Alert archive / Georgia / Mesoscale Discussions in 2011

Mesoscale Discussion 450

April 16, 201118 counties in Georgia; 16 counties in South Carolina

The Storm Prediction Center issued this mesoscale discussion at Apr 16, 2011, 5:09 AM EDT for 18 counties in Georgia; 16 counties in South Carolina. It was in force for 96 min.

The area

The outline as issued.

The facts

Issued
Apr 16, 2011, 5:09 AM EDT (09:09 UTC)
Expired
Apr 16, 2011, 6:45 AM EDT
In force
96 min
Issued by
the Storm Prediction Center
All 34 counties

Clarke County, GA, Columbia County, GA, Elbert County, GA, Franklin County, GA, Glascock County, GA, Greene County, GA, Hancock County, GA, Hart County, GA, Lincoln County, GA, Madison County, GA, McDuffie County, GA, Morgan County, GA, Oconee County, GA, Oglethorpe County, GA, Richmond County, GA, Taliaferro County, GA, Warren County, GA, Wilkes County, GA, Abbeville County, SC, Aiken County, SC, Anderson County, SC, Chester County, SC, Edgefield County, SC, Fairfield County, SC, Greenwood County, SC, Kershaw County, SC, Lancaster County, SC, Laurens County, SC, Lexington County, SC, McCormick County, SC, Newberry County, SC, Richland County, SC, Saluda County, SC, Union County, SC

The radar

The Greer radar (KGSP), 96 km from the middle of the area, began a volume at 09:12 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 00:00Z, 9.2 hours before the alert went out and 211 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 00:00Z on 2011-04-16Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 406 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 00:00Z on 2011-04-16The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 373 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
406 J/kg
Mixed-layer CIN
-24 J/kg
Mixed-layer LCL
1138 m above ground
0-6 km bulk shear
68 kt
0-1 km storm-relative helicity
373 m²/s²
0-3 km storm-relative helicity
566 m²/s²
Significant tornado parameter
1.3
Supercell composite
11.3

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.

IssuedProductOfficeCountiesLasted
Apr 15, 8:52 PM EDTMesoscale DiscussionSPCBaldwin, Barrow, Bibb, Bleckley, Butts, Clarke and 40 more53 min
Apr 15, 9:12 PM EDTTornado WatchSPCBaldwin, Banks, Barrow, Bibb, Bleckley, Butts and 69 more9 hr
Apr 15, 11:41 PM EDTMesoscale DiscussionSPCBaldwin, Barrow, Bibb, Bleckley, Butts, Carroll and 59 more94 min
Apr 16, 2:43 AM EDTMesoscale DiscussionSPCBaker, Calhoun, Clay, Decatur, Dougherty, Early and 4 more92 min
Apr 16, 3:05 AM EDTTornado WatchSPCBaker, Ben Hill, Berrien, Brooks, Calhoun, Clay and 20 more7 hr
Apr 16, 5:57 AM EDTTornado WatchSPCBaldwin, Bibb, Bleckley, Bulloch, Burke, Butts and 56 more8 hr
Apr 16, 7:57 AM EDTMesoscale DiscussionSPCAtkinson, Bacon, Brantley, Camden, Charlton, Clinch and 10 more63 min
Apr 16, 10:39 AM EDTMesoscale DiscussionSPCBryan, Bulloch, Burke, Candler, Chatham, Effingham and 12 more2 hr
Apr 16, 12:02 PM EDTTornado Watch PDSSPCAllendale, Bamberg, Beaufort, Berkeley, Calhoun, Charleston and 20 more11 hr
Apr 16, 12:16 PM EDTMesoscale DiscussionSPCHorry59 min
Apr 16, 2:28 PM EDTMesoscale DiscussionSPCBeaufort, Berkeley, Calhoun, Charleston, Clarendon, Colleton and 13 more92 min
Apr 16, 4:49 PM EDTMesoscale DiscussionSPCBeaufort, Berkeley, Charleston, Colleton, Dillon, Dorchester and 6 more86 min
Apr 16, 6:59 PM EDTMesoscale DiscussionSPCCharleston, Georgetown, Horry91 min

Nearby

Mesoscale Discussions in Georgia, 2011Mesoscale Discussions in South Carolina, 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.