Alert archive / Florida / Mesoscale Discussions in 2013

Mesoscale Discussion 474

April 14, 201310 counties in Florida

The Storm Prediction Center issued this mesoscale discussion at Apr 14, 2013, 6:44 PM EDT for 10 counties in Florida. It was in force for 91 min.

The area

The outline as issued.

The facts

Issued: Apr 14, 2013, 6:44 PM EDT (22:44 UTC)
Expired: Apr 14, 2013, 8:15 PM EDT
In force: 91 min
Issued by: the Storm Prediction Center

Counties Alachua County, FL, Dixie County, FL, Gilchrist County, FL, Lafayette County, FL, Lake County, FL, Marion County, FL, Orange County, FL, Putnam County, FL, Seminole County, FL, Volusia County, FL

The radar

The Jacksonville radar (KJAX), 148 km from the middle of the area, began a volume at 22:47 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, 10.7 hours before the alert went out and 169 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: 846 J/kg
Mixed-layer CIN: -106 J/kg
Mixed-layer LCL: 757 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 98 m²/s²
0-3 km storm-relative helicity: 115 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 1.1

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, 10:24 AM EDT	Mesoscale Discussion	SPC	Bay, Calhoun, Escambia, Gulf, Liberty, Okaloosa and 3 more	96 min
Apr 14, 10:57 AM EDT	Tornado Watch	SPC	Bay, Calhoun, Dixie, Escambia, Franklin, Gadsden and 14 more	8 hr
Apr 14, 1:03 PM EDT	Mesoscale Discussion	SPC	Glades, Hardee, Highlands, Lake, Marion, Okeechobee and 5 more	87 min
Apr 14, 1:52 PM EDT	Tornado Watch	SPC	Alachua, Baker, Bradford, Brevard, Citrus, Clay and 23 more	9 hr
Apr 14, 2:05 PM EDT	Mesoscale Discussion	SPC	Bay, Calhoun, Gadsden, Gulf, Jefferson, Leon and 3 more	85 min
Apr 14, 4:17 PM EDT	Mesoscale Discussion	SPC	Alachua, Baker, Bradford, Citrus, Clay, Columbia and 17 more	88 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.