Alert archive / Georgia / Wind Chill Advisories in 2015

Wind Chill Advisory 2, NWS Jacksonville, FL

February 18, 20158 counties in Florida; 12 counties in Georgia

NWS Jacksonville, FL issued this wind chill advisory at Feb 18, 2015, 8:45 AM EST for 8 counties in Florida; 12 counties in Georgia. It took effect at Feb 19, 2015, 1:00 AM EST. It was in force for 8 hr.

The area

The counties it named.

The facts

Issued: Feb 18, 2015, 8:45 AM EST (13:45 UTC)
In effect from: Feb 19, 2015, 1:00 AM EST
Expired: Feb 19, 2015, 8:57 AM EST
In force: 8 hr
Issued by: NWS Jacksonville, FL

Counties Baker County, FL, Bradford County, FL, Duval County, FL, Flagler 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 Jacksonville radar (KJAX), 66 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

Tallahassee Rgnl, FL (KTLH), launched 12:00Z, 1.8 hours before the alert went out and 200 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: 2196 m above ground
0-6 km bulk shear: 102 kt
0-1 km storm-relative helicity: -150 m²/s²
0-3 km storm-relative helicity: -60 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 Feb 18, 3:26 AM EST, 5 hours 19 minutes earlier.

Area forecast discussion, Feb 18, 3:26 AM EST, 5 hours 19 minutes before

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Hazardous weather outlook, Feb 18, 4:02 AM EST, 4 hours 43 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
Feb 18, 2:04 AM EST	Freeze Warning	JAX	Bradford, Duval, Flagler, Gilchrist, Union	31 hr
Feb 18, 2:04 AM EST	Hard Freeze Watch	JAX	Baker, Bradford, Duval, Flagler, Gilchrist, Nassau and 2 more	24 hr
Feb 18, 2:04 AM EST	Hard Freeze Warning	JAX	Baker, Bradford, Gilchrist, Nassau, Suwannee, Union	31 hr
Feb 18, 2:04 AM EST	Wind Advisory	JAX	Appling, Atkinson, Bacon, Coffee, Jeff Davis, Pierce and 1 more	17 hr

Nearby

Wind Chill Advisories in Georgia, 2015 Wind Chill Advisories in Florida, 2015 Every wind chill advisory in 2015

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.