Alert archive / Georgia / Mesoscale Discussions in 2009

Mesoscale Discussion 2296

December 25, 200930 counties in Georgia; 11 counties in South Carolina

The Storm Prediction Center issued this mesoscale discussion at Dec 25, 2009, 4:41 AM EST for 30 counties in Georgia; 11 counties in South Carolina. It was in force for 64 min.

The area

The outline as issued.

The facts

Issued: Dec 25, 2009, 4:41 AM EST (09:41 UTC)
Expired: Dec 25, 2009, 5:45 AM EST
In force: 64 min
Issued by: the Storm Prediction Center

All 41 counties

Appling County, GA, Bryan County, GA, Bulloch County, GA, Burke County, GA, Camden County, GA, Candler County, GA, Chatham County, GA, Dodge County, GA, Effingham County, GA, Emanuel County, GA, Evans County, GA, Glynn County, GA, Jeff Davis County, GA, Jefferson County, GA, Jenkins County, GA, Johnson County, GA, Laurens County, GA, Liberty County, GA, Long County, GA, McIntosh County, GA, Montgomery County, GA, Screven County, GA, Tattnall County, GA, Telfair County, GA, Toombs County, GA, Treutlen County, GA, Washington County, GA, Wayne County, GA, Wheeler County, GA, Wilkinson County, GA, Allendale County, SC, Bamberg County, SC, Barnwell County, SC, Beaufort County, SC, Berkeley County, SC, Calhoun County, SC, Colleton County, SC, Dorchester County, SC, Hampton County, SC, Jasper County, SC, Orangeburg County, SC

The radar

The Charleston,SC radar (KCLX), 86 km from the middle of the area, began a volume at 09:43 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

Tornado Watch 811Dec 25, 5:00 AM EST

The nearest sounding before it

Jacksonville, FL (KJAX), launched 00:00Z, 9.7 hours before the alert went out and 220 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: 103 J/kg
Mixed-layer CIN: -12 J/kg
Mixed-layer LCL: 860 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 102 m²/s²
0-3 km storm-relative helicity: 215 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

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 24, 10:45 PM EST	Mesoscale Discussion	SPC	Decatur, Seminole	2 hr
Dec 25, 3:27 AM EST	Mesoscale Discussion	SPC	Atkinson, Berrien, Brooks, Clinch, Coffee, Cook and 5 more	63 min
Dec 25, 3:46 AM EST	Tornado Watch	SPC	Appling, Atkinson, Bacon, Berrien, Brantley, Brooks and 13 more	7 hr
Dec 25, 5:01 AM EST	Tornado Watch	SPC	Bryan, Bulloch, Burke, Candler, Chatham, Dodge and 20 more	9 hr
Dec 25, 7:27 AM EST	Mesoscale Discussion	SPC	Appling, Atkinson, Bacon, Brantley, Bryan, Bulloch and 27 more	93 min
Dec 25, 10:26 AM EST	Mesoscale Discussion	SPC	Appling, Bacon, Brantley, Camden, Charlton, Glynn and 3 more	64 min
Dec 25, 11:39 AM EST	Mesoscale Discussion	SPC	Bryan, Chatham, Effingham, Liberty, McIntosh	66 min

Nearby

Mesoscale Discussions in Georgia, 2009 Mesoscale Discussions in South Carolina, 2009 Every mesoscale discussion in 2009

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.