Alert archive / Georgia / Mesoscale Discussions in 2015

Mesoscale Discussion 1983

November 18, 20157 counties in Florida; 61 counties in Georgia

The Storm Prediction Center issued this mesoscale discussion at Nov 18, 2015, 6:35 PM EST for 7 counties in Florida; 61 counties in Georgia. It was in force for 115 min.

The area

The outline as issued.

The facts

Issued
Nov 18, 2015, 6:35 PM EST (23:35 UTC)
Expired
Nov 18, 2015, 8:30 PM EST
In force
115 min
Issued by
the Storm Prediction Center
All 68 counties

Franklin County, FL, Gadsden County, FL, Gulf County, FL, Jefferson County, FL, Leon County, FL, Liberty County, FL, Wakulla County, FL, Baker County, GA, Baldwin County, GA, Bibb County, GA, Bleckley County, GA, Brooks County, GA, Butts County, GA, Calhoun County, GA, Colquitt County, GA, Crawford County, GA, Crisp County, GA, Decatur County, GA, Dodge County, GA, Dooly County, GA, Dougherty County, GA, Early County, GA, Glascock County, GA, Grady County, GA, Greene County, GA, Hancock County, GA, Henry County, GA, Houston County, GA, Jasper County, GA, Jones County, GA, Lamar County, GA, Lee County, GA, Macon County, GA, Marion County, GA, McDuffie County, GA, Miller County, GA, Mitchell County, GA, Monroe County, GA, Morgan County, GA, Newton County, GA, Oconee County, GA, Oglethorpe County, GA, Peach County, GA, Pike County, GA, Pulaski County, GA, Putnam County, GA, Randolph County, GA, Rockdale County, GA, Schley County, GA, Seminole County, GA, Spalding County, GA, Sumter County, GA, Talbot County, GA, Taliaferro County, GA, Taylor County, GA, Terrell County, GA, Thomas County, GA, Tift County, GA, Turner County, GA, Twiggs County, GA, Upson County, GA, Walton County, GA, Warren County, GA, Washington County, GA, Webster County, GA, Wilcox County, GA, Wilkinson County, GA, Worth County, GA

The radar

The Tallahassee radar (KTLH), 99 km from the middle of the area, began a volume at 23:35 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

The nearest sounding before it

Tallahassee Rgnl, FL (KTLH), launched 12:00Z, 11.6 hours before the alert went out and 98 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 12:00Z on 2015-11-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 5 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 12:00Z on 2015-11-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 219 square meters per square second.193958Sfc1 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
5 J/kg
Mixed-layer CIN
-62 J/kg
Mixed-layer LCL
674 m above ground
0-6 km bulk shear
30 kt
0-1 km storm-relative helicity
219 m²/s²
0-3 km storm-relative helicity
261 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.

IssuedProductOfficeCountiesLasted
Nov 18, 3:49 AM ESTTornado WatchSPCEscambia6 hr
Nov 18, 6:21 AM ESTMesoscale DiscussionSPCEscambia114 min
Nov 18, 8:22 AM ESTMesoscale DiscussionSPCEscambia, Okaloosa, Santa Rosa, Walton83 min
Nov 18, 9:25 AM ESTTornado WatchSPCBay, Calhoun, Escambia, Gulf, Holmes, Jackson and 4 more8 hr
Nov 18, 11:51 AM ESTMesoscale DiscussionSPCBay, Calhoun, Escambia, Gadsden, Gulf, Holmes and 9 more114 min
Nov 18, 2:39 PM ESTMesoscale DiscussionSPCBay, Calhoun, Franklin, Gadsden, Gulf, Holmes and 8 more2 hr
Nov 18, 3:16 PM ESTTornado WatchSPCBay, Calhoun, Franklin, Gadsden, Gulf, Holmes and 6 more6 hr
Nov 18, 1:17 PM ESTMesoscale DiscussionSPCBartow, Butts, Carroll, Clayton, Cobb, Coweta and 18 more88 min

Nearby

Mesoscale Discussions in Georgia, 2015Mesoscale Discussions in Florida, 2015Every mesoscale discussion in 2015

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.