Alert archive / Alabama / Flash Flood Watches in 2009

Flash Flood Watch 5, NWS Birmingham, AL

March 27, 200921 counties in Alabama

NWS Birmingham, AL issued this flash flood watch at Mar 27, 2009, 2:41 PM CDT for 21 counties in Alabama. It took effect at Mar 28, 2009, 12:00 AM CDT. It was in force for 8 hr.

The area

The counties it named.

The facts

Issued: Mar 27, 2009, 2:41 PM CDT (19:41 UTC)
In effect from: Mar 28, 2009, 12:00 AM CDT
Expired: Mar 28, 2009, 7:46 AM CDT
In force: 8 hr
Issued by: NWS Birmingham, AL
Flood severity: None

All 21 counties

Autauga County, AL, Barbour County, AL, Bibb County, AL, Bullock County, AL, Chambers County, AL, Chilton 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, Russell County, AL, Sumter County, AL, Tallapoosa County, AL

The nearest sounding before it

Peachtre/Fal Fld, GA (KFFC), launched 12:00Z, 7.7 hours before the alert went out and 209 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: 56 J/kg
Mixed-layer CIN: -32 J/kg
Mixed-layer LCL: 487 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 97 m²/s²
0-3 km storm-relative helicity: 212 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 Mar 27, 12:48 PM CDT, 1 hour 53 minutes earlier.

Area forecast discussion, Mar 27, 12:48 PM CDT, 1 hour 53 minutes before

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Hazardous weather outlook, Mar 27, 1:12 PM CDT, 1 hour 29 minutes before

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In the hours before

Local storm report, Mar 27, 9:16 AM CDT, 5 hours 25 minutes before

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Local storm report, Mar 27, 11:15 AM CDT, 3 hours 26 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
Mar 26, 10:36 PM CDT	Areal Flood Advisory	BMX	Marengo	4 hr
Mar 26, 11:41 PM CDT	Areal Flood Advisory	BMX	Autauga, Dallas, Lowndes, Perry	4 hr
Mar 27, 1:51 AM CDT	Flash Flood Watch	BMX	Autauga, Barbour, Bibb, Bullock, Chambers, Chilton and 16 more	9 hr
Mar 27, 2:42 AM CDT	Areal Flood Advisory	BMX	Marengo	3 hr
Mar 27, 3:51 AM CDT	Areal Flood Advisory	BMX	Autauga, Dallas, Greene, Hale, Lowndes, Marengo and 2 more	3 hr
Mar 27, 6:37 AM CDT	Severe Thunderstorm Warning	BMX	Montgomery, Pike	38 min
Mar 27, 6:58 AM CDT	Severe Thunderstorm Warning	BMX	Barbour, Pike	32 min
Mar 27, 7:24 AM CDT	Severe Thunderstorm Warning	BMX	Barbour	20 min
Mar 27, 7:31 AM CDT	Areal Flood Warning	BMX	Autauga, Dallas, Greene, Hale, Lowndes, Marengo and 1 more	4 hr
Mar 27, 7:43 AM CDT	Areal Flood Advisory	BMX	Barbour, Bibb, Bullock, Chambers, Chilton, Coosa and 8 more	3 hr
Mar 27, 8:13 AM CDT	River Flood Warning	BMX	Montgomery	3 days

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.