Alert archive / Georgia / Mesoscale Discussions in 2019

Mesoscale Discussion 8

January 4, 20196 counties in Florida; 11 counties in Georgia

The Storm Prediction Center issued this mesoscale discussion at Jan 4, 2019, 5:05 AM CST for 6 counties in Florida; 11 counties in Georgia. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Jan 4, 2019, 5:05 AM CST (11:05 UTC)
Expired: Jan 4, 2019, 7:30 AM CST
In force: 2 hr
Issued by: the Storm Prediction Center
Chance of a watch: 20%

Counties Calhoun County, FL, Gadsden County, FL, Gulf County, FL, Leon County, FL, Liberty County, FL, Wakulla County, FL, Baker County, GA, Calhoun County, GA, Clay County, GA, Decatur County, GA, Dougherty County, GA, Early County, GA, Grady County, GA, Miller County, GA, Mitchell County, GA, Randolph County, GA, Seminole County, GA

The radar

The Tallahassee radar (KTLH), 64 km from the middle of the area, began a volume at 11:08 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, 11.1 hours before the alert went out and 66 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: 72 J/kg
Mixed-layer CIN: -44 J/kg
Mixed-layer LCL: 785 m above ground
0-6 km bulk shear: 64 kt
0-1 km storm-relative helicity: 92 m²/s²
0-3 km storm-relative helicity: 74 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.4

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
Jan 4, 1:04 AM CST	Mesoscale Discussion	SPC	Escambia, Okaloosa, Santa Rosa, Walton, Washington	116 min

Nearby

Mesoscale Discussions in Georgia, 2019 Mesoscale Discussions in Florida, 2019 Every mesoscale discussion in 2019

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.