Alert archive / Georgia / Mesoscale Discussions in 2020

Mesoscale Discussion 1822

November 30, 202017 counties in Florida; 22 counties in Georgia

The Storm Prediction Center issued this mesoscale discussion at Nov 30, 2020, 1:56 AM EST for 17 counties in Florida; 22 counties in Georgia. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued: Nov 30, 2020, 1:56 AM EST (06:56 UTC)
Expired: Nov 30, 2020, 4:30 AM EST
In force: 3 hr
Issued by: the Storm Prediction Center
Concerning: Severe potential...watch possible
Chance of a watch: 40%

All 39 counties

Alachua County, FL, Baker County, FL, Bradford County, FL, Columbia County, FL, Dixie County, FL, Gadsden County, FL, Gilchrist County, FL, Hamilton County, FL, Jefferson County, FL, Lafayette County, FL, Leon County, FL, Liberty County, FL, Madison County, FL, Suwannee County, FL, Taylor County, FL, Union County, FL, Wakulla County, FL, Atkinson County, GA, Baker County, GA, Berrien County, GA, Brooks County, GA, Charlton County, GA, Clinch County, GA, Coffee County, GA, Colquitt County, GA, Cook County, GA, Decatur County, GA, Dougherty County, GA, Echols County, GA, Grady County, GA, Irwin County, GA, Lanier County, GA, Lowndes County, GA, Mitchell County, GA, Thomas County, GA, Tift County, GA, Turner County, GA, Ware County, GA, Worth County, GA

The radar

The Tallahassee radar (KTLH), 57 km from the middle of the area, began a volume at 07:00 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 00:00Z, 6.9 hours before the alert went out and 55 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: 7 J/kg
Mixed-layer CIN: -68 J/kg
Mixed-layer LCL: 628 m above ground
0-6 km bulk shear: 70 kt
0-1 km storm-relative helicity: 365 m²/s²
0-3 km storm-relative helicity: 478 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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
Nov 29, 8:05 PM EST	Mesoscale Discussion	SPC	Bay, Calhoun, Gulf, Holmes, Jackson, Liberty and 2 more	115 min

Nearby

Mesoscale Discussions in Georgia, 2020 Mesoscale Discussions in Florida, 2020 Every mesoscale discussion in 2020

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.