Alert archive / Alabama / Flash Flood Watches in 2020

Flash Flood Watch 6, NWS Birmingham, AL

February 19, 202020 counties in Alabama

NWS Birmingham, AL issued this flash flood watch at Feb 19, 2020, 8:27 PM CST for 20 counties in Alabama. It took effect at Feb 20, 2020, 12:00 AM CST. It was in force for 18 hr.

The area

The counties it named.

The facts

Issued: Feb 19, 2020, 8:27 PM CST (02:27 UTC)
In effect from: Feb 20, 2020, 12:00 AM CST
Expired: Feb 20, 2020, 6:00 PM CST
In force: 18 hr
Issued by: NWS Birmingham, AL
Flood severity: None

Counties Autauga County, AL, Bullock County, AL, Chambers County, AL, Chilton County, AL, Clay County, AL, Coosa County, AL, Dallas County, AL, Elmore County, AL, Greene County, AL, Hale County, AL, Lee County, AL, Lowndes County, AL, Macon County, AL, Marengo County, AL, Montgomery County, AL, Perry County, AL, Randolph County, AL, Russell County, AL, Sumter County, AL, Tallapoosa County, AL

The radar

The Maxwell AFB radar (KMXX), 63 km from the middle of the area, began a volume at 02:28 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 00:00Z, 2.5 hours before the alert went out and 69 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: 844 m above ground
0-6 km bulk shear: 65 kt
0-1 km storm-relative helicity: 82 m²/s²
0-3 km storm-relative helicity: 182 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 19, 5:58 PM CST, 2 hours 29 minutes earlier.

Area forecast discussion, Feb 19, 5:58 PM CST, 2 hours 29 minutes before

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Hazardous weather outlook, Feb 19, 3:23 AM CST, 17 hours 4 minutes before

Hazardous Weather Outlook
National Weather Service Birmingham AL
323 AM CST Wed Feb 19 2020

ALZ011>015-017>050-201230-
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-
323 AM CST Wed Feb 19 2020

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

.DAY ONE...Outlook through Tonight.

Many river basins across Central Alabama are in flood stage. Please
see the latest river statements for specific details.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

River basins will continue to experience flooding over the next
several days. Please see the latest river statements for specific
details.

.SPOTTER INFORMATION STATEMENT...

Activation of storm spotters and emergency management is not
anticipated at this time.

The office that day

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

Issued	Product	Office	Counties	Lasted
Feb 19, 7:37 PM CST	River Flood Warning	BMX	Montgomery	4 days
Feb 20, 8:43 AM CST	River Flood Warning	BMX	Dallas, Perry	12 hr
Feb 20, 9:10 AM CST	River Flood Warning	BMX	Sumter	24 hr
Feb 20, 10:52 AM CST	Areal Flood Advisory	BMX	Greene, Pickens, Sumter	3 hr
Feb 20, 11:06 AM CST	Areal Flood Advisory	BMX	Fayette, Lamar	3 hr
Feb 20, 12:52 PM CST	Areal Flood Warning	BMX	Cherokee	24 hr
Feb 20, 2:04 PM CST	Areal Flood Advisory	BMX	Bullock, Lowndes, Macon, Montgomery, Pike	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.