Alert archive / Alabama / Flash Flood Watches in 2020

Flash Flood Watch 3, NWS Birmingham, AL

February 10, 202022 counties in Alabama

NWS Birmingham, AL issued this flash flood watch at Feb 10, 2020, 3:40 AM CST for 22 counties in Alabama. It took effect at Feb 10, 2020, 6:00 AM CST. It was in force for 28 hr.

The area

The counties it named.

The facts

Issued: Feb 10, 2020, 3:40 AM CST (09:40 UTC)
In effect from: Feb 10, 2020, 6:00 AM CST
Expired: Feb 11, 2020, 9:36 AM CST
In force: 28 hr
Issued by: NWS Birmingham, AL

All 22 counties

Bibb County, AL, Blount County, AL, Calhoun County, AL, Cherokee County, AL, Clay County, AL, Cleburne County, AL, Etowah County, AL, Fayette County, AL, Greene County, AL, Hale County, AL, Jefferson County, AL, Lamar County, AL, Marion County, AL, Pickens County, AL, Randolph County, AL, Shelby County, AL, St. Clair County, AL, Sumter County, AL, Talladega County, AL, Tuscaloosa County, AL, Walker County, AL, Winston County, AL

The radar

The Birmingham radar (KBMX), 41 km from the middle of the area, began a volume at 09:43 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

Nashville Metro, TN (KBNA), launched 00:00Z, 9.7 hours before the alert went out and 291 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1544 m above ground
0-6 km bulk shear: 53 kt
0-1 km storm-relative helicity: 462 m²/s²
0-3 km storm-relative helicity: 529 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 flash flood watch 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 flash flood watch went out at Feb 9, 11:55 PM CST, 3 hours 45 minutes earlier.

Area forecast discussion, Feb 9, 11:55 PM CST, 3 hours 45 minutes before

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Hazardous weather outlook, Feb 9, 6:52 PM CST, 8 hours 48 minutes before

Hazardous Weather Outlook
National Weather Service Birmingham AL
652 PM CST Sun Feb 9 2020

ALZ011>015-017>050-110400-
Marion-Lamar-Fayette-Winston-Walker-Blount-Etowah-Calhoun-Cherokee-
Cleburne-Pickens-Tuscaloosa-Jefferson-Shelby-St. Clair-Talladega-
Clay-Randolph-Sumter-Greene-Hale-Perry-Bibb-Chilton-Coosa-Tallapoosa-
Chambers-Marengo-Dallas-Autauga-Lowndes-Elmore-Montgomery-Macon-
Bullock-Lee-Russell-Pike-Barbour-
652 PM CST Sun Feb 9 2020

This Hazardous Weather Outlook is for the counties served by the
National Weather Service office in Birmingham.

.DAY ONE...Outlook through Tonight.

Many area rivers are in or expected to rise above flood stage.
Please see the latest river statements for specific details on the
rises and expected crest values.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

Many rivers will continue to rise over the next few days. Many have
reached flood stage or will reach flood stage. Please see the latest
river statements for specific details on the rises and expected
crest values.

Periods of heavy rainfall are expected Monday through Thursday.
Recent heavy rainfall has produced saturated soil conditions, and
any additional rainfall could produce flash flooding issues.

There is a potential for severe storms Wednesday night into early
Thursday morning. Damaging winds and a couple of tornadoes appear
possible.

.SPOTTER INFORMATION STATEMENT...

Activation of storm spotters and emergency management may be
necessary Monday and Wednesday night.

The office that day

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

Issued	Product	Office	Counties	Lasted
Feb 9, 8:24 PM CST	River Flood Warning	BMX	Bibb, Dallas, Perry	4 days
Feb 9, 8:24 PM CST	River Flood Warning	BMX	Dallas, Perry	7 days
Feb 10, 10:05 AM CST	Areal Flood Advisory	BMX	Greene, Hale, Pickens, Sumter, Tuscaloosa	6 hr
Feb 10, 10:13 AM CST	Areal Flood Advisory	BMX	Fayette, Lamar, Marion, Walker, Winston	6 hr
Feb 10, 11:33 AM CST	Areal Flood Advisory	BMX	Bibb, Jefferson, Shelby	6 hr
Feb 10, 11:53 AM CST	Flash Flood Warning	BMX	Lamar, Marion, Winston	6 hr
Feb 10, 12:18 PM CST	Flash Flood Warning	BMX	Greene, Pickens, Sumter, Tuscaloosa	6 hr
Feb 10, 12:32 PM CST	Flash Flood Warning	BMX	Bibb, Jefferson, Shelby	6 hr
Feb 10, 1:08 PM CST	Areal Flood Warning	BMX	Cherokee	72 hr
Feb 10, 1:09 PM CST	Areal Flood Warning	BMX	Cherokee	5 days
Feb 10, 1:23 PM CST	Areal Flood Warning	BMX	Cherokee	24 hr
Feb 10, 1:50 PM CST	River Flood Warning	BMX	Jefferson	14 hr
Feb 10, 1:51 PM CST	Areal Flood Advisory	BMX	Blount, Calhoun, Etowah, St. Clair, Talladega	6 hr
Feb 10, 2:30 PM CST	Flash Flood Warning	BMX	Blount, Calhoun, Cherokee, Etowah, St. Clair, Talladega	6 hr
Feb 10, 2:49 PM CST	Flash Flood Warning	BMX	Bibb, Chilton, Hale, Perry	6 hr
Feb 10, 3:03 PM CST	Areal Flood Advisory	BMX	Chambers, Clay, Randolph	5 hr
Feb 10, 3:39 PM CST	Areal Flood Advisory	BMX	Coosa	4 hr
Feb 10, 3:49 PM CST	Areal Flood Advisory	BMX	Cleburne, Talladega	5 hr
Feb 10, 4:45 PM CST	Areal Flood Advisory	BMX	Fayette, Lamar, Walker	4 hr

Nearby

Flash Flood Watches in Alabama, 2020 Every flash flood watch in 2020

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.