Two lines of showers and thunderstorms developed ahead of a cold front and associated area of low pressure and moved over the western Piedmont of North Carolina on the 1st: one during early/mid afternoon, and another during the evening. Several embedded thunderstorms produced brief damaging winds, while flash flooding developed across a portion of the Charlotte metro area.
Every event with a place to put it. Tap one for its entry below.
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS GSP wrote it up.
Two lines of showers and thunderstorms developed ahead of a cold front and associated area of low pressure and moved over the western Piedmont of North Carolina on the 1st: one during early/mid afternoon, and another during the evening. Several embedded thunderstorms produced brief damaging winds, while flash flooding developed across a portion of the Charlotte metro area.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Greenville-Spartanburg, SC wrote its last area forecast discussion before the first event at Sep 1, 1:04 PM EST, 26 minutes earlier.
Area Forecast Discussion
National Weather Service Greenville-Spartanburg SC
204 PM EDT Fri Sep 1 2017
.SYNOPSIS...
Numerous rounds of showers and potentially severe thunderstorms are
expected this evening as the remnants of Harvey move into the Ohio
Valley and a front persists across western North Carolina. Warmer
and drier high pressure behind Harvey will result in a return to
near normal temperatures by early next week. A cold front will
approach from the west by the middle of next week, increasing rain
chances once again.
&&
.NEAR TERM /THROUGH TONIGHT/...
As of 145 PM EDT: The circulation center of the Harvey remnants have
moved northeast of Nashville, TN early this afternoon and will
continue northeastward toward the Ohio valley tonight, and then
onward to the southern Great Lakes through Saturday. The broad wind
field around the system is producing a southerly low level jet
around 40 kt which will transit the western Carolinas and northeast
GA this afternoon, before very slowly diminishing and veering more
WSW overnight, and then westerly through Saturday. The main hazard
window will be from the current time through mid evening and a TOR
watch has been posted across the eastern Upstate and much of the NC
foothills and piedmont through 9 pm this evening. This watch is
supported by the convection-allowing models which are developing
widespread and robust convection, especially along I-77 through the
late afternoon hours. SBCAPE values are already 1500 to 2000 J/kg in
the watch area and should continue to spike quickly above 2500 J/kg
with heating over the eastern Upstate/CLT area through the late
afternoon hours. In addition, a backdoor cold front appears to be
settling around the I-40 corridor. The best sfc to 6 km bulk shear
values around 50 kt will be over I-77 corridor locations, and sfc to
1 km helicity will likely maximize right along or just south of the
stalled front. Showers will dissipate from the southwest through the
early overnight hours, but might continued over the mountains nearer
the passing remnants.
An upper level jet with strengthen over or just east of the
Appalachians on Saturday as a trough lingers west of the mountain
chain, but profiles will be drier and westerly flow will provide
downsloping east of the mountains. Any deeper moisture for lingering
showers through Saturday will affect mainly the TN border counties.
&&
.SHORT TERM /SATURDAY THROUGH SUNDAY NIGHT/...
As of 250 AM EDT Friday: the short term fcst picks up at 12z on
Saturday with the remnant upper low of Harvey just to our west and
another upper trof digging down across the Western Great Lakes.
As we go into Sunday, the remnants of Harvey will be absorbed by
the above mentioned upper trof as steep upper ridging persists
across the Western CONUS. By late Sunday/early Monday, heights
will have begun to recover as the upper trof lifts NE of the area.
At the sfc, the remnant low that was TS Harvey will be nearly
co-located with the upper low with high pressure centered NE of
the low. Over the next 24 hrs or so, the low will lift well north
of the area and drier high pressure will settle over the CWFA in
its wake. This drier airmass is expected to remain over the area
into early next week. As for the sensible wx, I kept the lingering
PoPs over the fcst area on Sat with a dry fcst for most of Sun,
onward. Temps will start out a few degrees below normal on Sat
and warm to near normal on Sun.
