Alert archive / Georgia / Severe Thunderstorm Watches in 2018

Severe Thunderstorm Watch 231

June 28, 201838 counties in Alabama; 55 counties in Georgia; 31 counties in Tennessee

The Storm Prediction Center issued this severe thunderstorm watch at Jun 28, 2018, 10:46 AM CDT for 38 counties in Alabama; 55 counties in Georgia; 31 counties in Tennessee. It was in force for 8 hr.

The area

The outline as issued.

The facts

Issued: Jun 28, 2018, 10:46 AM CDT (15:46 UTC)
Expired: Jun 28, 2018, 6:54 PM CDT
In force: 8 hr
Issued by: the Storm Prediction Center
Largest hail expected: 1 in
Strongest gust expected: 60 kt

All 124 counties

Autauga County, AL, Barbour County, AL, Blount County, AL, Bullock County, AL, Calhoun County, AL, Chambers County, AL, Cherokee County, AL, Chilton County, AL, Clay County, AL, Cleburne County, AL, Colbert County, AL, Coosa County, AL, Cullman County, AL, DeKalb County, AL, Elmore County, AL, Etowah County, AL, Franklin County, AL, Jackson County, AL, Jefferson County, AL, Lauderdale County, AL, Lawrence County, AL, Lee County, AL, Limestone County, AL, Lowndes County, AL, Macon County, AL, Madison County, AL, Marshall County, AL, Montgomery County, AL, Morgan County, AL, Pike County, AL, Randolph County, AL, Russell County, AL, Shelby County, AL, St. Clair County, AL, Talladega County, AL, Tallapoosa County, AL, Walker County, AL, Winston County, AL, 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, Dade County, GA, DeKalb County, GA, Douglas County, GA, Fayette County, GA, Floyd County, GA, Forsyth County, GA, Fulton County, GA, Glascock County, GA, Gordon County, GA, Greene County, GA, Gwinnett County, GA, Hancock County, GA, Haralson County, GA, Harris County, GA, Heard County, GA, Henry County, GA, Houston County, GA, Jasper County, GA, Jefferson County, GA, Jones County, GA, Lamar County, GA, Macon County, GA, Meriwether County, GA, Monroe County, GA, Morgan County, GA, Newton County, GA, Paulding County, GA, Peach County, GA, Pike County, GA, Polk County, GA, Putnam County, GA, Rockdale County, GA, Spalding County, GA, Talbot County, GA, Taliaferro County, GA, Taylor County, GA, Troup County, GA, Twiggs County, GA, Upson County, GA, Walker County, GA, Walton County, GA, Warren County, GA, Washington County, GA, Wilkinson County, GA, Bedford County, TN, Benton County, TN, Carroll County, TN, Chester County, TN, Coffee County, TN, Crockett County, TN, Decatur County, TN, Dickson County, TN, Dyer County, TN, Franklin County, TN, Gibson County, TN, Giles County, TN, Hardin County, TN, Henderson County, TN, Henry County, TN, Hickman County, TN, Houston County, TN, Humphreys County, TN, Lake County, TN, Lawrence County, TN, Lewis County, TN, Lincoln County, TN, Madison County, TN, Marshall County, TN, Maury County, TN, Moore County, TN, Obion County, TN, Perry County, TN, Wayne County, TN, Weakley County, TN, Williamson County, TN

The radar

The Northeast Alabama radar (KHTX), 39 km from the middle of the area, began a volume at 15:48 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.

What SPC expected

The probabilities SPC published with the watch, for the watch area over its life.

