Alert archive / South Carolina / Special Weather Statements in 2020
Special Weather Statement, NWS Greenville-Spartanburg, SC
NWS Greenville-Spartanburg, SC issued this special weather statement at Oct 11, 2020, 6:49 AM EDT for Union County, South Carolina. It was in force for 41 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Oct 11, 2020, 6:49 AM EDT (10:49 UTC)
- Expired
- Oct 11, 2020, 7:30 AM EDT
- In force
- 41 min
- Issued by
- NWS Greenville-Spartanburg, SC
County Union County, SC
The radar
The Greer radar (KGSP), 49 km from the middle of the area, began a volume at 10:50 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.
The nearest sounding before it
Charleston AFB, SC (KCHS), launched 00:00Z, 10.8 hours before the alert went out and 262 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
- 185 J/kg
- Mixed-layer CIN
- -10 J/kg
- Mixed-layer LCL
- 689 m above ground
- 0-6 km bulk shear
- 38 kt
- 0-1 km storm-relative helicity
- 234 m²/s²
- 0-3 km storm-relative helicity
- 307 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted.
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</html>What forecasters said that day
The local office's own words before this special weather statement went out, 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 this special weather statement went out at Oct 11, 4:00 AM EDT, 2 hours 49 minutes earlier.
Area forecast discussion, Oct 11, 4:00 AM EDT, 2 hours 49 minutes before
Area Forecast Discussion
National Weather Service Greenville-Spartanburg SC
400 AM EDT Sun Oct 11 2020
.SYNOPSIS...
The remnants of post tropical system Delta will continue to bring
abundant moisture to the region today before the system moves off
the east coast on Monday. Gradual drying will occur through mid week
despite the approach and passage of a weak front on Tuesday. Drier
high pressure will settle in behind the front Wednesday through
Thursday. A sharper cold front will move through the region on
Friday, with much colder air arriving next weekend.
&&
.NEAR TERM /THROUGH TONIGHT/...
As of 355 AM EDT Sunday: A Flash Flood Watch remains in effect for
portions of the area through this evening.
The latest satellite showed whats left of Delta spinning into
northern Alabama. Deep tropical moisture (precipitable waters near 2
inches) riding a stout 40 kt low level jet continued to support
bands of moderate to heavy rain across the area with the strongest
band pressing east from from northeast Georgia. Rainfall rates of
one to locally three inches per hour have been observed, prompting
the issuance of several short fused flood products. The bands will
continue to press east to northeast, placing much of the escarpment
and foothills in particular under the gun this morning into the
afternoon with additional flash flooding possible.
A weak surface depiction of the remnants of Delta will slide east
along roughly the I-85 corridor this afternoon into tonight. Bands
of moderate to heavy rain will continue to slide east ahead of the
main circulation through this afternoon before gradually waning from
west to east late this afternoon into the evening. Guidance
continues to show the potential for isolated to scattered
thunderstorms as strong southerly flow with some dry air entraining
aloft should support CAPE of 500 to 1000 (locally 1500 possible)
J/kg mainly along and south of I-85, along it may nose northward
into the NC Piedmont. Modest shear and DCAPE values may support a
damaging with threat with stronger thunderstorms. Low end helicity
values, possibly maximized near the eventual track of Delta or along
the eroding wedge boundary also supports the threat of a tornado.
The greatest threat for stronger thunderstorms looks to be late this
morning through early this evening and mainly east of I-26 and along
and south of I-85 as shown in the latest SPC marginal risk area.
Highs today will range from the 60s to near 70 for the I-40
corridor, to the 70s to near 80 further south.
Southerly flow today will back to the west/northwest tonight with
any lingering shower activity becoming confined to the Tennessee
border counties in the mountains and the I-77 corridor. Clearing
skies and the recent rainfall may support fog developing across many
areas. Lows tonight will fall into the 60s for most.
&&
.SHORT TERM /MONDAY THROUGH TUESDAY NIGHT/...
As 330 am EDT Sunday: The passing upper wave associated with the
remnants of post tropical system Delta will be just east of the
forecast area Monday morning and moving quickly toward the coastal
plain. Mid and upper levels will rapidly dry out behind the wave,
but lingering low-level moisture could permit lingering isolated
showers, especially in northern and western sections, Monday into
Monday night ahead of a weak cold front approaching from the
northwest.
