Alert archive / Alabama / Wind Chill Advisories in 2022

Wind Chill Advisory 1, NWS Birmingham, AL

December 21, 202239 counties in Alabama

NWS Birmingham, AL issued this wind chill advisory at Dec 21, 2022, 2:09 PM CST for 39 counties in Alabama. It took effect at Dec 23, 2022, 12:00 AM CST. It was in force for 36 hr.

The area

The counties it named.

The facts

Issued: Dec 21, 2022, 2:09 PM CST (20:09 UTC)
In effect from: Dec 23, 2022, 12:00 AM CST
Expired: Dec 24, 2022, 12:00 PM CST
In force: 36 hr
Issued by: NWS Birmingham, AL

All 39 counties

Autauga County, AL, Barbour County, AL, Bibb County, AL, Blount County, AL, Bullock County, AL, Calhoun County, AL, Chambers County, AL, Cherokee County, AL, Chilton County, AL, Clay County, AL, Cleburne County, AL, Coosa County, AL, Dallas County, AL, Elmore County, AL, Etowah 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, Marion 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, Winston County, AL

The radar

The Birmingham radar (KBMX), 22 km from the middle of the area, began a volume at 20:12 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

Peachtre/Fal Fld, GA (KFFC), launched 12:00Z, 8.2 hours before the alert went out and 198 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 631 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 2 m²/s²
0-3 km storm-relative helicity: 143 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this wind chill advisory 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 wind chill advisory went out at Dec 21, 1:17 PM CST, 52 minutes earlier.

Area forecast discussion, Dec 21, 1:17 PM CST, 52 minutes before

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Hazardous weather outlook, Dec 21, 4:02 AM CST, 10 hours 7 minutes before

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The office that day

Everything else NWS Birmingham, AL issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Dec 21, 2:53 AM CST	Wind Chill Warning	BMX	Blount, Cherokee, Etowah, Fayette, Jefferson, Lamar and 4 more	57 hr
Dec 21, 2:58 AM CST	Hard Freeze Warning	BMX	Autauga, Barbour, Bibb, Blount, Bullock, Calhoun and 33 more	5 days

Nearby

Wind Chill Advisories in Alabama, 2022 Every wind chill advisory in 2022

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.