Alert archive / Georgia / Mesoscale Discussions in 2008

Mesoscale Discussion 2140

August 23, 2008Henry County, Alabama; 15 counties in Florida; 56 counties in Georgia

The Storm Prediction Center issued this mesoscale discussion at Aug 23, 2008, 10:35 AM CDT for Henry County, Alabama; 15 counties in Florida; 56 counties in Georgia. It was in force for 115 min.

The area

The outline as issued.

The facts

Issued: Aug 23, 2008, 10:35 AM CDT (15:35 UTC)
Expired: Aug 23, 2008, 12:30 PM CDT
In force: 115 min
Issued by: the Storm Prediction Center

All 72 counties

Henry County, AL, Columbia County, FL, Dixie County, FL, Franklin County, FL, Gadsden County, FL, Gilchrist County, FL, Hamilton County, FL, Jefferson County, FL, Lafayette County, FL, Leon County, FL, Levy County, FL, Liberty County, FL, Madison County, FL, Suwannee County, FL, Taylor County, FL, Wakulla County, FL, Atkinson County, GA, Bacon County, GA, Baker County, GA, Ben Hill County, GA, Berrien County, GA, Bleckley County, GA, Brooks County, GA, Calhoun County, GA, Chattahoochee County, GA, Clay County, GA, Clinch County, GA, Coffee County, GA, Colquitt County, GA, Cook County, GA, Crawford County, GA, Crisp County, GA, Decatur County, GA, Dodge County, GA, Dooly County, GA, Dougherty County, GA, Early County, GA, Echols County, GA, Grady County, GA, Houston County, GA, Irwin County, GA, Jeff Davis County, GA, Lanier County, GA, Laurens County, GA, Lee County, GA, Lowndes County, GA, Macon County, GA, Marion County, GA, Miller County, GA, Mitchell County, GA, Muscogee County, GA, Peach County, GA, Pulaski County, GA, Quitman County, GA, Randolph County, GA, Schley County, GA, Seminole County, GA, Stewart County, GA, Sumter County, GA, Talbot County, GA, Taylor County, GA, Telfair County, GA, Terrell County, GA, Thomas County, GA, Tift County, GA, Turner County, GA, Upson County, GA, Ware County, GA, Webster County, GA, Wheeler County, GA, Wilcox County, GA, Worth County, GA

The radar

The Tallahassee radar (KTLH), 48 km from the middle of the area, began a volume at 15:35 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

Tallahassee Rgnl, FL (KTLH), launched 12:00Z, 3.6 hours before the alert went out and 46 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: 177 J/kg
Mixed-layer CIN: 0 J/kg
Mixed-layer LCL: 494 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 136 m²/s²
0-3 km storm-relative helicity: 142 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.2

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
Aug 23, 1:41 PM CDT	Mesoscale Discussion	SPC	Barbour, Henry, Russell	2 hr
Aug 22, 7:45 PM CDT	Mesoscale Discussion	SPC	Baker, Bradford, Clay, Columbia, Duval, Hamilton and 2 more	2 hr
Aug 23, 5:40 AM CDT	Mesoscale Discussion	SPC	Dixie, Lafayette, Levy, Taylor	2 hr
Aug 23, 6:18 AM CDT	Tornado Watch	SPC	Alachua, Citrus, Columbia, Dixie, Gilchrist, Hamilton and 10 more	8 hr
Aug 23, 4:24 PM CDT	Tornado Watch	SPC	Dixie, Gadsden, Jefferson, Lafayette, Leon, Madison and 2 more	6 hr

Nearby

Mesoscale Discussions in Georgia, 2008 Mesoscale Discussions in Florida, 2008 Mesoscale Discussions in Alabama, 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.