Alert archive / Georgia / Mesoscale Discussions in 2006

Mesoscale Discussion 559

April 19, 200613 counties in Georgia; Bradley County, Polk County, Tennessee

The Storm Prediction Center issued this mesoscale discussion at Apr 19, 2006, 8:58 AM EDT for 13 counties in Georgia; Bradley County, Polk County, Tennessee. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Apr 19, 2006, 8:58 AM EDT (12:58 UTC)
Expired: Apr 19, 2006, 11:00 AM EDT
In force: 2 hr
Issued by: the Storm Prediction Center

Counties Bartow County, GA, Catoosa County, GA, Cherokee County, GA, Cobb County, GA, Dawson County, GA, Fannin County, GA, Forsyth County, GA, Gilmer County, GA, Gordon County, GA, Murray County, GA, Pickens County, GA, Walker County, GA, Whitfield County, GA, Bradley County, TN, Polk County, TN

The radar

The Atlanta radar (KFFC), 122 km from the middle of the area, began a volume at 12:56 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.

Severe Thunderstorm Watch 208Apr 19, 11:00 AM EDT

The nearest sounding before it

Peachtre/Fal Fld, GA (KFFC), launched 12:00Z, 1.0 hours before the alert went out and 122 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: 373 J/kg
Mixed-layer CIN: -147 J/kg
Mixed-layer LCL: 584 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 12 m²/s²
0-3 km storm-relative helicity: 37 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

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.

Issued	Product	Office	Counties	Lasted
Apr 19, 10:59 AM EDT	Severe Thunderstorm Watch	SPC	Barrow, Bartow, Butts, Carroll, Chattooga, Cherokee and 35 more	6 hr
Apr 19, 12:56 PM EDT	Mesoscale Discussion	SPC	Appling, Atkinson, Bacon, Baldwin, Ben Hill, Berrien and 64 more	2 hr
Apr 19, 2:39 PM EDT	Mesoscale Discussion	SPC	Baldwin, Barrow, Bartow, Butts, Carroll, Chattooga and 35 more	96 min
Apr 19, 3:31 PM EDT	Mesoscale Discussion	SPC	Bibb, Carroll, Chattahoochee, Chattooga, Clayton, Coweta and 32 more	89 min
Apr 19, 3:54 PM EDT	Tornado Watch	SPC	Carroll, Chattahoochee, Coweta, Haralson, Harris, Heard and 13 more	6 hr
Apr 19, 4:40 PM EDT	Mesoscale Discussion	SPC	Appling, Atkinson, Bacon, Baker, Ben Hill, Berrien and 36 more	2 hr
Apr 19, 6:34 PM EDT	Severe Thunderstorm Watch	SPC	Atkinson, Baker, Ben Hill, Berrien, Brooks, Calhoun and 24 more	4 hr
Apr 19, 3:02 AM EDT	Mesoscale Discussion	SPC	Anderson, Blount, Campbell, Claiborne, Cocke, Grainger and 8 more	118 min
Apr 19, 3:39 AM EDT	Severe Thunderstorm Watch	SPC	Anderson, Blount, Campbell, Carter, Claiborne, Cocke and 14 more	7 hr
Apr 19, 5:12 AM EDT	Severe Thunderstorm Watch	SPC	Clay, Cumberland, Davidson, DeKalb, Fentress, Jackson and 11 more	4 hr
Apr 19, 7:28 AM EDT	Mesoscale Discussion	SPC	Anderson, Blount, Campbell, Carter, Claiborne, Clay and 24 more	62 min

Nearby

Mesoscale Discussions in Georgia, 2006 Mesoscale Discussions in Tennessee, 2006 Every mesoscale discussion in 2006

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.