Alert archive / Georgia / Mesoscale Discussions in 2016

Mesoscale Discussion 1860

November 30, 20168 counties in Florida; 13 counties in Georgia

The Storm Prediction Center issued this mesoscale discussion at Nov 30, 2016, 4:45 PM CST for 8 counties in Florida; 13 counties in Georgia. It was in force for 30 min.

The area

The outline as issued.

The facts

Issued: Nov 30, 2016, 4:45 PM CST (22:45 UTC)
Expired: Nov 30, 2016, 5:15 PM CST
In force: 30 min
Issued by: the Storm Prediction Center

All 21 counties

Bay County, FL, Calhoun County, FL, Franklin County, FL, Gadsden County, FL, Gulf County, FL, Jackson County, FL, Leon County, FL, Liberty County, FL, Baker County, GA, Calhoun County, GA, Decatur County, GA, Dougherty County, GA, Early County, GA, Grady County, GA, Lee County, GA, Miller County, GA, Mitchell County, GA, Seminole County, GA, Sumter County, GA, Terrell County, GA, Worth County, GA

The radar

The Tallahassee radar (KTLH), 46 km from the middle of the area, began a volume at 22:49 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, 10.8 hours before the alert went out and 49 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: 43 J/kg
Mixed-layer CIN: -4 J/kg
Mixed-layer LCL: 552 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 219 m²/s²
0-3 km storm-relative helicity: 257 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.3

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Nov 30, 11:06 AM CST	Tornado Watch	SPC	Bay, Calhoun, Escambia, Holmes, Jackson, Okaloosa and 3 more	6 hr
Nov 30, 12:59 PM CST	Mesoscale Discussion	SPC	Escambia, Holmes, Jackson, Okaloosa, Santa Rosa, Walton and 1 more	2 hr
Nov 30, 1:55 PM CST	Mesoscale Discussion	SPC	Calhoun, Holmes, Jackson, Okaloosa, Santa Rosa, Walton and 1 more	2 hr
Nov 29, 9:28 PM CST	Mesoscale Discussion	SPC	Dade	62 min
Nov 29, 10:11 PM CST	Tornado Watch	SPC	Catoosa, Chattooga, Dade, Walker, Whitfield	5 hr
Nov 29, 11:17 PM CST	Mesoscale Discussion	SPC	Catoosa, Dade, Walker, Whitfield	118 min
Nov 30, 1:07 AM CST	Mesoscale Discussion	SPC	Catoosa, Dade, Walker, Whitfield	53 min
Nov 30, 2:54 AM CST	Tornado Watch	SPC	Bartow, Catoosa, Chattooga, Cherokee, Dade, Fannin and 10 more	7 hr
Nov 30, 5:10 AM CST	Mesoscale Discussion	SPC	Bartow, Carroll, Catoosa, Chattooga, Cherokee, Dade and 16 more	95 min
Nov 30, 9:00 AM CST	Mesoscale Discussion	SPC	Bartow, Carroll, Chattooga, Cherokee, Clayton, Cobb and 21 more	2 hr
Nov 30, 2:23 PM CST	Severe Thunderstorm Watch	SPC	Baldwin, Bibb, Bleckley, Columbia, Crisp, Dooly and 22 more	3 hr
Nov 30, 4:43 PM CST	Mesoscale Discussion	SPC	Columbia, Elbert, Glascock, Hancock, Lincoln, McDuffie and 5 more	92 min

Nearby

Mesoscale Discussions in Georgia, 2016 Mesoscale Discussions in Florida, 2016 Every mesoscale discussion in 2016

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.