Alert archive / Florida / Frost Advisories in 2016

Frost Advisory 1, NWS Jacksonville, FL

January 12, 2016Nassau County, Florida

NWS Jacksonville, FL issued this frost advisory at Jan 12, 2016, 2:11 PM EST for Nassau County, Florida. It took effect at Jan 13, 2016, 3:00 AM EST. It was in force for 6 hr.

The area

The counties it named.

The facts

Issued: Jan 12, 2016, 2:11 PM EST (19:11 UTC)
In effect from: Jan 13, 2016, 3:00 AM EST
Expired: Jan 13, 2016, 8:40 AM EST
In force: 6 hr
Issued by: NWS Jacksonville, FL

County Nassau County, FL

The radar

The Jacksonville radar (KJAX), 16 km from the middle of the area, began a volume at 19:10 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

Jacksonville, FL (KJAX), launched 12:00Z, 7.2 hours before the alert went out and 14 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: 2921 m above ground
0-6 km bulk shear: 76 kt
0-1 km storm-relative helicity: -63 m²/s²
0-3 km storm-relative helicity: 23 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 frost 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 frost advisory went out at Jan 12, 8:56 AM EST, 5 hours 15 minutes earlier.

Area forecast discussion, Jan 12, 8:56 AM EST, 5 hours 15 minutes before

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Hazardous weather outlook, Jan 12, 9:20 AM EST, 4 hours 51 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 12, 2:38 AM EST	Freeze Watch	JAX	Baker, Bradford, Gilchrist, Suwannee, Union	12 hr
Jan 12, 9:15 AM EST	Small Craft Advisory	JAX		24 hr
Jan 12, 2:11 PM EST	Freeze Warning	JAX	Baker, Bradford, Gilchrist, Suwannee, Union	18 hr

Nearby

Frost Advisories in Florida, 2016 Every frost advisory in 2016

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.