Alert archive / Georgia / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 27, NWS Jacksonville, FL

April 15, 2018Brantley County, Glynn County, Wayne County, Georgia

NWS Jacksonville, FL issued this severe thunderstorm warning at Apr 15, 2018, 2:15 PM EDT for Brantley County, Glynn County, Wayne County, Georgia. It was in force for 45 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: Apr 15, 2018, 2:15 PM EDT (18:15 UTC)
Expired: Apr 15, 2018, 3:00 PM EDT
In force: 45 min
Issued by: NWS Jacksonville, FL
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Brantley County, GA, Glynn County, GA, Wayne County, GA

The radar

The Jacksonville radar (KJAX), 93 km from the middle of the area, began a volume at 18:14 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
Apr 15, 10:12 AM EDT	Tornado Watch	SPC	8 hr

The nearest sounding before it

Jacksonville, FL (KJAX), launched 12:00Z, 6.3 hours before the alert went out and 92 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: 651 J/kg
Mixed-layer CIN: -59 J/kg
Mixed-layer LCL: 809 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 147 m²/s²
0-3 km storm-relative helicity: 145 m²/s²
Significant tornado parameter: 0.5
Supercell composite: 3.1

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 Apr 15, 10:16 AM EDT, 3 hours 59 minutes earlier.

Area forecast discussion, Apr 15, 10:16 AM EDT, 3 hours 59 minutes before

Area Forecast Discussion
National Weather Service Jacksonville FL
1016 AM EDT Sun Apr 15 2018

...TORNADO WATCH IN EFFECT FOR THE AREA UNTIL 6PM...

.UPDATE...Line of t-storms approaching our western
counties has reintensified a little earlier than expected,
but timing on track. Satellite shows partial heating with
temps now approaching 80 degrees. Planning 16z sounding
launch to evaluate changes to low-level inversion when
it comes to potential for supercell development ahead of
line. Primary threat continues to be 50-70 mph winds along
bowing segments of line, but potential for brief tornadoes
exists given strong low-level shear, with best chance where
breaks develop along line, and with any intense storms that
can form this afternoon ahead of the line.

&&

.PRELIMINARY POINT TEMPS/POPS...
AMG  78  44  63  42 / 100  10   0   0
SSI  74  49  64  48 /  90  20   0   0
JAX  83  48  69  47 /  90  20   0   0
SGJ  82  51  69  49 /  90  20   0   0
GNV  80  48  68  44 /  90  10   0   0
OCF  82  49  69  45 /  90  10   0   0

&&

.JAX WATCHES/WARNINGS/ADVISORIES...
FL...Wind Advisory until 6 PM EDT this evening for Alachua-Baker-
     Bradford-Clay-Coastal Duval-Coastal Nassau-Columbia-Flagler-
     Gilchrist-Hamilton-Inland Duval-Inland Nassau-Marion-Putnam-
     St. Johns-Suwannee-Union.

GA...Wind Advisory until 6 PM EDT this evening for Appling-Atkinson-
     Bacon-Brantley-Charlton-Clinch-Coastal Camden-Coastal Glynn-
     Coffee-Echols-Inland Camden-Inland Glynn-Jeff Davis-Pierce-
     Ware-Wayne.

AM...Small Craft Advisory until 4 PM EDT Monday for Waters from
     Altamaha Sound GA to Fernandina Beach FL from 20 to 60 NM-
     Waters from Fernandina Beach to St. Augustine FL from 20 to
     60 NM-Waters from St. Augustine to Flagler Beach FL from 20
     to 60 NM.

     Small Craft Advisory until 10 AM EDT Monday for Coastal waters
     from Altamaha Sound to Fernandina Beach FL out 20 NM-
     Coastal waters from Fernandina Beach to St. Augustine FL
     out 20 NM-Coastal waters from St. Augustine to Flagler
     Beach FL out 20 NM.

