Alert archive / Alabama / Flash Flood Watches in 2009

Flash Flood Watch 3, NWS Birmingham, AL

March 25, 200939 counties in Alabama

NWS Birmingham, AL issued this flash flood watch at Mar 25, 2009, 3:22 PM CDT for 39 counties in Alabama. It took effect at Mar 25, 2009, 10:00 PM CDT. It was in force for 11 hr.

The area

The counties it named.

The facts

Issued: Mar 25, 2009, 3:22 PM CDT (20:22 UTC)
In effect from: Mar 25, 2009, 10:00 PM CDT
Expired: Mar 26, 2009, 9:15 AM CDT
In force: 11 hr
Issued by: NWS Birmingham, AL
Flood severity: None

All 39 counties

Autauga County, AL, Barbour County, AL, Bibb County, AL, Blount County, AL, Bullock County, AL, Calhoun County, AL, Chambers County, AL, Cherokee County, AL, Chilton County, AL, Clay County, AL, Cleburne County, AL, Coosa County, AL, Dallas County, AL, Elmore County, AL, Etowah County, AL, Fayette County, AL, Greene County, AL, Hale County, AL, Jefferson County, AL, Lamar County, AL, Lee County, AL, Lowndes County, AL, Macon County, AL, Marengo County, AL, Marion County, AL, Montgomery County, AL, Perry County, AL, Pickens County, AL, Pike County, AL, Randolph County, AL, Russell County, AL, Shelby County, AL, St. Clair County, AL, Sumter County, AL, Talladega County, AL, Tallapoosa County, AL, Tuscaloosa County, AL, Walker County, AL, Winston County, AL

The radar

The Birmingham radar (KBMX), 22 km from the middle of the area, began a volume at 20:22 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, 8.4 hours before the alert went out and 23 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: 653 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 477 m²/s²
0-3 km storm-relative helicity: 633 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 25, 2:57 PM CDT, 25 minutes earlier.

Area forecast discussion, Mar 25, 2:57 PM CDT, 25 minutes before

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Hazardous weather outlook, Mar 25, 12:51 PM CDT, 2 hours 31 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 25, 5:00 AM CDT	Lake Wind Advisory	BMX	Autauga, Barbour, Bibb, Blount, Bullock, Calhoun and 33 more	13 hr
Mar 25, 8:54 AM CDT	River Flood Warning	BMX	Greene, Hale, Marengo, Pickens, Sumter	5 days
Mar 25, 8:54 AM CDT	River Flood Warning	BMX	Greene, Hale, Marengo, Sumter	9 days
Mar 25, 8:58 AM CDT	River Flood Warning	BMX	Greene, Hale, Marengo	8 days
Mar 25, 9:01 AM CDT	River Flood Warning	BMX	Sumter	7 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; radar from the NEXRAD Level II archive.