Alert archive / Georgia / Mesoscale Discussions in 2013

Mesoscale Discussion 306

March 23, 20137 counties in Florida; 9 counties in Georgia

The Storm Prediction Center issued this mesoscale discussion at Mar 23, 2013, 4:33 PM EDT for 7 counties in Florida; 9 counties in Georgia. It was in force for 27 min.

The area

The outline as issued.

The facts

Issued: Mar 23, 2013, 4:33 PM EDT (20:33 UTC)
Expired: Mar 23, 2013, 5:00 PM EDT
In force: 27 min
Issued by: the Storm Prediction Center

Counties Baker County, FL, Bradford County, FL, Clay County, FL, Columbia County, FL, Duval County, FL, Nassau County, FL, Union County, FL, Bacon County, GA, Brantley County, GA, Camden County, GA, Charlton County, GA, Clinch County, GA, Echols County, GA, Pierce County, GA, Ware County, GA, Wayne County, GA

The radar

The Jacksonville radar (KJAX), 51 km from the middle of the area, began a volume at 20:32 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

Tallahassee Rgnl, FL (KTLH), launched 12:00Z, 8.6 hours before the alert went out and 213 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: 65 J/kg
Mixed-layer CIN: -355 J/kg
Mixed-layer LCL: 513 m above ground
0-6 km bulk shear: 70 kt
0-1 km storm-relative helicity: 225 m²/s²
0-3 km storm-relative helicity: 329 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 3.0

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 23, 8:38 AM EDT	Mesoscale Discussion	SPC	Bay, Calhoun, Escambia, Franklin, Gadsden, Gulf and 9 more	97 min
Mar 23, 10:54 AM EDT	Mesoscale Discussion	SPC	Alachua, Baker, Bradford, Clay, Columbia, Duval and 7 more	36 min
Mar 23, 10:59 AM EDT	Severe Thunderstorm Watch	SPC	Baker, Bradford, Clay, Columbia, Duval, Hamilton and 8 more	6 hr
Mar 23, 12:16 PM EDT	Mesoscale Discussion	SPC	Bay, Calhoun, Gadsden, Gulf, Holmes, Jackson and 6 more	89 min
Mar 23, 1:25 PM EDT	Mesoscale Discussion	SPC	Bradford, Clay, Columbia, Union	35 min
Mar 23, 1:35 PM EDT	Mesoscale Discussion	SPC	Escambia, Santa Rosa	85 min
Mar 23, 1:56 PM EDT	Severe Thunderstorm Watch	SPC	Bay, Calhoun, Dixie, Escambia, Franklin, Gadsden and 14 more	9 hr
Mar 23, 2:15 PM EDT	Mesoscale Discussion	SPC	Alachua, Brevard, Citrus, Hardee, Hernando, Hillsborough and 11 more	2 hr
Mar 23, 2:44 PM EDT	Mesoscale Discussion	SPC	Baker, Bradford, Clay, Columbia, Duval, Hamilton and 4 more	31 min
Mar 23, 3:52 PM EDT	Mesoscale Discussion	SPC	Bay, Calhoun, Escambia, Franklin, Gadsden, Gulf and 12 more	83 min
Mar 23, 6:22 PM EDT	Mesoscale Discussion	SPC	Bay, Calhoun, Escambia, Gadsden, Gulf, Holmes and 11 more	53 min

Nearby

Mesoscale Discussions in Georgia, 2013 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.