&&
.LONG TERM /MONDAY THROUGH THURSDAY/...
As of 1200 PM EDT Friday: Early AFD today because of the threat of
svr wx this PM. Anyways...the medium range picks up with a
relatively quiet day on Tuesday with a wedge of dry air still in
place over the forecast area. Rapid moistening and height falls will
occur Tuesday night and Wednesday as an upper level trough dives
towards the southeast CONUS and a surface frontal boundary lines up
across the OH River Valley/southern Appalachians. An increase in QPF
response is expected through the day on Wednesday and into the
evening as the front moves southeastward through the forecast area.
Rainfall totals do not look particularly impressive at the moment,
though confidence is increasing in a widespread rain event across
much of the region. Drier air is allowed to work into the forecast
area by Thursday afternoon as the trough axis passes through the
Carolinas, and remains through the end of the medium range. A quick
note about Irma - confidence is increasing in model solutions that
show recurvature of the hurricane back out into the Atlantic,
greatly limiting impacts in our area. Considering it is hurricane
season, though, we encourage everyone to be prepared and remain
aware of the forecast.
Finally, temperatures will begin the period near to just above
average, decreasing to almost 10 degrees below average by the middle
of next week as cloud cover overspreads the area and upper heights
fall.
&&
.AVIATION /18Z FRIDAY THROUGH WEDNESDAY/...
At KCLT: TSRA coverage has increased rapidly around the airfield and
thunderstorms will very gusty winds will be quite likely through at
least 6 pm, with decent chances as late as 9 pm. Expect mainly MVFR
cigs but with IFR conditions under the heaviest downpours along with
gusts to 30 kt or better. Precipitation should taper to showers
through the early morning hours, and MVFR to possibly IFR cigs may
descend from the NW NC piedmont toward daybreak. The rest of
Saturday looks mainly dry with a more SW to W component to the flow.
Elsewhere: Strong TSRA will cross all the airfields, first from KAVL
to KGSP to KAND early this afternoon and then onward to KHKY through
23Z. Expect IFR to MVFR conditions in the heaviest downpours and
gusts to 30 kt or better. Conditions will improve from the southwest
through the evening hours, with lingering SHRA affecting KHKY the
latest overnight. Expect lowering restrictions, likely IFR, to
impact KHKY and possibly KAVL overnight through early Saturday
morning. Conditions will dry further east of the mountains through
Saturday with westerly downsloping flow developing.
Outlook: Drier high pressure will settle overhead late this weekend
into early next week. Another cold front will approach from the
northwest next Tuesday into Wednesday.
Confidence Table...
18-24Z 00-06Z 06-12Z 12-18Z
KCLT High 96% High 94% High 85% High 99%
KGSP High 98% High 100% High 99% High 100%
KAVL High 82% High 94% Med 75% High 82%
KHKY Med 73% Med 65% High 81% High 87%
KGMU High 98% High 100% High 95% High 99%
KAND High 100% High 100% High 100% High 97%
The percentage reflects the number of guidance members agreeing
with the scheduled TAF issuance flight rule category. Complete hourly
experimental aviation forecast consistency tables and ensemble forecasts
are available at the following link:
www.weather.gov/gsp/aviation
&&
.GSP WATCHES/WARNINGS/ADVISORIES...
GA...None.
NC...Wind Advisory until 6 PM EDT this evening for NCZ051-052-058-
059-062-063.
SC...None.
