Alert archive / Georgia / Mesoscale Discussions in 2017

Mesoscale Discussion 439

April 5, 201751 counties in Georgia; 12 counties in South Carolina

The Storm Prediction Center issued this mesoscale discussion at Apr 5, 2017, 10:25 AM EDT for 51 counties in Georgia; 12 counties in South Carolina. It was in force for 95 min.

The area

The outline as issued.

The facts

Issued
Apr 5, 2017, 10:25 AM EDT (14:25 UTC)
Expired
Apr 5, 2017, 12:00 PM EDT
In force
95 min
Issued by
the Storm Prediction Center
Chance of a watch
40%
All 63 counties

Baldwin County, GA, Banks County, GA, Barrow County, GA, Bartow County, GA, Burke County, GA, Butts County, GA, Carroll County, GA, Cherokee County, GA, Clarke County, GA, Clayton County, GA, Cobb County, GA, Columbia County, GA, Coweta County, GA, DeKalb County, GA, Douglas County, GA, Elbert County, GA, Fayette County, GA, Forsyth County, GA, Fulton County, GA, Glascock County, GA, Greene County, GA, Gwinnett County, GA, Hall County, GA, Hancock County, GA, Hart County, GA, Heard County, GA, Henry County, GA, Jackson County, GA, Jasper County, GA, Jefferson County, GA, Jones County, GA, Lamar County, GA, Lincoln County, GA, Madison County, GA, McDuffie County, GA, Monroe County, GA, Morgan County, GA, Newton County, GA, Oconee County, GA, Oglethorpe County, GA, Paulding County, GA, Pike County, GA, Putnam County, GA, Richmond County, GA, Rockdale County, GA, Spalding County, GA, Taliaferro County, GA, Walton County, GA, Warren County, GA, Washington County, GA, Wilkes County, GA, Abbeville County, SC, Aiken County, SC, Allendale County, SC, Bamberg County, SC, Barnwell County, SC, Calhoun County, SC, Edgefield County, SC, Greenwood County, SC, Lexington County, SC, McCormick County, SC, Orangeburg County, SC, Saluda County, SC

The radar

The Robins AFB radar (KJGX), 113 km from the middle of the area, began a volume at 14:25 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 12:00Z, 2.4 hours before the alert went out and 137 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 12:00Z on 2017-04-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 703 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 12:00Z on 2017-04-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 320 square meters per square second.1939587897117Sfc1 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
703 J/kg
Mixed-layer CIN
-129 J/kg
Mixed-layer LCL
624 m above ground
0-6 km bulk shear
71 kt
0-1 km storm-relative helicity
320 m²/s²
0-3 km storm-relative helicity
264 m²/s²
Significant tornado parameter
0.0
Supercell composite
4.2

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
Apr 5, 2:37 AM EDTSevere Thunderstorm WatchSPCBaker, Ben Hill, Bibb, Butts, Calhoun, Carroll and 51 more6 hr
Apr 5, 4:41 AM EDTMesoscale DiscussionSPCBaker, Bibb, Bleckley, Butts, Calhoun, Carroll and 49 more2 hr
Apr 5, 7:15 AM EDTMesoscale DiscussionSPCCalhoun, Carroll, Chattahoochee, Clay, Clayton, Cobb and 26 more90 min
Apr 5, 7:54 AM EDTTornado WatchSPCBaker, Barrow, Bartow, Bibb, Bleckley, Butts and 66 more8 hr
Apr 5, 10:43 AM EDTMesoscale DiscussionSPCBaldwin, Ben Hill, Bibb, Bleckley, Bulloch, Burke and 69 more2 hr
Apr 5, 11:38 AM EDTMesoscale DiscussionSPCAppling, Atkinson, Bacon, Baker, Ben Hill, Berrien and 52 more97 min
Apr 5, 12:54 PM EDTTornado Watch PDSSPCAppling, Atkinson, Bacon, Baker, Baldwin, Ben Hill and 93 more10 hr
Apr 5, 2:02 PM EDTMesoscale DiscussionSPCDade, Walker2 hr
Apr 5, 2:50 PM EDTTornado WatchSPCBartow, Carroll, Catoosa, Chattooga, Cherokee, Clayton and 26 more8 hr
Apr 5, 3:12 PM EDTMesoscale DiscussionSPCAppling, Bacon, Baker, Baldwin, Ben Hill, Berrien and 80 more93 min
Apr 5, 4:51 PM EDTMesoscale DiscussionSPCBartow, Carroll, Catoosa, Chattooga, Dade, Douglas and 10 more84 min
Apr 5, 6:29 PM EDTMesoscale DiscussionSPCAppling, Atkinson, Bacon, Berrien, Brantley, Brooks and 22 more61 min
Apr 5, 7:57 PM EDTMesoscale DiscussionSPCBarrow, Bartow, Butts, Carroll, Catoosa, Chattahoochee and 46 more48 min
Apr 5, 2:02 PM EDTMesoscale DiscussionSPCDarlington, Dillon, Florence, Lee, Marion, Williamsburg58 min
Apr 5, 2:45 PM EDTTornado WatchSPCDarlington, Dillon, Florence, Georgetown, Horry, Marion and 2 more5 hr
Apr 5, 4:23 PM EDTMesoscale DiscussionSPCBerkeley, Darlington, Dillon, Florence, Georgetown, Horry and 2 more97 min

Nearby

Mesoscale Discussions in Georgia, 2017Mesoscale Discussions in South Carolina, 2017Every mesoscale discussion in 2017

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.