&&

Wolf/Nelson/Elsenheimer

In the hours before

Special weather statement, Apr 15, 1:31 PM EDT, 44 minutes before

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Special weather statement, Apr 15, 1:38 PM EDT, 37 minutes before

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Local storm report, Apr 15, 1:54 PM EDT, 21 minutes before

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Special weather statement, Apr 15, 1:57 PM EDT, 18 minutes before

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Local storm report, Apr 15, 2:11 PM EDT, 4 minutes before

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Special weather statement, Apr 15, 2:14 PM EDT, 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
Apr 15, 3:24 AM EDT	Wind Advisory	JAX	Baker, Bradford, Duval, Flagler, Gilchrist, Nassau and 2 more	13 hr
Apr 15, 9:57 AM EDT	Special Weather Statement	JAX	Hamilton, Suwannee	63 min
Apr 15, 10:09 AM EDT	Severe Thunderstorm Warning	JAX	Hamilton, Suwannee	66 min
Apr 15, 11:13 AM EDT	Severe Thunderstorm Warning	JAX	Columbia, Hamilton, Suwannee	47 min
Apr 15, 12:01 PM EDT	Severe Thunderstorm Warning	JAX	Baker, Columbia, Hamilton, Suwannee	44 min
Apr 15, 12:16 PM EDT	Special Weather Statement	JAX	Gilchrist	59 min
Apr 15, 12:45 PM EDT	Special Weather Statement	JAX	Columbia, Gilchrist	45 min
Apr 15, 1:16 PM EDT	Special Weather Statement	JAX	Marion	44 min
Apr 15, 1:21 PM EDT	Special Weather Statement	JAX	Alachua, Bradford, Union	39 min
Apr 15, 1:31 PM EDT	Special Weather Statement	JAX	Columbia, Gilchrist	44 min
Apr 15, 1:57 PM EDT	Special Weather Statement	JAX	Alachua, Bradford, Marion, Union	48 min
Apr 15, 2:07 PM EDT	Severe Thunderstorm Warning	JAX	Alachua, Clay, Marion, Putnam	53 min
Apr 15, 2:14 PM EDT	Special Weather Statement	JAX	Nassau	46 min
Apr 15, 2:15 PM EDT	Special Marine Warning	JAX		60 min
Apr 15, 2:16 PM EDT	Severe Thunderstorm Warning	JAX	Alachua, Baker, Bradford, Clay, Duval, Nassau	44 min
Apr 15, 2:23 PM EDT	Severe Thunderstorm Warning	JAX	Nassau	52 min
Apr 15, 2:40 PM EDT	Severe Thunderstorm Warning	JAX	Alachua, Bradford, Marion, Putnam	50 min
Apr 15, 2:45 PM EDT	Severe Thunderstorm Warning	JAX	Clay, Duval, Nassau, Saint Johns	45 min
Apr 15, 3:06 PM EDT	Special Marine Warning	JAX		84 min
Apr 15, 3:09 PM EDT	Special Weather Statement	JAX	Flagler, Saint Johns	66 min
Apr 15, 3:10 PM EDT	Special Marine Warning	JAX		2 hr
Apr 15, 3:14 PM EDT	Severe Thunderstorm Warning	JAX	Nassau	46 min
Apr 15, 3:22 PM EDT	Severe Thunderstorm Warning	JAX	Duval, Flagler, Nassau, Saint Johns	38 min
Apr 15, 3:40 PM EDT	Special Marine Warning	JAX		2 hr
Apr 15, 5:00 PM EDT	Special Marine Warning	JAX		45 min
Apr 15, 6:34 PM EDT	Special Marine Warning	JAX		41 min
Apr 15, 10:14 AM EDT	Severe Thunderstorm Warning	JAX	Atkinson, Coffee, Jeff Davis	61 min
Apr 15, 11:05 AM EDT	Special Weather Statement	JAX	Appling, Bacon, Jeff Davis	55 min
Apr 15, 11:15 AM EDT	Severe Thunderstorm Warning	JAX	Appling, Atkinson, Bacon, Coffee, Jeff Davis, Ware	45 min
Apr 15, 11:56 AM EDT	Severe Thunderstorm Warning	JAX	Appling, Bacon, Jeff Davis, Pierce, Wayne	49 min
Apr 15, 12:42 PM EDT	Special Weather Statement	JAX	Brantley, Charlton, Wayne	63 min
Apr 15, 1:38 PM EDT	Special Weather Statement	JAX	Brantley, Charlton	52 min
Apr 15, 2:34 PM EDT	Severe Thunderstorm Warning	JAX	Camden, Glynn	41 min
Apr 15, 2:54 PM EDT	Tornado Warning	JAX	Camden, Glynn	27 min
Apr 15, 3:23 PM EDT	Severe Thunderstorm Warning	JAX	Camden, Glynn	52 min

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.