Alert archive / Florida / Mesoscale Discussions in 2020

Mesoscale Discussion 862

June 6, 202010 counties in Florida

The Storm Prediction Center issued this mesoscale discussion at Jun 6, 2020, 9:38 PM EDT for 10 counties in Florida. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Jun 6, 2020, 9:38 PM EDT (01:38 UTC)
Expired: Jun 6, 2020, 11:45 PM EDT
In force: 2 hr
Issued by: the Storm Prediction Center
Concerning: Severe potential...watch unlikely
Chance of a watch: 20%

Counties Bradford County, FL, Clay County, FL, Duval County, FL, Flagler County, FL, Marion County, FL, Orange County, FL, Putnam County, FL, Saint Johns County, FL, Seminole County, FL, Volusia County, FL

The radar

The Melbourne radar (KMLB), 141 km from the middle of the area, began a volume at 01:37 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

Cape Canaveral, FL (KXMR), launched 00:00Z, 1.6 hours before the alert went out and 121 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: 2089 J/kg
Mixed-layer CIN: -4 J/kg
Mixed-layer LCL: 640 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 118 m²/s²
0-3 km storm-relative helicity: 193 m²/s²
Significant tornado parameter: 0.9
Supercell composite: 5.9

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
Jun 7, 12:40 AM EDT	Mesoscale Discussion	SPC	Charlotte, Citrus, DeSoto, Dixie, Franklin, Gilchrist and 14 more	2 hr
Jun 7, 7:12 AM EDT	Mesoscale Discussion	SPC	Bay, Calhoun, Escambia, Franklin, Gadsden, Gulf and 6 more	2 hr
Jun 7, 3:41 PM EDT	Mesoscale Discussion	SPC	Alachua, Baker, Bradford, Clay, Columbia, Dixie and 12 more	2 hr

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.