Alert archive / Florida / Mesoscale Discussions in 2012

Mesoscale Discussion 1254

June 23, 20126 counties in Florida

The Storm Prediction Center issued this mesoscale discussion at Jun 23, 2012, 8:09 PM EDT for 6 counties in Florida. It was in force for 66 min.

The area

The outline as issued.

The facts

Issued: Jun 23, 2012, 8:09 PM EDT (00:09 UTC)
Expired: Jun 23, 2012, 9:15 PM EDT
In force: 66 min
Issued by: the Storm Prediction Center
Chance of a watch: 20%

Counties Charlotte County, FL, Collier County, FL, Lee County, FL, Manatee County, FL, Pinellas County, FL, Sarasota County, FL

The radar

The Tampa radar (KTBW), 107 km from the middle of the area, began a volume at 00:09 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

Miami, FL (KMFL), launched 00:00Z, 0.2 hours before the alert went out and 213 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: 233 J/kg
Mixed-layer CIN: -268 J/kg
Mixed-layer LCL: 638 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: 10 m²/s²
0-3 km storm-relative helicity: -4 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 24, 11:02 AM EDT	Mesoscale Discussion	SPC	Broward, Charlotte, Citrus, Collier, DeSoto, Dixie and 16 more	2 hr
Jun 24, 11:47 AM EDT	Tornado Watch	SPC	Broward, Charlotte, Citrus, Collier, DeSoto, Glades and 16 more	8 hr
Jun 24, 4:36 PM EDT	Mesoscale Discussion	SPC	Broward, Charlotte, Citrus, Collier, DeSoto, Glades and 15 more	114 min
Jun 24, 7:01 PM EDT	Mesoscale Discussion	SPC	Charlotte, Citrus, DeSoto, Dixie, Gilchrist, Glades and 17 more	59 min
Jun 24, 7:46 PM EDT	Tornado Watch	SPC	Alachua, Brevard, Charlotte, Citrus, Collier, DeSoto and 28 more	9 hr

Nearby

Mesoscale Discussions in Florida, 2012 Every mesoscale discussion in 2012

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.