Alert archive / Florida / Mesoscale Discussions in 2020

Mesoscale Discussion 385

April 13, 20207 counties in Florida

The Storm Prediction Center issued this mesoscale discussion at Apr 13, 2020, 4:06 PM EDT for 7 counties in Florida. It was in force for 84 min.

The area

The outline as issued.

The facts

Issued: Apr 13, 2020, 4:06 PM EDT (20:06 UTC)
Expired: Apr 13, 2020, 5:30 PM EDT
In force: 84 min
Issued by: the Storm Prediction Center
Chance of a watch: 5%

Counties Alachua County, FL, Bradford County, FL, Clay County, FL, Levy County, FL, Marion County, FL, Putnam County, FL, Saint Johns County, FL

The radar

The Jacksonville radar (KJAX), 104 km from the middle of the area, began a volume at 20:07 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 12:00Z, 8.1 hours before the alert went out and 105 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: 1152 J/kg
Mixed-layer CIN: -12 J/kg
Mixed-layer LCL: 756 m above ground
0-6 km bulk shear: 65 kt
0-1 km storm-relative helicity: 550 m²/s²
0-3 km storm-relative helicity: 743 m²/s²
Significant tornado parameter: 4.7
Supercell composite: 16.6

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
Apr 12, 11:28 PM EDT	Mesoscale Discussion	SPC	Escambia, Holmes, Okaloosa, Santa Rosa, Walton	92 min
Apr 12, 11:45 PM EDT	Tornado Watch	SPC	Bay, Calhoun, Escambia, Gulf, Holmes, Jackson and 4 more	8 hr
Apr 13, 3:20 AM EDT	Tornado Watch	SPC	Baker, Columbia, Duval, Franklin, Gadsden, Hamilton and 9 more	8 hr
Apr 13, 6:17 AM EDT	Mesoscale Discussion	SPC	Hamilton, Jefferson, Leon, Madison	88 min

Nearby

Mesoscale Discussions in Florida, 2020 Every mesoscale discussion in 2020

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.