Alert archive / Georgia / Wind Chill Advisories in 2020

Wind Chill Advisory 2, NWS Jacksonville, FL

January 21, 202010 counties in Florida; 14 counties in Georgia

NWS Jacksonville, FL issued this wind chill advisory at Jan 21, 2020, 8:55 AM EST for 10 counties in Florida; 14 counties in Georgia. It took effect at Jan 22, 2020, 12:00 AM EST. It was in force for 8 hr.

The area

The counties it named.

The facts

Issued: Jan 21, 2020, 8:55 AM EST (13:55 UTC)
In effect from: Jan 22, 2020, 12:00 AM EST
Expired: Jan 22, 2020, 8:22 AM EST
In force: 8 hr
Issued by: NWS Jacksonville, FL

All 24 counties

Alachua County, FL, Baker County, FL, Bradford County, FL, Duval County, FL, Flagler County, FL, Gilchrist County, FL, Marion County, FL, Nassau County, FL, Suwannee County, FL, Union County, FL, Appling County, GA, Atkinson County, GA, Bacon County, GA, Brantley County, GA, Camden County, GA, Charlton County, GA, Clinch County, GA, Coffee County, GA, Echols County, GA, Glynn County, GA, Jeff Davis County, GA, Pierce County, GA, Ware County, GA, Wayne County, GA

The radar

The Jacksonville radar (KJAX), 59 km from the middle of the area, began a volume at 13:52 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

Cape Canaveral, FL (KXMR), launched 12:00Z, 1.9 hours before the alert went out and 302 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: 749 m above ground
0-6 km bulk shear: 64 kt
0-1 km storm-relative helicity: 76 m²/s²
0-3 km storm-relative helicity: 171 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 Jacksonville, FL wrote its last area forecast discussion before this wind chill advisory went out at Jan 21, 5:29 AM EST, 3 hours 26 minutes earlier.

Area forecast discussion, Jan 21, 5:29 AM EST, 3 hours 26 minutes before

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The office that day

Everything else NWS Jacksonville, FL issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jan 21, 3:44 AM EST	Freeze Watch	JAX	Alachua, Baker, Bradford, Gilchrist, Marion, Nassau and 2 more	5 hr
Jan 21, 3:47 AM EST	Gale Warning	JAX		41 hr
Jan 21, 8:42 AM EST	Coastal Flood Statement	JAX	Duval, Flagler, Nassau	65 hr
Jan 21, 8:42 AM EST	High Surf Advisory	JAX	Duval, Flagler, Nassau	65 hr
Jan 21, 8:56 AM EST	Freeze Warning	JAX	Alachua, Baker, Bradford, Flagler, Gilchrist, Marion and 3 more	23 hr
Jan 21, 1:57 PM EST	Hard Freeze Warning	JAX	Alachua, Baker, Bradford, Gilchrist, Marion, Nassau and 2 more	18 hr

Nearby

Wind Chill Advisories in Georgia, 2020 Wind Chill Advisories in Florida, 2020 Every wind chill advisory 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.