Alert archive / Georgia / Mesoscale Discussions in 2011

Mesoscale Discussion 1276

June 18, 20115 states

The Storm Prediction Center issued this mesoscale discussion at Jun 18, 2011, 2:21 PM EDT for 5 states. It was in force for 84 min.

The area

The outline as issued.

The facts

Issued
Jun 18, 2011, 2:21 PM EDT (18:21 UTC)
Expired
Jun 18, 2011, 3:45 PM EDT
In force
84 min
Issued by
the Storm Prediction Center
All 66 counties

Banks County, GA, Bartow County, GA, Catoosa County, GA, Chattooga County, GA, Cherokee County, GA, Dawson County, GA, Fannin County, GA, Floyd County, GA, Forsyth County, GA, Franklin County, GA, Gilmer County, GA, Gordon County, GA, Habersham County, GA, Hall County, GA, Hart County, GA, Jackson County, GA, Lumpkin County, GA, Murray County, GA, Pickens County, GA, Rabun County, GA, Stephens County, GA, Towns County, GA, Union County, GA, Walker County, GA, White County, GA, Whitfield County, GA, Alexander County, NC, Alleghany County, NC, Ashe County, NC, Burke County, NC, Caldwell County, NC, Catawba County, NC, Cherokee County, NC, Clay County, NC, Cleveland County, NC, Davie County, NC, Gaston County, NC, Henderson County, NC, Iredell County, NC, Jackson County, NC, Lincoln County, NC, Macon County, NC, McDowell County, NC, Polk County, NC, Rutherford County, NC, Surry County, NC, Transylvania County, NC, Watauga County, NC, Wilkes County, NC, Yadkin County, NC, Anderson County, SC, Cherokee County, SC, Greenville County, SC, Oconee County, SC, Pickens County, SC, Spartanburg County, SC, Bradley County, TN, Hamilton County, TN, Polk County, TN, Carroll County, VA, City of Galax, VA, Floyd County, VA, Grayson County, VA, Patrick County, VA, Pulaski County, VA, Wythe County, VA

The radar

The Knoxville radar (KMRX), 86 km from the middle of the area, began a volume at 18:21 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, 6.4 hours before the alert went out and 264 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 2011-06-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1149 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 2011-06-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 23 square meters per square second.1939Sfc1 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
1149 J/kg
Mixed-layer CIN
-132 J/kg
Mixed-layer LCL
704 m above ground
0-6 km bulk shear
8 kt
0-1 km storm-relative helicity
23 m²/s²
0-3 km storm-relative helicity
33 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
Jun 18, 9:38 AM EDTMesoscale DiscussionSPCBanks, Bartow, Catoosa, Chattooga, Cherokee, Cobb and 22 more97 min
Jun 18, 11:05 AM EDTSevere Thunderstorm WatchSPCBanks, Bartow, Catoosa, Chattooga, Cherokee, Dade and 20 more9 hr
Jun 18, 3:55 PM EDTMesoscale DiscussionSPCBarrow, Carroll, Clarke, Clayton, Cobb, Columbia and 25 more35 min
Jun 18, 4:08 PM EDTSevere Thunderstorm WatchSPCBaldwin, Barrow, Burke, Butts, Carroll, Clarke and 51 more6 hr
Jun 18, 6:49 PM EDTMesoscale DiscussionSPCBaldwin, Barrow, Bibb, Bleckley, Bulloch, Burke and 55 more86 min
Jun 18, 7:20 PM EDTSevere Thunderstorm WatchSPCBryan, Bulloch, Candler, Chatham, Effingham, Evans and 6 more5 hr
Jun 18, 3:38 PM EDTSevere Thunderstorm WatchSPCAlamance, Anson, Caswell, Chatham, Davidson, Durham and 17 more4 hr
Jun 18, 5:46 PM EDTMesoscale DiscussionSPCAlamance, Anson, Caswell, Chatham, Cumberland, Durham and 19 more59 min
Jun 18, 10:39 AM EDTSevere Thunderstorm WatchSPCBedford, Benton, Carroll, Chester, Coffee, Crockett and 30 more7 hr

Nearby

Mesoscale Discussions in Georgia, 2011Mesoscale Discussions in North Carolina, 2011Mesoscale Discussions in Virginia, 2011Every mesoscale discussion in 2011

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.