Alert archive / Alabama / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 24, NWS Mobile, AL

March 17, 20215 counties in Alabama

NWS Mobile, AL issued this severe thunderstorm warning at Mar 17, 2021, 10:31 PM CDT for 5 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, 10:31 PM CDT (03:31 UTC)
Expired
Mar 17, 2021, 11:15 PM CDT
In force
44 min
Issued by
NWS Mobile, AL
Area
Storm-based polygon
Hail
0.75 in
Wind
60.0 mph

Counties Baldwin County, AL, Clarke County, AL, Mobile County, AL, Monroe County, AL, Washington County, AL

The radar

The Mobile radar (KMOB), 115 km from the middle of the area, began a volume at 03:34 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, 6:48 PM CDTTornado Watch PDSSPC8 hr

The nearest sounding before it

Birmingham, AL (KBMX), launched 00:00Z, 3.5 hours before the alert went out and 201 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 00:00Z on 2021-03-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 188 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 00:00Z on 2021-03-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 336 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
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.

480 
WUUS54 KMOB 180331
SVRMOB
ALC003-025-097-099-129-180415-
/O.NEW.KMOB.SV.W.0024.210318T0331Z-210318T0415Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mobile AL
1031 PM CDT Wed Mar 17 2021

The National Weather Service in Mobile has issued a

* Severe Thunderstorm Warning for...
  Monroe County in south central Alabama...
  Northwestern Mobile County in southwestern Alabama...
  Northwestern Baldwin County in southwestern Alabama...
  Southeastern Washington County in southwestern Alabama...
  Central Clarke County in southwestern Alabama...

* Until 1115 PM CDT.

* At 1030 PM CDT, severe thunderstorms were located along a line
  extending from 5 miles southeast of Wagarville to near McIntosh to
  3 miles south of Citronelle, moving northeast at 60 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Monroeville, Jackson, Citronelle, Frisco City, Peterman,
  Wagarville, Leroy, Gulfcrest, Uriah, Whatley, Calvert, Mount
  Vernon, Excel, Beatrice, McIntosh and Movico.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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 3183 8706 3171 8702 3172 8705 3168 8706
      3164 8714 3152 8717 3146 8720 3145 8723
      3140 8730 3132 8736 3123 8757 3124 8762
      3122 8762 3102 8812 3097 8836 3124 8823
      3147 8815 3183 8726
TIME...MOT...LOC 0330Z 246DEG 51KT 3138 8796 3124 8807 3105 8821 

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

21/CL
1 follow-up statement
241 
WWUS54 KMOB 180410
SVSMOB

Severe Weather Statement
National Weather Service Mobile AL
1110 PM CDT Wed Mar 17 2021

ALC003-025-097-099-129-180419-
/O.EXP.KMOB.SV.W.0024.000000T0000Z-210318T0415Z/
Monroe AL-Mobile AL-Baldwin AL-Washington AL-Clarke AL-
1110 PM CDT Wed Mar 17 2021

...THE SEVERE THUNDERSTORM WARNING FOR MONROE...NORTHWESTERN
MOBILE...NORTHWESTERN BALDWIN...SOUTHEASTERN WASHINGTON AND CENTRAL
CLARKE COUNTIES WILL EXPIRE AT 1115 PM CDT...

The storms which prompted the warning have weakened. Therefore, the 
warning will be allowed to expire.

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

LAT...LON 3183 8706 3171 8702 3172 8705 3168 8706
      3164 8714 3152 8717 3146 8720 3145 8723
      3140 8730 3132 8736 3123 8757 3124 8762
      3122 8762 3102 8812 3097 8836 3124 8823
      3147 8815 3183 8726
TIME...MOT...LOC 0409Z 246DEG 51KT 3160 8738 3146 8749 3127 8763 

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Mar 17, 7:10 PM CDTSevere Thunderstorm WarningMOBChoctaw, Washington65 min
Mar 17, 8:07 PM CDTSpecial Weather StatementMOBChoctaw, Washington53 min
Mar 17, 8:31 PM CDTSevere Thunderstorm WarningMOBClarke, Monroe, Washington, Wilcox44 min
Mar 17, 9:15 PM CDTSpecial Weather StatementMOBButler, Monroe, Wilcox45 min
Mar 17, 9:27 PM CDTSpecial Weather StatementMOBClarke, Monroe, Washington48 min
Mar 17, 9:55 PM CDTSevere Thunderstorm WarningMOBButler, Crenshaw50 min
Mar 17, 10:17 PM CDTSpecial Weather StatementMOBMonroe, Washington58 min
Mar 17, 11:12 PM CDTSpecial Weather StatementMOBBaldwin, Mobile48 min
Mar 17, 11:28 PM CDTSpecial Marine WarningMOB92 min
Mar 18, 12:02 AM CDTSpecial Weather StatementMOBMonroe43 min
Mar 18, 12:07 AM CDTSpecial Weather StatementMOBMobile23 min
Mar 18, 12:32 AM CDTSevere Thunderstorm WarningMOBBaldwin28 min
Mar 18, 12:33 AM CDTSpecial Marine WarningMOB87 min
Mar 18, 12:38 AM CDTSpecial Weather StatementMOBButler37 min
Mar 18, 12:57 AM CDTSpecial Marine WarningMOB63 min
Mar 18, 1:48 AM CDTSpecial Marine WarningMOB87 min
Mar 18, 3:16 AM CDTSpecial Marine WarningMOB89 min
Mar 18, 4:00 AM CDTTornado WarningMOBCrenshaw30 min
Mar 18, 4:09 AM CDTSpecial Marine WarningMOB51 min

Nearby

Severe Thunderstorm Warnings in Alabama, 2021Every 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.