Alert archive / North Carolina / Flash Flood Watches in 2021

Flash Flood Watch 9, NWS Greenville-Spartanburg, SC

September 20, 2021Habersham County, Rabun County, Georgia; 13 counties in North Carolina

NWS Greenville-Spartanburg, SC issued this flash flood watch at Sep 20, 2021, 3:01 PM EDT for Habersham County, Rabun County, Georgia; 13 counties in North Carolina. It took effect at Sep 20, 2021, 8:00 PM EDT. It was in force for 15 hr.

The area

The counties it named.

The facts

Issued
Sep 20, 2021, 3:01 PM EDT (19:01 UTC)
In effect from
Sep 20, 2021, 8:00 PM EDT
Expired
Sep 21, 2021, 10:32 AM EDT
In force
15 hr
Issued by
NWS Greenville-Spartanburg, SC
Flood severity
None

Counties Habersham County, GA, Rabun County, GA, Avery County, NC, Buncombe County, NC, Burke County, NC, Caldwell County, NC, Henderson County, NC, Jackson County, NC, Macon County, NC, McDowell County, NC, Mitchell County, NC, Polk County, NC, Rutherford County, NC, Transylvania County, NC, Yancey County, NC

The radar

The Greer radar (KGSP), 70 km from the middle of the area, began a volume at 19:06 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

Greensboro/Hi Pt, NC (KGSO), launched 12:00Z, 7.0 hours before the alert went out and 242 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.

Skew-T log-pSkew-T log-p diagram, Greensboro/Hi Pt, NC at 12:00Z on 2021-09-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 48 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Greensboro/Hi Pt, NC at 12:00Z on 2021-09-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 16 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
48 J/kg
Mixed-layer CIN
-44 J/kg
Mixed-layer LCL
789 m above ground
0-6 km bulk shear
15 kt
0-1 km storm-relative helicity
16 m²/s²
0-3 km storm-relative helicity
20 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

527 
WGUS62 KGSP 201901
FFAGSP

URGENT - IMMEDIATE BROADCAST REQUESTED
Flood Watch
National Weather Service Greenville-Spartanburg SC
301 PM EDT Mon Sep 20 2021

.Abundant moisture across the region will lead to widespread 
rain, especially over the mountains and adjacent foothills  
through the middle of the week.

GAZ010-017-NCZ062>065-507>510-SCZ001>003-210315-
/O.NEW.KGSP.FF.A.0009.210921T0000Z-210922T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Rabun-Habersham-Macon-Southern Jackson-Transylvania-Henderson-
Rutherford Mountains-Greater Rutherford-Polk Mountains-Eastern Polk-
Oconee Mountains-Pickens Mountains-Greenville Mountains-
Including the cities of Forest City, Tigerville, Westminster, 
Brevard, Pumpkintown, Hollywood, East Flat Rock, Mountain Rest, 
Clarkesville, Columbus, Tryon, Saluda, Mountain City, Clayton, 
Gowensville, Chimney Rock State Park, Cashiers, Cedar Mountain, 
Rutherfordton, Little River, Rainbow Springs, Highlands, Spindale, 
Pine Mountain, Mill Spring, Cleveland, Kyle, Walhalla, Wolf 
Mountain, Franklin, Etowah, Dana, Slater-Marietta, Tuxedo, Demorest, 
Hendersonville, Fletcher, Cornelia, and Baldwin
301 PM EDT Mon Sep 20 2021

...FLASH FLOOD WATCH IN EFFECT FROM 8 PM EDT THIS EVENING THROUGH 
TUESDAY EVENING...

The National Weather Service in Greenville-Spartanburg has issued a

* Flash Flood Watch for portions of northeast Georgia, western North 
  Carolina and upstate South Carolina, including the following 
  areas, in northeast Georgia, Habersham and Rabun. In western North 
  Carolina, Eastern Polk, Greater Rutherford, Henderson, Macon, Polk 
  Mountains, Rutherford Mountains, Southern Jackson and 
  Transylvania. In upstate South Carolina, Greenville Mountains, 
  Oconee Mountains and Pickens Mountains.

* From 8 PM EDT this evening through Tuesday evening.

* A plume of sub-tropical moisture will surge into the area tonight 
  into Tuesday. Upslope flow will provide periods of heavy rainfall, 
  especially along the southern Blue Ridge Escarpment. Rainfall will 
  be ongoing between this evening and throughout the day Tuesday. 
  Rainfall amounts will be 2-4" with locally higher amounts possible 
  through Tuesday.

* With the amount of rainfall expected, this could cause rapid rises 
  in streams and creeks. Minor mainstem river flooding can't be 
  ruled out especially in the Upper French Broad River Valley. Urban 
  flooding will be possible as well, mainly in poor drainage and 
  low-lying areas.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Rainfall of more than five inches in similar storms has been 
associated with an increased risk of landslides and rockslides. If 
you live on a mountainside or in a cove at the base of a mountain, 
especially near a stream, be ready to leave in advance of the storm 
or as quickly as possible should rising water, moving earth, or 
rocks threaten. Consider postponing travel along mountain roads 
during periods of heavy rainfall.

