Alert archive / North Carolina / Tornado Watches in 2021
Tornado Watch 444
The Storm Prediction Center issued this tornado watch at Aug 17, 2021, 10:42 AM EDT for 4 counties in Georgia; 26 counties in North Carolina; 24 counties in South Carolina. It was in force for 8 hr.
The area
The outline as issued.
The facts
- Issued
- Aug 17, 2021, 10:42 AM EDT (14:42 UTC)
- Expired
- Aug 17, 2021, 6:37 PM EDT
- In force
- 8 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 0.5 in
- Strongest gust expected
- 60 kt
All 54 counties
Columbia County, GA, Lincoln County, GA, McDuffie County, GA, Rabun County, GA, Alexander County, NC, Avery County, NC, Buncombe County, NC, Burke County, NC, Cabarrus County, NC, Caldwell County, NC, Catawba County, NC, Cleveland County, NC, Davie County, NC, Gaston 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, Transylvania County, NC, Union County, NC, Yancey County, NC, Abbeville County, SC, Aiken County, SC, Anderson County, SC, Bamberg County, SC, Barnwell County, SC, Calhoun County, SC, Cherokee County, SC, Chester County, SC, Edgefield County, SC, Fairfield County, SC, Greenville County, SC, Greenwood County, SC, Laurens County, SC, Lexington County, SC, McCormick County, SC, Newberry County, SC, Oconee County, SC, Orangeburg County, SC, Pickens County, SC, Richland County, SC, Saluda County, SC, Spartanburg County, SC, Union County, SC, York County, SC
The radar
The Greer radar (KGSP), 28 km from the middle of the area, began a volume at 14:47 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
- 60%
- One or more EF2 to EF5 tornadoes
- 20%
- Ten or more severe wind reports
- 40%
- One or more gusts of 65 knots or more
- 20%
- Ten or more severe hail reports
- 5%
- One or more hailstones of 2 inches or more
- 5%
- Six or more combined severe hail and wind reports
- 50%
Warnings issued inside it
58 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 17, 11:36 AM EDT | Tornado Warning | GSP | Alexander, Iredell | 39 min |
| Aug 17, 11:47 AM EDT | Tornado Warning | GSP | Habersham, Rabun, Stephens | 13 min |
| Aug 17, 11:52 AM EDT | Flash Flood Warning | GSP | Habersham, Rabun | 5 hr |
| Aug 17, 12:06 PM EDT | Tornado Warning | GSP | Iredell | 39 min |
| Aug 17, 12:30 PM EDT | Flash Flood Warning | GSP | Oconee | 5 hr |
| Aug 17, 12:30 PM EDT | Tornado Warning | GSP | Oconee, Pickens | 23 min |
| Aug 17, 12:33 PM EDT | Tornado Warning | GSP | Alexander | 12 min |
| Aug 17, 12:42 PM EDT | Tornado Warning | GSP | Iredell | 18 min |
| Aug 17, 12:59 PM EDT | Tornado Warning | CAE | Edgefield | 46 min |
| Aug 17, 12:59 PM EDT | Tornado Warning | GSP | Anderson, Pickens | 23 min |
| Aug 17, 1:09 PM EDT | Flash Flood Warning | GSP | Jackson, Macon, Transylvania | 5 hr |
| Aug 17, 1:20 PM EDT | Tornado Warning | GSP | Pickens | 25 min |
| Aug 17, 1:25 PM EDT | Flash Flood Warning | GSP | Transylvania | 4 hr |
| Aug 17, 1:44 PM EDT | Tornado Warning | CAE | Edgefield, McCormick, Saluda | 17 min |
| Aug 17, 1:55 PM EDT | Tornado Warning | CAE | Aiken, Edgefield, Lexington, Saluda | 50 min |
| Aug 17, 2:03 PM EDT | Flash Flood Warning | GSP | Greenville, Pickens | 5 hr |
| Aug 17, 2:08 PM EDT | Tornado Warning | CAE | Aiken | 37 min |
| Aug 17, 2:14 PM EDT | Tornado Warning | GSP | Greenwood, Laurens | 33 min |
| Aug 17, 2:31 PM EDT | Tornado Warning | GSP | Rabun | 19 min |
| Aug 17, 2:31 PM EDT | Tornado Warning | GSP | Burke, Caldwell | 44 min |
| Aug 17, 2:31 PM EDT | Tornado Warning | CAE | Barnwell | 44 min |
