Alert archive / Georgia / Mesoscale Discussions in 2013

Mesoscale Discussion 102

January 30, 201338 counties in Georgia; Gaston County, Mecklenburg County, North Carolina; 13 counties in South Carolina

The Storm Prediction Center issued this mesoscale discussion at Jan 30, 2013, 4:13 PM EST for 38 counties in Georgia; Gaston County, Mecklenburg County, North Carolina; 13 counties in South Carolina. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Jan 30, 2013, 4:13 PM EST (21:13 UTC)
Expired
Jan 30, 2013, 6:15 PM EST
In force
2 hr
Issued by
the Storm Prediction Center
All 53 counties

Baldwin County, GA, Bibb County, GA, Bleckley County, GA, Colquitt County, GA, Columbia County, GA, Crisp County, GA, Dodge County, GA, Dooly County, GA, Dougherty County, GA, Elbert County, GA, Glascock County, GA, Greene County, GA, Hancock County, GA, Houston County, GA, Jefferson County, GA, Johnson County, GA, Jones County, GA, Laurens County, GA, Lee County, GA, Lincoln County, GA, McDuffie County, GA, Mitchell County, GA, Oglethorpe County, GA, Peach County, GA, Pulaski County, GA, Putnam County, GA, Richmond County, GA, Taliaferro County, GA, Tift County, GA, Treutlen County, GA, Turner County, GA, Twiggs County, GA, Warren County, GA, Washington County, GA, Wilcox County, GA, Wilkes County, GA, Wilkinson County, GA, Worth County, GA, Gaston County, NC, Mecklenburg County, NC, Abbeville County, SC, Cherokee County, SC, Chester County, SC, Edgefield County, SC, Fairfield County, SC, Greenwood County, SC, Laurens County, SC, McCormick County, SC, Newberry County, SC, Saluda County, SC, Spartanburg County, SC, Union County, SC, York County, SC

The radar

The Robins AFB radar (KJGX), 62 km from the middle of the area, began a volume at 21:14 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

Peachtre/Fal Fld, GA (KFFC), launched 12:00Z, 9.2 hours before the alert went out and 160 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, Peachtre/Fal Fld, GA at 12:00Z on 2013-01-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 220 joules per kilogram.LCLLFCEL10008507005003002001001 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, Peachtre/Fal Fld, GA at 12:00Z on 2013-01-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 343 square meters per square second.1939587897117Sfc1 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
220 J/kg
Mixed-layer CIN
-1 J/kg
Mixed-layer LCL
487 m above ground
0-6 km bulk shear
50 kt
0-1 km storm-relative helicity
343 m²/s²
0-3 km storm-relative helicity
420 m²/s²
Significant tornado parameter
0.4
Supercell composite
1.8

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
Jan 30, 5:51 AM ESTTornado WatchSPCBartow, Carroll, Catoosa, Chattooga, Dade, Floyd and 8 more7 hr
Jan 30, 7:38 AM ESTMesoscale DiscussionSPCBartow, Carroll, Catoosa, Chattooga, Dade, Floyd and 7 more97 min
Jan 30, 8:11 AM ESTTornado WatchSPCBaldwin, Banks, Barrow, Bartow, Bibb, Bleckley and 81 more7 hr
Jan 30, 11:09 AM ESTMesoscale DiscussionSPCBartow, Carroll, Cherokee, Clayton, Cobb, Coweta and 18 more96 min
Jan 30, 12:50 PM ESTMesoscale DiscussionSPCBaldwin, Banks, Barrow, Bartow, Bibb, Butts and 63 more85 min
Jan 30, 1:19 PM ESTTornado WatchSPCBaker, Baldwin, Banks, Barrow, Bartow, Bibb and 91 more9 hr
Jan 30, 5:31 PM ESTMesoscale DiscussionSPCAppling, Atkinson, Bacon, Ben Hill, Berrien, Brooks and 34 more59 min
Jan 30, 5:45 PM ESTTornado WatchSPCAppling, Atkinson, Bacon, Baker, Baldwin, Ben Hill and 71 more6 hr
Jan 30, 3:21 PM ESTMesoscale DiscussionSPCAlleghany, Rockingham, Stokes, Surry, Wilkes, Yadkin84 min
Jan 30, 3:42 PM ESTSevere Thunderstorm WatchSPCAlleghany, Ashe, Caswell, Rockingham, Stokes, Surry and 3 more5 hr
Jan 30, 4:06 PM ESTMesoscale DiscussionSPCAlamance, Chatham, Davidson, Durham, Franklin, Granville and 6 more114 min

Nearby

Mesoscale Discussions in Georgia, 2013Mesoscale Discussions in South Carolina, 2013Mesoscale Discussions in North Carolina, 2013Every mesoscale discussion in 2013

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.