&&
SYNOPSIS...Carroll
NEAR TERM...HG
SHORT TERM...JPT
LONG TERM...Carroll
AVIATION...HG/TDPHazardous Weather Outlook National Weather Service Greenville-Spartanburg SC 208 PM EDT Fri Sep 1 2017 GAZ010-017-018-026-028-029-NCZ033-048>050-053-064-065-505-506-509- 510-SCZ001>006-010>012-019-021815- Rabun-Habersham-Stephens-Franklin-Hart-Elbert-Avery-Madison-Yancey- Mitchell-Buncombe-Transylvania-Henderson-McDowell Mountains- Eastern McDowell-Polk Mountains-Eastern Polk-Oconee Mountains- Pickens Mountains-Greenville Mountains-Greater Oconee- Greater Pickens-Greater Greenville-Anderson-Abbeville-Laurens- Greenwood- 208 PM EDT Fri Sep 1 2017 This Hazardous Weather Outlook is for northeast Georgia, western North Carolina, and the western Upstate of South Carolina. .DAY ONE...This Afternoon and Tonight. Moisture from the remnants of Harvey, coupled with strong winds aloft and an unstable atmosphere, will increase the potential for severe thunderstorms this afternoon. The primary threats will be damaging straight-line winds and isolated tornadoes. Thunderstorm activity will gradually diminish from the southwest this evening. There is also a lingering heavy rain threat, and isolated flash flooding will be possible in any areas repeatedly affected by thunderstorms. .DAYS TWO THROUGH SEVEN...Saturday through Thursday. ..Saturday...No hazardous weather is expected at this time. ..Sunday...No hazardous weather is expected at this time. ..Monday...No hazardous weather is expected at this time. ..Tuesday...No hazardous weather is expected at this time. ..Wednesday...No hazardous weather is expected at this time. ..Thursday...No hazardous weather is expected at this time. .SPOTTER INFORMATION STATEMENT... Skywarn spotters are requested to forward any reports of large hail, damaging winds, tornadoes, or flash flooding to our office. NCZ035>037-056-057-068>072-082-501>504-507-508-SCZ007>009-013-014- 021815- Alexander-Iredell-Davie-Catawba-Rowan-Cleveland-Lincoln-Gaston- Mecklenburg-Cabarrus-Union-Caldwell Mountains-Greater Caldwell- Burke Mountains-Greater Burke-Rutherford Mountains- Greater Rutherford-Spartanburg-Cherokee-York-Chester- 208 PM EDT Fri Sep 1 2017 ...TORNADO WATCH 477 IN EFFECT UNTIL 10 PM EDT THIS EVENING... This Hazardous Weather Outlook is for piedmont North Carolina, western North Carolina and upstate South Carolina. .DAY ONE...This Afternoon and Tonight. Please listen to NOAA Weather Radio or go to weather.gov on the Internet for more information about the following hazards. Tornado Watch. There is also a lingering heavy rain threat, and isolated flash flooding will be possible in any areas repeatedly affected by thunderstorms. .DAYS TWO THROUGH SEVEN...Saturday through Thursday. ..Saturday...No hazardous weather is expected at this time. ..Sunday...No hazardous weather is expected at this time. ..Monday...No hazardous weather is expected at this time. ..Tuesday...No hazardous weather is expected at this time. ..Wednesday...No hazardous weather is expected at this time. ..Thursday...No hazardous weather is expected at this time. .SPOTTER INFORMATION STATEMENT... Skywarn spotters are requested to forward any reports of large hail, damaging winds, tornadoes, or flash flooding to our office. NCZ051-052-058-059-062-063-021815- Swain-Haywood-Graham-Northern Jackson-Macon-Southern Jackson- 208 PM EDT Fri Sep 1 2017 ...WIND ADVISORY IN EFFECT UNTIL 6 PM EDT THIS EVENING... This Hazardous Weather Outlook is for western North Carolina. .DAY ONE...This Afternoon and Tonight. Please listen to NOAA Weather Radio or go to weather.gov on the Internet for more information about