Alert archive / North Carolina / Severe Thunderstorm Watches in 2017
Severe Thunderstorm Watch 282
The Storm Prediction Center issued this severe thunderstorm watch at May 27, 2017, 6:55 PM EDT for 38 counties in North Carolina; 33 counties in Tennessee; 17 counties in Virginia. It was in force for 9 hr.
The area
The outline as issued.
The facts
- Issued
- May 27, 2017, 6:55 PM EDT (22:55 UTC)
- Expired
- May 28, 2017, 3:32 AM EDT
- In force
- 9 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
All 88 counties
Alexander County, NC, Alleghany County, NC, Ashe County, NC, Avery County, NC, Buncombe County, NC, Burke County, NC, Cabarrus County, NC, Caldwell County, NC, Catawba County, NC, Cherokee County, NC, Clay County, NC, Cleveland County, NC, Davidson County, NC, Davie County, NC, Forsyth County, NC, Gaston County, NC, Graham County, NC, Haywood County, NC, Henderson County, NC, Iredell County, NC, Jackson County, NC, Lincoln County, NC, Macon County, NC, Madison County, NC, McDowell County, NC, Mecklenburg County, NC, Mitchell County, NC, Polk County, NC, Rowan County, NC, Rutherford County, NC, Stokes County, NC, Surry County, NC, Swain County, NC, Transylvania County, NC, Watauga County, NC, Wilkes County, NC, Yadkin County, NC, Yancey County, NC, Anderson County, TN, Bledsoe County, TN, Blount County, TN, Bradley County, TN, Campbell County, TN, Carter County, TN, Claiborne County, TN, Cocke County, TN, Grainger County, TN, Greene County, TN, Hamblen County, TN, Hamilton County, TN, Hancock County, TN, Hawkins County, TN, Jefferson County, TN, Johnson County, TN, Knox County, TN, Loudon County, TN, Marion County, TN, McMinn County, TN, Meigs County, TN, Monroe County, TN, Morgan County, TN, Polk County, TN, Rhea County, TN, Roane County, TN, Scott County, TN, Sequatchie County, TN, Sevier County, TN, Sullivan County, TN, Unicoi County, TN, Union County, TN, Washington County, TN, Bland County, VA, Carroll County, VA, City of Bristol, VA, City of Galax, VA, City of Norton, VA, Floyd County, VA, Grayson County, VA, Lee County, VA, Patrick County, VA, Pulaski County, VA, Russell County, VA, Scott County, VA, Smyth County, VA, Tazewell County, VA, Washington County, VA, Wise County, VA, Wythe County, VA
The radar
The Knoxville radar (KMRX), 16 km from the middle of the area, began a volume at 22:58 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
- 10%
- One or more EF2 to EF5 tornadoes
- 2%
- Ten or more severe wind reports
- 40%
- 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
- 30%
- Six or more combined severe hail and wind reports
- 80%
Warnings issued inside it
26 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 27, 7:16 PM EDT | Severe Thunderstorm Warning | MRX | Russell, Scott, Washington, City of Bristol | 59 min |
| May 27, 7:32 PM EDT | Severe Thunderstorm Warning | RNK | Alleghany, Ashe | 58 min |
| May 27, 8:04 PM EDT | Severe Thunderstorm Warning | MRX | Lee | 26 min |
| May 27, 8:08 PM EDT | Flash Flood Warning | RNK | Grayson, Smyth | 4 hr |
| May 27, 8:37 PM EDT | Flash Flood Warning | MRX | Lee, Russell, Scott, Wise | 3 hr |
| May 27, 9:25 PM EDT | Severe Thunderstorm Warning | MRX | Bledsoe, Morgan, Rhea, Roane, Scott, Sequatchie | 65 min |
| May 27, 10:00 PM EDT | Severe Thunderstorm Warning | MRX | Anderson, Campbell, Claiborne, Knox, Union | 60 min |
| May 27, 10:08 PM EDT | Severe Thunderstorm Warning | MRX | Blount, Bradley, Hamilton, Loudon, McMinn, Marion and 2 more | 67 min |
| May 27, 10:17 PM EDT | Severe Thunderstorm Warning | GSP | Davie, Iredell | 73 min |
| May 27, 10:31 PM EDT | Severe Thunderstorm Warning | MRX | Cocke, Grainger, Hamblen, Jefferson, Sevier | 59 min |
| May 27, 10:50 PM EDT | Severe Thunderstorm Warning | MRX | Cherokee, Clay | 55 min |
| May 27, 10:55 PM EDT | Severe Thunderstorm Warning | GSP | Graham, Haywood, Jackson, Macon, Swain | 50 min |
