Alert archive / Florida / Mesoscale Discussions in 2011

Mesoscale Discussion 319

March 30, 20117 counties in Florida

The Storm Prediction Center issued this mesoscale discussion at Mar 30, 2011, 4:41 PM EDT for 7 counties in Florida. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Mar 30, 2011, 4:41 PM EDT (20:41 UTC)
Expired: Mar 30, 2011, 6:45 PM EDT
In force: 2 hr
Issued by: the Storm Prediction Center

Counties Brevard County, FL, Flagler County, FL, Orange County, FL, Osceola County, FL, Polk County, FL, Seminole County, FL, Volusia County, FL

The radar

The Melbourne radar (KMLB), 81 km from the middle of the area, began a volume at 20:41 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

Cape Canaveral, FL (KXMR), launched 12:00Z, 8.7 hours before the alert went out and 83 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: 305 J/kg
Mixed-layer CIN: -60 J/kg
Mixed-layer LCL: 800 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 92 m²/s²
0-3 km storm-relative helicity: 200 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 1.7

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 30, 2:51 AM EDT	Mesoscale Discussion	SPC	Escambia, Okaloosa, Santa Rosa, Walton	114 min
Mar 30, 5:07 AM EDT	Tornado Watch	SPC	Bay, Calhoun, Escambia, Franklin, Gulf, Holmes and 6 more	6 hr
Mar 30, 8:28 AM EDT	Mesoscale Discussion	SPC	Alachua, Baker, Bay, Bradford, Calhoun, Clay and 26 more	2 hr
Mar 30, 11:10 AM EDT	Tornado Watch	SPC	Alachua, Baker, Bradford, Brevard, Citrus, Clay and 27 more	8 hr
Mar 30, 3:32 PM EDT	Mesoscale Discussion	SPC	Alachua, Baker, Bradford, Citrus, Clay, Columbia and 17 more	58 min

Nearby

Mesoscale Discussions in Florida, 2011 Every mesoscale discussion in 2011

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.