Alert archive / Georgia / Mesoscale Discussions in 2007

Mesoscale Discussion 2275

December 30, 20074 states

The Storm Prediction Center issued this mesoscale discussion at Dec 30, 2007, 1:15 PM EST for 4 states. It was in force for 90 min.

The area

The outline as issued.

The facts

Issued: Dec 30, 2007, 1:15 PM EST (18:15 UTC)
Expired: Dec 30, 2007, 2:45 PM EST
In force: 90 min
Issued by: the Storm Prediction Center

All 40 counties

Jefferson County, FL, Leon County, FL, Madison County, FL, Appling County, GA, Atkinson County, GA, Bacon County, GA, Berrien County, GA, Brooks County, GA, Bryan County, GA, Bulloch County, GA, Clinch County, GA, Coffee County, GA, Cook County, GA, Echols County, GA, Effingham County, GA, Evans County, GA, Lanier County, GA, Liberty County, GA, Long County, GA, Lowndes County, GA, Pierce County, GA, Tattnall County, GA, Thomas County, GA, Ware County, GA, Wayne County, GA, Bladen County, NC, Columbus County, NC, Robeson County, NC, Beaufort County, SC, Berkeley County, SC, Clarendon County, SC, Colleton County, SC, Dillon County, SC, Dorchester County, SC, Florence County, SC, Hampton County, SC, Horry County, SC, Jasper County, SC, Marion County, SC, Williamsburg County, SC

The radar

The Charleston,SC radar (KCLX), 61 km from the middle of the area, began a volume at 18:17 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, 6.3 hours before the alert went out and 156 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: 457 J/kg
Mixed-layer CIN: -25 J/kg
Mixed-layer LCL: 529 m above ground
0-6 km bulk shear: 59 kt
0-1 km storm-relative helicity: 145 m²/s²
0-3 km storm-relative helicity: 156 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.3

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Dec 30, 2:34 AM EST	Mesoscale Discussion	SPC	Escambia, Okaloosa, Santa Rosa	86 min
Dec 30, 8:25 AM EST	Mesoscale Discussion	SPC	Bay, Calhoun, Gadsden, Gulf, Holmes, Jackson and 4 more	95 min
Dec 30, 4:07 PM EST	Mesoscale Discussion	SPC	Nassau	53 min

Nearby

Mesoscale Discussions in Georgia, 2007 Mesoscale Discussions in South Carolina, 2007 Mesoscale Discussions in Florida, 2007 Every mesoscale discussion in 2007

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.