Alert archive / Alabama / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 193, NWS Mobile, AL

August 20, 2021Mobile County, Alabama

NWS Mobile, AL issued this severe thunderstorm warning at Aug 20, 2021, 4:19 PM CDT for Mobile County, Alabama. It was in force for 41 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: Aug 20, 2021, 4:19 PM CDT (21:19 UTC)
Expired: Aug 20, 2021, 5:00 PM CDT
In force: 41 min
Issued by: NWS Mobile, AL
Area: Storm-based polygon
Hail: 0.88 in
Wind: 60.0 mph

County Mobile County, AL

The radar

The Mobile radar (KMOB), 27 km from the middle of the area, began a volume at 21:21 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

Slidell Radar S, LA (KSIL), launched 12:00Z, 9.3 hours before the alert went out and 153 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: 1321 J/kg
Mixed-layer CIN: -23 J/kg
Mixed-layer LCL: 859 m above ground
0-6 km bulk shear: 8 kt
0-1 km storm-relative helicity: 7 m²/s²
0-3 km storm-relative helicity: 20 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

716 
WUUS54 KMOB 202119
SVRMOB
ALC097-202200-
/O.NEW.KMOB.SV.W.0193.210820T2119Z-210820T2200Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mobile AL
419 PM CDT Fri Aug 20 2021

The National Weather Service in Mobile has issued a

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

* Until 500 PM CDT.

* At 419 PM CDT, a severe thunderstorm was located 6 miles southwest
  of Gulfcrest, or 11 miles southwest of Citronelle, moving southeast
  at 10 mph.

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

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Chunchula and Gulfcrest. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3092 8842 3094 8842 3102 8834 3098 8804
      3073 8817
TIME...MOT...LOC 2119Z 294DEG 8KT 3094 8832 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.88 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

2 follow-up statements

085 
WWUS54 KMOB 202148
SVSMOB

Severe Weather Statement
National Weather Service Mobile AL
448 PM CDT Fri Aug 20 2021

ALC097-202200-
/O.CON.KMOB.SV.W.0193.000000T0000Z-210820T2200Z/
Mobile AL-
448 PM CDT Fri Aug 20 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 500 PM CDT
FOR NORTHWESTERN MOBILE COUNTY...

At 448 PM CDT, a severe thunderstorm was located near Chunchula, or
12 miles south of Citronelle, moving southeast at 10 mph.

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

SOURCE...Radar indicated.

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

Locations impacted include...
Chunchula.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3087 8835 3098 8830 3098 8804 3073 8817
TIME...MOT...LOC 2148Z 294DEG 8KT 3091 8825 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.88 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

820 
WWUS54 KMOB 202158
SVSMOB

Severe Weather Statement
National Weather Service Mobile AL
458 PM CDT Fri Aug 20 2021

ALC097-202208-
/O.EXP.KMOB.SV.W.0193.000000T0000Z-210820T2200Z/
Mobile AL-
458 PM CDT Fri Aug 20 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN MOBILE COUNTY
WILL EXPIRE AT 500 PM CDT...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning will be allowed to expire.

LAT...LON 3087 8835 3098 8830 3098 8804 3073 8817
TIME...MOT...LOC 2158Z 294DEG 8KT 3090 8823 

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 19, 7:38 PM CDT	Severe Thunderstorm Warning	MOB	Clarke, Washington	52 min
Aug 19, 7:46 PM CDT	Areal Flood Advisory	MOB	Choctaw, Clarke, Washington	3 hr
Aug 19, 8:19 PM CDT	Special Weather Statement	MOB	Clarke	56 min
Aug 19, 8:35 PM CDT	Flash Flood Warning	MOB	Choctaw, Clarke, Washington	3 hr
Aug 19, 8:52 PM CDT	Areal Flood Advisory	MOB	Clarke	3 hr
Aug 20, 12:38 PM CDT	Special Marine Warning	MOB		82 min
Aug 20, 12:42 PM CDT	Special Weather Statement	MOB	Baldwin	48 min
Aug 20, 2:39 PM CDT	Special Marine Warning	MOB		96 min
Aug 20, 2:40 PM CDT	Areal Flood Advisory	MOB	Escambia	3 hr
Aug 20, 3:08 PM CDT	Areal Flood Advisory	MOB	Baldwin, Escambia, Monroe	112 min
Aug 20, 3:21 PM CDT	Areal Flood Advisory	MOB	Conecuh, Escambia	114 min
Aug 20, 3:41 PM CDT	Areal Flood Advisory	MOB	Clarke, Washington	2 hr
Aug 20, 4:27 PM CDT	Areal Flood Advisory	MOB	Clarke, Monroe	2 hr
Aug 20, 5:23 PM CDT	Areal Flood Advisory	MOB	Mobile	4 hr
Aug 20, 6:02 PM CDT	Areal Flood Advisory	MOB	Mobile	3 hr
Aug 20, 6:12 PM CDT	Special Marine Warning	MOB		48 min
Aug 20, 6:47 PM CDT	Areal Flood Advisory	MOB	Baldwin	3 hr

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.