Alert archive / Georgia / Mesoscale Discussions in 2017

Mesoscale Discussion 154

February 7, 20178 counties in Florida; 12 counties in Georgia

The Storm Prediction Center issued this mesoscale discussion at Feb 7, 2017, 5:24 PM CST for 8 counties in Florida; 12 counties in Georgia. It was in force for 96 min.

The area

The outline as issued.

The facts

Issued: Feb 7, 2017, 5:24 PM CST (23:24 UTC)
Expired: Feb 7, 2017, 7:00 PM CST
In force: 96 min
Issued by: the Storm Prediction Center

Counties Calhoun County, FL, Gadsden County, FL, Jefferson County, FL, Leon County, FL, Liberty County, FL, Madison County, FL, Taylor County, FL, Wakulla County, FL, Baker County, GA, Brooks County, GA, Colquitt County, GA, Cook County, GA, Decatur County, GA, Grady County, GA, Miller County, GA, Mitchell County, GA, Seminole County, GA, Thomas County, GA, Tift County, GA, Worth County, GA

The radar

The Tallahassee radar (KTLH), 17 km from the middle of the area, began a volume at 23:29 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, 11.4 hours before the alert went out and 18 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: 10 J/kg
Mixed-layer CIN: -140 J/kg
Mixed-layer LCL: 1140 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 84 m²/s²
0-3 km storm-relative helicity: 147 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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
Feb 7, 11:20 AM CST	Mesoscale Discussion	SPC	Escambia, Holmes, Okaloosa, Santa Rosa, Walton, Washington	115 min
Feb 7, 11:50 AM CST	Tornado Watch	SPC	Escambia, Okaloosa, Santa Rosa	6 hr
Feb 7, 2:44 PM CST	Mesoscale Discussion	SPC	Bay, Calhoun, Escambia, Gadsden, Gulf, Holmes and 9 more	91 min
Feb 7, 3:27 PM CST	Severe Thunderstorm Watch	SPC	Bay, Calhoun, Gulf, Holmes, Jackson, Walton and 1 more	3 hr
Feb 7, 4:33 PM CST	Severe Thunderstorm Watch	SPC	Dixie, Franklin, Gadsden, Jefferson, Lafayette, Leon and 4 more	4 hr
Feb 7, 5:58 PM CST	Mesoscale Discussion	SPC	Alachua, Baker, Bradford, Clay, Columbia, Duval and 5 more	3 hr
Feb 7, 4:25 PM CST	Mesoscale Discussion	SPC	Baldwin, Bibb, Bleckley, Butts, Crawford, Dodge and 23 more	2 hr

Nearby

Mesoscale Discussions in Georgia, 2017 Mesoscale Discussions in Florida, 2017 Every mesoscale discussion in 2017

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.