Alert archive / Florida / Mesoscale Discussions in 2014

Mesoscale Discussion 493

April 30, 20149 counties in Florida

The Storm Prediction Center issued this mesoscale discussion at Apr 30, 2014, 2:16 PM EDT for 9 counties in Florida. It was in force for 119 min.

The area

The outline as issued.

The facts

Issued: Apr 30, 2014, 2:16 PM EDT (18:16 UTC)
Expired: Apr 30, 2014, 4:15 PM EDT
In force: 119 min
Issued by: the Storm Prediction Center
Chance of a watch: 5%

Counties Citrus County, FL, Flagler County, FL, Hernando County, FL, Lake County, FL, Marion County, FL, Putnam County, FL, Saint Johns County, FL, Sumter County, FL, Volusia County, FL

The radar

The Tampa radar (KTBW), 158 km from the middle of the area, began a volume at 18:15 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, 6.3 hours before the alert went out and 160 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: 1224 J/kg
Mixed-layer CIN: -72 J/kg
Mixed-layer LCL: 937 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 32 m²/s²
0-3 km storm-relative helicity: 33 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 1.5

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 29, 10:01 PM EDT	Mesoscale Discussion	SPC	Escambia, Okaloosa, Santa Rosa	59 min
Apr 29, 10:56 PM EDT	Tornado Watch	SPC	Bay, Gulf, Holmes, Walton, Washington	4 hr
Apr 30, 12:29 AM EDT	Mesoscale Discussion	SPC	Bay, Holmes, Walton, Washington	2 hr
Apr 30, 1:45 AM EDT	Tornado Watch	SPC	Bay, Calhoun, Franklin, Gadsden, Gulf, Holmes and 7 more	8 hr
Apr 30, 2:39 AM EDT	Mesoscale Discussion	SPC	Bay, Calhoun, Gadsden, Jackson, Leon, Liberty	96 min
Apr 30, 5:15 AM EDT	Mesoscale Discussion	SPC	Bay, Calhoun, Escambia, Gadsden, Gulf, Jefferson and 8 more	2 hr
Apr 30, 7:17 AM EDT	Mesoscale Discussion	SPC	Franklin, Gulf, Liberty, Wakulla	88 min
Apr 30, 9:58 AM EDT	Mesoscale Discussion	SPC	Dixie, Franklin, Jefferson, Lafayette, Leon, Liberty and 2 more	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.