Alert archive / Alabama / Flash Flood Watches in 2009
Flash Flood Watch 1, NWS Birmingham, AL
NWS Birmingham, AL issued this flash flood watch at Jan 5, 2009, 3:47 PM CST for 13 counties in Alabama. It took effect at Jan 5, 2009, 9:00 PM CST. It was in force for 21 hr.
The area
The counties it named.
The facts
- Issued
- Jan 5, 2009, 3:47 PM CST (21:47 UTC)
- In effect from
- Jan 5, 2009, 9:00 PM CST
- Expired
- Jan 6, 2009, 6:00 PM CST
- In force
- 21 hr
- Issued by
- NWS Birmingham, AL
- Flood severity
- None
Counties Blount County, AL, Calhoun County, AL, Cherokee County, AL, Etowah County, AL, Fayette County, AL, Jefferson County, AL, Lamar County, AL, Marion County, AL, Pickens County, AL, St. Clair County, AL, Tuscaloosa County, AL, Walker County, AL, Winston County, AL
The radar
The Birmingham radar (KBMX), 74 km from the middle of the area, began a volume at 21:50 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, 9.8 hours before the alert went out and 72 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
- 121 J/kg
- Mixed-layer CIN
- -7 J/kg
- Mixed-layer LCL
- 441 m above ground
- 0-6 km bulk shear
- 32 kt
- 0-1 km storm-relative helicity
- 48 m²/s²
- 0-3 km storm-relative helicity
- 74 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 Jan 5, 3:24 PM CST, 23 minutes earlier.
Area forecast discussion, Jan 5, 3:24 PM CST, 23 minutes before
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</html>Hazardous weather outlook, Jan 5, 12:34 PM CST, 3 hours 13 minutes before
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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; radar from the NEXRAD Level II archive.