Alert archive / Tennessee / Severe Thunderstorm Watches in 2018
Severe Thunderstorm Watch 32
The Storm Prediction Center issued this severe thunderstorm watch at Apr 3, 2018, 7:14 PM CDT for 16 counties in Alabama; 20 counties in Mississippi; 51 counties in Tennessee. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 3, 2018, 7:14 PM CDT (00:14 UTC)
- Expired
- Apr 4, 2018, 12:15 AM CDT
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1 in
- Strongest gust expected
- 60 kt
All 87 counties
Colbert County, AL, Cullman County, AL, DeKalb County, AL, Fayette County, AL, Franklin County, AL, Jackson County, AL, Lamar County, AL, Lauderdale County, AL, Lawrence County, AL, Limestone County, AL, Madison County, AL, Marion County, AL, Marshall County, AL, Morgan County, AL, Walker County, AL, Winston County, AL, Alcorn County, MS, Benton County, MS, Calhoun County, MS, Chickasaw County, MS, Coahoma County, MS, Itawamba County, MS, Lafayette County, MS, Lee County, MS, Marshall County, MS, Monroe County, MS, Panola County, MS, Pontotoc County, MS, Prentiss County, MS, Quitman County, MS, Tallahatchie County, MS, Tate County, MS, Tippah County, MS, Tishomingo County, MS, Union County, MS, Yalobusha County, MS, Bedford County, TN, Benton County, TN, Cannon County, TN, Carroll County, TN, Cheatham County, TN, Chester County, TN, Clay County, TN, Coffee County, TN, Cumberland County, TN, Davidson County, TN, Decatur County, TN, DeKalb County, TN, Dickson County, TN, Fayette County, TN, Fentress County, TN, Franklin County, TN, Giles County, TN, Grundy County, TN, Hardeman County, TN, Hardin County, TN, Henderson County, TN, Hickman County, TN, Houston County, TN, Humphreys County, TN, Jackson County, TN, Lawrence County, TN, Lewis County, TN, Lincoln County, TN, Macon County, TN, Madison County, TN, Marshall County, TN, Maury County, TN, McNairy County, TN, Montgomery County, TN, Moore County, TN, Overton County, TN, Perry County, TN, Pickett County, TN, Putnam County, TN, Robertson County, TN, Rutherford County, TN, Smith County, TN, Stewart County, TN, Sumner County, TN, Trousdale County, TN, Van Buren County, TN, Warren County, TN, Wayne County, TN, White County, TN, Williamson County, TN, Wilson County, TN
The radar
The Nashville radar (KOHX), 91 km from the middle of the area, began a volume at 00:16 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
- 20%
- One or more EF2 to EF5 tornadoes
- 5%
- Ten or more severe wind reports
- 70%
- One or more gusts of 65 knots or more
- 10%
- Ten or more severe hail reports
- 40%
- One or more hailstones of 2 inches or more
- 20%
- Six or more combined severe hail and wind reports
- 90%
Warnings issued inside it
30 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 3, 7:30 PM CDT | Severe Thunderstorm Warning | MEG | Crockett, Dyer, Gibson, Haywood, Lauderdale, Madison | 10 min |
| Apr 3, 8:16 PM CDT | Severe Thunderstorm Warning | MEG | Itawamba, Lafayette, Lee, Pontotoc, Union | 44 min |
| Apr 3, 8:26 PM CDT | Severe Thunderstorm Warning | MEG | Itawamba, Lee, Monroe, Pontotoc, Prentiss, Tippah and 2 more | 49 min |
| Apr 3, 8:34 PM CDT | Severe Thunderstorm Warning | OHX | Dickson, Houston, Humphreys, Montgomery, Stewart | 26 min |
| Apr 3, 8:37 PM CDT | Severe Thunderstorm Warning | MEG | Benton, Carroll, Decatur, Henderson | 23 min |
| Apr 3, 8:38 PM CDT | Severe Thunderstorm Warning | OHX | Hickman, Maury | 37 min |
| Apr 3, 8:41 PM CDT | Severe Thunderstorm Warning | OHX | Davidson, Rutherford, Williamson, Wilson | 34 min |
| Apr 3, 8:43 PM CDT | Severe Thunderstorm Warning | OHX | Davidson, Williamson | 32 min |
| Apr 3, 8:50 PM CDT | Severe Thunderstorm Warning | MEG | Calhoun, Chickasaw, Itawamba, Lee, Monroe, Pontotoc | 40 min |
