Alert archive / Georgia / Mesoscale Discussions in 2015

Mesoscale Discussion 375

April 19, 201517 counties in Georgia

The Storm Prediction Center issued this mesoscale discussion at Apr 19, 2015, 10:40 AM EDT for 17 counties in Georgia. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Apr 19, 2015, 10:40 AM EDT (14:40 UTC)
Expired: Apr 19, 2015, 12:45 PM EDT
In force: 2 hr
Issued by: the Storm Prediction Center

Counties Bleckley County, GA, Calhoun County, GA, Crisp County, GA, Dodge County, GA, Dooly County, GA, Dougherty County, GA, Lee County, GA, Macon County, GA, Pulaski County, GA, Randolph County, GA, Schley County, GA, Stewart County, GA, Sumter County, GA, Terrell County, GA, Turner County, GA, Webster County, GA, Wilcox County, GA

The radar

The Robins AFB radar (KJGX), 109 km from the middle of the area, began a volume at 14:42 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

Peachtre/Fal Fld, GA (KFFC), launched 12:00Z, 2.7 hours before the alert went out and 162 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: 239 J/kg
Mixed-layer CIN: -9 J/kg
Mixed-layer LCL: 617 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 207 m²/s²
0-3 km storm-relative helicity: 329 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 0.9

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
Apr 19, 6:51 AM EDT	Mesoscale Discussion	SPC	Baker, Calhoun, Chattahoochee, Clay, Decatur, Early and 11 more	114 min
Apr 19, 7:57 AM EDT	Tornado Watch	SPC	Baker, Baldwin, Banks, Barrow, Bartow, Ben Hill and 97 more	7 hr
Apr 19, 12:24 PM EDT	Mesoscale Discussion	SPC	Appling, Atkinson, Bacon, Ben Hill, Berrien, Brantley and 46 more	2 hr
Apr 19, 1:04 PM EDT	Tornado Watch	SPC	Appling, Atkinson, Bacon, Brantley, Bryan, Bulloch and 33 more	7 hr
Apr 19, 2:14 PM EDT	Mesoscale Discussion	SPC	Bartow, Carroll, Catoosa, Chattooga, Dade, Douglas and 8 more	2 hr
Apr 19, 6:25 PM EDT	Mesoscale Discussion	SPC	Bartow, Carroll, Catoosa, Chattooga, Cherokee, Cobb and 16 more	95 min

Nearby

Mesoscale Discussions in Georgia, 2015 Every mesoscale discussion in 2015

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.