Alert archive / Florida / Mesoscale Discussions in 2014

Mesoscale Discussion 360

April 15, 201419 counties in Florida

The Storm Prediction Center issued this mesoscale discussion at Apr 15, 2014, 12:29 PM EDT for 19 counties in Florida. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued: Apr 15, 2014, 12:29 PM EDT (16:29 UTC)
Expired: Apr 15, 2014, 3:00 PM EDT
In force: 3 hr
Issued by: the Storm Prediction Center
Chance of a watch: 20%

Counties Brevard County, FL, Citrus County, FL, Flagler County, FL, Hardee County, FL, Hernando County, FL, Hillsborough County, FL, Lake County, FL, Manatee County, FL, Marion County, FL, Orange County, FL, Osceola County, FL, Pasco County, FL, Pinellas County, FL, Polk County, FL, Putnam County, FL, Saint Johns County, FL, Seminole County, FL, Sumter County, FL, Volusia County, FL

The radar

The Melbourne radar (KMLB), 101 km from the middle of the area, began a volume at 16:30 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, 4.5 hours before the alert went out and 105 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1017 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 40 m²/s²
0-3 km storm-relative helicity: 50 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

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 14, 8:00 PM EDT	Mesoscale Discussion	SPC	Bay, Escambia, Holmes, Okaloosa, Santa Rosa, Walton and 1 more	60 min
Apr 14, 8:49 PM EDT	Severe Thunderstorm Watch	SPC	Bay, Calhoun, Escambia, Franklin, Gadsden, Gulf and 7 more	6 hr
Apr 14, 10:45 PM EDT	Mesoscale Discussion	SPC	Bay, Calhoun, Escambia, Gadsden, Holmes, Jackson and 6 more	60 min
Apr 15, 2:30 AM EDT	Mesoscale Discussion	SPC	Bay, Calhoun, Franklin, Gadsden, Gulf, Holmes and 10 more	60 min
Apr 15, 4:58 AM EDT	Mesoscale Discussion	SPC	Calhoun, Jefferson, Leon, Liberty	62 min

Nearby

Mesoscale Discussions in Florida, 2014 Every mesoscale discussion in 2014

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.