Alert archive / Florida / Mesoscale Discussions in 2017

Mesoscale Discussion 16

January 3, 20178 counties in Florida; Charlton County, Georgia

The Storm Prediction Center issued this mesoscale discussion at Jan 3, 2017, 12:12 PM EST for 8 counties in Florida; Charlton County, Georgia. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Jan 3, 2017, 12:12 PM EST (17:12 UTC)
Expired: Jan 3, 2017, 2:15 PM EST
In force: 2 hr
Issued by: the Storm Prediction Center
Chance of a watch: 5%

Counties Baker County, FL, Bradford County, FL, Clay County, FL, Columbia County, FL, Duval County, FL, Nassau County, FL, Suwannee County, FL, Union County, FL, Charlton County, GA

The radar

The Jacksonville radar (KJAX), 66 km from the middle of the area, began a volume at 17:15 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, 5.2 hours before the alert went out and 67 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: 86 J/kg
Mixed-layer CIN: -92 J/kg
Mixed-layer LCL: 899 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 129 m²/s²
0-3 km storm-relative helicity: 299 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jan 2, 9:15 PM EST	Mesoscale Discussion	SPC	Calhoun, Gadsden, Jackson, Jefferson, Leon, Liberty and 2 more	60 min
Jan 2, 10:27 PM EST	Tornado Watch	SPC	Hamilton, Jefferson, Madison	3 hr
Jan 3, 12:10 AM EST	Mesoscale Discussion	SPC	Baker, Hamilton, Jefferson, Liberty, Madison, Nassau and 1 more	2 hr

Nearby

Mesoscale Discussions in Florida, 2017 Mesoscale Discussions in Georgia, 2017 Every mesoscale discussion in 2017

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.