Alert archive / Alabama / Areal Flood Warnings in 2018

Areal Flood Warning 13, NWS Birmingham, AL

September 26, 2018Jefferson County, Alabama

NWS Birmingham, AL issued this areal flood warning at Sep 26, 2018, 3:46 PM CDT for Jefferson County, Alabama. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Sep 26, 2018, 3:46 PM CDT (20:46 UTC)
Expired: Sep 26, 2018, 6:45 PM CDT
In force: 3 hr
Issued by: NWS Birmingham, AL
Area: Storm-based polygon
Flood severity: None

County Jefferson County, AL

The radar

The Birmingham radar (KBMX), 44 km from the middle of the area, began a volume at 20:49 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, 8.8 hours before the alert went out and 43 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: 552 J/kg
Mixed-layer CIN: -6 J/kg
Mixed-layer LCL: 605 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: -13 m²/s²
0-3 km storm-relative helicity: -9 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 warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Birmingham, AL wrote its last area forecast discussion before this areal flood warning went out at Sep 26, 3:42 PM CDT, 4 minutes earlier.

Area forecast discussion, Sep 26, 3:42 PM CDT, 4 minutes before

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Hazardous weather outlook, Sep 26, 3:30 PM CDT, 16 minutes before

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In the hours before

Local storm report, Sep 26, 12:09 PM CDT, 3 hours 37 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BIRMINGHAM AL
1209 PM CDT WED SEP 26 2018

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1135 AM     TSTM WND DMG     2 SSE HUEYTOWN          33.42N 86.99W
09/26/2018                   JEFFERSON          AL   TRAINED SPOTTER

            CORRECTS PREVIOUS FLASH FLOOD REPORT FROM 2
            SSE HUEYTOWN. TREE ON HOUSE OFF OF EDGEHILL
            DR IN HUEYTOWN, NO INJURIES.

&&

MW

Local storm report, Sep 26, 12:15 PM CDT, 3 hours 31 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BIRMINGHAM AL
1215 PM CDT WED SEP 26 2018

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1210 PM     FLASH FLOOD      1 SE BRIGHTON           33.43N 86.94W
09/26/2018                   JEFFERSON          AL   BROADCAST MEDIA

            SIGNIFICANT FLOODING REPORTED AT A MOBILE
            HOME PARK ALONG BESSEMER SUPER HIGHWAY.

&&

MW

Local storm report, Sep 26, 12:23 PM CDT, 3 hours 23 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BIRMINGHAM AL
1223 PM CDT WED SEP 26 2018

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1218 PM     FLASH FLOOD      2 NNW BESSEMER          33.42N 86.98W
09/26/2018                   JEFFERSON          AL   TRAINED SPOTTER

            FLOODING AT THE INTERSECTION OF MISSISSIPPI
            AVE AND 21ST ST NEAR HUEYTOWN.

&&

MW

Local storm report, Sep 26, 12:42 PM CDT, 3 hours 4 minutes before

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Local storm report, Sep 26, 1:40 PM CDT, 2 hours 6 minutes before

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Local storm report, Sep 26, 1:56 PM CDT, 1 hour 50 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 25, 7:27 PM CDT	Special Weather Statement	BMX	Blount	33 min
Sep 26, 6:58 AM CDT	Flash Flood Watch	BMX	Bibb, Blount, Calhoun, Cherokee, Etowah, Fayette and 9 more	35 hr
Sep 26, 7:13 AM CDT	Areal Flood Advisory	BMX	Fayette, Lamar, Marion, Walker, Winston	3 hr
Sep 26, 7:26 AM CDT	Areal Flood Advisory	BMX	Marion	3 hr
Sep 26, 10:12 AM CDT	Areal Flood Advisory	BMX	Jefferson	2 hr
Sep 26, 10:41 AM CDT	Flash Flood Warning	BMX	Jefferson	5 hr
Sep 26, 11:34 AM CDT	Areal Flood Advisory	BMX	Tuscaloosa	3 hr
Sep 26, 11:51 AM CDT	Areal Flood Advisory	BMX	Bibb, Shelby	3 hr
Sep 26, 12:36 PM CDT	River Flood Warning	BMX	Jefferson	110 min
Sep 26, 3:45 PM CDT	Areal Flood Advisory	BMX	Chambers, Lee	2 hr
Sep 26, 3:51 PM CDT	Special Weather Statement	BMX	Macon	24 min
Sep 26, 3:55 PM CDT	Special Weather Statement	BMX	Bullock	35 min
Sep 26, 4:40 PM CDT	Areal Flood Advisory	BMX	Bullock, Macon, Montgomery, Pike	2 hr
Sep 26, 5:08 PM CDT	Areal Flood Advisory	BMX	Chambers, Lee	2 hr

Nearby

Areal Flood Warnings in Alabama, 2018 Every areal flood warning in 2018

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.