Alert archive / Georgia / Mesoscale Discussions in 2007

Mesoscale Discussion 1552

July 20, 200740 counties in Georgia

The Storm Prediction Center issued this mesoscale discussion at Jul 20, 2007, 1:11 PM EDT for 40 counties in Georgia. It was in force for 94 min.

The area

The outline as issued.

The facts

Issued: Jul 20, 2007, 1:11 PM EDT (17:11 UTC)
Expired: Jul 20, 2007, 2:45 PM EDT
In force: 94 min
Issued by: the Storm Prediction Center

All 40 counties

Baldwin County, GA, Ben Hill County, GA, Bibb County, GA, Bleckley County, GA, Butts County, GA, Crawford County, GA, Crisp County, GA, DeKalb County, GA, Dodge County, GA, Dooly County, GA, Emanuel County, GA, Glascock County, GA, Greene County, GA, Hancock County, GA, Henry County, GA, Houston County, GA, Jasper County, GA, Jefferson County, GA, Johnson County, GA, Jones County, GA, Lamar County, GA, Laurens County, GA, Monroe County, GA, Montgomery County, GA, Morgan County, GA, Newton County, GA, Peach County, GA, Pulaski County, GA, Putnam County, GA, Rockdale County, GA, Taliaferro County, GA, Telfair County, GA, Treutlen County, GA, Twiggs County, GA, Walton County, GA, Warren County, GA, Washington County, GA, Wheeler County, GA, Wilcox County, GA, Wilkinson County, GA

The radar

The Robins AFB radar (KJGX), 14 km from the middle of the area, began a volume at 17:11 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.

The nearest sounding before it

Peachtre/Fal Fld, GA (KFFC), launched 12:00Z, 5.2 hours before the alert went out and 135 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: 652 J/kg
Mixed-layer CIN: -112 J/kg
Mixed-layer LCL: 992 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: 25 m²/s²
0-3 km storm-relative helicity: 42 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 20, 11:02 AM EDT	Mesoscale Discussion	SPC	Bartow, Carroll, Cherokee, Clayton, Cobb, Coweta and 9 more	88 min
Jul 20, 11:21 AM EDT	Severe Thunderstorm Watch	SPC	Bartow, Carroll, Chattahoochee, Chattooga, Cobb, Coweta and 22 more	8 hr
Jul 20, 1:47 PM EDT	Severe Thunderstorm Watch	SPC	Appling, Atkinson, Bacon, Baker, Baldwin, Ben Hill and 46 more	6 hr
Jul 20, 1:52 PM EDT	Mesoscale Discussion	SPC	Burke, Columbia, Glascock, Jefferson, Jenkins, Lincoln and 5 more	83 min
Jul 20, 3:02 PM EDT	Severe Thunderstorm Watch	SPC	Brantley, Bryan, Bulloch, Burke, Candler, Chatham and 15 more	7 hr
Jul 20, 3:55 PM EDT	Mesoscale Discussion	SPC	Appling, Atkinson, Bacon, Baker, Baldwin, Ben Hill and 71 more	2 hr
Jul 20, 7:34 PM EDT	Mesoscale Discussion	SPC	Brantley, Camden, Charlton, Chatham, Glynn, Liberty and 4 more	56 min

Nearby

Mesoscale Discussions in Georgia, 2007 Every mesoscale discussion in 2007

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.