Two or more tornadoes: 5%
One or more EF2 to EF5 tornadoes: 2%
Ten or more severe wind reports: 60%
One or more gusts of 65 knots or more: 20%
Ten or more severe hail reports: 10%
One or more hailstones of 2 inches or more: 5%
Six or more combined severe hail and wind reports: 80%

Warnings issued inside it

68 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

Issued	Product	Office	Counties	Lasted
Jun 28, 10:55 AM CDT	Severe Thunderstorm Warning	OHX	Bedford, Giles, Marshall, Maury	65 min
Jun 28, 11:00 AM CDT	Severe Thunderstorm Warning	FFC	Catoosa, Chattooga, Dade, Floyd, Gordon, Walker and 1 more	60 min
Jun 28, 11:02 AM CDT	Severe Thunderstorm Warning	HUN	Franklin, Lincoln, Moore	58 min
Jun 28, 11:06 AM CDT	Severe Thunderstorm Warning	MEG	Benton, Carroll, Henry	39 min
Jun 28, 11:31 AM CDT	Severe Thunderstorm Warning	MEG	Benton, Henry, Weakley	44 min
Jun 28, 11:33 AM CDT	Severe Thunderstorm Warning	HUN	DeKalb, Jackson	57 min
Jun 28, 11:36 AM CDT	Severe Thunderstorm Warning	MEG	Benton, Carroll, Henry	39 min
Jun 28, 11:44 AM CDT	Severe Thunderstorm Warning	OHX	Houston, Humphreys, Stewart	46 min
Jun 28, 11:47 AM CDT	Severe Thunderstorm Warning	HUN	Jackson, Madison, Marshall	58 min
Jun 28, 11:48 AM CDT	Severe Thunderstorm Warning	OHX	Giles, Marshall, Maury	42 min
Jun 28, 11:55 AM CDT	Flash Flood Warning	FFC	Catoosa, Dade, Walker	6 hr
Jun 28, 11:55 AM CDT	Severe Thunderstorm Warning	HUN	Franklin, Lincoln, Moore	50 min
Jun 28, 11:57 AM CDT	Severe Thunderstorm Warning	FFC	Chattooga, Dade, Floyd, Walker	48 min
Jun 28, 11:58 AM CDT	Severe Thunderstorm Warning	MEG	Carroll, Henderson, Henry, Weakley	28 min
Jun 28, 12:11 PM CDT	Severe Thunderstorm Warning	OHX	Dickson, Hickman, Humphreys	49 min
Jun 28, 12:14 PM CDT	Severe Thunderstorm Warning	MEG	Benton, Carroll, Decatur, Henry	30 min
Jun 28, 12:19 PM CDT	Severe Thunderstorm Warning	HUN	Limestone, Madison	56 min
Jun 28, 12:23 PM CDT	Severe Thunderstorm Warning	OHX	Giles, Marshall	52 min
Jun 28, 12:25 PM CDT	Severe Thunderstorm Warning	HUN	DeKalb, Jackson	50 min
Jun 28, 12:26 PM CDT	Severe Thunderstorm Warning	FFC	Coweta, Fayette, Meriwether, Pike, Spalding, Troup	49 min
Jun 28, 12:27 PM CDT	Severe Thunderstorm Warning	OHX	Hickman, Humphreys, Lewis, Perry	33 min
Jun 28, 12:35 PM CDT	Severe Thunderstorm Warning	HUN	DeKalb, Jackson, Madison, Marshall, Morgan	40 min
Jun 28, 12:40 PM CDT	Severe Thunderstorm Warning	HUN	Jackson, Madison	35 min
Jun 28, 12:41 PM CDT	Severe Thunderstorm Warning	FFC	Chattooga, Floyd, Polk, Walker	49 min
Jun 28, 12:43 PM CDT	Severe Thunderstorm Warning	OHX	Giles, Hickman, Lawrence, Lewis, Maury, Williamson	32 min
Jun 28, 12:55 PM CDT	Severe Thunderstorm Warning	FFC	Meriwether, Pike, Talbot, Upson	50 min
Jun 28, 12:57 PM CDT	Severe Thunderstorm Warning	BMX	Cherokee	63 min
Jun 28, 1:02 PM CDT	Severe Thunderstorm Warning	FFC	Harris, Heard, Meriwether, Troup	43 min
Jun 28, 1:05 PM CDT	Severe Thunderstorm Warning	BMX	Blount, Etowah	70 min
Jun 28, 1:05 PM CDT	Severe Thunderstorm Warning	HUN	Jackson, Limestone, Madison	55 min
Jun 28, 1:05 PM CDT	Severe Thunderstorm Warning	HUN	DeKalb, Marshall, Morgan	55 min
Jun 28, 1:09 PM CDT	Severe Thunderstorm Warning	OHX	Giles, Lawrence, Lewis, Marshall, Maury	66 min
