Alert archive / Georgia / Mesoscale Discussions in 2014

Mesoscale Discussion 1917

November 17, 201415 counties in Alabama; 20 counties in Florida; 38 counties in Georgia

The Storm Prediction Center issued this mesoscale discussion at Nov 17, 2014, 4:39 AM CST for 15 counties in Alabama; 20 counties in Florida; 38 counties in Georgia. It was in force for 66 min.

The area

The outline as issued.

The facts

Issued: Nov 17, 2014, 4:39 AM CST (10:39 UTC)
Expired: Nov 17, 2014, 5:45 AM CST
In force: 66 min
Issued by: the Storm Prediction Center

All 73 counties

Baldwin County, AL, Barbour County, AL, Bullock County, AL, Butler County, AL, Coffee County, AL, Conecuh County, AL, Covington County, AL, Crenshaw County, AL, Dale County, AL, Escambia County, AL, Geneva County, AL, Henry County, AL, Houston County, AL, Pike County, AL, Russell County, AL, Bay County, FL, Calhoun County, FL, Dixie County, FL, Escambia County, FL, Franklin County, FL, Gadsden County, FL, Gulf County, FL, Holmes County, FL, Jackson County, FL, Jefferson County, FL, Lafayette County, FL, Leon County, FL, Liberty County, FL, Madison County, FL, Okaloosa County, FL, Santa Rosa County, FL, Taylor County, FL, Wakulla County, FL, Walton County, FL, Washington County, FL, Baker County, GA, Ben Hill County, GA, Berrien County, GA, Brooks County, GA, Calhoun County, GA, Chattahoochee County, GA, Clay County, GA, Colquitt County, GA, Cook County, GA, Crisp County, GA, Decatur County, GA, Dodge County, GA, Dooly County, GA, Dougherty County, GA, Early County, GA, Grady County, GA, Irwin County, GA, Lanier County, GA, Lee County, GA, Lowndes County, GA, Macon County, GA, Marion County, GA, Miller County, GA, Mitchell County, GA, Pulaski County, GA, Quitman County, GA, Randolph County, GA, Schley County, GA, Seminole County, GA, Stewart County, GA, Sumter County, GA, Terrell County, GA, Thomas County, GA, Tift County, GA, Turner County, GA, Webster County, GA, Wilcox County, GA, Worth County, GA

The radar

The Eglin Afb radar (KEVX), 55 km from the middle of the area, began a volume at 10:40 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.

Tornado Watch 553Nov 17, 5:10 AM CST

The nearest sounding before it

Tallahassee Rgnl, FL (KTLH), launched 00:00Z, 10.7 hours before the alert went out and 102 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: 15 J/kg
Mixed-layer CIN: -18 J/kg
Mixed-layer LCL: 649 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 138 m²/s²
0-3 km storm-relative helicity: 183 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
Nov 16, 8:43 PM CST	Mesoscale Discussion	SPC	Washington	62 min
Nov 16, 9:49 PM CST	Tornado Watch	SPC	Mobile, Washington	7 hr
Nov 16, 11:50 PM CST	Mesoscale Discussion	SPC	Choctaw, Clarke, Escambia, Monroe, Washington	55 min
Nov 17, 1:13 AM CST	Mesoscale Discussion	SPC	Baldwin, Barbour, Butler, Coffee, Conecuh, Covington and 8 more	32 min
Nov 17, 1:32 AM CST	Tornado Watch	SPC	Baldwin, Barbour, Bullock, Butler, Clarke, Coffee and 11 more	7 hr
Nov 17, 2:21 AM CST	Mesoscale Discussion	SPC	Mobile, Washington	114 min
Nov 17, 7:43 AM CST	Mesoscale Discussion	SPC	Barbour, Dale, Geneva, Henry, Houston	92 min
Nov 17, 5:11 AM CST	Tornado Watch	SPC	Columbia, Dixie, Franklin, Gadsden, Hamilton, Jefferson and 7 more	8 hr
Nov 17, 9:57 AM CST	Tornado Watch	SPC	Alachua, Baker, Bradford, Clay, Duval, Flagler and 5 more	4 hr
Nov 17, 11:14 AM CST	Mesoscale Discussion	SPC	Brevard, Citrus, Dixie, Flagler, Hernando, Hillsborough and 11 more	2 hr
Nov 17, 11:30 AM CST	Tornado Watch	SPC	Brevard, Charlotte, Citrus, DeSoto, Hardee, Hernando and 16 more	6 hr
Nov 17, 2:10 PM CST	Mesoscale Discussion	SPC	DeSoto, Hardee, Highlands, Hillsborough, Lake, Manatee and 5 more	65 min

Nearby

Mesoscale Discussions in Georgia, 2014 Mesoscale Discussions in Florida, 2014 Mesoscale Discussions in Alabama, 2014 Every mesoscale discussion in 2014

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.