Alert archive / Tennessee / Severe Thunderstorm Watches in 2017
Severe Thunderstorm Watch 274
The Storm Prediction Center issued this severe thunderstorm watch at May 27, 2017, 4:19 AM CDT for 5 states. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- May 27, 2017, 4:19 AM CDT (09:19 UTC)
- Expired
- May 27, 2017, 10:13 AM CDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1.5 in
- Strongest gust expected
- 60 kt
All 42 counties
Clay County, AR, Craighead County, AR, Crittenden County, AR, Cross County, AR, Greene County, AR, Lawrence County, AR, Mississippi County, AR, Poinsett County, AR, Randolph County, AR, Fulton County, KY, Butler County, MO, Dunklin County, MO, New Madrid County, MO, Pemiscot County, MO, Ripley County, MO, Stoddard County, MO, Alcorn County, MS, Benton County, MS, Marshall County, MS, Tippah County, MS, Tishomingo County, MS, Benton County, TN, Carroll County, TN, Chester County, TN, Crockett County, TN, Decatur County, TN, Dyer County, TN, Fayette County, TN, Gibson County, TN, Hardeman County, TN, Hardin County, TN, Haywood County, TN, Henderson County, TN, Henry County, TN, Lake County, TN, Lauderdale County, TN, Madison County, TN, McNairy County, TN, Obion County, TN, Shelby County, TN, Tipton County, TN, Weakley County, TN
The radar
The Memphis radar (KNQA), 91 km from the middle of the area, began a volume at 09:19 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
- 40%
- One or more gusts of 65 knots or more
- 10%
- Ten or more severe hail reports
- 30%
- One or more hailstones of 2 inches or more
- 10%
- Six or more combined severe hail and wind reports
- 60%
Warnings issued inside it
8 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 27, 4:34 AM CDT | Severe Thunderstorm Warning | PAH | Ripley | 41 min |
| May 27, 4:47 AM CDT | Severe Thunderstorm Warning | MEG | Clay, Greene, Lawrence, Randolph | 43 min |
| May 27, 5:11 AM CDT | Severe Thunderstorm Warning | PAH | Butler, Ripley | 38 min |
| May 27, 5:25 AM CDT | Severe Thunderstorm Warning | MEG | Clay, Greene, Randolph | 50 min |
| May 27, 5:29 AM CDT | Severe Thunderstorm Warning | MEG | Craighead, Greene, Lawrence, Randolph | 46 min |
| May 27, 5:54 AM CDT | Severe Thunderstorm Warning | MEG | Clay | 51 min |
| May 27, 6:10 AM CDT | Severe Thunderstorm Warning | MEG | Craighead, Greene, Mississippi | 50 min |
| May 27, 6:45 AM CDT | Severe Thunderstorm Warning | MEG | Mississippi | 21 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
Little Rock, AR (KBYH), launched 00:00Z, 9.3 hours before the alert went out and 148 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
- 1997 J/kg
- Mixed-layer CIN
- -268 J/kg
- Mixed-layer LCL
- 951 m above ground
- 0-6 km bulk shear
- 31 kt
- 0-1 km storm-relative helicity
- 161 m²/s²
- 0-3 km storm-relative helicity
- 178 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.5
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 26, 10:36 PM CDT | Mesoscale Discussion | SPC | Benton, Crawford, Madison, Washington | 54 min |
| May 27, 12:06 AM CDT | Severe Thunderstorm Watch | SPC | Baxter, Benton, Boone, Carroll, Fulton, Izard and 7 more | 5 hr |
| May 27, 2:04 AM CDT | Mesoscale Discussion | SPC | Baxter, Benton, Boone, Carroll, Fulton, Independence and 10 more | 116 min |
| May 27, 3:54 AM CDT | Mesoscale Discussion | SPC | Baxter, Boone, Clay, Craighead, Fulton, Greene and 7 more | 2 hr |
| May 27, 6:12 AM CDT | Mesoscale Discussion | SPC | Clay, Craighead, Crittenden, Cross, Greene, Mississippi and 1 more | 2 hr |
| May 27, 4:01 PM CDT | Tornado Watch | SPC | Benton, Carroll, Crawford, Franklin, Madison, Sebastian and 1 more | 10 hr |
| May 27, 6:17 PM CDT | Mesoscale Discussion | SPC | Baxter, Boone, Cleburne, Craighead, Fulton, Greene and 12 more | 58 min |
| May 27, 9:13 AM CDT | Mesoscale Discussion | SPC | Adair, Allen, Barren, Bell, Clinton, Cumberland and 12 more | 92 min |
| May 27, 12:50 PM CDT | Mesoscale Discussion | SPC | Adair, Allen, Anderson, Barren, Bath, Bell and 88 more | 85 min |
| May 27, 1:16 PM CDT | Mesoscale Discussion | SPC | Ballard, Caldwell, Calloway, Carlisle, Christian, Crittenden and 16 more | 59 min |
| May 27, 1:36 PM CDT | Severe Thunderstorm Watch | SPC | Adair, Allen, Anderson, Ballard, Barren, Bourbon and 65 more | 7 hr |
| May 27, 3:11 PM CDT | Severe Thunderstorm Watch | SPC | Bath, Bell, Boone, Boyd, Bracken, Breathitt and 43 more | 6 hr |
| May 27, 3:50 PM CDT | Mesoscale Discussion | SPC | Adair, Allen, Anderson, Ballard, Barren, Boyle and 53 more | 85 min |
| May 27, 5:13 PM CDT | Severe Thunderstorm Watch | SPC | Allen, Ballard, Butler, Caldwell, Calloway, Carlisle and 22 more | 7 hr |
| May 27, 9:59 AM CDT | Mesoscale Discussion | SPC | Barton, Bates, Benton, Boone, Callaway, Camden and 47 more | 2 hr |
| May 27, 12:13 PM CDT | Tornado Watch | SPC | Barry, Barton, Bates, Benton, Bollinger, Boone and 61 more | 7 hr |
| May 27, 1:12 PM CDT | Mesoscale Discussion | SPC | Barry, Barton, Bates, Benton, Bollinger, Camden and 50 more | 93 min |
| May 27, 3:29 PM CDT | Mesoscale Discussion | SPC | Bollinger, Butler, Carter, Crawford, Dent, Howell and 14 more | 91 min |
| May 27, 4:24 PM CDT | Mesoscale Discussion | SPC | Bollinger, Butler, Cape Girardeau, Carter, Dent, Iron and 8 more | 66 min |
| May 27, 5:56 PM CDT | Mesoscale Discussion | SPC | Benton, Boone, Callaway, Camden, Cole, Cooper and 18 more | 64 min |
| May 27, 6:26 PM CDT | Severe Thunderstorm Watch | SPC | Barton, Benton, Boone, Callaway, Camden, Cedar and 28 more | 3 hr |
| May 27, 7:49 AM CDT | Mesoscale Discussion | SPC | Benton, Carroll, Chester, Crockett, Decatur, Dyer and 12 more | 86 min |
| May 27, 5:11 PM CDT | Mesoscale Discussion | SPC | Anderson, Blount, Campbell, Carter, Claiborne, Cocke and 16 more | 64 min |
| May 27, 5:55 PM CDT | Severe Thunderstorm Watch | SPC | Anderson, Bledsoe, Blount, Bradley, Campbell, Carter and 27 more | 9 hr |
Nearby
Severe Thunderstorm Watches in Tennessee, 2017Severe Thunderstorm Watches in Arkansas, 2017Severe Thunderstorm Watches in Missouri, 2017Every severe thunderstorm watch 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.