Alert archive / Florida / Mesoscale Discussions in 2023

Mesoscale Discussion 38

January 4, 202310 counties in Florida

The Storm Prediction Center issued this mesoscale discussion at Jan 4, 2023, 3:26 PM EST for 10 counties in Florida. It was in force for 94 min.

The area

The outline as issued.

The facts

Issued: Jan 4, 2023, 3:26 PM EST (20:26 UTC)
Expired: Jan 4, 2023, 5:00 PM EST
In force: 94 min
Issued by: the Storm Prediction Center
Concerning: Tornado watch 14

Counties Alachua County, FL, Bradford County, FL, Clay County, FL, Duval County, FL, Flagler County, FL, Marion County, FL, Nassau County, FL, Putnam County, FL, Saint Johns County, FL, Union County, FL

The radar

The Jacksonville radar (KJAX), 86 km from the middle of the area, began a volume at 20:29 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, 8.4 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, 12:36 PM EST	Mesoscale Discussion	SPC	Baker, Columbia, Hamilton, Lafayette, Nassau, Suwannee and 2 more	114 min

Nearby

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.