Alert archive / Georgia / Mesoscale Discussions in 2005

Mesoscale Discussion 668

April 22, 20054 counties in Georgia

The Storm Prediction Center issued this mesoscale discussion at Apr 22, 2005, 10:43 PM EDT for 4 counties in Georgia. It was in force for 62 min.

The area

The outline as issued.

The facts

Issued: Apr 22, 2005, 10:43 PM EDT (02:43 UTC)
Expired: Apr 22, 2005, 11:45 PM EDT
In force: 62 min
Issued by: the Storm Prediction Center

Counties Cobb County, GA, Forsyth County, GA, Paulding County, GA, Polk County, GA

The radar

The Atlanta radar (KFFC), 73 km from the middle of the area, began a volume at 02:44 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 00:00Z, 2.7 hours before the alert went out and 73 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: 485 J/kg
Mixed-layer CIN: -83 J/kg
Mixed-layer LCL: 987 m above ground
0-6 km bulk shear: 48 kt
0-1 km storm-relative helicity: 283 m²/s²
0-3 km storm-relative helicity: 272 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 3.3

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 22, 9:50 PM EDT	Severe Thunderstorm Watch	SPC	Carroll, Chattahoochee, Coweta, Douglas, Fayette, Haralson and 10 more	5 hr
Apr 22, 10:15 PM EDT	Mesoscale Discussion	SPC	Brantley, Camden, Charlton, Glynn, McIntosh, Pierce	60 min
Apr 22, 11:01 PM EDT	Mesoscale Discussion	SPC	Atkinson, Baker, Berrien, Brooks, Calhoun, Charlton and 23 more	89 min
Apr 23, 12:14 AM EDT	Mesoscale Discussion	SPC	Carroll, Clayton, Coweta, Douglas, Fayette, Fulton and 7 more	91 min
Apr 23, 12:15 AM EDT	Severe Thunderstorm Watch	SPC	Decatur, Echols	4 hr

Nearby

Mesoscale Discussions in Georgia, 2005 Every mesoscale discussion in 2005

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.