Alert archive / Florida / Mesoscale Discussions in 2017

Mesoscale Discussion 157

February 7, 201713 counties in Florida; Brantley County, Camden County, Charlton County, Georgia

The Storm Prediction Center issued this mesoscale discussion at Feb 7, 2017, 9:36 PM EST for 13 counties in Florida; Brantley County, Camden County, Charlton County, Georgia. It was in force for 114 min.

The area

The outline as issued.

The facts

Issued: Feb 7, 2017, 9:36 PM EST (02:36 UTC)
Expired: Feb 7, 2017, 11:30 PM EST
In force: 114 min
Issued by: the Storm Prediction Center

Counties Alachua County, FL, Bradford County, FL, Citrus County, FL, Clay County, FL, Duval County, FL, Hernando County, FL, Hillsborough County, FL, Lake County, FL, Marion County, FL, Nassau County, FL, Pasco County, FL, Putnam County, FL, Sumter County, FL, Brantley County, GA, Camden County, GA, Charlton County, GA

The radar

The Jacksonville radar (KJAX), 146 km from the middle of the area, began a volume at 02:36 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

Jacksonville, FL (KJAX), launched 00:00Z, 2.6 hours before the alert went out and 147 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: 433 J/kg
Mixed-layer CIN: -33 J/kg
Mixed-layer LCL: 1356 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 135 m²/s²
0-3 km storm-relative helicity: 280 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 0.9

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, 7:37 PM EST	Severe Thunderstorm Watch	SPC	Alachua, Baker, Bradford, Columbia, Gilchrist, Hamilton and 3 more	3 hr
Feb 8, 3:45 PM EST	Mesoscale Discussion	SPC	Alachua, Baker, Bay, Bradford, Calhoun, Clay and 24 more	60 min
Feb 8, 5:53 PM EST	Severe Thunderstorm Watch	SPC	Bartow, Catoosa, Chattooga, Cherokee, Dade, Fannin and 8 more	6 hr

Nearby

Mesoscale Discussions in Florida, 2017 Mesoscale Discussions in Georgia, 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.