Alert archive / Georgia / Mesoscale Discussions in 2023

Mesoscale Discussion 35

January 4, 20238 counties in Florida; 14 counties in Georgia

The Storm Prediction Center issued this mesoscale discussion at Jan 4, 2023, 12:36 PM EST for 8 counties in Florida; 14 counties in Georgia. It was in force for 114 min.

The area

The outline as issued.

The facts

Issued: Jan 4, 2023, 12:36 PM EST (17:36 UTC)
Expired: Jan 4, 2023, 2:30 PM EST
In force: 114 min
Issued by: the Storm Prediction Center
Concerning: Tornado watch 13

All 22 counties

Baker County, FL, Columbia County, FL, Hamilton County, FL, Lafayette County, FL, Nassau County, FL, Suwannee County, FL, Taylor County, FL, Union County, FL, Appling County, GA, Bacon County, GA, Brantley County, GA, Camden County, GA, Charlton County, GA, Clinch County, GA, Echols County, GA, Glynn County, GA, Liberty County, GA, Long County, GA, McIntosh County, GA, Pierce County, GA, Ware County, GA, Wayne County, GA

The radar

The Moody AFB radar (KVAX), 46 km from the middle of the area, began a volume at 17:35 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, 5.6 hours before the alert went out and 88 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: 430 J/kg
Mixed-layer CIN: -19 J/kg
Mixed-layer LCL: 615 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 193 m²/s²
0-3 km storm-relative helicity: 209 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 3.3

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 4, 3:06 AM EST	Mesoscale Discussion	SPC	Escambia, Holmes, Okaloosa, Santa Rosa, Walton, Washington	114 min
Jan 4, 3:59 AM EST	Tornado Watch	SPC	Bay, Calhoun, Escambia, Gadsden, Gulf, Holmes and 6 more	7 hr
Jan 4, 8:07 AM EST	Mesoscale Discussion	SPC	Bay, Calhoun, Franklin, Gadsden, Gulf, Hamilton and 9 more	113 min
Jan 4, 8:36 AM EST	Tornado Watch	SPC	Alachua, Baker, Bradford, Clay, Columbia, Duval and 15 more	9 hr
Jan 4, 3:26 PM EST	Mesoscale Discussion	SPC	Alachua, Bradford, Clay, Duval, Flagler, Marion and 4 more	94 min

Nearby

Mesoscale Discussions in Georgia, 2023 Mesoscale Discussions in Florida, 2023 Every mesoscale discussion in 2023

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.