&&

$$

CAC
3 follow-up statements
944 
WGUS62 KGSP 210148
FFAGSP

URGENT - IMMEDIATE BROADCAST REQUESTED
Flood Watch
National Weather Service Greenville-Spartanburg SC
948 PM EDT Mon Sep 20 2021

.Abundant moisture across the region will lead to widespread 
rain, especially over the mountains and North Carolina foothills  
through the middle of the week.

NCZ033-049-050-053-501>506-211000-
/O.EXA.KGSP.FF.A.0009.000000T0000Z-210922T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Avery-Yancey-Mitchell-Buncombe-Caldwell Mountains-Greater Caldwell-
Burke Mountains-Greater Burke-McDowell Mountains-Eastern McDowell-
Including the cities of Banner Elk, Nebo, Lenoir, Burnsville, 
Dysartsville, Jonas Ridge, Woodlawn, Morganton, Newland, Celo, 
Ashford, Sugar Hill, Micaville, Patterson, Ingalls, Asheville, Old 
Fort, Candler, Spruce Pine, Ramseytown, Poplar, Kings Creek, Swiss, 
Pleasant Grove, Black Mountain, Busick, Fero, Sawmills, Glenwood, 
Marion, Granite Falls, and Valdese
948 PM EDT Mon Sep 20 2021

...FLASH FLOOD WATCH IN EFFECT THROUGH TUESDAY EVENING...

The National Weather Service in Greenville-Spartanburg has expanded 
the

* Flash Flood Watch to include a portion of western North Carolina, 
  including the following areas, Avery, Buncombe, Burke Mountains, 
  Caldwell Mountains, Eastern McDowell, Greater Burke, Greater 
  Caldwell, McDowell Mountains, Mitchell and Yancey.

* Through Tuesday evening.

* A plume of sub-tropical moisture will continue to overspread the 
  area tonight into Tuesday. Upslope flow will result in periods of 
  heavy rainfall, especially along the Blue Ridge Escarpment. The 
  peak of the heavy rainfall is expected throughout the daylight 
  hours Tuesday.  Rainfall totals of 2-4" with locally higher 
  amounts are expected through Tuesday.

* With the amount of rainfall expected, rapid rises will occur along 
  smaller creeks and streams, with some likely overflowing their 
  banks into low-lying areas and roads. Minor mainstem river 
  flooding can't be ruled out. Urban flooding will be possible as 
  well, mainly in poor drainage and low-lying areas.

$$

GAZ010-017-NCZ062>065-507>510-SCZ001>003-211000-
/O.CON.KGSP.FF.A.0009.000000T0000Z-210922T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Rabun-Habersham-Macon-Southern Jackson-Transylvania-Henderson-
Rutherford Mountains-Greater Rutherford-Polk Mountains-Eastern Polk-
Oconee Mountains-Pickens Mountains-Greenville Mountains-
Including the cities of Forest City, Tigerville, Westminster, 
Brevard, Pumpkintown, Hollywood, East Flat Rock, Mountain Rest, 
Clarkesville, Columbus, Tryon, Saluda, Mountain City, Clayton, 
Gowensville, Chimney Rock State Park, Cashiers, Cedar Mountain, 
Rutherfordton, Little River, Rainbow Springs, Highlands, Spindale, 
Pine Mountain, Mill Spring, Cleveland, Kyle, Walhalla, Wolf 
Mountain, Franklin, Etowah, Dana, Slater-Marietta, Tuxedo, Demorest, 
Hendersonville, Fletcher, Cornelia, and Baldwin
948 PM EDT Mon Sep 20 2021

...FLASH FLOOD WATCH REMAINS IN EFFECT THROUGH TUESDAY EVENING...

The Flash Flood Watch continues for

* Portions of northeast Georgia, western North Carolina and upstate 
  South Carolina, including the following areas, in northeast 
  Georgia, Habersham and Rabun. In western North Carolina, Eastern 
  Polk, Greater Rutherford, Henderson, Macon, Polk Mountains, 
  Rutherford Mountains, Southern Jackson and Transylvania. In 
  upstate South Carolina, Greenville Mountains, Oconee Mountains and 
  Pickens Mountains.

* Through Tuesday evening.

* A plume of sub-tropical moisture will continue to overspread the 
  area tonight into Tuesday. Upslope flow will result in periods of 
  heavy rainfall, especially along the Blue Ridge Escarpment. The 
  peak of the heavy rainfall is expected late tonight through 
  Tuesday morning.  Rainfall totals of 2-4" are expected through 
  Tuesday.

