Alert archive / Georgia / Mesoscale Discussions in 2018

Mesoscale Discussion 1640

November 12, 20189 counties in Florida; 10 counties in Georgia

The Storm Prediction Center issued this mesoscale discussion at Nov 12, 2018, 6:26 PM CST for 9 counties in Florida; 10 counties in Georgia. It was in force for 34 min.

The area

The outline as issued.

The facts

Issued
Nov 12, 2018, 6:26 PM CST (00:26 UTC)
Expired
Nov 12, 2018, 7:00 PM CST
In force
34 min
Issued by
the Storm Prediction Center

Counties Bay County, FL, Calhoun County, FL, Franklin County, FL, Gadsden County, FL, Gulf County, FL, Jackson County, FL, Leon County, FL, Liberty County, FL, Wakulla County, FL, Baker County, GA, Calhoun County, GA, Decatur County, GA, Dougherty County, GA, Grady County, GA, Lee County, GA, Miller County, GA, Mitchell County, GA, Seminole County, GA, Terrell County, GA

The radar

The Tallahassee radar (KTLH), 72 km from the middle of the area, began a volume at 00:28 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, 0.4 hours before the alert went out and 75 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, Tallahassee Rgnl, FL at 00:00Z on 2018-11-13Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 516 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, Tallahassee Rgnl, FL at 00:00Z on 2018-11-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 187 square meters per square second.19395878Sfc1 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
516 J/kg
Mixed-layer CIN
-50 J/kg
Mixed-layer LCL
622 m above ground
0-6 km bulk shear
38 kt
0-1 km storm-relative helicity
187 m²/s²
0-3 km storm-relative helicity
198 m²/s²
Significant tornado parameter
0.4
Supercell composite
3.4

Open this sounding in Storm Lab

The text

As transmitted.

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Nearby

Mesoscale Discussions in Georgia, 2018Mesoscale Discussions in Florida, 2018Every mesoscale discussion in 2018

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.