Alert archive / Alabama / Areal Flood Advisories in 2021

Areal Flood Advisory 237, NWS Mobile, AL

September 18, 2021Butler County, Crenshaw County, Alabama

NWS Mobile, AL issued this areal flood advisory at Sep 18, 2021, 6:13 PM CDT for Butler County, Crenshaw County, Alabama. It was in force for 3 hr.

The area

The counties it named.

The facts

Issued: Sep 18, 2021, 6:13 PM CDT (23:13 UTC)
Expired: Sep 18, 2021, 9:15 PM CDT
In force: 3 hr
Issued by: NWS Mobile, AL
Area: Storm-based polygon

Counties Butler County, AL, Crenshaw County, AL

The radar

The Ft Rucker radar (KEOX), 103 km from the middle of the area, began a volume at 23:16 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

Birmingham, AL (KBMX), launched 12:00Z, 11.2 hours before the alert went out and 162 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: 1167 J/kg
Mixed-layer CIN: -4 J/kg
Mixed-layer LCL: 453 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: 21 m²/s²
0-3 km storm-relative helicity: 2 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 18, 3:52 PM CDT, 2 hours 21 minutes earlier.

Area forecast discussion, Sep 18, 3:52 PM CDT, 2 hours 21 minutes before

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In the hours before

Special weather statement, Sep 18, 3:15 PM CDT, 2 hours 58 minutes before

Special Weather Statement
National Weather Service Mobile AL
315 PM CDT Sat Sep 18 2021

ALZ053-182045-
Clarke AL-
315 PM CDT Sat Sep 18 2021

...A strong thunderstorm will impact portions of northwestern Clarke
County through 345 PM CDT...

At 314 PM CDT, Doppler radar was tracking a strong thunderstorm over
Coffeeville, or 17 miles west of Grove Hill, moving northeast at 25
mph.

HAZARD...Winds up to around 40 mph.

SOURCE...Radar indicated.

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

Locations impacted include...
Coffeeville.

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.

&&

LAT...LON 3177 8777 3165 8809 3166 8808 3168 8808
      3169 8809 3174 8809 3176 8811 3176 8813
      3175 8814 3176 8815 3193 8801
TIME...MOT...LOC 2014Z 229DEG 20KT 3173 8807

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...40 MPH

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 17, 9:13 PM CDT	Areal Flood Advisory	MOB	Baldwin, Escambia	3 hr
Sep 18, 7:54 AM CDT	Areal Flood Advisory	MOB	Baldwin	3 hr
Sep 18, 10:46 AM CDT	Areal Flood Advisory	MOB	Clarke	3 hr
Sep 18, 11:20 AM CDT	Areal Flood Advisory	MOB	Baldwin	3 hr
Sep 18, 11:25 AM CDT	Areal Flood Advisory	MOB	Conecuh, Escambia	3 hr
Sep 18, 1:25 PM CDT	Areal Flood Advisory	MOB	Conecuh, Escambia	3 hr
Sep 18, 2:02 PM CDT	Areal Flood Advisory	MOB	Washington	3 hr
Sep 18, 2:28 PM CDT	Areal Flood Advisory	MOB	Clarke, Monroe, Washington	6 hr
Sep 18, 3:15 PM CDT	Special Weather Statement	MOB	Clarke	30 min
Sep 18, 4:15 PM CDT	Areal Flood Advisory	MOB	Choctaw	3 hr
Sep 18, 4:23 PM CDT	Areal Flood Advisory	MOB	Crenshaw	3 hr
Sep 18, 5:00 PM CDT	Areal Flood Advisory	MOB	Washington	3 hr
Sep 18, 5:47 PM CDT	Areal Flood Advisory	MOB	Wilcox	3 hr
Sep 18, 6:37 PM CDT	Areal Flood Advisory	MOB	Covington	3 hr
Sep 18, 3:04 PM CDT	Areal Flood Advisory	MOB	Greene, Perry, Wayne	4 hr
Sep 18, 4:01 PM CDT	Flash Flood Warning	MOB	Greene, Perry	6 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.