Alert archive / Mississippi / Areal Flood Advisories in 2021

Areal Flood Advisory 219, NWS Mobile, AL

September 17, 20214 counties in Mississippi

NWS Mobile, AL issued this areal flood advisory at Sep 17, 2021, 7:17 AM CDT for 4 counties in Mississippi. It was in force for 3 hr.

The area

The counties it named.

The facts

Issued: Sep 17, 2021, 7:17 AM CDT (12:17 UTC)
Expired: Sep 17, 2021, 10:30 AM CDT
In force: 3 hr
Issued by: NWS Mobile, AL
Area: Storm-based polygon

Counties George County, MS, Greene County, MS, Perry County, MS, Stone County, MS

The radar

The Mobile radar (KMOB), 69 km from the middle of the area, began a volume at 12:20 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, 0.3 hours before the alert went out and 117 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: 1826 J/kg
Mixed-layer CIN: -9 J/kg
Mixed-layer LCL: 687 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: 68 m²/s²
0-3 km storm-relative helicity: 70 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 Sep 17, 7:01 AM CDT, 16 minutes earlier.

Area forecast discussion, Sep 17, 7:01 AM CDT, 16 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
Sep 17, 5:37 AM CDT	Areal Flood Advisory	MOB	Baldwin	3 hr
Sep 17, 6:59 AM CDT	Areal Flood Advisory	MOB	Escambia	3 hr
Sep 17, 12:41 PM CDT	Areal Flood Advisory	MOB	Baldwin, Escambia	3 hr
Sep 17, 2:50 PM CDT	Special Weather Statement	MOB	Mobile	40 min
Sep 17, 3:16 PM CDT	Special Weather Statement	MOB	Mobile	44 min
Sep 17, 3:32 PM CDT	Areal Flood Advisory	MOB	Mobile, Washington	3 hr
Sep 17, 8:27 AM CDT	Areal Flood Advisory	MOB	Okaloosa, Santa Rosa	2 hr
Sep 17, 9:33 AM CDT	Areal Flood Advisory	MOB	Okaloosa	2 hr
Sep 17, 9:46 AM CDT	Flash Flood Warning	MOB	Okaloosa	4 hr
Sep 17, 8:27 AM CDT	Flash Flood Warning	MOB	Stone	6 hr
Sep 17, 10:11 AM CDT	Flash Flood Warning	MOB	George	5 hr

Nearby

Areal Flood Advisories in Mississippi, 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.