Alert archive / Georgia / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 231, NWS Jacksonville, FL

December 1, 2018Nassau County, Florida; Camden County, Charlton County, Glynn County, Georgia

NWS Jacksonville, FL issued this severe thunderstorm warning at Dec 1, 2018, 11:31 PM EST for Nassau County, Florida; Camden County, Charlton County, Glynn County, Georgia. It was in force for 59 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: Dec 1, 2018, 11:31 PM EST (04:31 UTC)
Expired: Dec 2, 2018, 12:30 AM EST
In force: 59 min
Issued by: NWS Jacksonville, FL
Area: Storm-based polygon
Tornado: Possible
Hail: 0.75 in
Wind: 60.0 mph

Counties Nassau County, FL, Camden County, GA, Charlton County, GA, Glynn County, GA

The radar

The Jacksonville radar (KJAX), 45 km from the middle of the area, began a volume at 04:33 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 00:00Z, 4.5 hours before the alert went out and 43 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: 103 J/kg
Mixed-layer CIN: -96 J/kg
Mixed-layer LCL: 548 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 325 m²/s²
0-3 km storm-relative helicity: 347 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.7

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 Dec 1, 8:23 PM EST, 3 hours 8 minutes earlier.

Area forecast discussion, Dec 1, 8:23 PM EST, 3 hours 8 minutes before

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In the hours before

Special weather statement, Dec 1, 9:22 PM EST, 2 hours 9 minutes before

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Local storm report, Dec 1, 9:50 PM EST, 1 hour 41 minutes before

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Special weather statement, Dec 1, 9:50 PM EST, 1 hour 41 minutes before

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Special weather statement, Dec 1, 10:34 PM EST, 57 minutes before

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Special weather statement, Dec 1, 11:21 PM EST, 10 minutes before

