Alert archive / Florida / Mesoscale Discussions in 2013

Mesoscale Discussion 320

March 24, 201310 counties in Florida; 9 counties in Georgia

The Storm Prediction Center issued this mesoscale discussion at Mar 24, 2013, 10:09 AM EDT for 10 counties in Florida; 9 counties in Georgia. It was in force for 66 min.

The area

The outline as issued.

The facts

Issued: Mar 24, 2013, 10:09 AM EDT (14:09 UTC)
Expired: Mar 24, 2013, 11:15 AM EDT
In force: 66 min
Issued by: the Storm Prediction Center
Chance of a watch: 20%

Counties Alachua County, FL, Baker County, FL, Bradford County, FL, Clay County, FL, Duval County, FL, Levy County, FL, Nassau County, FL, Putnam County, FL, Saint Johns County, FL, Union County, FL, Brantley County, GA, Bryan County, GA, Camden County, GA, Charlton County, GA, Glynn County, GA, Liberty County, GA, Long County, GA, McIntosh County, GA, Wayne County, GA

The radar

The Jacksonville radar (KJAX), 35 km from the middle of the area, began a volume at 14:10 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

Jacksonville, FL (KJAX), launched 12:00Z, 2.2 hours before the alert went out and 34 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: 502 J/kg
Mixed-layer CIN: -74 J/kg
Mixed-layer LCL: 464 m above ground
0-6 km bulk shear: 56 kt
0-1 km storm-relative helicity: 465 m²/s²
0-3 km storm-relative helicity: 527 m²/s²
Significant tornado parameter: 1.2
Supercell composite: 12.3

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, 1:57 PM EDT	Mesoscale Discussion	SPC	Lake, Orange, Seminole	63 min
Mar 24, 5:35 PM EDT	Mesoscale Discussion	SPC	Charlotte, Glades, Highlands, Lee, Martin, Okeechobee and 1 more	115 min
Mar 23, 11:28 PM EDT	Mesoscale Discussion	SPC	Chattahoochee, Crawford, Crisp, Dooly, Harris, Heard and 19 more	92 min
Mar 24, 12:48 AM EDT	Severe Thunderstorm Watch	SPC	Baldwin, Barrow, Bibb, Bleckley, Butts, Carroll and 64 more	7 hr
Mar 24, 4:46 AM EDT	Mesoscale Discussion	SPC	Baldwin, Barrow, Bibb, Bleckley, Butts, Carroll and 65 more	89 min
Mar 24, 6:55 AM EDT	Mesoscale Discussion	SPC	Baldwin, Barrow, Bibb, Bleckley, Butts, Carroll and 54 more	65 min

Nearby

Mesoscale Discussions in Florida, 2013 Mesoscale Discussions in Georgia, 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.