Alert archive / Alabama / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 252, NWS Mobile, AL

August 18, 2020Baldwin County, Alabama

NWS Mobile, AL issued this severe thunderstorm warning at Aug 18, 2020, 6:07 PM CDT for Baldwin County, Alabama. It was in force for 53 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 18, 2020, 6:07 PM CDT (23:07 UTC)
Expired: Aug 18, 2020, 7:00 PM CDT
In force: 53 min
Issued by: NWS Mobile, AL
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

County Baldwin County, AL

The radar

The Mobile radar (KMOB), 63 km from the middle of the area, began a volume at 23:10 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, 11.1 hours before the alert went out and 210 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: 1340 J/kg
Mixed-layer CIN: -65 J/kg
Mixed-layer LCL: 1093 m above ground
0-6 km bulk shear: 9 kt
0-1 km storm-relative helicity: -5 m²/s²
0-3 km storm-relative helicity: 14 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

101 
WUUS54 KMOB 182307
SVRMOB
ALC003-190000-
/O.NEW.KMOB.SV.W.0252.200818T2307Z-200819T0000Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mobile AL
607 PM CDT Tue Aug 18 2020

The National Weather Service in Mobile has issued a

* Severe Thunderstorm Warning for...
  North central Baldwin County in southwestern Alabama...

* Until 700 PM CDT.

* At 607 PM CDT, a severe thunderstorm was located 5 miles northeast
  of Bay Minette, moving north at 5 mph.

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

  SOURCE...Radar indicated.

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

* This severe thunderstorm will remain over mainly rural areas of
  north central Baldwin County.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3087 8771 3106 8785 3106 8762 3100 8762
      3100 8760 3097 8759 3087 8764
TIME...MOT...LOC 2307Z 173DEG 5KT 3092 8768 

HAIL...0.75IN
WIND...60MPH
 
$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 18, 1:08 PM CDT	Special Marine Warning	MOB		67 min
Aug 18, 2:52 PM CDT	Special Marine Warning	MOB		53 min
Aug 18, 3:39 PM CDT	Special Weather Statement	MOB	Mobile	36 min
Aug 18, 3:52 PM CDT	Severe Thunderstorm Warning	MOB	Mobile	38 min
Aug 18, 3:57 PM CDT	Severe Thunderstorm Warning	MOB	Baldwin	20 min
Aug 18, 4:06 PM CDT	Special Marine Warning	MOB		24 min
Aug 18, 4:59 PM CDT	Special Marine Warning	MOB		31 min
Aug 18, 5:50 PM CDT	Special Weather Statement	MOB	Escambia	55 min

Nearby

Severe Thunderstorm Warnings in Alabama, 2020 Every severe thunderstorm warning in 2020

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.