Alert archive / Florida / Mesoscale Discussions in 2013

Mesoscale Discussion 327

March 24, 20137 counties in Florida

The Storm Prediction Center issued this mesoscale discussion at Mar 24, 2013, 5:35 PM EDT for 7 counties in Florida. It was in force for 115 min.

The area

The outline as issued.

The facts

Issued: Mar 24, 2013, 5:35 PM EDT (21:35 UTC)
Expired: Mar 24, 2013, 7:30 PM EDT
In force: 115 min
Issued by: the Storm Prediction Center
Chance of a watch: 5%

Counties Charlotte County, FL, Glades County, FL, Highlands County, FL, Lee County, FL, Martin County, FL, Okeechobee County, FL, Saint Lucie County, FL

The radar

The Melbourne radar (KMLB), 137 km from the middle of the area, began a volume at 21:34 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

Tampa Bay, FL (KTBW), launched 12:00Z, 9.6 hours before the alert went out and 150 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: 763 J/kg
Mixed-layer CIN: -176 J/kg
Mixed-layer LCL: 490 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 299 m²/s²
0-3 km storm-relative helicity: 413 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 2.4

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
Mar 24, 4:12 AM EDT	Mesoscale Discussion	SPC	Bay, Calhoun, Franklin, Gadsden, Gulf, Holmes and 6 more	93 min
Mar 24, 4:42 AM EDT	Tornado Watch	SPC	Bay, Calhoun, Dixie, Franklin, Gadsden, Gulf and 9 more	6 hr
Mar 24, 7:54 AM EDT	Mesoscale Discussion	SPC	Alachua, Baker, Bradford, Clay, Columbia, Dixie and 18 more	66 min
Mar 24, 10:09 AM EDT	Mesoscale Discussion	SPC	Alachua, Baker, Bradford, Clay, Duval, Levy and 4 more	66 min
Mar 24, 1:57 PM EDT	Mesoscale Discussion	SPC	Lake, Orange, Seminole	63 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.