Alert archive / Florida / Mesoscale Discussions in 2020

Mesoscale Discussion 464

April 23, 20205 counties in Florida

The Storm Prediction Center issued this mesoscale discussion at Apr 23, 2020, 9:08 PM EDT for 5 counties in Florida. It was in force for 67 min.

The area

The outline as issued.

The facts

Issued: Apr 23, 2020, 9:08 PM EDT (01:08 UTC)
Expired: Apr 23, 2020, 10:15 PM EDT
In force: 67 min
Issued by: the Storm Prediction Center

Counties Alachua County, FL, Bradford County, FL, Clay County, FL, Gilchrist County, FL, Putnam County, FL

The radar

The Jacksonville radar (KJAX), 96 km from the middle of the area, began a volume at 01:09 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, 1.1 hours before the alert went out and 97 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 960 m above ground
0-6 km bulk shear: 78 kt
0-1 km storm-relative helicity: -46 m²/s²
0-3 km storm-relative helicity: 102 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 3.8

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 24, 12:27 AM EDT	Mesoscale Discussion	SPC	Alachua, Baker, Bradford, Columbia, Dixie, Gilchrist and 7 more	93 min
Apr 24, 1:57 AM EDT	Tornado Watch	SPC	Alachua, Brevard, Citrus, Dixie, Flagler, Gilchrist and 17 more	9 hr
Apr 24, 3:59 AM EDT	Mesoscale Discussion	SPC	Brevard, Citrus, Flagler, Hardee, Hernando, Hillsborough and 13 more	2 hr
Apr 24, 8:14 AM EDT	Mesoscale Discussion	SPC	Brevard, Charlotte, DeSoto, Hardee, Highlands, Indian River and 3 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.