Alert archive / Alabama / Areal Flood Advisories in 2021

Areal Flood Advisory 298, NWS Mobile, AL

December 17, 2021Mobile County, Alabama

NWS Mobile, AL issued this areal flood advisory at Dec 17, 2021, 6:42 PM CST for Mobile County, Alabama. It was in force for 3 hr.

The area

The counties it named.

The facts

Issued: Dec 17, 2021, 6:42 PM CST (00:42 UTC)
Expired: Dec 17, 2021, 9:45 PM CST
In force: 3 hr
Issued by: NWS Mobile, AL
Area: Storm-based polygon

County Mobile County, AL

The radar

The Mobile radar (KMOB), 4 km from the middle of the area, began a volume at 00:44 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

Jackson, MS (KJAN), launched 00:00Z, 0.7 hours before the alert went out and 255 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: 251 J/kg
Mixed-layer CIN: -14 J/kg
Mixed-layer LCL: 722 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 82 m²/s²
0-3 km storm-relative helicity: 95 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.4

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 Dec 17, 3:49 PM CST, 2 hours 53 minutes earlier.

Area forecast discussion, Dec 17, 3:49 PM CST, 2 hours 53 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Dec 18, 5:35 AM CST	Marine Dense Fog Advisory	MOB		4 hr
Dec 18, 5:59 AM CST	Special Weather Statement	MOB	Wilcox	46 min
Dec 18, 12:57 PM CST	Areal Flood Advisory	MOB	Conecuh, Escambia	3 hr
Dec 18, 1:29 PM CST	Flash Flood Warning	MOB	Conecuh, Escambia	6 hr
Dec 18, 1:41 PM CST	Special Weather Statement	MOB	Baldwin	49 min
Dec 18, 1:47 PM CST	Special Weather Statement	MOB	Crenshaw	43 min
Dec 18, 1:56 PM CST	Areal Flood Advisory	MOB	Conecuh, Escambia	3 hr
Dec 18, 3:24 PM CST	Marine Dense Fog Advisory	MOB		10 hr
Dec 18, 4:54 PM CST	Areal Flood Advisory	MOB	Baldwin, Escambia, Mobile	3 hr
Dec 18, 5:01 PM CST	Special Weather Statement	MOB	Mobile	44 min
Dec 18, 5:59 PM CST	Areal Flood Advisory	MOB	Covington	3 hr
Dec 18, 11:15 AM CST	Special Weather Statement	MOB	George	45 min
Dec 18, 5:01 PM CST	Special Weather Statement	MOB	Perry	59 min
Dec 18, 5:46 PM CST	Special Weather Statement	MOB	Greene	59 min

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.