Alert archive / Alabama / Frost Advisories in 2021
Frost Advisory 2, NWS Birmingham, AL
NWS Birmingham, AL issued this frost advisory at Apr 21, 2021, 3:09 AM CDT for 23 counties in Alabama. It took effect at Apr 21, 2021, 11:00 PM CDT. It was in force for 9 hr.
The area
The counties it named.
The facts
- Issued
- Apr 21, 2021, 3:09 AM CDT (08:09 UTC)
- In effect from
- Apr 21, 2021, 11:00 PM CDT
- Expired
- Apr 22, 2021, 8:00 AM CDT
- In force
- 9 hr
- Issued by
- NWS Birmingham, AL
All 23 counties
Bibb County, AL, Blount County, AL, Calhoun County, AL, Chambers County, AL, Cherokee County, AL, Chilton County, AL, Clay County, AL, Cleburne County, AL, Coosa County, AL, Etowah County, AL, Fayette County, AL, Jefferson County, AL, Lamar County, AL, Marion County, AL, Pickens County, AL, Randolph County, AL, Shelby County, AL, St. Clair County, AL, Talladega County, AL, Tallapoosa County, AL, Tuscaloosa County, AL, Walker County, AL, Winston County, AL
The radar
The Birmingham radar (KBMX), 41 km from the middle of the area, began a volume at 08:09 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, 8.2 hours before the alert went out and 40 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
- 2626 m above ground
- 0-6 km bulk shear
- 48 kt
- 0-1 km storm-relative helicity
- 27 m²/s²
- 0-3 km storm-relative helicity
- 69 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
586 WWUS74 KBMX 210809 NPWBMX URGENT - WEATHER MESSAGE National Weather Service Birmingham AL 309 AM CDT Wed Apr 21 2021 ALZ011>015-017>029-212200- /O.NEW.KBMX.FR.Y.0002.210422T0600Z-210422T1300Z/ Marion-Lamar-Fayette-Winston-Walker-Blount-Etowah-Calhoun- Cherokee-Cleburne-Pickens-Tuscaloosa-Jefferson-Shelby-St. Clair- Talladega-Clay-Randolph- Including the cities of Hamilton, Sulligent, Vernon, Fayette, Double Springs, Jasper, Oneonta, Gadsden, Anniston, Centre, Heflin, Carrollton, Tuscaloosa, Birmingham, Hoover, Columbiana, Pelham, Alabaster, Pell City, Moody, Talladega, Sylacauga, Ashland, and Roanoke 309 AM CDT Wed Apr 21 2021 ...FROST ADVISORY IN EFFECT FROM 1 AM TO 8 AM CDT THURSDAY... * WHAT...Temperatures between 33 and 36 degrees will result in frost formation. * WHERE...Northern portions of Central Alabama. * WHEN...From 1 AM to 8 AM CDT Thursday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$
2 follow-up statements
241 WWUS74 KBMX 211845 NPWBMX URGENT - WEATHER MESSAGE National Weather Service Birmingham AL 145 PM CDT Wed Apr 21 2021 ALZ011>015-017>029-221300- /O.CON.KBMX.FR.Y.0002.210422T0600Z-210422T1300Z/ Marion-Lamar-Fayette-Winston-Walker-Blount-Etowah-Calhoun- Cherokee-Cleburne-Pickens-Tuscaloosa-Jefferson-Shelby-St. Clair- Talladega-Clay-Randolph- Including the cities of Hamilton, Sulligent, Vernon, Fayette, Double Springs, Jasper, Oneonta, Gadsden, Anniston, Centre, Heflin, Carrollton, Tuscaloosa, Birmingham, Hoover, Columbiana, Pelham, Alabaster, Pell City, Moody, Talladega, Sylacauga, Ashland, and Roanoke 145 PM CDT Wed Apr 21 2021 ...FROST ADVISORY REMAINS IN EFFECT FROM 1 AM TO 8 AM CDT THURSDAY... * WHAT...Temperatures between 33 and 36 degrees will result in frost formation. * WHERE...Northern portions of Central Alabama. * WHEN...From 1 AM to 8 AM CDT Thursday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$
218 WWUS74 KBMX 220328 NPWBMX URGENT - WEATHER MESSAGE National Weather Service Birmingham AL 1028 PM CDT Wed Apr 21 2021 ALZ034>038-221300- /O.EXB.KBMX.FR.Y.0002.210422T0400Z-210422T1300Z/ Bibb-Chilton-Coosa-Tallapoosa-Chambers- Including the cities of Centreville, Clanton, Rockford, Alexander City, Dadeville, Valley, Lanett, and Lafayette 1028 PM CDT Wed Apr 21 2021 ...FROST ADVISORY IN EFFECT UNTIL 8 AM CDT THURSDAY... * WHAT...Temperatures between 33 and 38 degrees will result in frost formation. * WHERE...Bibb, Chilton, Coosa, Tallapoosa and Chambers Counties. * WHEN...Until 8 AM CDT Thursday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. * ADDITIONAL DETAILS...Frost development may not be uniform or widespread, but some places it may be heavy and short lived while some areas have lighter effects. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ ALZ011>015-017>029-221300- /O.EXT.KBMX.FR.Y.0002.210422T0400Z-210422T1300Z/ Marion-Lamar-Fayette-Winston-Walker-Blount-Etowah-Calhoun- Cherokee-Cleburne-Pickens-Tuscaloosa-Jefferson-Shelby-St. Clair- Talladega-Clay-Randolph- Including the cities of Hamilton, Sulligent, Vernon, Fayette, Double Springs, Jasper, Oneonta, Gadsden, Anniston, Centre, Heflin, Carrollton, Tuscaloosa, Birmingham, Hoover, Columbiana, Pelham, Alabaster, Pell City, Moody, Talladega, Sylacauga, Ashland, and Roanoke 1028 PM CDT Wed Apr 21 2021 ...FROST ADVISORY NOW IN EFFECT UNTIL 8 AM CDT THURSDAY... * WHAT...Temperatures mainly between 32 and 37 degrees will result in frost formation. * WHERE...Northern portions of Central Alabama. * WHEN...Until 8 AM CDT Thursday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. * ADDITIONAL DETAILS...Frost development may not be uniform or widespread, but some places it may be heavy and short lived while some areas have lighter effects. There may even be a few locations where a brief freeze occurs. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$
Nearby
Frost Advisories in Alabama, 2021Every frost advisory 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.