Zonal upper flow will set up through Tuesday as the weak cold front
crosses the area from the northwest. Despite any clouds and the weak
fropa, thicknesses will remain high enough for much above climo
temps through the short term period.
&&
.LONG TERM /WEDNESDAY THROUGH SATURDAY/...
As of 345 am EDT Sunday: A passing cold front will settle just
southeast of the area on Wednesday, with generally drier conditions
as a surface high pressure center builds over to the north of the
area. Above climo temps will persist, but perhaps run a few degrees
less than Mon/Tue as thicknesses fall slightly.
A broad eastern trough will then steadily carve out Thursday through
Saturday as an H5 low closes off over Ontario. An associated cold
front will settle through the Ohio Valley on Thursday and reach the
southern Appalachians Thursday night. Isolated showers may form
along and ahead of the cold front late Thursday into Thursday night,
especially in the mountains. The very narrow moisture zone along the
immediate vicinity of the strong cold front should cross the
southern Appalachians Thursday night and settle southeast of the
region on Friday. Much drier and cooler air will follow the frontal
passage and frost/freeze concerns may redevelop across the NC
mountains for next weekend.
&&
.AVIATION /08Z SUNDAY THROUGH THURSDAY/...
At KCLT and elsewhere: Below normal confidence for 06Z TAFs as deep
moisture will support variable flight categories through the period
with at least brief improvement to high MVFR/low VFR possible south
of I-85 after 15Z. Low end gusts are possible at just about anytime.
Isolated TSRA possible mainly after 15Z and mainly along and south
of I-85. A surface low may move through the Piedmont causing at
least a brief wind shift around 18Z near I-26 including KGSP and
KAVL and closer to 00Z for I-77 corridor including KCLT. IFR or
lower cigs/vsbys likely to reform while SHRA decreases in coverage
after 00Z.
Outlook: Expect a return to prevailing VFR conds early next week
with night to early morning flight restrictions possible.
Confidence Table...
08-14Z 14-20Z 20-02Z 02-06Z
KCLT Med 69% Med 70% Med 71% Med 77%
KGSP Med 70% Med 61% High 80% Med 72%
KAVL High 80% Med 72% Med 70% High 80%
KHKY High 89% High 93% Low 56% High 93%
KGMU Med 74% Med 66% High 83% Med 68%
KAND High 87% Med 79% Med 75% Med 70%
The percentage reflects the number of guidance members agreeing
with the scheduled TAF issuance flight rule category. Complete hourly
experimental aviation forecast consistency tables are available at
the following link:
www.weather.gov/gsp/aviation
&&
.GSP WATCHES/WARNINGS/ADVISORIES...
GA...Flash Flood Watch through this evening for GAZ010-017.
NC...Flash Flood Watch through this evening for NCZ033-049-050-052-
053-059-062>065-501>510.
SC...Flash Flood Watch through this evening for SCZ001>003.
&&
SYNOPSIS...HG
NEAR TERM...Munroe
SHORT TERM...HG
LONG TERM...HG
AVIATION...MunroeHazardous weather outlook, Oct 11, 4:50 AM EDT, 1 hour 59 minutes before
Hazardous Weather Outlook National Weather Service Greenville-Spartanburg SC 450 AM EDT Sun Oct 11 2020 GAZ018-026-028-029-NCZ035>037-048-051-056-058-SCZ004>006-010-120900- Stephens-Franklin-Hart-Elbert-Alexander-Iredell-Davie-Madison-Swain- Catawba-Graham-Greater Oconee-Greater Pickens-Greater Greenville- Anderson- 450 AM EDT Sun Oct 11 2020 This Hazardous Weather Outlook is for northeast Georgia, the northwest Piedmont and western mountains of western North Carolina and the western Upstate of South Carolina. .DAY ONE...Today and tonight. Rain showers and embedded thunderstorms associated with the remnants of post-tropical system Delta will continue to impact the area today into tonight. Locally heavy rainfall and isolated flooding of low- lying and poor drainage areas will be possible. The thunderstorms may produce cloud to ground lightning and briefly gusty winds as well. The showers and thunderstorms will steadily diminish from the southwest tonight. .DAYS TWO THROUGH SEVEN...Monday through Saturday. No hazardous weather is expected at this time. .SPOTTER INFORMATION STATEMENT... None. GAZ010-017-NCZ033-049-050-052-053-059-062>065-501>510-SCZ001>003- 