Alert archive / Florida / Severe Thunderstorm Warnings in 2023

Severe Thunderstorm Warning 20, NWS Jacksonville, FL

January 4, 2023Duval County, Saint Johns County, Florida

NWS Jacksonville, FL issued this severe thunderstorm warning at Jan 4, 2023, 4:14 PM EST for Duval County, Saint Johns County, Florida. It was in force for 31 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jan 4, 2023, 4:14 PM EST (21:14 UTC)
Expired: Jan 4, 2023, 4:45 PM EST
In force: 31 min
Issued by: NWS Jacksonville, FL
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Duval County, FL, Saint Johns County, FL

The radar

The Jacksonville radar (KJAX), 43 km from the middle of the area, began a volume at 21:15 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jan 4, 8:36 AM EST	Tornado Watch	SPC	9 hr

The nearest sounding before it

Jacksonville, FL (KJAX), launched 12:00Z, 9.2 hours before the alert went out and 45 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

What forecasters said that day

The local office's own words before this severe thunderstorm warning 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 severe thunderstorm warning went out at Jan 4, 3:01 PM EST, 1 hour 13 minutes earlier.

Area forecast discussion, Jan 4, 3:01 PM EST, 1 hour 13 minutes before

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In the hours before

Special weather statement, Jan 4, 3:59 PM EST, 15 minutes before

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Local storm report, Jan 4, 4:00 PM EST, 14 minutes before

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Local storm report, Jan 4, 4:02 PM EST, 12 minutes before

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Special weather statement, Jan 4, 4:08 PM EST, 6 minutes before

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Special weather statement, Jan 4, 4:12 PM EST, 2 minutes before

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Local storm report, Jan 4, 4:13 PM EST, 1 minute 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 4, 11:25 AM EST	Special Weather Statement	JAX	Hamilton, Suwannee	65 min
Jan 4, 11:39 AM EST	Severe Thunderstorm Warning	JAX	Hamilton, Suwannee	36 min
Jan 4, 12:14 PM EST	Severe Thunderstorm Warning	JAX	Columbia, Hamilton, Suwannee	46 min
Jan 4, 1:05 PM EST	Special Weather Statement	JAX	Baker	40 min
Jan 4, 1:07 PM EST	Special Weather Statement	JAX	Hamilton, Suwannee	38 min
Jan 4, 1:11 PM EST	Severe Thunderstorm Warning	JAX	Nassau	34 min
Jan 4, 1:32 PM EST	Severe Thunderstorm Warning	JAX	Baker, Columbia, Hamilton, Nassau	43 min
Jan 4, 1:40 PM EST	Tornado Warning	JAX	Baker, Columbia	35 min
Jan 4, 1:43 PM EST	Special Weather Statement	JAX	Columbia	32 min
Jan 4, 2:04 PM EST	Special Marine Warning	JAX		56 min
Jan 4, 2:17 PM EST	Severe Thunderstorm Warning	JAX	Baker, Columbia, Gilchrist, Nassau, Suwannee, Union	28 min
Jan 4, 2:20 PM EST	Special Weather Statement	JAX	Gilchrist	25 min
Jan 4, 2:40 PM EST	Severe Thunderstorm Warning	JAX	Alachua, Bradford, Columbia, Gilchrist, Union	35 min
Jan 4, 2:43 PM EST	Severe Thunderstorm Warning	JAX	Alachua, Bradford, Columbia, Gilchrist, Union	47 min
Jan 4, 2:47 PM EST	Severe Thunderstorm Warning Considerable damage threat	JAX	Nassau	28 min
Jan 4, 2:50 PM EST	Severe Thunderstorm Warning	JAX	Baker, Bradford, Columbia, Union	25 min
Jan 4, 2:51 PM EST	Special Weather Statement	JAX	Putnam	24 min
Jan 4, 3:11 PM EST	Severe Thunderstorm Warning Considerable damage threat	JAX	Baker, Bradford, Clay, Duval, Nassau, Union	49 min
Jan 4, 3:14 PM EST	Severe Thunderstorm Warning Considerable damage threat	JAX	Alachua, Bradford, Gilchrist, Marion	46 min
Jan 4, 3:15 PM EST	Severe Thunderstorm Warning Considerable damage threat	JAX	Duval, Nassau	45 min
Jan 4, 3:17 PM EST	Special Marine Warning	JAX		88 min
Jan 4, 3:44 PM EST	Severe Thunderstorm Warning Considerable damage threat	JAX	Bradford, Clay, Duval, Saint Johns	46 min
Jan 4, 3:57 PM EST	Severe Thunderstorm Warning Considerable damage threat	JAX	Alachua, Bradford, Clay, Marion, Putnam	48 min
Jan 4, 3:59 PM EST	Special Weather Statement	JAX	Nassau	31 min
Jan 4, 4:06 PM EST	Special Marine Warning	JAX		54 min
Jan 4, 4:08 PM EST	Special Weather Statement	JAX	Saint Johns	67 min
Jan 4, 4:12 PM EST	Special Weather Statement	JAX	Marion	63 min
Jan 4, 4:21 PM EST	Special Marine Warning	JAX		84 min
Jan 4, 4:48 PM EST	Special Weather Statement	JAX	Putnam, Saint Johns	27 min
Jan 4, 4:52 PM EST	Special Marine Warning	JAX		83 min
Jan 4, 4:58 PM EST	Special Weather Statement	JAX	Marion, Putnam	62 min
Jan 4, 5:14 PM EST	Severe Thunderstorm Warning	JAX	Flagler, Saint Johns	19 min
Jan 4, 6:14 PM EST	Special Marine Warning	JAX		91 min
Jan 4, 9:49 AM EST	Special Weather Statement	JAX	Jeff Davis	56 min
Jan 4, 10:46 AM EST	Special Weather Statement	JAX	Coffee, Jeff Davis	29 min
Jan 4, 11:42 AM EST	Severe Thunderstorm Warning	JAX	Atkinson, Clinch	33 min
Jan 4, 12:04 PM EST	Tornado Warning	JAX	Atkinson, Clinch	26 min
Jan 4, 12:16 PM EST	Special Weather Statement	JAX	Appling, Bacon	29 min
Jan 4, 12:29 PM EST	Tornado Warning	JAX	Atkinson, Ware	31 min
Jan 4, 12:30 PM EST	Tornado Warning	JAX	Clinch	15 min
Jan 4, 12:46 PM EST	Severe Thunderstorm Warning	JAX	Charlton, Clinch, Ware	29 min
Jan 4, 12:51 PM EST	Severe Thunderstorm Warning	JAX	Appling, Bacon, Brantley, Pierce, Ware	24 min
Jan 4, 1:02 PM EST	Tornado Warning	JAX	Pierce	18 min
Jan 4, 1:27 PM EST	Tornado Warning	JAX	Camden, Charlton	18 min
Jan 4, 1:47 PM EST	Severe Thunderstorm Warning	JAX	Camden, Charlton, Glynn	28 min
Jan 4, 1:50 PM EST	Special Weather Statement	JAX	Glynn	25 min
Jan 4, 2:01 PM EST	Tornado Warning Tornado observed	JAX	Camden, Glynn	14 min
Jan 4, 2:12 PM EST	Tornado Warning	JAX	Camden, Glynn	18 min
Jan 4, 2:28 PM EST	Severe Thunderstorm Warning	JAX	Camden, Glynn	17 min
Jan 4, 2:59 PM EST	Special Weather Statement	JAX	Camden	46 min

Nearby

Severe Thunderstorm Warnings in Florida, 2023 Every severe thunderstorm warning 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.