Alert archive / Alabama / Areal Flood Advisories in 2021

Areal Flood Advisory 286, NWS Mobile, AL

October 21, 2021Conecuh County, Monroe County, Alabama

NWS Mobile, AL issued this areal flood advisory at Oct 21, 2021, 2:10 PM CDT for Conecuh County, Monroe County, Alabama. It was in force for 3 hr.

The area

The counties it named.

The facts

Issued: Oct 21, 2021, 2:10 PM CDT (19:10 UTC)
Expired: Oct 21, 2021, 5:15 PM CDT
In force: 3 hr
Issued by: NWS Mobile, AL
Area: Storm-based polygon

Counties Conecuh County, AL, Monroe County, AL

The radar

The Mobile radar (KMOB), 136 km from the middle of the area, began a volume at 19:12 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, 7.2 hours before the alert went out and 278 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: 2559 J/kg
Mixed-layer CIN: -2 J/kg
Mixed-layer LCL: 516 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 70 m²/s²
0-3 km storm-relative helicity: 88 m²/s²
Significant tornado parameter: 0.6
Supercell composite: 3.6

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this areal flood advisory went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Mobile, AL wrote its last area forecast discussion before this areal flood advisory went out at Oct 21, 1:58 PM CDT, 12 minutes earlier.

Area forecast discussion, Oct 21, 1:58 PM CDT, 12 minutes before

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In the hours before

Special weather statement, Oct 21, 11:07 AM CDT, 3 hours 3 minutes before

Special Weather Statement
National Weather Service Mobile AL
1107 AM CDT Thu Oct 21 2021

MSZ079-211700-
George MS-
1107 AM CDT Thu Oct 21 2021

...A strong thunderstorm will impact portions of George County
through NOON CDT...

At 1106 AM CDT, National Weather Service doppler radar indicated a
strong thunderstorm 13 miles southwest of Lucedale, moving east at 10
mph.

HAZARD...Winds in excess of 30 mph.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects.

Locations impacted include...
Lucedale.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

&&

LAT...LON 3082 8888 3100 8879 3097 8844 3074 8852
      3073 8881 3074 8889
TIME...MOT...LOC 1606Z 285DEG 9KT 3084 8879

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...30 MPH

Special weather statement, Oct 21, 12:00 PM CDT, 2 hours 10 minutes before

Special Weather Statement
National Weather Service Mobile AL
1200 PM CDT Thu Oct 21 2021

ALZ263-265-211745-
Mobile Coastal AL-Mobile Central AL-
1200 PM CDT Thu Oct 21 2021

...A strong thunderstorm will impact portions of southwestern Mobile
County through 1245 PM CDT...

At 1159 AM CDT, National Weather Service doppler radar indicated a
strong thunderstorm over Grand Bay, moving east at 15 mph.

HAZARD...Winds in excess of 30 mph and pea size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor damage to outdoor objects is
         possible.

Locations impacted include...
Tillmans Corner, Theodore and Grand Bay.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

Torrential rainfall is also occurring with this storm and may lead to
localized flooding. Do not drive your vehicle through flooded
roadways.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 3061 8841 3064 8817 3062 8811 3060 8812
      3060 8811 3059 8811 3059 8812 3057 8810
      3057 8809 3054 8808 3051 8810 3043 8811
      3042 8840
TIME...MOT...LOC 1659Z 271DEG 13KT 3051 8833

MAX HAIL SIZE...0.25 IN
MAX WIND GUST...30 MPH

The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 21, 10:31 AM CDT	Areal Flood Advisory	MOB	Mobile	3 hr
Oct 21, 12:00 PM CDT	Special Weather Statement	MOB	Mobile	45 min
Oct 21, 12:26 PM CDT	Areal Flood Advisory	MOB	Mobile	3 hr
Oct 21, 12:29 PM CDT	Special Marine Warning	MOB		61 min
Oct 20, 7:25 PM CDT	Special Weather Statement	MOB	Wayne	50 min
Oct 20, 8:14 PM CDT	Special Weather Statement	MOB	Wayne	46 min
Oct 21, 11:07 AM CDT	Special Weather Statement	MOB	George	53 min
Oct 21, 11:27 AM CDT	Areal Flood Advisory	MOB	George	3 hr

Nearby

Areal Flood Advisories in Alabama, 2021 Every areal flood advisory 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.