the following hazards. Wind Advisory. Moisture from the remnants of Harvey, coupled with strong winds aloft and an unstable atmosphere, will increase the potential for severe thunderstorms this afternoon. The primary threats will be damaging straight-line winds and isolated tornadoes. Thunderstorm activity will gradually diminish from the southwest this evening. There is also a lingering heavy rain threat, and isolated flash flooding will be possible in any areas repeatedly affected by thunderstorms. .DAYS TWO THROUGH SEVEN...Saturday through Thursday. ..Saturday...No hazardous weather is expected at this time. ..Sunday...No hazardous weather is expected at this time. ..Monday...No hazardous weather is expected at this time. ..Tuesday...No hazardous weather is expected at this time. ..Wednesday...No hazardous weather is expected at this time. ..Thursday...No hazardous weather is expected at this time. .SPOTTER INFORMATION STATEMENT... Skywarn spotters are requested to forward any reports of large hail, damaging winds, tornadoes, or flash flooding to our office. HG
Special Weather Statement
National Weather Service Greenville-Spartanburg SC
155 PM EDT FRI SEP 1 2017
NCZ036-037-057-071-072-011830-
Rowan NC-Davie NC-Iredell NC-Cabarrus NC-Mecklenburg NC-
155 PM EDT FRI SEP 1 2017
...A STRONG THUNDERSTORM WILL IMPACT NORTHWESTERN CABARRUS...CENTRAL
DAVIE...SOUTHEASTERN IREDELL...NORTH CENTRAL MECKLENBURG AND WESTERN
ROWAN COUNTIES UNTIL 230 PM EDT...
At 154 PM EDT, Doppler radar was tracking a strong thunderstorm 7
miles west of Kannapolis, or 4 miles southeast of Mooresville, moving
northeast at 35 mph.
Locations to be impacted include...
Kannapolis, Salisbury, Mocksville, Mooresville, Davidson, China
Grove, Spencer, Landis, Enochville and Cooleemee.
Wind gusts up to 50 mph and half inch hail will be possible in these
areas.
A tornado watch remains in effect until 1000 PM EDT for the Piedmont
of North Carolina.
LAT...LON 3540 8073 3552 8090 3598 8050 3589 8037
3589 8040 3588 8042 3587 8039 3584 8039
3585 8042 3583 8043 3583 8046 3584 8047
3583 8049 3581 8047 3579 8048 3577 8045
3574 8046 3572 8042 3572 8034
TIME...MOT...LOC 1754Z 219DEG 31KT 3553 8076
WJMSpecial Weather Statement
National Weather Service Greenville-Spartanburg SC
205 PM EDT FRI SEP 1 2017
SCZ002-003-005-006-010-011830-
Pickens Mountains SC-Greater Pickens SC-Anderson SC-
Greenville Mountains SC-Greater Greenville SC-
205 PM EDT FRI SEP 1 2017
...A CLUSTER OF THUNDERSTORMS WILL IMPACT NORTHEASTERN GREENVILLE...
NORTHWESTERN ANDERSON AND EASTERN PICKENS COUNTIES UNTIL 230 PM
EDT...
At 204 PM EDT, Doppler radar indicated the leading edge of a cluster
of thunderstorms along a line extending from 11 miles south of
Hendersonville to 5 miles northeast of Clemson, and moving northeast
at 30 mph.
Locations to be impacted include...
Greenville Downtown, Easley, Clemson, Greenville Eastside, West
Greenville, Taylors, Berea, Welcome, Powdersville and Travelers Rest.
Wind gusts up to 45 mph and very heavy rainfall rates up to 2 inches
per hour will be possible in these areas.
A tornado watch remains in effect until 1000 PM EDT for Upstate South
Carolina.
LAT...LON 3461 8285 3517 8248 3517 8245 3516 8246
3517 8244 3521 8239 3520 8238 3519 8238
3518 8237 3520 8224 3519 8222 3500 8222
3481 8235
TIME...MOT...LOC 1804Z 239DEG 25KT 3515 8244 3472 8273Special Weather Statement
National Weather Service Greenville-Spartanburg SC
214 PM EDT FRI SEP 1 2017
NCZ071-082-SCZ009-014-011845-
Union NC-Mecklenburg NC-York SC-Chester SC-
214 PM EDT FRI SEP 1 2017
...A STRONG THUNDERSTORM WILL IMPACT SOUTHEASTERN MECKLENBURG...
