Alert archive / Georgia / Mesoscale Discussions in 2011

Mesoscale Discussion 790

May 14, 201113 counties in Georgia; 13 counties in South Carolina

The Storm Prediction Center issued this mesoscale discussion at May 14, 2011, 6:44 PM EDT for 13 counties in Georgia; 13 counties in South Carolina. It was in force for 61 min.

The area

The outline as issued.

The facts

Issued: May 14, 2011, 6:44 PM EDT (22:44 UTC)
Expired: May 14, 2011, 7:45 PM EDT
In force: 61 min
Issued by: the Storm Prediction Center

All 26 counties

Bryan County, GA, Bulloch County, GA, Candler County, GA, Chatham County, GA, Effingham County, GA, Evans County, GA, Liberty County, GA, Long County, GA, McIntosh County, GA, Montgomery County, GA, Screven County, GA, Tattnall County, GA, Toombs County, GA, Allendale County, SC, Bamberg County, SC, Barnwell County, SC, Beaufort County, SC, Berkeley County, SC, Charleston County, SC, Colleton County, SC, Dorchester County, SC, Georgetown County, SC, Hampton County, SC, Jasper County, SC, Orangeburg County, SC, Williamsburg County, SC

The radar

The Charleston,SC radar (KCLX), 14 km from the middle of the area, began a volume at 22:48 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 nearest sounding before it

Charleston AFB, SC (KCHS), launched 12:00Z, 10.7 hours before the alert went out and 110 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: 1023 J/kg
Mixed-layer CIN: -58 J/kg
Mixed-layer LCL: 1115 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: -14 m²/s²
0-3 km storm-relative helicity: 39 m²/s²
Significant tornado parameter: -0.0
Supercell composite: -0.4

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
May 14, 4:30 PM EDT	Mesoscale Discussion	SPC	Bulloch, Burke, Candler, Columbia, Emanuel, Glascock and 14 more	30 min
May 14, 4:41 PM EDT	Severe Thunderstorm Watch	SPC	Bryan, Bulloch, Burke, Candler, Chatham, Columbia and 12 more	4 hr
May 14, 6:05 PM EDT	Mesoscale Discussion	SPC	Appling, Atkinson, Bacon, Clinch, Coffee, Echols and 5 more	55 min
May 13, 9:00 PM EDT	Mesoscale Discussion	SPC	Chester, Chesterfield, Lancaster, York	30 min
May 14, 1:02 PM EDT	Mesoscale Discussion	SPC	Dillon, Marion	118 min
May 14, 1:44 PM EDT	Severe Thunderstorm Watch	SPC	Darlington, Dillon, Florence, Horry, Marion, Marlboro	8 hr
May 14, 4:21 PM EDT	Mesoscale Discussion	SPC	Dillon, Marion, Marlboro	84 min
May 14, 7:32 PM EDT	Mesoscale Discussion	SPC	Darlington, Dillon, Florence, Marion, Marlboro	58 min

Nearby

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