Alert archive / Florida / Mesoscale Discussions in 2016

Mesoscale Discussion 382

April 15, 201613 counties in Florida

The Storm Prediction Center issued this mesoscale discussion at Apr 15, 2016, 2:09 PM EDT for 13 counties in Florida. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued: Apr 15, 2016, 2:09 PM EDT (18:09 UTC)
Expired: Apr 15, 2016, 4:45 PM EDT
In force: 3 hr
Issued by: the Storm Prediction Center
Chance of a watch: 40%

Counties Broward County, FL, DeSoto County, FL, Glades County, FL, Hardee County, FL, Hendry County, FL, Highlands County, FL, Indian River County, FL, Manatee County, FL, Martin County, FL, Miami-Dade County, FL, Okeechobee County, FL, Palm Beach County, FL, Saint Lucie County, FL

The radar

The Miami radar (KAMX), 143 km from the middle of the area, began a volume at 18:09 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

Severe Thunderstorm Watch 89Apr 15, 3:15 PM EDT

The nearest sounding before it

Miami, FL (KMFL), launched 12:00Z, 6.2 hours before the alert went out and 130 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: 785 J/kg
Mixed-layer CIN: -154 J/kg
Mixed-layer LCL: 856 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: -29 m²/s²
0-3 km storm-relative helicity: 74 m²/s²
Significant tornado parameter: -0.0
Supercell composite: -0.3

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 15, 3:14 PM EDT	Severe Thunderstorm Watch	SPC	Brevard, Broward, Collier, Glades, Hendry, Highlands and 9 more	6 hr
Apr 15, 4:33 PM EDT	Mesoscale Discussion	SPC	Brevard, Broward, Glades, Hendry, Highlands, Indian River and 7 more	87 min
Apr 15, 6:55 PM EDT	Mesoscale Discussion	SPC	Broward, Miami-Dade, Palm Beach	95 min

Nearby

Mesoscale Discussions in Florida, 2016 Every mesoscale discussion in 2016

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.