Alert archive / Georgia / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 218, NWS Jacksonville, FL

September 27, 2018Glynn County, Wayne County, Georgia

NWS Jacksonville, FL issued this severe thunderstorm warning at Sep 27, 2018, 6:51 PM EDT for Glynn County, Wayne County, Georgia. It was in force for 39 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: Sep 27, 2018, 6:51 PM EDT (22:51 UTC)
Expired: Sep 27, 2018, 7:30 PM EDT
In force: 39 min
Issued by: NWS Jacksonville, FL
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Glynn County, GA, Wayne County, GA

The radar

The Jacksonville radar (KJAX), 100 km from the middle of the area, began a volume at 22:54 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

Charleston AFB, SC (KCHS), launched 12:00Z, 10.9 hours before the alert went out and 233 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: 1074 J/kg
Mixed-layer CIN: -40 J/kg
Mixed-layer LCL: 857 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 83 m²/s²
0-3 km storm-relative helicity: 105 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.3

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 Sep 27, 5:02 PM EDT, 1 hour 49 minutes earlier.

Area forecast discussion, Sep 27, 5:02 PM EDT, 1 hour 49 minutes before

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In the hours before

Special weather statement, Sep 27, 3:27 PM EDT, 3 hours 24 minutes before

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Special weather statement, Sep 27, 4:33 PM EDT, 2 hours 18 minutes before

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Special weather statement, Sep 27, 4:42 PM EDT, 2 hours 9 minutes before

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Special weather statement, Sep 27, 4:48 PM EDT, 2 hours 3 minutes before

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Special weather statement, Sep 27, 6:37 PM EDT, 14 minutes before

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Special weather statement, Sep 27, 6:45 PM EDT, 6 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
Sep 26, 8:00 PM EDT	Special Weather Statement	JAX	Putnam	30 min
Sep 26, 8:21 PM EDT	Areal Flood Advisory	JAX	Clay, Putnam	54 min
Sep 26, 8:33 PM EDT	Special Weather Statement	JAX	Clay	27 min
Sep 26, 10:22 PM EDT	Special Weather Statement	JAX	Marion	53 min
Sep 27, 4:33 PM EDT	Special Weather Statement	JAX	Baker	42 min
Sep 27, 7:51 PM EDT	Special Marine Warning	JAX		34 min
Sep 26, 8:23 PM EDT	Special Weather Statement	JAX	Coffee	37 min
Sep 26, 8:38 PM EDT	Areal Flood Advisory	JAX	Atkinson, Coffee	67 min
Sep 26, 9:18 PM EDT	Special Weather Statement	JAX	Clinch	42 min
Sep 26, 9:36 PM EDT	Areal Flood Advisory	JAX	Atkinson, Bacon, Clinch, Coffee, Ware	84 min
Sep 26, 9:55 PM EDT	Special Weather Statement	JAX	Ware	35 min
Sep 26, 10:29 PM EDT	Special Weather Statement	JAX	Bacon, Pierce, Ware	46 min
Sep 26, 11:19 PM EDT	Special Weather Statement	JAX	Brantley	41 min
Sep 27, 3:27 PM EDT	Special Weather Statement	JAX	Clinch, Echols	48 min
Sep 27, 4:42 PM EDT	Special Weather Statement	JAX	Jeff Davis	48 min
Sep 27, 4:48 PM EDT	Special Weather Statement	JAX	Jeff Davis	27 min
Sep 27, 6:37 PM EDT	Special Weather Statement	JAX	Coffee	53 min
Sep 27, 6:45 PM EDT	Special Weather Statement	JAX	Wayne	30 min
Sep 27, 7:00 PM EDT	Special Weather Statement	JAX	Brantley	30 min
Sep 27, 7:55 PM EDT	Special Weather Statement	JAX	Glynn	50 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.