Alert archive / Georgia / Severe Thunderstorm Warnings in 2014

Severe Thunderstorm Warning 202, NWS Jacksonville, FL

September 17, 2014Glynn County, Georgia

NWS Jacksonville, FL issued this severe thunderstorm warning at Sep 17, 2014, 4:41 PM EDT for Glynn County, Georgia. It was in force for 49 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 17, 2014, 4:41 PM EDT (20:41 UTC)
Expired: Sep 17, 2014, 5:30 PM EDT
In force: 49 min
Issued by: NWS Jacksonville, FL
Area: Storm-based polygon

County Glynn County, GA

The radar

The Jacksonville radar (KJAX), 83 km from the middle of the area, began a volume at 20:43 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, 8.7 hours before the alert went out and 235 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: 886 J/kg
Mixed-layer CIN: -38 J/kg
Mixed-layer LCL: 584 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: -8 m²/s²
0-3 km storm-relative helicity: -20 m²/s²
Significant tornado parameter: -0.0
Supercell composite: -0.3

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 17, 3:05 PM EDT, 1 hour 36 minutes earlier.

Area forecast discussion, Sep 17, 3:05 PM EDT, 1 hour 36 minutes before

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Hazardous weather outlook, Sep 17, 2:55 PM EDT, 1 hour 46 minutes before

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In the hours before

Special weather statement, Sep 17, 4:31 PM EDT, 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
Sep 16, 9:14 PM EDT	Areal Flood Advisory	JAX	Suwannee	2 hr
Sep 17, 2:56 AM EDT	Rip Current Statement	JAX	Flagler, Nassau	17 hr
Sep 16, 8:38 PM EDT	Special Weather Statement	JAX	Clinch	22 min
Sep 17, 4:31 PM EDT	Special Weather Statement	JAX	Glynn	29 min
Sep 17, 5:09 PM EDT	Areal Flood Advisory	JAX	Glynn	2 hr

Nearby

Severe Thunderstorm Warnings in Georgia, 2014 Every severe thunderstorm warning in 2014

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.