Alert archive / Florida / Mesoscale Discussions in 2017

Mesoscale Discussion 150

February 7, 20179 counties in Alabama; 15 counties in Florida; 13 counties in Georgia

The Storm Prediction Center issued this mesoscale discussion at Feb 7, 2017, 2:44 PM CST for 9 counties in Alabama; 15 counties in Florida; 13 counties in Georgia. It was in force for 91 min.

The area

The outline as issued.

The facts

Issued: Feb 7, 2017, 2:44 PM CST (20:44 UTC)
Expired: Feb 7, 2017, 4:15 PM CST
In force: 91 min
Issued by: the Storm Prediction Center

All 37 counties

Baldwin County, AL, Coffee County, AL, Conecuh County, AL, Covington County, AL, Dale County, AL, Escambia County, AL, Geneva County, AL, Henry County, AL, Houston County, AL, Bay County, FL, Calhoun County, FL, Escambia 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, Santa Rosa County, FL, Wakulla County, FL, Walton County, FL, Washington County, FL, Baker County, GA, Calhoun County, GA, Clay County, GA, Colquitt County, GA, Decatur County, GA, Dougherty County, GA, Early County, GA, Grady County, GA, Miller County, GA, Mitchell County, GA, Seminole County, GA, Thomas County, GA, Worth County, GA

The radar

The Eglin Afb radar (KEVX), 20 km from the middle of the area, began a volume at 20:46 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.

The nearest sounding before it

Tallahassee Rgnl, FL (KTLH), launched 12:00Z, 8.7 hours before the alert went out and 167 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, 5:59 AM CST	Mesoscale Discussion	SPC	Baldwin, Choctaw, Clarke, Mobile, Washington	2 hr
Feb 7, 11:20 AM CST	Mesoscale Discussion	SPC	Baldwin, Butler, Clarke, Coffee, Conecuh, Covington and 6 more	115 min
Feb 7, 11:50 AM CST	Tornado Watch	SPC	Baldwin, Butler, Choctaw, Clarke, Conecuh, Covington and 6 more	6 hr
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, 5:24 PM CST	Mesoscale Discussion	SPC	Calhoun, Gadsden, Jefferson, Leon, Liberty, Madison and 2 more	96 min
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 Florida, 2017 Mesoscale Discussions in Georgia, 2017 Mesoscale Discussions in Alabama, 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.