| Aug 17, 2:52 PM EDT | Tornado Warning | GSP | Greenville | 26 min |
| Aug 17, 3:01 PM EDT | Tornado Warning | GSP | Greenville | 18 min |
| Aug 17, 3:02 PM EDT | Tornado Warning | GSP | Caldwell | 43 min |
| Aug 17, 3:06 PM EDT | Tornado Warning | GSP | Alexander, Caldwell | 39 min |
| Aug 17, 3:12 PM EDT | Flash Flood Warning | GSP | Haywood | 3 hr |
| Aug 17, 3:12 PM EDT | Tornado Warning | CAE | Lexington, Saluda | 48 min |
| Aug 17, 3:41 PM EDT | Flash Flood Warning | GSP | Buncombe | 5 hr |
| Aug 17, 3:48 PM EDT | Tornado Warning | GSP | Alexander, Burke, Caldwell, Catawba | 42 min |
| Aug 17, 3:48 PM EDT | Tornado Warning | CAE | Fairfield, Lexington, Newberry, Richland | 42 min |
| Aug 17, 4:07 PM EDT | Tornado Warning | GSP | Avery, Burke, McDowell, Mitchell | 53 min |
| Aug 17, 4:08 PM EDT | Flash Flood Warning | GSP | Madison | 9 hr |
| Aug 17, 4:16 PM EDT | Flash Flood Warning | GSP | Buncombe, Henderson | 5 hr |
| Aug 17, 4:17 PM EDT | Tornado Warning | GSP | Avery, Burke, Caldwell | 43 min |
| Aug 17, 4:20 PM EDT | Tornado Warning | GSP | Henderson, Polk, Rutherford | 12 min |
| Aug 17, 4:24 PM EDT | Flash Flood Warning | GSP | Haywood | 4 hr |
| Aug 17, 4:25 PM EDT | Severe Thunderstorm Warning | CAE | Fairfield, Newberry | 50 min |
| Aug 17, 4:35 PM EDT | Flash Flood Warning | GSP | Buncombe, Henderson, Polk, Rutherford | 8 hr |
| Aug 17, 4:48 PM EDT | Severe Thunderstorm Warning | CAE | Bamberg, Orangeburg | 42 min |
| Aug 17, 4:50 PM EDT | Flash Flood Warning | GSP | McDowell | 9 hr |
| Aug 17, 4:56 PM EDT | Tornado Warning | CAE | Orangeburg | 34 min |
| Aug 17, 4:58 PM EDT | Flash Flood Warning | GSP | Yancey | 4 hr |
| Aug 17, 4:59 PM EDT | Tornado Warning | GSP | Avery, Burke, McDowell, Mitchell, Yancey | 46 min |
| Aug 17, 5:08 PM EDT | Tornado Warning | GSP | Anderson, Greenville, Pickens | 52 min |
| Aug 17, 5:10 PM EDT | Tornado Warning | GSP | Abbeville, Greenville, Greenwood, Laurens | 50 min |
| Aug 17, 5:11 PM EDT | Tornado Warning | GSP | Abbeville, Greenwood, Laurens | 49 min |
| Aug 17, 5:14 PM EDT | Flash Flood Warning | GSP | Transylvania | 4 hr |
| Aug 17, 5:26 PM EDT | Tornado Warning | GSP | Avery, McDowell, Mitchell, Rutherford, Yancey | 49 min |
| Aug 17, 5:28 PM EDT | Tornado Warning | GSP | Avery, Burke, Caldwell | 47 min |
| Aug 17, 5:29 PM EDT | Tornado Warning | CAE | Calhoun, Orangeburg | 46 min |
| Aug 17, 5:32 PM EDT | Flash Flood Warning | GSP | Mitchell | 4 hr |
| Aug 17, 5:33 PM EDT | Tornado Warning | GSP | Anderson, Greenville, Spartanburg | 42 min |
| Aug 17, 5:37 PM EDT | Tornado Warning | GSP | Chester, York | 38 min |
| Aug 17, 5:57 PM EDT | Tornado Warning | GSP | Greenville, Laurens, Spartanburg | 48 min |
| Aug 17, 5:58 PM EDT | Tornado Warning | GSP | Greenwood, Laurens | 47 min |
| Aug 17, 6:00 PM EDT | Flash Flood Warning | GSP | Avery, Burke, Caldwell | 9 hr |
| Aug 17, 6:15 PM EDT | Tornado Warning | GSP | Laurens, Spartanburg, Union | 45 min |
| Aug 17, 6:16 PM EDT | Flash Flood Warning | GSP | Henderson, Polk, Rutherford | 3 hr |
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, 2.7 hours before the alert went out and 245 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
- 522 J/kg
- Mixed-layer CIN
- -5 J/kg
- Mixed-layer LCL
- 593 m above ground
- 0-6 km bulk shear
- 26 kt
- 0-1 km storm-relative helicity
- 77 m²/s²
- 0-3 km storm-relative helicity
- 99 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 0.9
The text
As transmitted.
