Alert archive / Alabama / Flash Flood Watches in 2009
Flash Flood Watch 4, NWS Birmingham, AL
NWS Birmingham, AL issued this flash flood watch at Mar 27, 2009, 1:51 AM CDT for 22 counties in Alabama. It was in force for 9 hr.
The area
The counties it named.
The facts
- Issued
- Mar 27, 2009, 1:51 AM CDT (06:51 UTC)
- Expired
- Mar 27, 2009, 10:31 AM CDT
- In force
- 9 hr
- Issued by
- NWS Birmingham, AL
- Flood severity
- None
All 22 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, Shelby County, AL, Sumter County, AL, Tallapoosa County, AL
The nearest sounding before it
Birmingham, AL (KBMX), launched 00:00Z, 6.9 hours before the alert went out and 76 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.
- Mixed-layer CAPE
- 403 J/kg
- Mixed-layer CIN
- -33 J/kg
- Mixed-layer LCL
- 972 m above ground
- 0-6 km bulk shear
- 54 kt
- 0-1 km storm-relative helicity
- 24 m²/s²
- 0-3 km storm-relative helicity
- 56 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.3
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, 12:40 AM CDT, 1 hour 11 minutes earlier.
Area forecast discussion, Mar 27, 12:40 AM CDT, 1 hour 11 minutes before
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</html>Hazardous weather outlook, Mar 26, 10:57 PM CDT, 2 hours 54 minutes before
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Local storm report, Mar 26, 8:48 PM CDT, 5 hours 3 minutes before
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</html>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, 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 |
| Mar 27, 2:41 PM CDT | Flash Flood Watch | BMX | Autauga, Barbour, Bibb, Bullock, Chambers, Chilton and 15 more | 17 hr |
Nearby
Flash Flood Watches in Alabama, 2009Every 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.