Alert archive / Georgia / Mesoscale Discussions in 2008

Mesoscale Discussion 263

February 17, 20084 states

The Storm Prediction Center issued this mesoscale discussion at Feb 17, 2008, 7:34 PM CST for 4 states. It was in force for 56 min.

The area

The outline as issued.

The facts

Issued
Feb 17, 2008, 7:34 PM CST (01:34 UTC)
Expired
Feb 17, 2008, 8:30 PM CST
In force
56 min
Issued by
the Storm Prediction Center
All 78 counties

Geneva County, AL, Henry County, AL, Houston County, AL, Bay County, FL, Calhoun County, FL, Franklin County, FL, Gadsden County, FL, Gulf County, FL, Holmes County, FL, Jackson County, FL, Jefferson County, FL, Leon County, FL, Liberty County, FL, Madison County, FL, Taylor County, FL, Wakulla County, FL, Walton County, FL, Washington County, FL, Atkinson County, GA, Baker County, GA, Ben Hill County, GA, Berrien County, GA, Brooks County, GA, Burke County, GA, Calhoun County, GA, Candler County, GA, Clay County, GA, Coffee County, GA, Colquitt County, GA, Columbia County, GA, Cook County, GA, Crisp County, GA, Decatur County, GA, Dodge County, GA, Dooly County, GA, Dougherty County, GA, Early County, GA, Emanuel County, GA, Glascock County, GA, Grady County, GA, Irwin County, GA, Jeff Davis County, GA, Jefferson County, GA, Jenkins County, GA, Johnson County, GA, Lanier County, GA, Laurens County, GA, Lee County, GA, Lincoln County, GA, Lowndes County, GA, McDuffie County, GA, Miller County, GA, Mitchell County, GA, Montgomery County, GA, Pulaski County, GA, Randolph County, GA, Richmond County, GA, Screven County, GA, Seminole County, GA, Sumter County, GA, Telfair County, GA, Terrell County, GA, Thomas County, GA, Tift County, GA, Toombs County, GA, Treutlen County, GA, Turner County, GA, Warren County, GA, Washington County, GA, Wheeler County, GA, Wilcox County, GA, Worth County, GA, Aiken County, SC, Allendale County, SC, Barnwell County, SC, Edgefield County, SC, McCormick County, SC, Saluda County, SC

The radar

The Tallahassee radar (KTLH), 83 km from the middle of the area, began a volume at 01:35 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 00:00Z, 1.6 hours before the alert went out and 83 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-pSkew-T log-p diagram, Tallahassee Rgnl, FL at 00:00Z on 2008-02-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 593 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Tallahassee Rgnl, FL at 00:00Z on 2008-02-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 274 square meters per square second.1939587897Sfc1 km3 km6 km9 kmRMLM
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
593 J/kg
Mixed-layer CIN
-23 J/kg
Mixed-layer LCL
478 m above ground
0-6 km bulk shear
59 kt
0-1 km storm-relative helicity
274 m²/s²
0-3 km storm-relative helicity
290 m²/s²
Significant tornado parameter
0.9
Supercell composite
6.1

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.

IssuedProductOfficeCountiesLasted
Feb 17, 10:35 PM CSTMesoscale DiscussionSPCBay, Calhoun, Franklin, Gadsden, Gulf, Hamilton and 9 more85 min
Feb 18, 1:39 AM CSTMesoscale DiscussionSPCColumbia, Dixie, Franklin, Gadsden, Gilchrist, Hamilton and 8 more36 min
Feb 18, 1:57 AM CSTTornado WatchSPCBaker, Columbia, Dixie, Franklin, Gadsden, Gilchrist and 11 more7 hr
Feb 18, 4:11 AM CSTMesoscale DiscussionSPCBaker, Columbia, Dixie, Franklin, Gadsden, Gilchrist and 12 more64 min
Feb 18, 6:43 AM CSTMesoscale DiscussionSPCBaker, Bradford, Columbia, Dixie, Gilchrist, Hamilton and 7 more62 min
Feb 18, 7:46 AM CSTMesoscale DiscussionSPCAlachua, Baker, Bradford, Columbia, Gilchrist, Levy and 2 more29 min
Feb 18, 9:36 AM CSTMesoscale DiscussionSPCFlagler, Hernando, Lake, Marion, Orange, Pasco and 5 more84 min
Feb 18, 1:04 AM CSTMesoscale DiscussionSPCDarlington, Dillon, Florence, Georgetown, Horry, Marion and 2 more26 min
Feb 18, 1:30 AM CSTTornado WatchSPCDarlington, Dillon, Florence, Georgetown, Horry, Marion and 2 more7 hr

Nearby

Mesoscale Discussions in Georgia, 2008Mesoscale Discussions in Florida, 2008Mesoscale Discussions in South Carolina, 2008Every 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.