Alert archive / Alabama / Areal Flood Advisories in 2021

Areal Flood Advisory 135, NWS Mobile, AL

July 18, 20214 counties in Alabama

NWS Mobile, AL issued this areal flood advisory at Jul 18, 2021, 5:19 PM CDT for 4 counties in Alabama. It was in force for 116 min.

The area

The counties it named.

The facts

Issued: Jul 18, 2021, 5:19 PM CDT (22:19 UTC)
Expired: Jul 18, 2021, 7:15 PM CDT
In force: 116 min
Issued by: NWS Mobile, AL
Area: Storm-based polygon

Counties Choctaw County, AL, Clarke County, AL, Washington County, AL, Wilcox County, AL

The radar

The Mobile radar (KMOB), 126 km from the middle of the area, began a volume at 22:23 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 12:00Z, 10.3 hours before the alert went out and 214 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: 505 J/kg
Mixed-layer CIN: -58 J/kg
Mixed-layer LCL: 870 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: 43 m²/s²
0-3 km storm-relative helicity: 48 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 Jul 18, 3:52 PM CDT, 1 hour 27 minutes earlier.

Area forecast discussion, Jul 18, 3:52 PM CDT, 1 hour 27 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
Jul 18, 2:39 PM CDT	Areal Flood Advisory	MOB	Washington	3 hr
Jul 18, 3:16 PM CDT	Areal Flood Advisory	MOB	Clarke, Monroe	119 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.