120900- Rabun-Habersham-Avery-Yancey-Mitchell-Haywood-Buncombe- Northern Jackson-Macon-Southern Jackson-Transylvania-Henderson- Caldwell Mountains-Greater Caldwell-Burke Mountains-Greater Burke- McDowell Mountains-Eastern McDowell-Rutherford Mountains- Greater Rutherford-Polk Mountains-Eastern Polk-Oconee Mountains- Pickens Mountains-Greenville Mountains- 450 AM EDT Sun Oct 11 2020 ...FLASH FLOOD WATCH IN EFFECT THROUGH THIS EVENING... This Hazardous Weather Outlook is for the mountains of northeast Georgia, the mountains of Upstate South Carolina, and much of the mountains and foothills of western North Carolina. .DAY ONE...Today and tonight. Please listen to NOAA Weather Radio or go to weather.gov on the Internet for more information about the following hazards. Flash Flood Watch. In addition, isolated to scattered thunderstorms will produce occasional cloud-to-ground lightning strikes and gusty winds today into this evening. .DAYS TWO THROUGH SEVEN...Monday through Saturday. No hazardous weather is expected at this time. .SPOTTER INFORMATION STATEMENT... Spotter activation may be needed. Please relay any information about observed flooding or severe weather to the NWS while following all local, state, and CDC guidelines. NCZ057-068>072-082-SCZ007>009-011>014-019-120900- Rowan-Cleveland-Lincoln-Gaston-Mecklenburg-Cabarrus-Union NC- Spartanburg-Cherokee-York-Abbeville-Laurens-Union SC-Chester- Greenwood- 450 AM EDT Sun Oct 11 2020 This Hazardous Weather Outlook is for Piedmont North Carolina, including the Charlotte Metro Area, and much of Upstate South Carolina. .DAY ONE...Today and tonight. Periods of heavy rainfall associated with the remnants of post tropical system Delta will continue to impact the area today into tonight. Streams and main stem rivers will see sharp rises. Localized flooding of low-lying and poor drainage areas will be possible. Some of the thunderstorms may become severe this afternoon and evening, especially in locations southeast of I-85, and particularly south and east of Charlotte. Damaging wind gusts will be the main threat, but a few brief tornadoes are possible as well. The showers and thunderstorms will diminish from the southwest tonight. .DAYS TWO THROUGH SEVEN...Monday through Saturday. No hazardous weather is expected at this time. .SPOTTER INFORMATION STATEMENT... Spotter activation may be needed. Please relay any information about observed severe weather to the NWS while following all local, state, and CDC guidelines. HG
In the hours before
Special weather statement, Oct 11, 5:00 AM EDT, 1 hour 49 minutes before
Special Weather Statement
National Weather Service Greenville-Spartanburg SC
500 AM EDT Sun Oct 11 2020
SCZ011-019-110945-
Abbeville SC-Greenwood SC-
500 AM EDT Sun Oct 11 2020
...A STRONG THUNDERSTORM WILL IMPACT ABBEVILLE AND NORTHWESTERN
GREENWOOD COUNTIES UNTIL 545 AM EDT...
At 459 AM EDT, Doppler radar was tracking a strong thunderstorm 7
miles southwest of Abbeville, moving northeast at 25 mph.
Locations to be impacted include...
Greenwood, Abbeville, Ware Shoals, Due West, Donalds, Cokesbury,
Hodges, Shoals Junction, Lake Greenwood and Calhoun Falls.
Wind gusts up to 40 mph and very heavy rainfall rates up to 2 inches
per hour will be possible in these areas. Deep ponding of water will
develop in low-lying and poor drainage areas, and isolated flooding
is possible.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
The combination of gusty winds and saturated soil conditions will
cause scattered trees and power lines to fall. Seek shelter inside an
interior room.
&&
LAT...LON 3406 8233 3406 8244 3408 8248 3406 8255
3412 8262 3446 8231 3438 8221 3437 8218
3433 8217 3432 8214 3431 8212 3430 8208
3424 8201 3424 8198 3404 8232
TIME...MOT...LOC 0859Z 223DEG 22KT 3410 8245
HGSpecial weather statement, Oct 11, 5:47 AM EDT, 1 hour 2 minutes before
Special Weather Statement
National Weather Service Greenville-Spartanburg SC
547 AM EDT Sun Oct 11 2020
SCZ012-019-111030-
Laurens SC-Greenwood SC-
547 AM EDT Sun Oct 11 2020
...A STRONG THUNDERSTORM WILL IMPACT CENTRAL LAURENS AND NORTHWESTERN
GREENWOOD COUNTIES UNTIL 630 AM EDT...
