Alert archive / Georgia / Mesoscale Discussions in 2018

Mesoscale Discussion 150

March 19, 201846 counties in Georgia

The Storm Prediction Center issued this mesoscale discussion at Mar 19, 2018, 8:45 PM EDT for 46 counties in Georgia. It was in force for 60 min.

The area

The outline as issued.

The facts

Issued
Mar 19, 2018, 8:45 PM EDT (00:45 UTC)
Expired
Mar 19, 2018, 9:45 PM EDT
In force
60 min
Issued by
the Storm Prediction Center
Chance of a watch
95%
All 46 counties

Baldwin County, GA, Bartow County, GA, Bibb County, GA, Butts County, GA, Carroll County, GA, Chattooga County, GA, Cherokee County, GA, Clayton County, GA, Cobb County, GA, Coweta County, GA, Crawford County, GA, DeKalb County, GA, Douglas County, GA, Fayette County, GA, Floyd County, GA, Fulton County, GA, Glascock County, GA, Gordon County, GA, Greene County, GA, Gwinnett County, GA, Hancock County, GA, Haralson County, GA, Heard County, GA, Henry County, GA, Jasper County, GA, Johnson County, GA, Jones County, GA, Lamar County, GA, Meriwether County, GA, Monroe County, GA, Morgan County, GA, Newton County, GA, Oconee County, GA, Paulding County, GA, Pike County, GA, Polk County, GA, Putnam County, GA, Rockdale County, GA, Spalding County, GA, Taliaferro County, GA, Twiggs County, GA, Upson County, GA, Walton County, GA, Warren County, GA, Washington County, GA, Wilkinson County, GA

The radar

The Atlanta radar (KFFC), 43 km from the middle of the area, began a volume at 00:48 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

The nearest sounding before it

Peachtre/Fal Fld, GA (KFFC), launched 00:00Z, 0.8 hours before the alert went out and 39 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, Peachtre/Fal Fld, GA at 00:00Z on 2018-03-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 184 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, Peachtre/Fal Fld, GA at 00:00Z on 2018-03-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 157 square meters per square second.1939587897Sfc1 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
184 J/kg
Mixed-layer CIN
-90 J/kg
Mixed-layer LCL
630 m above ground
0-6 km bulk shear
68 kt
0-1 km storm-relative helicity
157 m²/s²
0-3 km storm-relative helicity
258 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.2

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
Mar 19, 9:08 PM EDTTornado WatchSPCBaldwin, Barrow, Bartow, Bibb, Butts, Carroll and 48 more7 hr
Mar 19, 9:51 PM EDTMesoscale DiscussionSPCCarroll, Douglas, Haralson, Paulding, Polk84 min
Mar 20, 12:32 AM EDTMesoscale DiscussionSPCBulloch, Burke, Candler, Columbia, Effingham, Jenkins and 2 more88 min
Mar 20, 1:51 AM EDTSevere Thunderstorm WatchSPCBryan, Bulloch, Burke, Candler, Chatham, Columbia and 16 more4 hr
Mar 20, 2:36 AM EDTMesoscale DiscussionSPCBaldwin, Bibb, Crawford, Glascock, Harris, Jefferson and 12 more84 min
Mar 20, 4:54 AM EDTMesoscale DiscussionSPCBryan, Bulloch, Candler, Chatham, Effingham, Emanuel and 12 more96 min
Mar 20, 9:50 AM EDTMesoscale DiscussionSPCCamden, Charlton55 min
Mar 20, 10:24 AM EDTTornado WatchSPCCamden, Charlton9 hr
Mar 20, 12:05 PM EDTMesoscale DiscussionSPCAppling, Atkinson, Bacon, Brantley, Bryan, Bulloch and 23 more55 min
Mar 20, 12:43 PM EDTTornado WatchSPCAppling, Bacon, Brantley, Bryan, Bulloch, Charlton and 13 more7 hr
Mar 20, 1:00 PM EDTMesoscale DiscussionSPCCamden, Charlton, Echols60 min
Mar 20, 2:48 PM EDTMesoscale DiscussionSPCBrantley, Bryan, Camden, Charlton, Chatham, Clinch and 9 more87 min
Mar 20, 4:16 PM EDTMesoscale DiscussionSPCCamden, Charlton, Echols89 min
Mar 20, 6:10 PM EDTMesoscale DiscussionSPCChatham, Glynn, McIntosh65 min

Nearby

Mesoscale Discussions in Georgia, 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.