Alert archive / Georgia / Mesoscale Discussions in 2018

Mesoscale Discussion 1693

December 2, 2018Leon County, Florida; 41 counties in Georgia; Beaufort County, Jasper County, South Carolina

The Storm Prediction Center issued this mesoscale discussion at Dec 2, 2018, 12:32 PM EST for Leon County, Florida; 41 counties in Georgia; Beaufort County, Jasper County, South Carolina. It was in force for 88 min.

The area

The outline as issued.

The facts

Issued: Dec 2, 2018, 12:32 PM EST (17:32 UTC)
Expired: Dec 2, 2018, 2:00 PM EST
In force: 88 min
Issued by: the Storm Prediction Center

All 44 counties

Leon County, FL, Appling County, GA, Atkinson County, GA, Bacon County, GA, Baker County, GA, Ben Hill County, GA, Berrien County, GA, Brantley County, GA, Brooks County, GA, Bryan County, GA, Bulloch County, GA, Chatham County, GA, Clinch County, GA, Coffee County, GA, Colquitt County, GA, Cook County, GA, Decatur County, GA, Dougherty County, GA, Effingham County, GA, Evans County, GA, Glynn County, GA, Grady County, GA, Irwin County, GA, Jeff Davis County, GA, Lanier County, GA, Liberty County, GA, Long County, GA, Lowndes County, GA, McIntosh County, GA, Mitchell County, GA, Montgomery County, GA, Pierce County, GA, Tattnall County, GA, Telfair County, GA, Thomas County, GA, Tift County, GA, Toombs County, GA, Turner County, GA, Ware County, GA, Wayne County, GA, Wheeler County, GA, Worth County, GA, Beaufort County, SC, Jasper County, SC

The radar

The Moody AFB radar (KVAX), 73 km from the middle of the area, began a volume at 17:32 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, 5.5 hours before the alert went out and 162 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: 1274 J/kg
Mixed-layer CIN: -40 J/kg
Mixed-layer LCL: 520 m above ground
0-6 km bulk shear: 48 kt
0-1 km storm-relative helicity: 294 m²/s²
0-3 km storm-relative helicity: 302 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 5.9

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Dec 1, 10:18 PM EST	Mesoscale Discussion	SPC	Calhoun, Gadsden, Holmes, Jackson, Jefferson, Leon and 5 more	87 min
Dec 2, 12:27 AM EST	Mesoscale Discussion	SPC	Holmes	93 min
Dec 2, 3:03 AM EST	Mesoscale Discussion	SPC	Gadsden, Holmes, Jackson, Leon, Washington	2 hr
Dec 2, 7:00 AM EST	Mesoscale Discussion	SPC	Jackson	2 hr
Dec 2, 3:48 AM EST	Tornado Watch	SPC	Baker, Ben Hill, Berrien, Brooks, Calhoun, Clay and 32 more	7 hr
Dec 2, 10:00 AM EST	Tornado Watch	SPC	Appling, Atkinson, Bacon, Ben Hill, Berrien, Brantley and 38 more	8 hr

Nearby

Mesoscale Discussions in Georgia, 2018 Mesoscale Discussions in South Carolina, 2018 Mesoscale Discussions in Florida, 2018 Every mesoscale discussion 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.