Alert archive / Florida / Mesoscale Discussions in 2006

Mesoscale Discussion 615

April 22, 200611 counties in Florida

The Storm Prediction Center issued this mesoscale discussion at Apr 22, 2006, 12:20 PM EDT for 11 counties in Florida. It was in force for 85 min.

The area

The outline as issued.

The facts

Issued: Apr 22, 2006, 12:20 PM EDT (16:20 UTC)
Expired: Apr 22, 2006, 1:45 PM EDT
In force: 85 min
Issued by: the Storm Prediction Center

Counties Alachua County, FL, Bradford County, FL, Clay County, FL, Columbia County, FL, Flagler County, FL, Gilchrist County, FL, Marion County, FL, Putnam County, FL, Saint Johns County, FL, Union County, FL, Volusia County, FL

The radar

The Jacksonville radar (KJAX), 99 km from the middle of the area, began a volume at 16:23 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

Tallahassee Rgnl, FL (KTLH), launched 12:00Z, 4.3 hours before the alert went out and 219 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: 229 J/kg
Mixed-layer CIN: -126 J/kg
Mixed-layer LCL: 918 m above ground
0-6 km bulk shear: 48 kt
0-1 km storm-relative helicity: 53 m²/s²
0-3 km storm-relative helicity: 108 m²/s²
Significant tornado parameter: -0.1
Supercell composite: -1.7

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 21, 11:40 PM EDT	Mesoscale Discussion	SPC	Bay, Calhoun, Escambia, Holmes, Jackson, Okaloosa and 3 more	2 hr
Apr 21, 11:48 PM EDT	Tornado Watch	SPC	Bay, Calhoun, Escambia, Franklin, Gulf, Holmes and 6 more	4 hr
Apr 22, 3:54 AM EDT	Mesoscale Discussion	SPC	Bay, Calhoun, Escambia, Gulf, Holmes, Jackson and 5 more	96 min

Nearby

Mesoscale Discussions in Florida, 2006 Every mesoscale discussion in 2006

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.