Alert archive / Georgia / Wind Chill Advisories in 2018

Wind Chill Advisory 3, NWS Jacksonville, FL

January 3, 20186 counties in Florida; 12 counties in Georgia

NWS Jacksonville, FL issued this wind chill advisory at Jan 3, 2018, 1:40 PM EST for 6 counties in Florida; 12 counties in Georgia. It took effect at Jan 3, 2018, 7:00 PM EST. It was in force for 16 hr.

The area

The counties it named.

The facts

Issued: Jan 3, 2018, 1:40 PM EST (18:40 UTC)
In effect from: Jan 3, 2018, 7:00 PM EST
Expired: Jan 4, 2018, 11:00 AM EST
In force: 16 hr
Issued by: NWS Jacksonville, FL

Counties Baker County, FL, Bradford County, FL, Gilchrist 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, Clinch County, GA, Coffee County, GA, Echols County, GA, Glynn County, GA, Jeff Davis County, GA, Pierce County, GA, Wayne County, GA

The radar

The Moody AFB radar (KVAX), 62 km from the middle of the area, began a volume at 18:41 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

Tallahassee Rgnl, FL (KTLH), launched 12:00Z, 6.7 hours before the alert went out and 195 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: 1005 m above ground
0-6 km bulk shear: 61 kt
0-1 km storm-relative helicity: 61 m²/s²
0-3 km storm-relative helicity: 123 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 3, 9:45 AM EST, 3 hours 55 minutes earlier.

Area forecast discussion, Jan 3, 9:45 AM EST, 3 hours 55 minutes before

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In the hours before

Local storm report, Jan 3, 12:13 PM EST, 1 hour 27 minutes before

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Local storm report, Jan 3, 12:29 PM EST, 1 hour 11 minutes before

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Local storm report, Jan 3, 12:54 PM EST, 46 minutes before

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Local storm report, Jan 3, 12:55 PM EST, 45 minutes before

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Local storm report, Jan 3, 1:12 PM EST, 28 minutes before

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Local storm report, Jan 3, 1:40 PM EST, 0 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 3, 2:37 AM EST	Gale Warning	JAX		31 hr
Jan 3, 3:27 AM EST	Hard Freeze Warning	JAX	Baker, Bradford, Duval, Flagler, Gilchrist, Nassau and 2 more	32 hr
Jan 3, 3:27 AM EST	Wind Advisory	JAX	Duval, Flagler, Nassau	10 hr
Jan 3, 1:25 PM EST	Hard Freeze Watch	JAX	Baker, Bradford, Duval, Flagler, Gilchrist, Nassau and 2 more	13 hr

Nearby

Wind Chill Advisories in Georgia, 2018 Wind Chill Advisories in Florida, 2018 Every wind chill advisory in 2018

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.