At 547 AM EDT, Doppler radar was tracking a strong thunderstorm 4
miles northwest of Greenwood, or near Cokesbury, moving northeast at
25 mph.
Locations to be impacted include...
Greenwood, Laurens, Clinton, Ware Shoals, Joanna, Gray Court, Cross
Hill, Cokesbury, Waterloo and Hodges.
Wind gusts up to 40 mph and very heavy rainfall rates up to 2 inches
per hour will be possible in these areas.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
The combination of gusty winds and saturated soil conditions will
cause scattered trees and power lines to fall. Seek shelter inside an
interior room.
Doppler radar indicates weak rotation with this storm. Spin-up of a
very brief, weak tornado cannot be ruled out. Be prepared to take
immediate action if a tornado is sighted or a Tornado Warning is
issued.
&&
LAT...LON 3413 8218 3418 8224 3421 8224 3424 8226
3427 8229 3428 8231 3432 8232 3439 8227
3441 8225 3442 8225 3465 8210 3441 8175
3440 8176
TIME...MOT...LOC 0947Z 224DEG 24KT 3425 8220
HGLocal storm report, Oct 11, 5:50 AM EDT, 59 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
550 AM EDT SUN OCT 11 2020
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0410 AM FLASH FLOOD CLAYTON 34.88N 83.40W
10/11/2020 RABUN GA 911 CALL CENTER
RABUN COUNTY 911 REPORTED NUMEROUS ROADS WERE FLOODED
ACROSS THE COUNTY INCLUDING: SHADY LN AND OLD US 441 IN
LAKEMONT AND GA 15 IN CLAYTON. A FEW MUDSLIDES OF UNKNOWN SIZE
WERE ALSO REPORTED, IMPACTING ROADWAYS.
&&
JMPLocal storm report, Oct 11, 5:51 AM EDT, 58 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
551 AM EDT SUN OCT 11 2020
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0430 AM FLASH FLOOD CLARKESVILLE 34.62N 83.52W
10/11/2020 HABERSHAM GA 911 CALL CENTER
HABERSHAM COUNTY 911 REPORTED NUMEROUS ROADS CLOSED
ACROSS THE COUNTY, TWO WATER RESCUES, AND FLOODWATERS
APPROACHING A FEW HOMES.
&&
JMPLocal storm report, Oct 11, 6:39 AM EDT, 10 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
639 AM EDT SUN OCT 11 2020
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0530 AM FLASH FLOOD 3 W DEMOREST 34.57N 83.60W
10/11/2020 HABERSHAM GA 911 CALL CENTER
HABERSHAM COUNTY 911 REPORTED AN ONGOING WATER RESCUE FOR
PEOPLE TRAPPED IN A FLOODED HOME AT 140 RIVER WAY, ADJACENT TO
THE SOQUE RIVER.
&&
JMPSpecial weather statement, Oct 11, 6:49 AM EDT, 0 minutes before
Special Weather Statement
National Weather Service Greenville-Spartanburg SC
649 AM EDT Sun Oct 11 2020
SCZ007-012-013-111130-
Laurens SC-Union SC-Spartanburg SC-
649 AM EDT Sun Oct 11 2020
...A STRONG THUNDERSTORM WILL IMPACT CENTRAL LAURENS...SOUTHEASTERN
SPARTANBURG AND UNION COUNTIES UNTIL 730 AM EDT...
At 649 AM EDT, Doppler radar was tracking a strong thunderstorm 7
miles northeast of Laurens, or 5 miles northwest of Clinton, moving
northeast at 25 mph.
Locations to be impacted include...
Union, Laurens, Clinton, Pacolet, Monarch Mill, Buffalo, Jonesville,
Pacolet Mills, Croft State Park and Rose Hill State Park.
Wind gusts up to 40 mph and very heavy rainfall rates up to 2 inches
per hour will be possible in these areas.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
The combination of gusty winds and saturated soil conditions will
cause scattered trees and power lines to fall. Seek shelter inside an
interior room.
Doppler radar indicates weak rotation with this storm. Spin-up of a
very brief, weak tornado cannot be ruled out. Be prepared to take
immediate action if a tornado is sighted or a Tornado Warning is
issued.
