Alert archive / Alabama / Flash Flood Watches in 2021
Flash Flood Watch 4, NWS Birmingham, AL
NWS Birmingham, AL issued this flash flood watch at Jul 20, 2021, 8:42 AM CDT for 14 counties in Alabama. It was in force for 12 hr.
The area
The counties it named.
The facts
- Issued
- Jul 20, 2021, 8:42 AM CDT (13:42 UTC)
- Expired
- Jul 20, 2021, 8:36 PM CDT
- In force
- 12 hr
- Issued by
- NWS Birmingham, AL
- Flood severity
- None
Counties Bibb County, AL, Blount County, AL, Calhoun County, AL, Cherokee County, AL, Clay County, AL, Cleburne County, AL, Etowah County, AL, Jefferson County, AL, Randolph County, AL, Shelby County, AL, St. Clair County, AL, Talladega County, AL, Tuscaloosa County, AL, Walker County, AL
The radar
The Birmingham radar (KBMX), 61 km from the middle of the area, began a volume at 13:43 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, 1.7 hours before the alert went out and 61 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
- 690 J/kg
- Mixed-layer CIN
- -3 J/kg
- Mixed-layer LCL
- 524 m above ground
- 0-6 km bulk shear
- 18 kt
- 0-1 km storm-relative helicity
- 28 m²/s²
- 0-3 km storm-relative helicity
- 57 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
349 WGUS64 KBMX 201342 FFABMX URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service Birmingham AL 842 AM CDT Tue Jul 20 2021 ALZ015-017>021-023>029-034-210300- /O.NEW.KBMX.FF.A.0004.210720T1342Z-210721T0300Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Walker-Blount-Etowah-Calhoun-Cherokee-Cleburne-Tuscaloosa-Jefferson- Shelby-St. Clair-Talladega-Clay-Randolph-Bibb- Including the cities of Roanoke, Hoover, Centre, Centreville, Alabaster, Gadsden, Oneonta, Talladega, Tuscaloosa, Sylacauga, Heflin, Jasper, Pell City, Ashland, Birmingham, Moody, Anniston, Pelham, and Columbiana 842 AM CDT Tue Jul 20 2021 ...FLASH FLOOD WATCH IN EFFECT THROUGH THIS EVENING... The National Weather Service in Birmingham has issued a * Flash Flood Watch for portions of central Alabama, east central Alabama, northeast Alabama and west central Alabama, including the following areas, in central Alabama, Bibb, Blount, Jefferson, Shelby, St. Clair, Talladega and Walker. In east central Alabama, Calhoun, Clay, Cleburne and Randolph. In northeast Alabama, Cherokee and Etowah. In west central Alabama, Tuscaloosa. * Through this evening. * Expected heavy rainfall across the watch area may result in localized flash flooding, especially in urban, low-lying and poor drainage areas. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ 05
1 follow-up statement
781 WGUS64 KBMX 210136 FFABMX Flood Watch National Weather Service Birmingham AL 836 PM CDT Tue Jul 20 2021 ALZ015-017>021-023>029-034-210245- /O.CAN.KBMX.FF.A.0004.000000T0000Z-210721T0300Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Walker-Blount-Etowah-Calhoun-Cherokee-Cleburne-Tuscaloosa-Jefferson- Shelby-St. Clair-Talladega-Clay-Randolph-Bibb- Including the cities of Roanoke, Hoover, Centre, Centreville, Alabaster, Gadsden, Oneonta, Talladega, Tuscaloosa, Sylacauga, Heflin, Jasper, Pell City, Ashland, Birmingham, Moody, Anniston, Pelham, and Columbiana 836 PM CDT Tue Jul 20 2021 ...FLASH FLOOD WATCH IS CANCELLED... The Flash Flood Watch for portions of central Alabama, east central Alabama, northeast Alabama and west central Alabama, including the following areas, in central Alabama, Bibb, Blount, Jefferson, Shelby, St. Clair, Talladega and Walker. In east central Alabama, Calhoun, Clay, Cleburne and Randolph. In northeast Alabama, Cherokee and Etowah. In west central Alabama, Tuscaloosa has been cancelled. The Flood Watch is cancelled. No additional heavy rainfall is expected this evening and flooding is no longer expected to pose a threat. $$
The office that day
Everything else NWS Birmingham, AL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 19, 7:00 PM CDT | Areal Flood Advisory | BMX | St. Clair | 3 hr |
| Jul 19, 7:01 PM CDT | Areal Flood Advisory | BMX | Tuscaloosa | 3 hr |
| Jul 19, 7:02 PM CDT | Areal Flood Advisory | BMX | Fayette | 118 min |
| Jul 19, 7:34 PM CDT | Areal Flood Advisory | BMX | Greene | 116 min |
| Jul 19, 7:53 PM CDT | Areal Flood Advisory | BMX | Walker | 2 hr |
| Jul 19, 8:19 PM CDT | Areal Flood Advisory | BMX | Jefferson | 3 hr |
| Jul 20, 2:05 AM CDT | Areal Flood Advisory | BMX | Jefferson | 3 hr |
| Jul 20, 12:14 PM CDT | Special Weather Statement | BMX | Pike | 46 min |
| Jul 20, 1:10 PM CDT | Special Weather Statement | BMX | Autauga, Lowndes, Montgomery | 50 min |
| Jul 20, 2:04 PM CDT | Special Weather Statement | BMX | Autauga, Elmore, Macon | 41 min |
| Jul 20, 2:29 PM CDT | Areal Flood Advisory | BMX | Bibb, Jefferson, Shelby, Tuscaloosa | 3 hr |
| Jul 20, 2:41 PM CDT | Areal Flood Advisory | BMX | Bibb, Chilton, Perry | 3 hr |
| Jul 20, 2:48 PM CDT | Areal Flood Advisory | BMX | Jefferson, Shelby | 3 hr |
| Jul 20, 3:34 PM CDT | Areal Flood Advisory | BMX | Shelby | 3 hr |
| Jul 20, 3:41 PM CDT | Flash Flood Warning | BMX | Shelby | 3 hr |
| Jul 20, 3:44 PM CDT | Areal Flood Advisory | BMX | Marion | 2 hr |
| Jul 20, 4:00 PM CDT | Areal Flood Advisory | BMX | St. Clair, Shelby | 3 hr |
| Jul 20, 4:06 PM CDT | Areal Flood Advisory | BMX | Walker, Winston | 114 min |
| Jul 20, 4:22 PM CDT | Areal Flood Advisory | BMX | St. Clair | 3 hr |
| Jul 20, 5:56 PM CDT | Areal Flood Advisory | BMX | Marion, Walker, Winston | 2 hr |
| Jul 20, 6:03 PM CDT | Areal Flood Advisory | BMX | Blount | 117 min |
Nearby
Flash Flood Watches in Alabama, 2021Every flash flood watch in 2021
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.