Alert archive / Alabama / Flash Flood Watches in 2009

Flash Flood Watch 14, NWS Birmingham, AL

August 16, 200922 counties in Alabama

NWS Birmingham, AL issued this flash flood watch at Aug 16, 2009, 7:17 PM CDT for 22 counties in Alabama. It took effect at Aug 17, 2009, 4:00 AM CDT. It was in force for 12 hr.

The area

The counties it named.

The facts

Issued: Aug 16, 2009, 7:17 PM CDT (00:17 UTC)
In effect from: Aug 17, 2009, 4:00 AM CDT
Expired: Aug 17, 2009, 4:00 PM CDT
In force: 12 hr
Issued by: NWS Birmingham, AL
Flood severity: None

All 22 counties

Autauga County, AL, Barbour 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, Pike County, AL, Randolph County, AL, Russell County, AL, Sumter County, AL, Tallapoosa County, AL

The nearest sounding before it

Birmingham, AL (KBMX), launched 00:00Z, 0.3 hours before the alert went out and 79 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: 1524 J/kg
Mixed-layer CIN: -4 J/kg
Mixed-layer LCL: 1247 m above ground
0-6 km bulk shear: 7 kt
0-1 km storm-relative helicity: -2 m²/s²
0-3 km storm-relative helicity: 6 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 Aug 16, 6:50 PM CDT, 27 minutes earlier.

Area forecast discussion, Aug 16, 6:50 PM CDT, 27 minutes before

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Hazardous weather outlook, Aug 16, 2:25 PM CDT, 4 hours 52 minutes before

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In the hours before

Special weather statement, Aug 16, 6:55 PM CDT, 22 minutes before

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Special weather statement, Aug 16, 7:10 PM CDT, 7 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
Aug 16, 7:40 PM CDT	Lake Wind Advisory	BMX	Autauga, Barbour, Bullock, Chilton, Elmore, Fayette and 9 more	17 hr
Aug 16, 7:40 PM CDT	Wind Advisory	BMX	Bibb, Dallas, Greene, Hale, Lowndes, Marengo and 4 more	17 hr
Aug 17, 8:53 AM CDT	Areal Flood Advisory	BMX	Lee, Russell	112 min
Aug 17, 9:24 AM CDT	Flash Flood Warning	BMX	Lee, Russell	2 hr
Aug 17, 10:05 AM CDT	Areal Flood Advisory	BMX	Chambers	3 hr

Nearby

Flash Flood Watches in Alabama, 2009 Every flash flood watch in 2009

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.