Jun 28, 1:13 PM CDT	Severe Thunderstorm Warning	HUN	Cullman	62 min
Jun 28, 1:22 PM CDT	Severe Thunderstorm Warning	HUN	Madison	38 min
Jun 28, 1:25 PM CDT	Severe Thunderstorm Warning	FFC	Bleckley, Houston, Pulaski, Twiggs	50 min
Jun 28, 1:31 PM CDT	Severe Thunderstorm Warning	HUN	Lauderdale, Limestone, Madison	29 min
Jun 28, 1:34 PM CDT	Severe Thunderstorm Warning	FFC	Dooly, Houston, Pulaski	41 min
Jun 28, 1:39 PM CDT	Severe Thunderstorm Warning	BMX	Calhoun, St. Clair	66 min
Jun 28, 1:47 PM CDT	Severe Thunderstorm Warning	FFC	Harris, Meriwether, Muscogee, Troup	43 min
Jun 28, 1:51 PM CDT	Severe Thunderstorm Warning	HUN	Jackson, Lauderdale, Lawrence, Limestone, Madison, Morgan	34 min
Jun 28, 2:06 PM CDT	Severe Thunderstorm Warning	BMX	Talladega	39 min
Jun 28, 2:11 PM CDT	Severe Thunderstorm Warning	BMX	Blount	49 min
Jun 28, 2:12 PM CDT	Severe Thunderstorm Warning	HUN	Cullman, Lawrence, Madison, Marshall, Morgan	33 min
Jun 28, 2:12 PM CDT	Severe Thunderstorm Warning	FFC	Crisp, Dooly, Houston, Macon, Schley, Sumter	33 min
Jun 28, 2:17 PM CDT	Severe Thunderstorm Warning	BMX	Clay, Cleburne, Randolph	43 min
Jun 28, 2:23 PM CDT	Severe Thunderstorm Warning	BMX	Jefferson	52 min
Jun 28, 2:23 PM CDT	Severe Thunderstorm Warning	HUN	Franklin, Lincoln, Moore	20 min
Jun 28, 2:24 PM CDT	Severe Thunderstorm Warning	HUN	Lauderdale, Lawrence, Limestone, Madison, Morgan	51 min
Jun 28, 2:29 PM CDT	Severe Thunderstorm Warning	BMX	Clay, Randolph, Shelby, Talladega	61 min
Jun 28, 2:42 PM CDT	Severe Thunderstorm Warning	HUN	Colbert, Lauderdale, Lawrence	23 min
Jun 28, 2:44 PM CDT	Severe Thunderstorm Warning	BMX	St. Clair, Talladega	35 min
Jun 28, 2:44 PM CDT	Severe Thunderstorm Warning	HUN	Cullman, Lawrence, Morgan	31 min
Jun 28, 2:49 PM CDT	Severe Thunderstorm Warning	BMX	Chambers, Coosa, Tallapoosa	71 min
Jun 28, 2:53 PM CDT	Severe Thunderstorm Warning	BMX	Jefferson, Shelby	82 min
Jun 28, 3:03 PM CDT	Severe Thunderstorm Warning	HUN	Colbert, Franklin, Lawrence, Limestone, Morgan	42 min
Jun 28, 3:06 PM CDT	Severe Thunderstorm Warning	BMX	Barbour, Bullock, Lee, Macon, Russell	24 min
Jun 28, 3:16 PM CDT	Severe Thunderstorm Warning	BMX	Walker	59 min
Jun 28, 3:25 PM CDT	Severe Thunderstorm Warning	BMX	Barbour, Chambers, Lee, Russell	35 min
Jun 28, 3:33 PM CDT	Severe Thunderstorm Warning	BMX	Elmore, Lee, Macon, Tallapoosa	57 min
Jun 28, 3:36 PM CDT	Severe Thunderstorm Warning	BMX	Bibb, Chilton, Tuscaloosa	54 min
Jun 28, 3:58 PM CDT	Severe Thunderstorm Warning	BMX	Chambers, Lee	32 min
Jun 28, 4:02 PM CDT	Severe Thunderstorm Warning	BMX	Autauga, Dallas, Perry	58 min
Jun 28, 4:05 PM CDT	Severe Thunderstorm Warning	BMX	Bullock, Lee, Macon, Montgomery, Russell	25 min
Jun 28, 4:25 PM CDT	Severe Thunderstorm Warning	BMX	Barbour, Bullock, Elmore, Lee, Macon, Montgomery and 2 more	35 min
Jun 28, 4:27 PM CDT	Severe Thunderstorm Warning	BMX	Autauga, Bibb, Chilton, Dallas, Hale, Lowndes and 3 more	33 min
Jun 28, 4:50 PM CDT	Severe Thunderstorm Warning	BMX	Barbour, Bullock, Montgomery, Pike, Russell	25 min
Jun 28, 4:56 PM CDT	Severe Thunderstorm Warning	BMX	Autauga, Dallas, Hale, Lowndes, Montgomery, Perry	34 min
Jun 28, 5:13 PM CDT	Severe Thunderstorm Warning	BMX	Barbour, Bullock, Pike	32 min