WESTERN UNION...EASTERN CHESTER AND SOUTHEASTERN YORK COUNTIES UNTIL
245 PM EDT...
At 214 PM EDT, Doppler radar was tracking a strong thunderstorm 6
miles east of Chester, or 4 miles southwest of Richburg, moving
northeast at 45 mph.
Locations to be impacted include...
Monroe, Chester, Rock Hill, South Charlotte, Matthews, Indian Trail,
Weddington, Stallings, Wesley Chapel and Waxhaw.
Wind gusts up to 50 mph and half inch hail will be possible in these
areas.
A tornado watch remains in effect until 1000 PM EDT for the Piedmont
of North Carolina...and Upstate South Carolina.
LAT...LON 3482 8075 3482 8080 3494 8078 3498 8083
3496 8087 3484 8087 3482 8090 3479 8088
3472 8087 3457 8106 3469 8123 3504 8090
3501 8091 3496 8088 3499 8083 3505 8089
3520 8075 3502 8050
TIME...MOT...LOC 1814Z 221DEG 38KT 3469 8110
WJMSpecial Weather Statement
National Weather Service Greenville-Spartanburg SC
218 PM EDT FRI SEP 1 2017
GAZ028-SCZ010-011900-
Hart GA-Anderson SC-
218 PM EDT FRI SEP 1 2017
...A CLUSTER OF THUNDERSTORMS WILL IMPACT HART AND ANDERSON COUNTIES
UNTIL 300 PM EDT...
At 217 PM EDT, Doppler radar indicated the leading edge of a cluster
of thunderstorms along a line extending from 6 miles southwest of
Easley to 10 miles northeast of Hartwell to 10 miles northwest of
Elberton, and moving northeast at 30 mph.
Locations to be impacted include...
Anderson, Hartwell, Homeland Park, Powdersville, Piedmont,
Williamston, Northlake, Reed Creek, West Pelzer and Starr.
Wind gusts up to 45 mph and very heavy rainfall rates up to 2 inches
per hour will be possible in these areas.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
These storms may intensify, so be certain to monitor local radio and
tv stations, as well as local cable tv outlets for additional
information and possible warnings from the National Weather Service.
&&
LAT...LON 3423 8300 3423 8304 3447 8293 3469 8275
3482 8248 3478 8245 3466 8247 3462 8245
3433 8270 3429 8277 3425 8291 3421 8298
TIME...MOT...LOC 1817Z 226DEG 26KT 3475 8266 3446 8282 3420 8300
CSHSpecial Weather Statement
National Weather Service Greenville-Spartanburg SC
221 PM EDT FRI SEP 1 2017
NCZ036-069>072-SCZ009-011845-
Gaston NC-Iredell NC-Lincoln NC-Cabarrus NC-Mecklenburg NC-York SC-
221 PM EDT FRI SEP 1 2017
...A STRONG THUNDERSTORM WILL IMPACT WESTERN CABARRUS...SOUTH CENTRAL
IREDELL...SOUTHEASTERN LINCOLN...MECKLENBURG...EASTERN GASTON AND
NORTHEASTERN YORK COUNTIES UNTIL 245 PM EDT...
At 221 PM EDT, Doppler radar was tracking a strong thunderstorm 10
miles south of Uptown Charlotte, or over Pineville, moving northeast
at 45 mph.
Locations to be impacted include...
Uptown Charlotte, Huntersville, Downtown Concord, Kannapolis, Central
Charlotte, South Charlotte, Northeast Charlotte, Southwest Charlotte,
East Charlotte and Northwest Charlotte.
Wind gusts up to 45 mph and half inch hail will be possible in these
areas.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
This storm may intensify, so be certain to monitor local radio and tv
stations, as well as local cable tv outlets for additional
information and possible warnings from the National Weather Service.