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Special weather statement, Dec 1, 11:21 PM EST, 10 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
Dec 1, 8:29 PM EST	Special Weather Statement	JAX	Hamilton	16 min
Dec 1, 10:48 PM EST	Special Marine Warning	JAX		87 min
Dec 2, 12:08 AM EST	Special Marine Warning	JAX		2 hr
Dec 2, 12:29 PM EST	Special Weather Statement	JAX	Hamilton	31 min
Dec 2, 1:48 PM EST	Tornado Warning	JAX	Columbia	27 min
Dec 2, 2:24 PM EST	Special Marine Warning	JAX		2 hr
Dec 2, 2:37 PM EST	Severe Thunderstorm Warning	JAX	Nassau	23 min
Dec 2, 2:41 PM EST	Tornado Warning	JAX	Nassau	34 min
Dec 2, 2:59 PM EST	Areal Flood Advisory	JAX	Nassau	3 hr
Dec 2, 3:00 PM EST	Tornado Warning	JAX	Nassau	30 min
Dec 2, 3:04 PM EST	Severe Thunderstorm Warning	JAX	Nassau	41 min
Dec 2, 3:06 PM EST	Special Weather Statement	JAX	Saint Johns	39 min
Dec 2, 3:16 PM EST	Special Marine Warning	JAX		59 min
Dec 2, 3:20 PM EST	Severe Thunderstorm Warning	JAX	Nassau	40 min
Dec 2, 3:34 PM EST	Special Weather Statement	JAX	Baker, Columbia	41 min
Dec 2, 3:34 PM EST	Tornado Warning	JAX	Nassau	26 min
Dec 2, 3:49 PM EST	Areal Flood Advisory	JAX	Baker, Nassau	3 hr
Dec 2, 3:59 PM EST	Severe Thunderstorm Warning	JAX	Nassau	46 min
Dec 2, 4:16 PM EST	Special Marine Warning	JAX		89 min
Dec 2, 4:26 PM EST	Severe Thunderstorm Warning	JAX	Nassau	34 min
Dec 2, 4:55 PM EST	Special Weather Statement	JAX	Nassau	35 min
Dec 2, 5:44 PM EST	Special Marine Warning	JAX		61 min
Dec 2, 5:56 PM EST	Areal Flood Advisory	JAX	Hamilton	2 hr
Dec 1, 7:48 PM EST	Special Weather Statement	JAX	Atkinson, Coffee, Jeff Davis	42 min
Dec 1, 8:09 PM EST	Special Weather Statement	JAX	Clinch	36 min
Dec 1, 8:27 PM EST	Areal Flood Advisory	JAX	Atkinson, Bacon, Coffee, Jeff Davis	3 hr
Dec 1, 8:27 PM EST	Special Weather Statement	JAX	Atkinson, Bacon	33 min
Dec 1, 8:48 PM EST	Special Weather Statement	JAX	Clinch, Echols	27 min
Dec 1, 9:22 PM EST	Special Weather Statement	JAX	Glynn	23 min
Dec 1, 9:50 PM EST	Special Weather Statement	JAX	Brantley, Charlton, Pierce, Ware	55 min
Dec 1, 10:34 PM EST	Special Weather Statement	JAX	Brantley, Glynn	41 min
Dec 1, 10:56 PM EST	Severe Thunderstorm Warning	JAX	Camden, Glynn	34 min
Dec 1, 11:04 PM EST	Areal Flood Advisory	JAX	Clinch, Echols	116 min
Dec 1, 11:14 PM EST	Areal Flood Advisory	JAX	Glynn	2 hr
Dec 1, 11:21 PM EST	Special Weather Statement	JAX	Camden	54 min
Dec 1, 11:53 PM EST	Tornado Warning	JAX	Camden, Glynn	37 min
Dec 2, 12:27 AM EST	Special Weather Statement	JAX	Camden	63 min
Dec 2, 6:08 AM EST	Special Weather Statement	JAX	Bacon	52 min
Dec 2, 6:38 AM EST	Special Weather Statement	JAX	Pierce	52 min
Dec 2, 6:42 AM EST	Severe Thunderstorm Warning	JAX	Appling, Bacon, Coffee, Jeff Davis	48 min
Dec 2, 6:45 AM EST	Tornado Warning	JAX	Appling, Bacon, Coffee, Jeff Davis	30 min
Dec 2, 7:13 AM EST	Special Weather Statement	JAX	Appling	47 min
Dec 2, 7:36 AM EST	Areal Flood Advisory	JAX	Appling, Bacon, Jeff Davis	2 hr
Dec 2, 7:58 AM EST	Areal Flood Advisory	JAX	Brantley, Clinch, Pierce, Ware, Wayne	3 hr
Dec 2, 8:20 AM EST	Special Weather Statement	JAX	Brantley	40 min
Dec 2, 8:47 AM EST	Areal Flood Advisory	JAX	Coffee, Jeff Davis	3 hr
Dec 2, 10:01 AM EST	River Flood Warning	JAX	Appling, Tattnall, Toombs, Wayne	69 days
Dec 2, 11:35 AM EST	Areal Flood Advisory	JAX	Clinch, Echols, Ware	3 hr
Dec 2, 11:36 AM EST	Areal Flood Advisory	JAX	Appling, Bacon, Coffee, Jeff Davis	3 hr
Dec 2, 12:00 PM EST	Special Weather Statement	JAX	Clinch	45 min
Dec 2, 12:44 PM EST	Special Weather Statement	JAX	Clinch, Echols, Ware	46 min
Dec 2, 12:56 PM EST	Areal Flood Warning	JAX	Brantley, Clinch, Pierce, Ware	6 hr
Dec 2, 1:29 PM EST	Flood Watch	JAX	Appling, Atkinson, Bacon, Brantley, Camden, Clinch and 6 more	30 hr
Dec 2, 1:40 PM EST	Special Weather Statement	JAX	Charlton, Echols	50 min
Dec 2, 1:46 PM EST	Special Weather Statement	JAX	Coffee	44 min
Dec 2, 2:00 PM EST	Special Weather Statement	JAX	Brantley	60 min
Dec 2, 2:04 PM EST	Areal Flood Advisory	JAX	Brantley, Charlton, Clinch, Echols, Ware	3 hr
Dec 2, 2:06 PM EST	Severe Thunderstorm Warning	JAX	Atkinson	28 min
Dec 2, 2:13 PM EST	Tornado Warning	JAX	Atkinson	19 min
Dec 2, 2:31 PM EST	Severe Thunderstorm Warning	JAX	Atkinson, Coffee	18 min
Dec 2, 2:36 PM EST	Severe Thunderstorm Warning	JAX	Camden, Glynn	39 min
Dec 2, 2:40 PM EST	Areal Flood Advisory	JAX	Atkinson, Bacon, Coffee	3 hr
Dec 2, 2:44 PM EST	Severe Thunderstorm Warning	JAX	Atkinson, Coffee, Ware	16 min
Dec 2, 2:46 PM EST	Special Weather Statement	JAX	Appling	14 min
Dec 2, 3:08 PM EST	Special Weather Statement	JAX	Clinch	37 min
Dec 2, 3:47 PM EST	Areal Flood Advisory	JAX	Atkinson, Clinch, Ware	3 hr
Dec 2, 4:58 PM EST	Special Weather Statement	JAX	Clinch, Echols	32 min
Dec 2, 5:17 PM EST	Special Weather Statement	JAX	Ware	43 min
Dec 2, 5:36 PM EST	Special Weather Statement	JAX	Clinch, Echols	39 min
Dec 2, 5:38 PM EST	Severe Thunderstorm Warning	JAX	Brantley, Charlton, Ware	37 min
Dec 2, 6:14 PM EST	Special Weather Statement	JAX	Brantley, Glynn	46 min
Dec 2, 6:16 PM EST	Special Weather Statement	JAX	Charlton	44 min
Dec 2, 6:38 PM EST	Special Weather Statement	JAX	Clinch	37 min
Dec 2, 6:54 PM EST	Areal Flood Advisory	JAX	Brantley, Charlton, Clinch, Echols, Pierce, Ware	4 hr

Nearby

Severe Thunderstorm Warnings in Georgia, 2018 Severe Thunderstorm Warnings in Florida, 2018 Every severe thunderstorm warning in 2018

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.