Discussions around it

SPC mesoscale discussions over the same counties from four hours before the watch to its end.

The nearest sounding before it

Nashville Metro, TN (KBNA), launched 12:00Z, 3.8 hours before the alert went out and 132 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: 2274 J/kg
Mixed-layer CIN: -92 J/kg
Mixed-layer LCL: 1063 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 195 m²/s²
0-3 km storm-relative helicity: 251 m²/s²
Significant tornado parameter: 1.4
Supercell composite: 11.7

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 28, 10:22 AM CDT	Mesoscale Discussion	SPC	Calhoun, Cherokee, Cleburne, DeKalb, Etowah, Jackson and 6 more	113 min
Jun 28, 1:07 PM CDT	Mesoscale Discussion	SPC	Autauga, Barbour, Bibb, Blount, Bullock, Butler and 44 more	113 min
Jun 28, 4:34 PM CDT	Mesoscale Discussion	SPC	Autauga, Baldwin, Butler, Choctaw, Clarke, Coffee and 21 more	86 min
Jun 28, 4:59 PM CDT	Severe Thunderstorm Watch	SPC	Baldwin, Butler, Choctaw, Clarke, Coffee, Conecuh and 18 more	7 hr
Jun 28, 6:22 PM CDT	Mesoscale Discussion	SPC	Brooks, Camden, Charlton, Clinch, Decatur, Echols and 5 more	83 min
Jun 28, 2:00 AM CDT	Mesoscale Discussion	SPC	Adair, Audrain, Bollinger, Boone, Callaway, Cape Girardeau and 38 more	3 hr
Jun 28, 7:20 AM CDT	Mesoscale Discussion	SPC	Atchison, Holt, Nodaway	2 hr
Jun 28, 8:43 AM CDT	Mesoscale Discussion	SPC	Audrain, Bollinger, Boone, Callaway, Cape Girardeau, Cole and 25 more	62 min
Jun 28, 10:57 AM CDT	Mesoscale Discussion	SPC	Adair, Clark, Grundy, Harrison, Knox, Lewis and 13 more	2 hr
Jun 28, 1:04 PM CDT	Severe Thunderstorm Watch	SPC	Adair, Clark, Franklin, Jefferson, Knox, Lewis and 13 more	7 hr
Jun 28, 3:34 PM CDT	Mesoscale Discussion	SPC	Lincoln, Marion, Montgomery, Pike, Ralls, Saint Charles and 3 more	116 min
Jun 28, 5:33 PM CDT	Severe Thunderstorm Watch	SPC	Bollinger, Butler, Cape Girardeau, Dunklin, Iron, Madison and 10 more	7 hr

Nearby

Severe Thunderstorm Watches in Georgia, 2018 Severe Thunderstorm Watches in Alabama, 2018 Severe Thunderstorm Watches in Tennessee, 2018 Every severe thunderstorm watch 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.