Alert archive / Georgia / Mesoscale Discussions in 2017

Mesoscale Discussion 450

April 5, 201728 counties in Georgia; 5 counties in South Carolina

The Storm Prediction Center issued this mesoscale discussion at Apr 5, 2017, 6:29 PM EDT for 28 counties in Georgia; 5 counties in South Carolina. It was in force for 61 min.

The area

The outline as issued.

The facts

Issued
Apr 5, 2017, 6:29 PM EDT (22:29 UTC)
Expired
Apr 5, 2017, 7:30 PM EDT
In force
61 min
Issued by
the Storm Prediction Center
All 33 counties

Appling County, GA, Atkinson County, GA, Bacon County, GA, Berrien County, GA, Brantley County, GA, Brooks County, GA, Bryan County, GA, Camden County, GA, Charlton County, GA, Chatham County, GA, Clinch County, GA, Coffee County, GA, Cook County, GA, Echols County, GA, Effingham County, GA, Evans County, GA, Glynn County, GA, Jeff Davis County, GA, Lanier County, GA, Liberty County, GA, Long County, GA, Lowndes County, GA, McIntosh County, GA, Pierce County, GA, Tattnall County, GA, Thomas County, GA, Ware County, GA, Wayne County, GA, Beaufort County, SC, Berkeley County, SC, Colleton County, SC, Georgetown County, SC, Jasper County, SC

The radar

The Charleston,SC radar (KCLX), 132 km from the middle of the area, began a volume at 22:30 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

Jacksonville, FL (KJAX), launched 12:00Z, 10.5 hours before the alert went out and 134 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, Jacksonville, FL at 12:00Z on 2017-04-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1209 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, Jacksonville, FL at 12:00Z on 2017-04-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 68 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
1209 J/kg
Mixed-layer CIN
-170 J/kg
Mixed-layer LCL
925 m above ground
0-6 km bulk shear
32 kt
0-1 km storm-relative helicity
68 m²/s²
0-3 km storm-relative helicity
75 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
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, 10:25 AM EDTMesoscale DiscussionSPCBaldwin, Banks, Barrow, Bartow, Burke, Butts and 45 more95 min
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, 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.