Alert archive / Alabama / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 16, NWS Mobile, AL

March 17, 2021Clarke County, Alabama

NWS Mobile, AL issued this severe thunderstorm warning at Mar 17, 2021, 5:15 PM CDT for Clarke County, Alabama. It was in force for 30 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, 5:15 PM CDT (22:15 UTC)
Expired
Mar 17, 2021, 5:45 PM CDT
In force
30 min
Issued by
NWS Mobile, AL
Area
Storm-based polygon
Tornado
Possible
Hail
1.0 in
Wind
60.0 mph

County Clarke County, AL

The radar

The Mobile radar (KMOB), 140 km from the middle of the area, began a volume at 22:16 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, 11:36 AM CDTTornado Watch PDSSPC7 hr

The nearest sounding before it

Birmingham, AL (KBMX), launched 12:00Z, 10.3 hours before the alert went out and 174 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 12:00Z on 2021-03-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 658 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Birmingham, AL at 12:00Z on 2021-03-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 169 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
658 J/kg
Mixed-layer CIN
-112 J/kg
Mixed-layer LCL
759 m above ground
0-6 km bulk shear
59 kt
0-1 km storm-relative helicity
169 m²/s²
0-3 km storm-relative helicity
301 m²/s²
Significant tornado parameter
0.0
Supercell composite
2.1

Open this sounding in Storm Lab

The text

As transmitted.

949 
WUUS54 KMOB 172215
SVRMOB
ALC025-172245-
/O.NEW.KMOB.SV.W.0016.210317T2215Z-210317T2245Z/

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

The National Weather Service in Mobile has issued a

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

* Until 545 PM CDT.

* At 515 PM CDT, a severe thunderstorm was located 8 miles northeast
  of Coffeeville, or 13 miles northwest of Grove Hill, moving
  northeast at 40 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.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 700 PM CDT for southwestern
Alabama.

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

This thunderstorm is capable of producing all types of severe weather
including extremely large hail, destructive straight line winds and
tornadoes. Move quickly to a safe shelter such as an interior room, a
bathroom, closet or basement.

&&

LAT...LON 3191 8767 3171 8799 3181 8810 3199 8789
      3199 8767
TIME...MOT...LOC 2215Z 228DEG 36KT 3182 8796 

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

Black
1 follow-up statement
689 
WWUS54 KMOB 172232
SVSMOB

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

ALC025-172245-
/O.CON.KMOB.SV.W.0016.000000T0000Z-210317T2245Z/
Clarke AL-
532 PM CDT Wed Mar 17 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 545 PM CDT
FOR NORTH CENTRAL CLARKE COUNTY...

At 532 PM CDT, a severe thunderstorm was located 4 miles west of
Thomasville, moving northeast at 40 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.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 700 PM CDT for southwestern
Alabama.

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

This thunderstorm is capable of producing all types of severe weather
including extremely large hail, destructive straight line winds and
tornadoes. Move quickly to a safe shelter, such as an interior room,
a bathroom or closet or basement.

&&

LAT...LON 3191 8767 3182 8782 3191 8797 3199 8789
      3199 8767
TIME...MOT...LOC 2232Z 228DEG 36KT 3194 8781 

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

Black

The office that day

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

IssuedProductOfficeCountiesLasted
Mar 16, 9:23 PM CDTAreal Flood WarningMOBChoctaw, Clarke, Washington, Wilcox16 hr
Mar 16, 11:44 PM CDTSpecial Weather StatementMOBCovington46 min
Mar 17, 4:18 AM CDTHigh Surf AdvisoryMOBBaldwin, Mobile26 hr
Mar 17, 4:27 AM CDTFlash Flood WatchMOBChoctaw, Clarke, Wilcox18 hr
Mar 17, 10:36 AM CDTRiver Flood WarningMOBChoctaw, Clarke, Washington32 days
Mar 17, 10:39 AM CDTRiver Flood WarningMOBClarke, Washington32 days
Mar 17, 11:58 AM CDTTornado WarningMOBChoctaw47 min
Mar 17, 12:59 PM CDTSevere Thunderstorm WarningMOBChoctaw46 min
Mar 17, 1:12 PM CDTTornado WarningMOBChoctaw48 min
Mar 17, 1:38 PM CDTTornado WarningMOBChoctaw37 min
Mar 17, 2:05 PM CDTSevere Thunderstorm WarningMOBChoctaw, Clarke40 min
Mar 17, 2:16 PM CDTSevere Thunderstorm WarningMOBChoctaw44 min
Mar 17, 2:19 PM CDTFlash Flood WarningMOBChoctaw, Clarke, Washington6 hr
Mar 17, 2:34 PM CDTSevere Thunderstorm WarningMOBChoctaw, Clarke, Washington56 min
Mar 17, 2:36 PM CDTTornado WarningMOBClarke39 min
Mar 17, 2:38 PM CDTTornado WarningMOBChoctaw52 min
Mar 17, 3:28 PM CDTSevere Thunderstorm WarningMOBChoctaw47 min
Mar 17, 3:46 PM CDTTornado WarningMOBChoctaw44 min
Mar 17, 3:55 PM CDTSevere Thunderstorm WarningMOBWilcox20 min
Mar 17, 4:00 PM CDTTornado WarningMOBWilcox14 min
Mar 17, 4:04 PM CDTTornado WarningMOBChoctaw, Washington26 min
Mar 17, 4:17 PM CDTTornado Warning Tornado observedConsiderable damage threatMOBChoctaw, Clarke43 min
Mar 17, 5:20 PM CDTTornado WarningMOBClarke, Wilcox40 min
Mar 17, 5:53 PM CDTTornado WarningMOBWilcox37 min
Mar 17, 5:54 PM CDTFlash Flood WarningMOBClarke, Wilcox6 hr
Mar 17, 5:59 PM CDTSevere Thunderstorm WarningMOBClarke, Wilcox46 min
Mar 17, 6:08 PM CDTTornado WarningMOBWilcox22 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.