&&
LAT...LON 3456 8205 3495 8182 3492 8172 3491 8170
3491 8169 3490 8164 3488 8164 3488 8160
3484 8146 3482 8149 3481 8147 3480 8146
3441 8186
TIME...MOT...LOC 1049Z 221DEG 23KT 3455 8191
HGThe office that day
Everything else NWS Greenville-Spartanburg, SC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Oct 11, 2:49 AM EDT | Areal Flood Advisory | GSP | Jackson, Macon | 6 hr |
| Oct 11, 3:54 AM EDT | River Flood Advisory | GSP | Henderson, Transylvania | 61 hr |
| Oct 11, 5:24 AM EDT | Areal Flood Advisory | GSP | Henderson, Transylvania | 18 hr |
| Oct 11, 7:18 AM EDT | River Flood Advisory | GSP | Buncombe, Henderson | 15 hr |
| Oct 11, 8:23 AM EDT | Areal Flood Advisory | GSP | Macon, Swain | 7 hr |
| Oct 11, 9:29 AM EDT | Areal Flood Advisory | GSP | Burke, Caldwell, Catawba | 2 hr |
| Oct 11, 9:39 AM EDT | Areal Flood Advisory | GSP | Burke, Caldwell | 7 hr |
| Oct 11, 9:47 AM EDT | River Flood Warning | GSP | Henderson, Transylvania | 28 hr |
| Oct 11, 12:10 PM EDT | Special Weather Statement | GSP | Union | 35 min |
| Oct 11, 12:12 PM EDT | Areal Flood Advisory | GSP | Cabarrus, Mecklenburg | 9 hr |
| Oct 11, 12:22 PM EDT | Areal Flood Advisory | GSP | Catawba, Lincoln | 5 hr |
| Oct 11, 3:53 PM EDT | Areal Flood Advisory | GSP | Rowan | 11 hr |
| Oct 11, 6:20 PM EDT | Special Weather Statement | GSP | Mecklenburg | 40 min |
| Oct 11, 6:50 PM EDT | Tornado Warning | GSP | Mecklenburg, Union | 25 min |
| Oct 11, 2:01 AM EDT | Areal Flood Advisory | GSP | Oconee | 8 hr |
| Oct 11, 5:00 AM EDT | Special Weather Statement | GSP | Abbeville, Greenwood | 45 min |
| Oct 11, 5:47 AM EDT | Special Weather Statement | GSP | Laurens | 43 min |
| Oct 11, 6:13 AM EDT | Tornado Warning | GSP | Laurens, Spartanburg, Union | 47 min |
| Oct 11, 6:54 AM EDT | Tornado Warning | GSP | Cherokee, Laurens, Spartanburg, Union | 51 min |
| Oct 11, 7:54 AM EDT | Special Weather Statement | GSP | Union | 36 min |
| Oct 11, 8:29 AM EDT | Special Weather Statement | GSP | Chester, York | 31 min |
| Oct 11, 9:09 AM EDT | Special Weather Statement | GSP | Chester | 51 min |
| Oct 11, 10:16 AM EDT | Special Weather Statement | GSP | Chester | 14 min |
| Oct 11, 4:46 PM EDT | Tornado Warning | GSP | Chester, York | 29 min |
| Oct 11, 5:10 PM EDT | Tornado Warning | GSP | Chester, York | 35 min |
| Oct 11, 6:48 PM EDT | Areal Flood Advisory | GSP | York | 117 min |
| Oct 10, 11:33 PM EDT | Areal Flood Advisory | GSP | Habersham | 3 hr |
| Oct 11, 12:48 AM EDT | Flash Flood Warning | GSP | Habersham | 8 hr |
| Oct 11, 12:56 AM EDT | Special Weather Statement | GSP | Stephens | 49 min |
| Oct 11, 1:31 AM EDT | Areal Flood Advisory | GSP | Rabun | 83 min |
| Oct 11, 2:19 AM EDT | Flash Flood Warning | GSP | Habersham, Rabun | 6 hr |
| Oct 11, 7:59 AM EDT | Areal Flood Warning | GSP | Habersham | 16 hr |
| Oct 11, 8:13 AM EDT | Areal Flood Warning | GSP | Habersham, Rabun | 57 hr |
Nearby
Special Weather Statements in South Carolina, 2020Every special weather statement in 2020
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.