Alert archive / Florida / Mesoscale Discussions in 2013

Mesoscale Discussion 974

June 6, 201319 counties in Florida

The Storm Prediction Center issued this mesoscale discussion at Jun 6, 2013, 3:17 AM EDT for 19 counties in Florida. It was in force for 118 min.

The area

The outline as issued.

The facts

Issued: Jun 6, 2013, 3:17 AM EDT (07:17 UTC)
Expired: Jun 6, 2013, 5:15 AM EDT
In force: 118 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, Hardee County, FL, Hendry County, FL, Highlands County, FL, Hillsborough County, FL, Lee County, FL, Manatee County, FL, Martin County, FL, Miami-Dade County, FL, Monroe County, FL, Okeechobee County, FL, Palm Beach County, FL, Pinellas County, FL, Polk County, FL, Sarasota County, FL

The radar

The Miami radar (KAMX), 120 km from the middle of the area, began a volume at 07:17 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.

Tornado Watch 282Jun 6, 3:45 AM EDT

The nearest sounding before it

Miami, FL (KMFL), launched 00:00Z, 7.3 hours before the alert went out and 118 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: 1865 J/kg
Mixed-layer CIN: 0 J/kg
Mixed-layer LCL: 618 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 90 m²/s²
0-3 km storm-relative helicity: 219 m²/s²
Significant tornado parameter: 0.5
Supercell composite: 3.4

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
Jun 5, 8:48 PM EDT	Mesoscale Discussion	SPC	Collier, Lee, Miami-Dade, Monroe, Sarasota	2 hr
Jun 6, 3:42 AM EDT	Tornado Watch	SPC	Brevard, Broward, Charlotte, Citrus, Collier, DeSoto and 23 more	7 hr
Jun 6, 6:52 AM EDT	Mesoscale Discussion	SPC	Brevard, Broward, Collier, DeSoto, Glades, Hardee and 16 more	83 min
Jun 6, 10:03 AM EDT	Mesoscale Discussion	SPC	Brevard, Broward, Charlotte, Citrus, Collier, DeSoto and 21 more	57 min
Jun 6, 10:43 AM EDT	Tornado Watch	SPC	Alachua, Baker, Bradford, Brevard, Broward, Charlotte and 38 more	11 hr
Jun 6, 1:25 PM EDT	Mesoscale Discussion	SPC	Alachua, Baker, Bradford, Brevard, Broward, Charlotte and 37 more	65 min
Jun 6, 4:50 PM EDT	Mesoscale Discussion	SPC	Alachua, Baker, Bradford, Brevard, Broward, Charlotte and 37 more	55 min
Jun 6, 6:35 PM EDT	Mesoscale Discussion	SPC	Escambia, Okaloosa, Santa Rosa	115 min
Jun 6, 7:32 PM EDT	Mesoscale Discussion	SPC	Alachua, Baker, Bradford, Brevard, Broward, Charlotte and 33 more	118 min

Nearby

Mesoscale Discussions in Florida, 2013 Every mesoscale discussion in 2013

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.