644 WWUS20 KWNS 171439 SEL4 SPC WW 171439 GAZ000-NCZ000-SCZ000-172300- URGENT - IMMEDIATE BROADCAST REQUESTED Tornado Watch Number 444 NWS Storm Prediction Center Norman OK 1040 AM EDT Tue Aug 17 2021 The NWS Storm Prediction Center has issued a * Tornado Watch for portions of Northeast Georgia Western North Carolina Western South Carolina * Effective this Tuesday morning and evening from 1040 AM until 700 PM EDT. * Primary threats include... A few tornadoes likely Scattered damaging wind gusts to 70 mph possible SUMMARY...The remnants of Fred will continue to track northward across Georgia, with bands of thunderstorms affecting the watch area. Isolated tornadoes and gusty winds will be possible through the day. The tornado watch area is approximately along and 60 statute miles either side of a line from 35 miles west northwest of Asheville NC to 65 miles south southeast of Spartanburg SC. For a complete depiction of the watch see the associated watch outline update (WOUS64 KWNS WOU4). PRECAUTIONARY/PREPAREDNESS ACTIONS... REMEMBER...A Tornado Watch means conditions are favorable for tornadoes and severe thunderstorms in and close to the watch area. Persons in these areas should be on the lookout for threatening weather conditions and listen for later statements and possible warnings. && OTHER WATCH INFORMATION...CONTINUE...WW 443... AVIATION...Tornadoes and a few severe thunderstorms with hail surface and aloft to 0.5 inches. Extreme turbulence and surface wind gusts to 60 knots. A few cumulonimbi with maximum tops to 500. Mean storm motion vector 16025. ...Hart
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 17, 3:13 AM EDT | Mesoscale Discussion | SPC | Bibb, Butts, Crawford, Henry, Houston, Jasper and 8 more | 2 hr |
| Aug 17, 3:45 AM EDT | Tornado Watch | SPC | Baldwin, Banks, Barrow, Bibb, Bleckley, Butts and 49 more | 9 hr |
| Aug 17, 8:22 AM EDT | Mesoscale Discussion | SPC | Banks, Clarke, Columbia, Elbert, Franklin, Glascock and 12 more | 113 min |
| Aug 17, 12:35 PM EDT | Mesoscale Discussion | SPC | Alexander, Cabarrus, Catawba, Cleveland, Davie, Forsyth and 9 more | 85 min |
| Aug 17, 1:06 PM EDT | Tornado Watch | SPC | Alleghany, Ashe, Rockingham, Stokes, Surry, Watauga and 2 more | 5 hr |
| Aug 17, 3:25 PM EDT | Mesoscale Discussion | SPC | Buncombe, Burke, Cleveland, Gaston, Henderson, Lincoln and 4 more | 2 hr |
| Aug 17, 5:55 PM EDT | Mesoscale Discussion | SPC | Alexander, Alleghany, Ashe, Avery, Buncombe, Burke and 28 more | 65 min |
| Aug 17, 6:28 PM EDT | Tornado Watch | SPC | Alexander, Alleghany, Ashe, Avery, Buncombe, Burke and 24 more | 10 hr |
Nearby
Tornado Watches in North Carolina, 2021Tornado Watches in South Carolina, 2021Tornado Watches in Georgia, 2021Every tornado watch in 2021
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.