Alert archive / Georgia / Mesoscale Discussions in 2015

Mesoscale Discussion 2037

December 23, 201510 counties in Alabama; 14 counties in Florida; 22 counties in Georgia

The Storm Prediction Center issued this mesoscale discussion at Dec 23, 2015, 11:42 AM CST for 10 counties in Alabama; 14 counties in Florida; 22 counties in Georgia. It was in force for 93 min.

The area

The outline as issued.

The facts

Issued: Dec 23, 2015, 11:42 AM CST (17:42 UTC)
Expired: Dec 23, 2015, 1:15 PM CST
In force: 93 min
Issued by: the Storm Prediction Center
Chance of a watch: 20%

All 46 counties

Barbour County, AL, Bullock County, AL, Coffee County, AL, Covington County, AL, Crenshaw County, AL, Dale County, AL, Geneva County, AL, Henry County, AL, Houston County, AL, Pike 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, Okaloosa County, FL, Wakulla County, FL, Walton County, FL, Washington County, FL, Baker County, GA, Brooks County, GA, Calhoun County, GA, Clay County, GA, Colquitt County, GA, Cook County, GA, Decatur County, GA, Dougherty County, GA, Early County, GA, Grady County, GA, Lee County, GA, Miller County, GA, Mitchell County, GA, Quitman County, GA, Randolph County, GA, Seminole County, GA, Stewart County, GA, Terrell County, GA, Thomas County, GA, Tift County, GA, Webster County, GA, Worth County, GA

The radar

The Eglin Afb radar (KEVX), 77 km from the middle of the area, began a volume at 17:41 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 562Dec 23, 2:15 PM CST

The nearest sounding before it

Tallahassee Rgnl, FL (KTLH), launched 12:00Z, 5.7 hours before the alert went out and 94 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: 165 J/kg
Mixed-layer CIN: -59 J/kg
Mixed-layer LCL: 597 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 247 m²/s²
0-3 km storm-relative helicity: 275 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.1

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.

Issued	Product	Office	Counties	Lasted
Dec 23, 1:33 PM CST	Mesoscale Discussion	SPC	Autauga, Chilton, Choctaw, Clarke, Dallas, Greene and 7 more	57 min
Dec 23, 2:17 PM CST	Tornado Watch	SPC	Autauga, Bibb, Chilton, Choctaw, Clarke, Dallas and 11 more	6 hr
Dec 23, 2:49 PM CST	Mesoscale Discussion	SPC	Lauderdale	86 min
Dec 23, 4:26 PM CST	Mesoscale Discussion	SPC	Blount, Colbert, Cullman, Franklin, Jackson, Lauderdale and 7 more	64 min
Dec 23, 4:49 PM CST	Tornado Watch	SPC	Colbert, Cullman, Franklin, Lauderdale, Lawrence, Limestone and 2 more	6 hr
Dec 23, 5:12 PM CST	Mesoscale Discussion	SPC	Autauga, Bibb, Butler, Chilton, Choctaw, Clarke and 12 more	63 min

Nearby

Mesoscale Discussions in Georgia, 2015 Mesoscale Discussions in Florida, 2015 Mesoscale Discussions in Alabama, 2015 Every 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.