Alert archive / Alabama / Flash Flood Watches in 2020
Flash Flood Watch 9, NWS Birmingham, AL
NWS Birmingham, AL issued this flash flood watch at Apr 18, 2020, 3:50 AM CDT for 34 counties in Alabama. It took effect at Apr 19, 2020, 7:00 AM CDT. It was in force for 21 hr.
The area
The counties it named.
The facts
- Issued
- Apr 18, 2020, 3:50 AM CDT (08:50 UTC)
- In effect from
- Apr 19, 2020, 7:00 AM CDT
- Expired
- Apr 20, 2020, 4:00 AM CDT
- In force
- 21 hr
- Issued by
- NWS Birmingham, AL
- Flood severity
- None
All 34 counties
Autauga County, AL, Barbour County, AL, Bibb County, AL, Bullock County, AL, Calhoun County, AL, Chambers County, AL, Chilton County, AL, Clay County, AL, Cleburne County, AL, Coosa County, AL, Dallas County, AL, Elmore 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, 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
The radar
The Birmingham radar (KBMX), 36 km from the middle of the area, began a volume at 08:50 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 00:00Z, 8.8 hours before the alert went out and 37 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1979 m above ground
- 0-6 km bulk shear
- 48 kt
- 0-1 km storm-relative helicity
- 51 m²/s²
- 0-3 km storm-relative helicity
- 243 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 Apr 18, 12:51 AM CDT, 2 hours 59 minutes earlier.
Area forecast discussion, Apr 18, 12:51 AM CDT, 2 hours 59 minutes before
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</html>Hazardous weather outlook, Apr 17, 4:18 AM CDT, 23 hours 32 minutes before
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Local storm report, Apr 17, 10:03 PM CDT, 5 hours 47 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 |
|---|---|---|---|---|
| Apr 18, 8:26 AM CDT | River Flood Warning | BMX | Bibb, Dallas, Perry | 3 days |
| Apr 18, 8:26 AM CDT | River Flood Warning | BMX | Dallas, Perry | 6 days |
| Apr 18, 9:12 AM CDT | River Flood Warning | BMX | Sumter | 7 days |
Nearby
Flash Flood Watches in Alabama, 2020Every flash flood watch in 2020
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.