Alert archive / Georgia / Mesoscale Discussions in 2014

Mesoscale Discussion 1499

July 28, 201415 counties in Georgia; Beaufort County, Charleston County, Jasper County, South Carolina

The Storm Prediction Center issued this mesoscale discussion at Jul 28, 2014, 7:36 PM EDT for 15 counties in Georgia; Beaufort County, Charleston County, Jasper County, South Carolina. It was in force for 84 min.

The area

The outline as issued.

The facts

Issued: Jul 28, 2014, 7:36 PM EDT (23:36 UTC)
Expired: Jul 28, 2014, 9:00 PM EDT
In force: 84 min
Issued by: the Storm Prediction Center

Counties Bulloch County, GA, Candler County, GA, Dodge County, GA, Dooly County, GA, Effingham County, GA, Evans County, GA, Montgomery County, GA, Pulaski County, GA, Sumter County, GA, Telfair County, GA, Toombs County, GA, Treutlen County, GA, Webster County, GA, Wheeler County, GA, Wilcox County, GA, Beaufort County, SC, Charleston County, SC, Jasper County, SC

The radar

The Charleston,SC radar (KCLX), 101 km from the middle of the area, began a volume at 23:39 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, 11.6 hours before the alert went out and 202 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: 1077 J/kg
Mixed-layer CIN: -143 J/kg
Mixed-layer LCL: 1256 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 97 m²/s²
0-3 km storm-relative helicity: 106 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 1.2

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
Jul 28, 12:32 AM EDT	Mesoscale Discussion	SPC	Banks, Dawson, Elbert, Fannin, Forsyth, Franklin and 12 more	88 min
Jul 28, 2:27 PM EDT	Mesoscale Discussion	SPC	Baldwin, Ben Hill, Bibb, Bleckley, Bryan, Bulloch and 52 more	93 min
Jul 28, 3:25 PM EDT	Severe Thunderstorm Watch	SPC	Appling, Bacon, Baker, Ben Hill, Berrien, Bleckley and 57 more	6 hr

Nearby

Mesoscale Discussions in Georgia, 2014 Mesoscale Discussions in South Carolina, 2014 Every mesoscale discussion in 2014

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.