Alert archive / Georgia / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 191, NWS Jacksonville, FL

August 13, 20184 counties in Georgia

NWS Jacksonville, FL issued this severe thunderstorm warning at Aug 13, 2018, 2:43 PM EDT for 4 counties in Georgia. It was in force for 15 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: Aug 13, 2018, 2:43 PM EDT (18:43 UTC)
Expired: Aug 13, 2018, 2:58 PM EDT
In force: 15 min
Issued by: NWS Jacksonville, FL
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Appling County, GA, Bacon County, GA, Pierce County, GA, Wayne County, GA

The radar

The Moody AFB radar (KVAX), 105 km from the middle of the area, began a volume at 18:46 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, 6.7 hours before the alert went out and 127 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: 1399 J/kg
Mixed-layer CIN: -31 J/kg
Mixed-layer LCL: 804 m above ground
0-6 km bulk shear: 11 kt
0-1 km storm-relative helicity: 28 m²/s²
0-3 km storm-relative helicity: 30 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 Aug 13, 8:38 AM EDT, 6 hours 5 minutes earlier.

Area forecast discussion, Aug 13, 8:38 AM EDT, 6 hours 5 minutes before

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In the hours before

Special weather statement, Aug 13, 1:49 PM EDT, 54 minutes before

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Special weather statement, Aug 13, 1:53 PM EDT, 50 minutes before

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Special weather statement, Aug 13, 2:24 PM EDT, 19 minutes before

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Special weather statement, Aug 13, 2:27 PM EDT, 16 minutes before

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Special weather statement, Aug 13, 2:29 PM EDT, 14 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
Aug 12, 9:05 PM EDT	Areal Flood Advisory	JAX	Baker	85 min
Aug 12, 9:10 PM EDT	Areal Flood Warning	JAX	Baker, Columbia	3 hr
Aug 12, 9:30 PM EDT	Areal Flood Advisory	JAX	Baker, Columbia	2 hr
Aug 12, 11:00 PM EDT	Areal Flood Advisory	JAX	Columbia	60 min
Aug 13, 6:19 AM EDT	Areal Flood Advisory	JAX	Columbia, Suwannee	3 hr
Aug 13, 7:45 AM EDT	Areal Flood Advisory	JAX	Suwannee	2 hr
Aug 13, 8:13 AM EDT	Areal Flood Advisory	JAX	Suwannee	2 hr
Aug 13, 8:44 AM EDT	Areal Flood Advisory	JAX	Suwannee	2 hr
Aug 13, 1:47 PM EDT	Special Marine Warning	JAX		58 min
Aug 13, 1:56 PM EDT	Areal Flood Advisory	JAX	Union	2 hr
Aug 13, 2:24 PM EDT	Special Weather Statement	JAX	Baker	36 min
Aug 13, 2:37 PM EDT	Special Marine Warning	JAX		53 min
Aug 13, 2:46 PM EDT	Special Weather Statement	JAX	Hamilton	29 min
Aug 13, 3:01 PM EDT	Special Weather Statement	JAX	Saint Johns	44 min
Aug 13, 3:02 PM EDT	Special Weather Statement	JAX	Baker	43 min
Aug 13, 3:17 PM EDT	Special Marine Warning	JAX		58 min
Aug 13, 3:41 PM EDT	Special Weather Statement	JAX	Duval	34 min
Aug 13, 3:52 PM EDT	Special Weather Statement	JAX	Nassau	23 min
Aug 13, 3:54 PM EDT	Special Weather Statement	JAX	Columbia	36 min
Aug 13, 4:20 PM EDT	Areal Flood Advisory	JAX	Alachua, Columbia, Union	3 hr
Aug 13, 5:03 PM EDT	Special Weather Statement	JAX	Hamilton	42 min
Aug 13, 7:18 PM EDT	Special Marine Warning	JAX		57 min
Aug 13, 7:19 PM EDT	Special Weather Statement	JAX	Flagler	26 min
Aug 13, 1:49 PM EDT	Special Weather Statement	JAX	Camden	41 min
Aug 13, 1:53 PM EDT	Special Weather Statement	JAX	Brantley	52 min
Aug 13, 2:27 PM EDT	Special Weather Statement	JAX	Brantley	33 min
Aug 13, 2:29 PM EDT	Special Weather Statement	JAX	Pierce	31 min
Aug 13, 2:58 PM EDT	Special Weather Statement	JAX	Appling	32 min
Aug 13, 3:04 PM EDT	Special Weather Statement	JAX	Echols	26 min
Aug 13, 3:07 PM EDT	Areal Flood Warning	JAX	Appling, Bacon, Pierce, Wayne	3 hr
Aug 13, 4:02 PM EDT	Special Weather Statement	JAX	Pierce	28 min
Aug 13, 4:15 PM EDT	Severe Thunderstorm Warning	JAX	Brantley, Pierce, Wayne	45 min
Aug 13, 4:25 PM EDT	Special Weather Statement	JAX	Pierce	50 min
Aug 13, 4:32 PM EDT	Special Weather Statement	JAX	Echols	28 min
Aug 13, 4:39 PM EDT	Severe Thunderstorm Warning	JAX	Bacon, Pierce, Ware	28 min
Aug 13, 4:46 PM EDT	Special Weather Statement	JAX	Ware	29 min
Aug 13, 4:53 PM EDT	Special Weather Statement	JAX	Brantley	37 min
Aug 13, 5:00 PM EDT	Special Weather Statement	JAX	Pierce	30 min
Aug 13, 5:06 PM EDT	Special Weather Statement	JAX	Pierce	39 min
Aug 13, 5:13 PM EDT	Special Weather Statement	JAX	Atkinson	32 min
Aug 13, 5:22 PM EDT	Areal Flood Advisory	JAX	Ware	113 min
Aug 13, 5:25 PM EDT	Areal Flood Advisory	JAX	Bacon, Brantley, Pierce, Ware, Wayne	2 hr
Aug 13, 5:28 PM EDT	Special Weather Statement	JAX	Brantley	47 min
Aug 13, 5:45 PM EDT	Special Weather Statement	JAX	Pierce	45 min
Aug 13, 5:47 PM EDT	Special Weather Statement	JAX	Atkinson	28 min
Aug 13, 6:01 PM EDT	Areal Flood Warning	JAX	Ware	119 min
Aug 13, 6:19 PM EDT	Areal Flood Advisory	JAX	Atkinson, Clinch, Ware	3 hr
Aug 13, 6:23 PM EDT	Special Weather Statement	JAX	Atkinson	37 min
Aug 13, 6:44 PM EDT	Areal Flood Warning	JAX	Ware	3 hr
Aug 13, 7:14 PM EDT	Areal Flood Advisory	JAX	Coffee	3 hr

Nearby

Severe Thunderstorm Warnings in Georgia, 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.