Alert archive / Georgia / Mesoscale Discussions in 2013

Mesoscale Discussion 541

April 19, 2013Hamilton County, Madison County, Taylor County, Florida; 11 counties in Georgia; 6 counties in South Carolina

The Storm Prediction Center issued this mesoscale discussion at Apr 19, 2013, 6:37 PM EDT for Hamilton County, Madison County, Taylor County, Florida; 11 counties in Georgia; 6 counties in South Carolina. It was in force for 113 min.

The area

The outline as issued.

The facts

Issued: Apr 19, 2013, 6:37 PM EDT (22:37 UTC)
Expired: Apr 19, 2013, 8:30 PM EDT
In force: 113 min
Issued by: the Storm Prediction Center

Counties Hamilton County, FL, Madison County, FL, Taylor County, FL, Brantley County, GA, Camden County, GA, Charlton County, GA, Chatham County, GA, Clinch County, GA, Echols County, GA, Glynn County, GA, Liberty County, GA, Lowndes County, GA, McIntosh County, GA, Ware County, GA, Beaufort County, SC, Berkeley County, SC, Charleston County, SC, Clarendon County, SC, Colleton County, SC, Dorchester County, SC

The radar

The Charleston,SC radar (KCLX), 92 km from the middle of the area, began a volume at 22:40 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, 10.6 hours before the alert went out and 157 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: 93 J/kg
Mixed-layer CIN: -84 J/kg
Mixed-layer LCL: 1102 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: -82 m²/s²
0-3 km storm-relative helicity: -53 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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
Apr 19, 11:42 AM EDT	Mesoscale Discussion	SPC	Bay, Calhoun, Franklin, Gadsden, Gulf, Hamilton and 9 more	3 hr
Apr 19, 12:37 PM EDT	Severe Thunderstorm Watch	SPC	Bay, Calhoun, Franklin, Gadsden, Gulf, Jackson and 6 more	6 hr
Apr 19, 1:57 PM EDT	Mesoscale Discussion	SPC	Alachua, Baker, Bradford, Calhoun, Clay, Columbia and 17 more	2 hr
Apr 19, 4:29 PM EDT	Mesoscale Discussion	SPC	Hamilton, Jefferson, Lafayette, Madison, Taylor, Wakulla	2 hr
Apr 19, 2:52 AM EDT	Mesoscale Discussion	SPC	Bartow, Carroll, Catoosa, Chattooga, Dade, Fannin and 10 more	83 min
Apr 19, 2:00 PM EDT	Tornado Watch	SPC	Elbert, Hart	7 hr
Apr 19, 2:36 PM EDT	Severe Thunderstorm Watch	SPC	Appling, Atkinson, Bacon, Brantley, Bryan, Bulloch and 20 more	7 hr
Apr 19, 12:35 PM EDT	Mesoscale Discussion	SPC	Abbeville, Anderson, Cherokee, Chester, Chesterfield, Darlington and 16 more	115 min
Apr 19, 4:48 PM EDT	Mesoscale Discussion	SPC	Chester, Chesterfield, Darlington, Dillon, Fairfield, Florence and 9 more	57 min
Apr 19, 6:27 PM EDT	Severe Thunderstorm Watch	SPC	Georgetown, Horry	4 hr
Apr 19, 6:54 PM EDT	Mesoscale Discussion	SPC	Dillon	66 min

Nearby

Mesoscale Discussions in Georgia, 2013 Mesoscale Discussions in South Carolina, 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.