* With the amount of rainfall expected, rapid rises will occur along 
  smaller creeks and streams, with some likely overflowing their 
  banks into low-lying areas and roads. Minor mainstem river 
  flooding can't be ruled out. Urban flooding will be possible as 
  well, mainly in poor drainage and low-lying areas.

$$

Lane
591 
WGUS62 KGSP 210741
FFAGSP

Flood Watch
National Weather Service Greenville-Spartanburg SC
341 AM EDT Tue Sep 21 2021

GAZ010-017-NCZ062-210845-
/O.CAN.KGSP.FF.A.0009.000000T0000Z-210922T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Rabun-Habersham-Macon-
Including the cities of Clarkesville, Highlands, Pine Mountain, 
Demorest, Kyle, Mountain City, Clayton, Franklin, Cornelia, 
Hollywood, Baldwin, and Rainbow Springs
341 AM EDT Tue Sep 21 2021

...FLASH FLOOD WATCH IS CANCELLED...

The Flash Flood Watch for portions of northeast Georgia and western 
North Carolina, including the following areas, in northeast Georgia, 
Habersham and Rabun. In western North Carolina, Macon has been 
cancelled.

The Flood Watch is cancelled. The amount of rainfall today is not 
expected to be enough to cause flooding.

$$

NCZ033-049-050-053-063>065-501>510-SCZ001>003-211545-
/O.CON.KGSP.FF.A.0009.000000T0000Z-210922T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Avery-Yancey-Mitchell-Buncombe-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-
Including the cities of Banner Elk, Nebo, Lenoir, Burnsville, 
Tigerville, Dysartsville, Jonas Ridge, Woodlawn, Morganton, 
Westminster, Newland, Brevard, Ashford, Sugar Hill, Pumpkintown, 
Micaville, East Flat Rock, Mountain Rest, Columbus, Cleveland, 
Patterson, Etowah, Saluda, Forest City, Ingalls, Asheville, 
Glenwood, Gowensville, Chimney Rock State Park, Marion, Cashiers, 
Cedar Mountain, Rutherfordton, Little River, Granite Falls, 
Spindale, Old Fort, Candler, Spruce Pine, Mill Spring, Ramseytown, 
Poplar, Kings Creek, Swiss, Walhalla, Pleasant Grove, Black 
Mountain, Dana, Busick, Slater-Marietta, Tuxedo, Fero, Sawmills, 
Celo, Hendersonville, Fletcher, Tryon, Wolf Mountain, and Valdese
341 AM EDT Tue Sep 21 2021

...FLASH FLOOD WATCH REMAINS IN EFFECT THROUGH THIS EVENING...

The Flash Flood Watch continues for

* Portions of western North Carolina and upstate South Carolina, 
  including the following areas, in western North Carolina, Avery, 
  Buncombe, Burke Mountains, Caldwell Mountains, Eastern McDowell, 
  Eastern Polk, Greater Burke, Greater Caldwell, Greater Rutherford, 
  Henderson, McDowell Mountains, Mitchell, Polk Mountains, 
  Rutherford Mountains, Southern Jackson, Transylvania and Yancey. 
  In upstate South Carolina, Greenville Mountains, Oconee Mountains 
  and Pickens Mountains.

* Through this evening.

* A plume of sub-tropical moisture will move across the region, 
  mainly through the early afternoon. A southeasterly upslope flow 
  will aid in the development of periods of heavy rain, especially 
  along and near the Blue Ridge Escarpment in North Carolina. 
  Rainfall totals of 2 to 3 inches are possible by sunset across the 
  Watch area.

* With the amount of rainfall expected, rapid rises will occur along 
  smaller creeks and streams, with some likely overflowing their 
  banks into low-lying areas and roads. Minor mainstem river 
  flooding can't be ruled out. Urban flooding will be possible as 
  well, mainly in poor drainage and low-lying areas.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Rainfall of up to three inches could be enough to cause some slope 
failures near the Blue Ridge Escarpment. Be careful when driving 
along mountain roads. As always, never attempt to drive through 
flooded roadways, especially where water is flowing over the roadway.

&&

$$

Moore
275 
WGUS62 KGSP 211432
FFAGSP

Flood Watch
National Weather Service Greenville-Spartanburg SC
1032 AM EDT Tue Sep 21 2021

NCZ033-049-050-053-063>065-501>510-SCZ001>003-211545-
/O.CAN.KGSP.FF.A.0009.000000T0000Z-210922T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Avery-Yancey-Mitchell-Buncombe-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-
Including the cities of Banner Elk, Nebo, Lenoir, Burnsville, 
Tigerville, Dysartsville, Jonas Ridge, Woodlawn, Morganton, 
Westminster, Newland, Brevard, Ashford, Sugar Hill, Pumpkintown, 
Micaville, East Flat Rock, Mountain Rest, Columbus, Cleveland, 
Patterson, Etowah, Saluda, Forest City, Ingalls, