 8752 3226 8752 3227 8751
TIME...MOT...LOC 0131Z 239DEG 51KT 3213 8780 3192 8784 3149 8793 3135
8809

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

Black

1 follow-up statement

063 
WWUS54 KMOB 180159
SVSMOB

Severe Weather Statement
National Weather Service Mobile AL
859 PM CDT Wed Mar 17 2021

ALC129-180208-
/O.CAN.KMOB.SV.W.0021.000000T0000Z-210318T0215Z/
Washington AL-
859 PM CDT Wed Mar 17 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN WASHINGTON COUNTY
IS CANCELLED...

The storms which prompted the warning have moved out of the warned 
area. Therefore, the warning has been cancelled.

A Tornado Watch remains in effect until 300 AM CDT for south central
and southwestern Alabama.

LAT...LON 3220 8736 3220 8733 3214 8728 3214 8725
      3212 8726 3205 8716 3185 8719 3147 8740
      3139 8778 3171 8771 3196 8770 3201 8762
      3213 8762 3213 8752 3226 8752 3227 8744
TIME...MOT...LOC 0158Z 239DEG 51KT 3232 8742 3211 8746 3168 8755 3154
8771

$$

ALC025-099-131-180215-
/O.CON.KMOB.SV.W.0021.000000T0000Z-210318T0215Z/
Monroe AL-Clarke AL-Wilcox AL-
859 PM CDT Wed Mar 17 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 915 PM CDT
FOR NORTHWESTERN MONROE...NORTHEASTERN CLARKE AND WILCOX COUNTIES...

At 858 PM CDT, severe thunderstorms were located along a line
extending from near Central Mills to 10 miles north of Yellow Bluff
to 12 miles southeast of Fulton to 7 miles south of Whatley, moving
northeast at 60 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

Locations impacted include...
Camden, Whatley, Pine Hill, Vredenburgh and Yellow Bluff. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 300 AM CDT for south central
and southwestern Alabama.

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

&&

LAT...LON 3220 8736 3220 8733 3214 8728 3214 8725
      3212 8726 3205 8716 3185 8719 3147 8740
      3139 8778 3171 8771 3196 8770 3201 8762
      3213 8762 3213 8752 3226 8752 3227 8744
TIME...MOT...LOC 0158Z 239DEG 51KT 3232 8742 3211 8746 3168 8755 3154
8771

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

Black

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 17, 7:10 PM CDT	Severe Thunderstorm Warning	MOB	Choctaw, Washington	65 min
Mar 17, 8:07 PM CDT	Special Weather Statement	MOB	Choctaw, Washington	53 min
Mar 17, 9:15 PM CDT	Special Weather Statement	MOB	Butler, Monroe, Wilcox	45 min
Mar 17, 9:27 PM CDT	Special Weather Statement	MOB	Clarke, Monroe, Washington	48 min
Mar 17, 9:55 PM CDT	Severe Thunderstorm Warning	MOB	Butler, Crenshaw	50 min
Mar 17, 10:17 PM CDT	Special Weather Statement	MOB	Monroe, Washington	58 min
Mar 17, 10:31 PM CDT	Severe Thunderstorm Warning	MOB	Baldwin, Clarke, Mobile, Monroe, Washington	44 min
Mar 17, 11:12 PM CDT	Special Weather Statement	MOB	Baldwin, Mobile	48 min
Mar 17, 11:28 PM CDT	Special Marine Warning	MOB		92 min
Mar 18, 12:02 AM CDT	Special Weather Statement	MOB	Monroe	43 min
Mar 18, 12:07 AM CDT	Special Weather Statement	MOB	Mobile	23 min
Mar 18, 12:32 AM CDT	Severe Thunderstorm Warning	MOB	Baldwin	28 min
Mar 18, 12:33 AM CDT	Special Marine Warning	MOB		87 min
Mar 18, 12:38 AM CDT	Special Weather Statement	MOB	Butler	37 min
Mar 18, 12:57 AM CDT	Special Marine Warning	MOB		63 min
Mar 18, 1:48 AM CDT	Special Marine Warning	MOB		87 min
Mar 18, 3:16 AM CDT	Special Marine Warning	MOB		89 min
Mar 18, 4:00 AM CDT	Tornado Warning	MOB	Crenshaw	30 min
Mar 18, 4:09 AM CDT	Special Marine Warning	MOB		51 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.