Alert archive / Georgia / Mesoscale Discussions in 2008

Mesoscale Discussion 1865

July 22, 200821 counties in Georgia

The Storm Prediction Center issued this mesoscale discussion at Jul 22, 2008, 7:06 PM EDT for 21 counties in Georgia. It was in force for 84 min.

The area

The outline as issued.

The facts

Issued: Jul 22, 2008, 7:06 PM EDT (23:06 UTC)
Expired: Jul 22, 2008, 8:30 PM EDT
In force: 84 min
Issued by: the Storm Prediction Center

All 21 counties

Baldwin County, GA, Clarke County, GA, Emanuel County, GA, Glascock County, GA, Greene County, GA, Hancock County, GA, Jasper County, GA, Jefferson County, GA, Jenkins County, GA, Johnson County, GA, Jones County, GA, Morgan County, GA, Oconee County, GA, Oglethorpe County, GA, Putnam County, GA, Taliaferro County, GA, Treutlen County, GA, Warren County, GA, Washington County, GA, Wilkes County, GA, Wilkinson County, GA

The radar

The Robins AFB radar (KJGX), 84 km from the middle of the area, began a volume at 23:07 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, 11.1 hours before the alert went out and 139 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: 666 J/kg
Mixed-layer CIN: -270 J/kg
Mixed-layer LCL: 1062 m above ground
0-6 km bulk shear: 5 kt
0-1 km storm-relative helicity: 104 m²/s²
0-3 km storm-relative helicity: 239 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 22, 1:34 PM EDT	Severe Thunderstorm Watch	SPC	Catoosa, Chattooga, Dade, Fannin, Floyd, Gilmer and 4 more	6 hr
Jul 22, 3:57 PM EDT	Severe Thunderstorm Watch	SPC	Banks, Barrow, Bartow, Butts, Carroll, Chattahoochee and 56 more	7 hr
Jul 22, 4:02 PM EDT	Mesoscale Discussion	SPC	Baldwin, Banks, Barrow, Bartow, Bibb, Bleckley and 88 more	118 min

Nearby

Mesoscale Discussions in Georgia, 2008 Every mesoscale discussion in 2008

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.