| May 27, 11:09 PM EDT | Severe Thunderstorm Warning | MRX | Greene, Hawkins | 66 min |
| May 27, 11:29 PM EDT | Severe Thunderstorm Warning | MRX | Cocke, Hamblen | 31 min |
| May 27, 11:37 PM EDT | Severe Thunderstorm Warning | GSP | Buncombe, Haywood, Henderson, Jackson, Madison, Transylvania and 1 more | 53 min |
| May 27, 11:43 PM EDT | Severe Thunderstorm Warning | GSP | Jackson, Macon, Transylvania | 47 min |
| May 27, 11:54 PM EDT | Severe Thunderstorm Warning | MRX | Carter, Unicoi, Washington | 31 min |
| May 27, 11:59 PM EDT | Severe Thunderstorm Warning | GSP | Avery, Burke, Caldwell, Mitchell | 31 min |
| May 28, 12:18 AM EDT | Severe Thunderstorm Warning | GSP | Buncombe, Henderson, McDowell, Polk, Rutherford | 57 min |
| May 28, 12:21 AM EDT | Severe Thunderstorm Warning | GSP | Avery, Burke, McDowell, Mitchell, Yancey | 54 min |
| May 28, 12:54 AM EDT | Flash Flood Warning | GSP | Mitchell, Yancey | 3 hr |
| May 28, 12:55 AM EDT | Severe Thunderstorm Warning | GSP | Burke, Caldwell, Rutherford | 59 min |
| May 28, 1:05 AM EDT | Severe Thunderstorm Warning | GSP | Cleveland, Rutherford | 40 min |
| May 28, 1:35 AM EDT | Severe Thunderstorm Warning | GSP | Catawba, Cleveland, Gaston, Lincoln | 55 min |
| May 28, 2:05 AM EDT | Severe Thunderstorm Warning | GSP | Cabarrus, Davie, Iredell, Mecklenburg, Rowan | 70 min |
| May 28, 2:38 AM EDT | Severe Thunderstorm Warning | RAH | Davidson, Montgomery, Randolph, Stanly | 40 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
Greensboro/Hi Pt, NC (KGSO), launched 12:00Z, 10.9 hours before the alert went out and 299 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
- 24 J/kg
- Mixed-layer CIN
- -544 J/kg
- Mixed-layer LCL
- 1610 m above ground
- 0-6 km bulk shear
- 37 kt
- 0-1 km storm-relative helicity
- 38 m²/s²
- 0-3 km storm-relative helicity
- 140 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 27, 4:54 AM EDT | Mesoscale Discussion | SPC | Fulton | 2 hr |
| May 27, 5:19 AM EDT | Severe Thunderstorm Watch | SPC | Fulton | 6 hr |
| May 27, 7:12 AM EDT | Mesoscale Discussion | SPC | Fulton | 2 hr |
| May 27, 10:13 AM EDT | Mesoscale Discussion | SPC | Adair, Allen, Barren, Bell, Clinton, Cumberland and 12 more | 92 min |
| May 27, 1:50 PM EDT | Mesoscale Discussion | SPC | Adair, Allen, Anderson, Barren, Bath, Bell and 88 more | 85 min |
| May 27, 2:16 PM EDT | Mesoscale Discussion | SPC | Ballard, Caldwell, Calloway, Carlisle, Christian, Crittenden and 16 more | 59 min |
| May 27, 2:36 PM EDT | Severe Thunderstorm Watch | SPC | Adair, Allen, Anderson, Ballard, Barren, Bourbon and 65 more | 7 hr |
| May 27, 4:11 PM EDT | Severe Thunderstorm Watch | SPC | Bath, Bell, Boone, Boyd, Bracken, Breathitt and 43 more | 6 hr |
| May 27, 4:50 PM EDT | Mesoscale Discussion | SPC | Adair, Allen, Anderson, Ballard, Barren, Boyle and 53 more | 85 min |
| May 27, 6:13 PM EDT | Severe Thunderstorm Watch | SPC | Allen, Ballard, Butler, Caldwell, Calloway, Carlisle and 22 more | 7 hr |
| May 27, 4:16 PM EDT | Mesoscale Discussion | SPC | Caswell, Granville, Halifax, Northampton, Person, Rockingham and 2 more | 89 min |
| May 27, 4:43 PM EDT | Severe Thunderstorm Watch | SPC | Bertie, Camden, Chowan, Currituck, Edgecombe, Franklin and 11 more | 5 hr |
| May 27, 6:11 PM EDT | Mesoscale Discussion | SPC | Alexander, Alleghany, Ashe, Avery, Burke, Caldwell and 14 more | 64 min |
| May 27, 6:57 PM EDT | Mesoscale Discussion | SPC | Bertie, Camden, Chowan, Currituck, Edgecombe, Franklin and 13 more | 93 min |
| May 27, 8:49 AM EDT | Mesoscale Discussion | SPC | Benton, Carroll, Chester, Crockett, Decatur, Dyer and 12 more | 86 min |
Nearby
Severe Thunderstorm Watches in North Carolina, 2017Severe Thunderstorm Watches in Tennessee, 2017Severe Thunderstorm Watches in Virginia, 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.