Alert archive / Georgia / Mesoscale Discussions in 2019

Mesoscale Discussion 620

May 12, 20199 counties in Florida; 44 counties in Georgia; 9 counties in South Carolina

The Storm Prediction Center issued this mesoscale discussion at May 12, 2019, 3:04 PM EDT for 9 counties in Florida; 44 counties in Georgia; 9 counties in South Carolina. It was in force for 56 min.

The area

The outline as issued.

The facts

Issued: May 12, 2019, 3:04 PM EDT (19:04 UTC)
Expired: May 12, 2019, 4:00 PM EDT
In force: 56 min
Issued by: the Storm Prediction Center

All 62 counties

Baker County, FL, Columbia County, FL, Hamilton County, FL, Jefferson County, FL, Lafayette County, FL, Madison County, FL, Nassau County, FL, Suwannee County, FL, Taylor 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, Camden County, GA, Candler County, GA, Charlton County, GA, Chatham County, GA, Clinch County, GA, Coffee 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, Pulaski County, GA, Screven County, GA, Tattnall County, GA, Telfair County, GA, Tift County, GA, Toombs County, GA, Treutlen County, GA, Ware County, GA, Wayne County, GA, Wheeler County, GA, Wilcox County, GA, Allendale County, SC, Beaufort County, SC, Berkeley County, SC, Charleston County, SC, Colleton County, SC, Dorchester County, SC, Georgetown County, SC, Hampton County, SC, Jasper County, SC

The radar

The Moody AFB radar (KVAX), 44 km from the middle of the area, began a volume at 19:04 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, 7.1 hours before the alert went out and 175 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: 659 J/kg
Mixed-layer CIN: -37 J/kg
Mixed-layer LCL: 847 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 76 m²/s²
0-3 km storm-relative helicity: 112 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 2.6

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.

Issued	Product	Office	Counties	Lasted
May 12, 9:39 AM EDT	Mesoscale Discussion	SPC	Bay, Calhoun, Escambia, Franklin, Gadsden, Gulf and 9 more	2 hr
May 12, 9:59 AM EDT	Severe Thunderstorm Watch	SPC	Bay, Calhoun, Franklin, Gadsden, Gulf, Holmes and 6 more	5 hr
May 12, 12:11 PM EDT	Mesoscale Discussion	SPC	Baker, Bay, Calhoun, Columbia, Franklin, Gadsden and 12 more	64 min
May 12, 12:41 PM EDT	Severe Thunderstorm Watch	SPC	Hamilton, Jefferson, Madison	6 hr
May 12, 4:23 PM EDT	Mesoscale Discussion	SPC	Baker, Columbia, Hamilton, Nassau	2 hr
May 12, 11:50 AM EDT	Mesoscale Discussion	SPC	Bryan, Chatham, Effingham, Evans, Liberty, Tattnall	85 min

Nearby

Mesoscale Discussions in Georgia, 2019 Mesoscale Discussions in Florida, 2019 Mesoscale Discussions in South Carolina, 2019 Every mesoscale discussion in 2019

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.