Alert archive / Georgia / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 110, NWS Charleston, SC

December 17, 2019Tattnall County, Georgia

NWS Charleston, SC issued this severe thunderstorm warning at Dec 17, 2019, 1:22 PM EST for Tattnall County, Georgia. It was in force for 53 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 17, 2019, 1:22 PM EST (18:22 UTC)
Expired: Dec 17, 2019, 2:15 PM EST
In force: 53 min
Issued by: NWS Charleston, SC
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

County Tattnall County, GA

The radar

The Charleston,SC radar (KCLX), 117 km from the middle of the area, began a volume at 18:22 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
Dec 17, 11:58 AM EST	Tornado Watch	SPC	5 hr

The nearest sounding before it

Jacksonville, FL (KJAX), launched 12:00Z, 6.4 hours before the alert went out and 175 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: 845 J/kg
Mixed-layer CIN: -21 J/kg
Mixed-layer LCL: 606 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 193 m²/s²
0-3 km storm-relative helicity: 197 m²/s²
Significant tornado parameter: 0.9
Supercell composite: 6.4

Open this sounding in Storm Lab

The office that day

Everything else NWS Charleston, SC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Dec 17, 3:30 AM EST	Small Craft Advisory	CHS		10 days
Dec 17, 7:21 AM EST	Marine Dense Fog Advisory	CHS		15 hr
Dec 17, 3:18 PM EST	Special Weather Statement	CHS	Beaufort	27 min
Dec 17, 3:45 PM EST	Lake Wind Advisory	CHS	Berkeley	18 hr
Dec 17, 4:03 PM EST	Special Marine Warning	CHS		42 min
Dec 17, 4:43 PM EST	Special Marine Warning	CHS		92 min
Dec 17, 9:38 AM EST	River Flood Warning	CHS	Tattnall, Toombs	35 days
Dec 17, 3:39 PM EST	Special Weather Statement	CHS	McIntosh	51 min
Dec 17, 4:33 PM EST	Special Weather Statement	CHS	McIntosh	12 min

Nearby

Severe Thunderstorm Warnings in Georgia, 2019 Every severe thunderstorm warning in 2019

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.