Alert archive / Florida / Mesoscale Discussions in 2015

Mesoscale Discussion 486

April 28, 201511 counties in Florida

The Storm Prediction Center issued this mesoscale discussion at Apr 28, 2015, 12:23 PM EDT for 11 counties in Florida. It was in force for 97 min.

The area

The outline as issued.

The facts

Issued: Apr 28, 2015, 12:23 PM EDT (16:23 UTC)
Expired: Apr 28, 2015, 2:00 PM EDT
In force: 97 min
Issued by: the Storm Prediction Center
Chance of a watch: 40%

Counties Broward County, FL, Charlotte County, FL, Collier County, FL, DeSoto County, FL, Glades County, FL, Hendry County, FL, Lee County, FL, Martin County, FL, Palm Beach County, FL, Saint Lucie County, FL, Sarasota County, FL

The nearest sounding before it

Miami, FL (KMFL), launched 12:00Z, 4.4 hours before the alert went out and 143 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: 2315 J/kg
Mixed-layer CIN: -9 J/kg
Mixed-layer LCL: 697 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 138 m²/s²
0-3 km storm-relative helicity: 220 m²/s²
Significant tornado parameter: 2.3
Supercell composite: 8.9

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 28, 8:35 AM EDT	Mesoscale Discussion	SPC	Charlotte, DeSoto, Glades, Hardee, Hendry, Highlands and 6 more	115 min

Nearby

Mesoscale Discussions in Florida, 2015 Every mesoscale discussion in 2015

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.