&&
A tornado watch remains in effect until 1000 PM EDT for the Piedmont
of North Carolina...and Upstate South Carolina.
LAT...LON 3500 8084 3508 8091 3503 8090 3501 8091
3498 8089 3518 8108 3560 8093 3551 8074
3551 8073 3538 8043
TIME...MOT...LOC 1821Z 221DEG 38KT 3509 8090
WJMSpecial Weather Statement
National Weather Service Greenville-Spartanburg SC
228 PM EDT FRI SEP 1 2017
NCZ065-507>510-SCZ003-006-007-011915-
Greater Rutherford NC-Henderson NC-Polk Mountains NC-
Rutherford Mountains NC-Eastern Polk NC-Greenville Mountains SC-
Spartanburg SC-Greater Greenville SC-
228 PM EDT FRI SEP 1 2017
...A CLUSTER OF THUNDERSTORMS WILL IMPACT WESTERN RUTHERFORD...
HENDERSON...POLK...GREENVILLE AND NORTHWESTERN SPARTANBURG COUNTIES
UNTIL 315 PM EDT...
At 228 PM EDT, Doppler radar indicated the leading edge of a cluster
of thunderstorms along a line extending from 3 miles north of
Hendersonville to 8 miles southwest of Columbus to 4 miles south of
Easley, and moving east at 20 mph.
Locations to be impacted include...
Greenville Downtown, Hendersonville, Columbus, Greenville Eastside,
West Greenville, Greer, Mauldin, Taylors, Berea and Welcome.
Wind gusts up to 45 mph and very heavy rainfall rates up to 2 inches
per hour will be possible in these areas.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
These storms may intensify, so be certain to monitor local radio and
tv stations, as well as local cable tv outlets for additional
information and possible warnings from the National Weather Service.
&&
A tornado watch remains in effect until 1000 PM EDT for western North
Carolina...and Upstate South Carolina.
LAT...LON 3520 8196 3476 8226 3472 8246 3478 8245
3482 8249 3488 8249 3494 8252 3515 8253
3541 8258 3547 8242 3546 8237 3548 8237
3550 8233 3546 8225 3550 8222 3552 8223
3552 8214 3554 8208
TIME...MOT...LOC 1828Z 248DEG 19KT 3538 8245 3517 8232 3476 8259
CSHThe Greer radar (KGSP), 134 km away, was scanning. The volume nearest the first event began at 18:32 UTC.
5 thunderstorm wind, 1 heavy rain, 1 hail, 1 flash flood. Local standard time, as filed.
FD reported multiple power lines blown down on the southeast side of Charlotte.
Media reported multiple power lines blown down in downtown Landis.
County comms reported several trees blown down on Little Farm Road and another tree down on the west side of Troutman.
County comms reported a small area of poor drainage flooding developed after around 3 inches of rain fell over the Statesville area in a short period of time. Standing water up to the hoods of vehicles was reported on Highway 70 near I-77.
FD reported a few trees blown down north of Thermal City.
Public reported golf ball size hail between Davidson-Concord Rd and East Rocky River Rd.
Multiple sources reported flash flooding developed in the Cornelius and Huntersville areas after repeating, slow-moving thunderstorms produced up to 4 inches of rain in the area in just a couple of hours. Public reported (via Social Media) Caldwell Station Creek, or one of its tributaries flooded a portion of Bailey Rd. A family member of an NWS employee reported a tributary of McDowell Creek flooded Sedgebrook Ln within an apartment complex. Law enforcement also reported Highway 115 was closed just north of Mayes Rd due to flooding.
Local law enforcement reported several trees and some power lines blown down in Concord.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in North Carolina in 2017Every state in 2017This day in weather historyWarnings in North Carolina, September 2017
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 721732, 721733, 721734, 723039, 722049, 722052, 723037, 722051.