Alert archive / Georgia / Mesoscale Discussions in 2017

Mesoscale Discussion 118

January 22, 20174 counties in Alabama; 16 counties in Georgia

The Storm Prediction Center issued this mesoscale discussion at Jan 22, 2017, 2:28 PM CST for 4 counties in Alabama; 16 counties in Georgia. It was in force for 92 min.

The area

The outline as issued.

The facts

Issued: Jan 22, 2017, 2:28 PM CST (20:28 UTC)
Expired: Jan 22, 2017, 4:00 PM CST
In force: 92 min
Issued by: the Storm Prediction Center

Counties Chambers County, AL, Clay County, AL, Lee County, AL, Randolph County, AL, Carroll County, GA, Chattahoochee County, GA, Clayton County, GA, Coweta County, GA, Douglas County, GA, Fayette County, GA, Harris County, GA, Heard County, GA, Lamar County, GA, Meriwether County, GA, Muscogee County, GA, Pike County, GA, Spalding County, GA, Talbot County, GA, Troup County, GA, Upson County, GA

The radar

The Atlanta radar (KFFC), 45 km from the middle of the area, began a volume at 20:28 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

Peachtre/Fal Fld, GA (KFFC), launched 12:00Z, 8.5 hours before the alert went out and 51 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: 189 J/kg
Mixed-layer CIN: -133 J/kg
Mixed-layer LCL: 609 m above ground
0-6 km bulk shear: 71 kt
0-1 km storm-relative helicity: 355 m²/s²
0-3 km storm-relative helicity: 423 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.9

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
Jan 21, 6:05 PM CST	Mesoscale Discussion	SPC	Mobile	85 min
Jan 21, 6:51 PM CST	Tornado Watch PDS	SPC	Autauga, Baldwin, Barbour, Bibb, Bullock, Butler and 36 more	8 hr
Jan 21, 8:30 PM CST	Mesoscale Discussion	SPC	Autauga, Baldwin, Barbour, Bibb, Bullock, Butler and 34 more	90 min
Jan 21, 9:57 PM CST	Mesoscale Discussion	SPC	Autauga, Barbour, Bibb, Bullock, Butler, Chilton and 29 more	93 min
Jan 21, 11:49 PM CST	Mesoscale Discussion	SPC	Autauga, Barbour, Bibb, Bullock, Butler, Chilton and 30 more	116 min
Jan 22, 1:55 AM CST	Mesoscale Discussion	SPC	Henry, Houston	65 min
Jan 22, 2:20 AM CST	Tornado Watch	SPC	Henry, Houston	9 hr
Jan 22, 2:46 AM CST	Mesoscale Discussion	SPC	Barbour, Bullock, Chambers, Clay, Coosa, Crenshaw and 9 more	119 min
Jan 22, 5:34 AM CST	Mesoscale Discussion	SPC	Houston	86 min
Jan 22, 7:43 AM CST	Mesoscale Discussion	SPC	Baldwin, Barbour, Butler, Clarke, Coffee, Conecuh and 9 more	2 hr
Jan 22, 8:06 AM CST	Tornado Watch	SPC	Baldwin, Butler, Coffee, Conecuh, Covington, Crenshaw and 8 more	5 hr
Jan 22, 9:16 AM CST	Mesoscale Discussion	SPC	Escambia	59 min
Jan 22, 11:02 AM CST	Mesoscale Discussion	SPC	Geneva, Houston	58 min
Jan 22, 11:47 AM CST	Tornado Watch PDS	SPC	Autauga, Barbour, Bullock, Chambers, Chilton, Coffee and 13 more	7 hr
Jan 22, 12:31 PM CST	Mesoscale Discussion	SPC	Bullock, Chambers, Elmore, Lee, Macon, Montgomery and 2 more	59 min
Jan 21, 11:06 PM CST	Mesoscale Discussion	SPC	Appling, Bacon, Ben Hill, Bibb, Bleckley, Brantley and 34 more	54 min
Jan 22, 6:11 AM CST	Mesoscale Discussion	SPC	Appling, Atkinson, Bacon, Baker, Ben Hill, Berrien and 49 more	2 hr
Jan 22, 8:11 AM CST	Mesoscale Discussion	SPC	Brantley, Brooks, Camden, Charlton, Clinch, Decatur and 7 more	64 min
Jan 22, 9:41 AM CST	Mesoscale Discussion	SPC	Baldwin, Bibb, Bleckley, Butts, Crawford, Dodge and 27 more	94 min
Jan 22, 10:25 AM CST	Mesoscale Discussion	SPC	Appling, Atkinson, Bacon, Baker, Ben Hill, Berrien and 31 more	95 min
Jan 22, 12:36 PM CST	Mesoscale Discussion	SPC	Decatur, Grady, Miller, Seminole, Thomas	54 min
Jan 22, 2:02 PM CST	Mesoscale Discussion	SPC	Baker, Ben Hill, Berrien, Brooks, Calhoun, Colquitt and 15 more	58 min
Jan 22, 3:02 PM CST	Mesoscale Discussion	SPC	Bryan, Bulloch, Burke, Candler, Chatham, Effingham and 8 more	88 min
Jan 22, 3:19 PM CST	Mesoscale Discussion	SPC	Atkinson, Bacon, Ben Hill, Berrien, Charlton, Clinch and 12 more	86 min
Jan 22, 3:25 PM CST	Tornado Watch PDS	SPC	Bryan, Bulloch, Burke, Candler, Chatham, Columbia and 10 more	3 hr
Jan 22, 5:58 PM CST	Mesoscale Discussion	SPC	Brantley, Bryan, Bulloch, Burke, Candler, Chatham and 11 more	92 min

Nearby

Mesoscale Discussions in Georgia, 2017 Mesoscale Discussions in Alabama, 2017 Every 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.