Alert archive / Georgia / Mesoscale Discussions in 2013

Mesoscale Discussion 536

April 19, 20136 counties in Florida; 40 counties in Georgia; 15 counties in South Carolina

The Storm Prediction Center issued this mesoscale discussion at Apr 19, 2013, 4:29 PM EDT for 6 counties in Florida; 40 counties in Georgia; 15 counties in South Carolina. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Apr 19, 2013, 4:29 PM EDT (20:29 UTC)
Expired
Apr 19, 2013, 6:30 PM EDT
In force
2 hr
Issued by
the Storm Prediction Center
All 61 counties

Hamilton County, FL, Jefferson County, FL, Lafayette County, FL, Madison County, FL, Taylor County, FL, Wakulla County, FL, Appling County, GA, Atkinson County, GA, Bacon County, GA, Ben Hill County, GA, Berrien County, GA, Brantley County, GA, Brooks County, GA, Bryan County, GA, Bulloch County, GA, Burke County, GA, Camden County, GA, Candler County, GA, Charlton County, GA, Chatham County, GA, Clinch County, GA, Coffee County, GA, Cook County, GA, Echols County, GA, Effingham County, GA, Emanuel County, GA, Evans County, GA, Glynn County, GA, Irwin County, GA, Jeff Davis County, GA, Jenkins County, GA, Lanier County, GA, Liberty County, GA, Long County, GA, Lowndes County, GA, McIntosh County, GA, Montgomery County, GA, Pierce County, GA, Screven County, GA, Tattnall County, GA, Telfair County, GA, Toombs County, GA, Treutlen County, GA, Ware County, GA, Wayne County, GA, Wheeler County, GA, Aiken County, SC, Allendale County, SC, Bamberg County, SC, Barnwell County, SC, Beaufort County, SC, Berkeley County, SC, Calhoun County, SC, Charleston County, SC, Clarendon County, SC, Colleton County, SC, Dorchester County, SC, Hampton County, SC, Jasper County, SC, Lexington County, SC, Orangeburg County, SC

The nearest sounding before it

Jacksonville, FL (KJAX), launched 12:00Z, 8.5 hours before the alert went out and 92 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-pSkew-T log-p diagram, Jacksonville, FL at 12:00Z on 2013-04-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 93 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Jacksonville, FL at 12:00Z on 2013-04-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -82 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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.

IssuedProductOfficeCountiesLasted
Apr 19, 11:42 AM EDTMesoscale DiscussionSPCBay, Calhoun, Franklin, Gadsden, Gulf, Hamilton and 9 more3 hr
Apr 19, 12:37 PM EDTSevere Thunderstorm WatchSPCBay, Calhoun, Franklin, Gadsden, Gulf, Jackson and 6 more6 hr
Apr 19, 1:57 PM EDTMesoscale DiscussionSPCAlachua, Baker, Bradford, Calhoun, Clay, Columbia and 17 more2 hr
Apr 19, 6:37 PM EDTMesoscale DiscussionSPCHamilton, Madison, Taylor113 min
Apr 19, 2:52 AM EDTMesoscale DiscussionSPCBartow, Carroll, Catoosa, Chattooga, Dade, Fannin and 10 more83 min
Apr 19, 2:00 PM EDTTornado WatchSPCElbert, Hart7 hr
Apr 19, 2:36 PM EDTSevere Thunderstorm WatchSPCAppling, Atkinson, Bacon, Brantley, Bryan, Bulloch and 20 more7 hr
Apr 19, 12:35 PM EDTMesoscale DiscussionSPCAbbeville, Anderson, Cherokee, Chester, Chesterfield, Darlington and 16 more115 min
Apr 19, 4:48 PM EDTMesoscale DiscussionSPCChester, Chesterfield, Darlington, Dillon, Fairfield, Florence and 9 more57 min
Apr 19, 6:27 PM EDTSevere Thunderstorm WatchSPCGeorgetown, Horry4 hr
Apr 19, 6:54 PM EDTMesoscale DiscussionSPCDillon66 min

Nearby

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