Alert archive / Georgia / Mesoscale Discussions in 2016

Mesoscale Discussion 1618

September 2, 201624 counties in Florida; 47 counties in Georgia; 4 counties in South Carolina

The Storm Prediction Center issued this mesoscale discussion at Sep 2, 2016, 12:45 AM EDT for 24 counties in Florida; 47 counties in Georgia; 4 counties in South Carolina. It was in force for 4 hr.

The area

The outline as issued.

The facts

Issued
Sep 2, 2016, 12:45 AM EDT (04:45 UTC)
Expired
Sep 2, 2016, 4:45 AM EDT
In force
4 hr
Issued by
the Storm Prediction Center
All 75 counties

Alachua County, FL, Baker County, FL, Bradford County, FL, Citrus County, FL, Clay County, FL, Columbia County, FL, Dixie County, FL, Duval County, FL, Gilchrist County, FL, Hamilton County, FL, Hernando County, FL, Jefferson County, FL, Lafayette County, FL, Levy County, FL, Madison County, FL, Marion County, FL, Nassau County, FL, Putnam County, FL, Saint Johns County, FL, Sumter County, FL, Suwannee County, FL, Taylor County, FL, Union 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, Colquitt County, GA, Cook County, GA, Dodge 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, Laurens 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, Thomas County, GA, Tift County, GA, Toombs County, GA, Treutlen County, GA, Turner County, GA, Ware County, GA, Wayne County, GA, Wheeler County, GA, Wilcox County, GA, Allendale County, SC, Beaufort County, SC, Hampton County, SC, Jasper County, SC

The radar

The Moody AFB radar (KVAX), 55 km from the middle of the area, began a volume at 04:46 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

Cape Canaveral, FL (KXMR), launched 00:00Z, 4.8 hours before the alert went out and 307 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, Cape Canaveral, FL at 00:00Z on 2016-09-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1297 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, Cape Canaveral, FL at 00:00Z on 2016-09-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 223 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
1297 J/kg
Mixed-layer CIN
-29 J/kg
Mixed-layer LCL
853 m above ground
0-6 km bulk shear
32 kt
0-1 km storm-relative helicity
223 m²/s²
0-3 km storm-relative helicity
257 m²/s²
Significant tornado parameter
0.0
Supercell composite
4.1

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Sep 1, 10:01 PM EDTMesoscale DiscussionSPCAlachua, Baker, Bradford, Citrus, Clay, Columbia and 15 more2 hr
Sep 1, 10:47 PM EDTTornado WatchSPCAlachua, Baker, Bradford, Citrus, Clay, Columbia and 20 more9 hr
Sep 2, 5:05 AM EDTMesoscale DiscussionSPCBryan, Bulloch, Chatham, Effingham, Liberty2 hr
Sep 2, 7:51 AM EDTTornado WatchSPCBryan, Bulloch, Candler, Chatham, Effingham, Evans and 6 more8 hr
Sep 2, 12:55 PM EDTMesoscale DiscussionSPCBryan, Bulloch, Chatham, Effingham, Evans, Liberty and 3 more2 hr
Sep 2, 3:29 PM EDTMesoscale DiscussionSPCGeorgetown, Horry, Williamsburg3 hr
Sep 2, 3:45 PM EDTTornado WatchSPCFlorence, Georgetown, Horry, Marion, Williamsburg11 hr

Nearby

Mesoscale Discussions in Georgia, 2016Mesoscale Discussions in Florida, 2016Mesoscale Discussions in South Carolina, 2016Every mesoscale discussion in 2016

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.