| Apr 3, 8:54 PM CDT | Severe Thunderstorm Warning | HUN | Colbert, Franklin, Lauderdale | 36 min |
| Apr 3, 8:54 PM CDT | Severe Thunderstorm Warning | OHX | Cheatham, Davidson, Dickson, Montgomery, Robertson | 36 min |
| Apr 3, 9:10 PM CDT | Severe Thunderstorm Warning | BMX | Lamar, Marion | 80 min |
| Apr 3, 9:13 PM CDT | Severe Thunderstorm Warning | OHX | Davidson, Rutherford, Wilson | 32 min |
| Apr 3, 9:24 PM CDT | Severe Thunderstorm Warning | HUN | Colbert, Franklin, Lauderdale, Lawrence | 51 min |
| Apr 3, 9:25 PM CDT | Severe Thunderstorm Warning | OHX | Smith, Trousdale, Wilson | 15 min |
| Apr 3, 9:26 PM CDT | Severe Thunderstorm Warning | OHX | Macon, Robertson, Sumner | 34 min |
| Apr 3, 9:29 PM CDT | Severe Thunderstorm Warning | MEG | Monroe | 31 min |
| Apr 3, 9:40 PM CDT | Tornado Warning | HUN | Colbert, Lauderdale, Lawrence | 20 min |
| Apr 3, 9:44 PM CDT | Severe Thunderstorm Warning | BMX | Fayette | 61 min |
| Apr 3, 9:51 PM CDT | Severe Thunderstorm Warning | BMX | Walker, Winston | 54 min |
| Apr 3, 10:05 PM CDT | Severe Thunderstorm Warning | HUN | Lauderdale, Lawrence, Limestone, Morgan | 40 min |
| Apr 3, 10:23 PM CDT | Severe Thunderstorm Warning | HUN | Cullman | 52 min |
| Apr 3, 10:23 PM CDT | Severe Thunderstorm Warning | OHX | Cumberland, Fentress, Overton, Putnam | 52 min |
| Apr 3, 10:26 PM CDT | Severe Thunderstorm Warning | HUN | Limestone, Madison, Marshall, Morgan | 49 min |
| Apr 3, 10:28 PM CDT | Severe Thunderstorm Warning | OHX | DeKalb, Van Buren, Warren, White | 32 min |
| Apr 3, 10:41 PM CDT | Severe Thunderstorm Warning | HUN | Lincoln, Moore | 49 min |
| Apr 3, 10:58 PM CDT | Severe Thunderstorm Warning | OHX | Cumberland, Van Buren, White | 47 min |
| Apr 3, 11:01 PM CDT | Severe Thunderstorm Warning | HUN | DeKalb, Jackson, Madison, Marshall | 44 min |
| Apr 3, 11:29 PM CDT | Severe Thunderstorm Warning | HUN | DeKalb, Jackson | 46 min |
| Apr 3, 11:44 PM CDT | Severe Thunderstorm Warning | HUN | Franklin | 9 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 00:00Z, 0.2 hours before the alert went out and 78 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.
- Mixed-layer CAPE
- 398 J/kg
- Mixed-layer CIN
- -16 J/kg
- Mixed-layer LCL
- 1862 m above ground
- 0-6 km bulk shear
- 54 kt
- 0-1 km storm-relative helicity
- 243 m²/s²
- 0-3 km storm-relative helicity
- 349 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 4.8
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 3, 9:47 PM CDT | Severe Thunderstorm Watch | SPC | Bibb, Blount, Calhoun, Cherokee, Chilton, Clay and 13 more | 4 hr |
| Apr 3, 11:09 PM CDT | Mesoscale Discussion | SPC | Autauga, Bibb, Calhoun, Cherokee, Chilton, Choctaw and 21 more | 66 min |
| Apr 4, 1:00 AM CDT | Mesoscale Discussion | SPC | Autauga, Chambers, Chilton, Clay, Cleburne, Coosa and 4 more | 105 min |
| Apr 3, 7:43 PM CDT | Mesoscale Discussion | SPC | Adams, Attala, Bolivar, Carroll, Choctaw, Claiborne and 35 more | 92 min |
| Apr 3, 8:13 PM CDT | Severe Thunderstorm Watch | SPC | Attala, Choctaw, Clarke, Clay, Covington, Jasper and 16 more | 3 hr |
| Apr 3, 11:33 PM CDT | Mesoscale Discussion | SPC | Amite, Clarke, Forrest, Jones, Lamar, Marion and 5 more | 57 min |
| Apr 3, 8:16 PM CDT | Mesoscale Discussion | SPC | Anderson, Bedford, Bledsoe, Blount, Campbell, Cannon and 31 more | 89 min |
| Apr 3, 8:50 PM CDT | Severe Thunderstorm Watch | SPC | Anderson, Bledsoe, Blount, Bradley, Campbell, Claiborne and 20 more | 5 hr |
| Apr 3, 10:49 PM CDT | Mesoscale Discussion | SPC | Anderson, Bledsoe, Blount, Bradley, Campbell, Claiborne and 21 more | 86 min |
Nearby
Severe Thunderstorm Watches in Tennessee, 2018Severe Thunderstorm Watches in Mississippi, 2018Severe Thunderstorm Watches in Alabama, 2018Every 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.