Alert archive / Georgia / Mesoscale Discussions in 2009

Mesoscale Discussion 2188

December 2, 200929 counties in Georgia; 11 counties in South Carolina

The Storm Prediction Center issued this mesoscale discussion at Dec 2, 2009, 1:31 PM EST for 29 counties in Georgia; 11 counties in South Carolina. It was in force for 89 min.

The area

The outline as issued.

The facts

Issued
Dec 2, 2009, 1:31 PM EST (18:31 UTC)
Expired
Dec 2, 2009, 3:00 PM EST
In force
89 min
Issued by
the Storm Prediction Center
All 40 counties

Baldwin County, GA, Bleckley County, GA, Bryan County, GA, Bulloch County, GA, Burke County, GA, Candler County, GA, Dodge County, GA, Effingham County, GA, Emanuel County, GA, Evans County, GA, Glascock County, GA, Hancock County, GA, Jeff Davis County, GA, Jefferson County, GA, Jenkins County, GA, Johnson County, GA, Jones County, GA, Laurens County, GA, Montgomery County, GA, Richmond County, GA, Screven County, GA, Tattnall County, GA, Telfair County, GA, Toombs County, GA, Treutlen County, GA, Twiggs County, GA, Washington County, GA, Wheeler County, GA, Wilkinson County, GA, Aiken County, SC, Allendale County, SC, Bamberg County, SC, Barnwell County, SC, Beaufort 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), 71 km from the middle of the area, began a volume at 18:35 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.

The nearest sounding before it

Charleston AFB, SC (KCHS), launched 12:00Z, 6.5 hours before the alert went out and 167 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-pSkew-T log-p diagram, Charleston AFB, SC at 12:00Z on 2009-12-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Charleston AFB, SC at 12:00Z on 2009-12-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 368 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
438 m above ground
0-6 km bulk shear
66 kt
0-1 km storm-relative helicity
368 m²/s²
0-3 km storm-relative helicity
626 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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.

IssuedProductOfficeCountiesLasted
Dec 2, 4:11 AM ESTTornado WatchSPCBaker, Calhoun, Clay, Decatur, Dougherty, Early and 8 more6 hr
Dec 2, 6:02 AM ESTMesoscale DiscussionSPCBaker, Calhoun, Clay, Decatur, Dougherty, Early and 8 more58 min
Dec 2, 9:52 AM ESTMesoscale DiscussionSPCAppling, Atkinson, Bacon, Ben Hill, Berrien, Brantley and 37 more83 min
Dec 2, 10:32 AM ESTTornado WatchSPCAppling, Atkinson, Bacon, Baker, Baldwin, Ben Hill and 59 more6 hr
Dec 2, 12:48 PM ESTMesoscale DiscussionSPCAppling, Atkinson, Bacon, Ben Hill, Berrien, Brantley and 37 more117 min
Dec 2, 2:08 PM ESTTornado WatchSPCBryan, Bulloch, Burke, Candler, Chatham, Columbia and 11 more8 hr
Dec 2, 2:46 PM ESTTornado WatchSPCAppling, Bacon, Brantley, Camden, Charlton, Clinch and 5 more7 hr
Dec 2, 5:44 PM ESTMesoscale DiscussionSPCBryan, Bulloch, Burke, Candler, Chatham, Columbia and 11 more91 min
Dec 2, 6:39 PM ESTMesoscale DiscussionSPCBrantley, Camden, Charlton, Glynn, Pierce, Wayne96 min
Dec 2, 6:59 PM ESTTornado Watch PDSSPCDarlington, Dillon, Florence, Georgetown, Horry, Marion and 2 more8 hr

Nearby

Mesoscale Discussions in Georgia, 2009Mesoscale Discussions in South Carolina, 2009Every 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.