Alert archive / Florida / Mesoscale Discussions in 2013

Mesoscale Discussion 388

April 4, 20134 counties in Florida

The Storm Prediction Center issued this mesoscale discussion at Apr 4, 2013, 7:37 PM EDT for 4 counties in Florida. It was in force for 83 min.

The area

The outline as issued.

The facts

Issued: Apr 4, 2013, 7:37 PM EDT (23:37 UTC)
Expired: Apr 4, 2013, 9:00 PM EDT
In force: 83 min
Issued by: the Storm Prediction Center

Counties Broward County, FL, Collier County, FL, Miami-Dade County, FL, Monroe County, FL

The radar

The Miami radar (KAMX), 61 km from the middle of the area, began a volume at 23:37 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 12:00Z, 11.6 hours before the alert went out and 79 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: 124 J/kg
Mixed-layer CIN: -103 J/kg
Mixed-layer LCL: 1029 m above ground
0-6 km bulk shear: 52 kt
0-1 km storm-relative helicity: 73 m²/s²
0-3 km storm-relative helicity: 78 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.2

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 4, 4:13 AM EDT	Mesoscale Discussion	SPC	Charlotte, Lee, Sarasota	3 hr
Apr 4, 10:08 AM EDT	Mesoscale Discussion	SPC	Broward, Charlotte, DeSoto, Glades, Hardee, Hendry and 7 more	67 min
Apr 4, 12:14 PM EDT	Tornado Watch	SPC	Brevard, Broward, Charlotte, Collier, DeSoto, Glades and 17 more	8 hr
Apr 4, 2:23 PM EDT	Mesoscale Discussion	SPC	Broward, Collier, Glades, Hendry, Martin, Miami-Dade and 3 more	97 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.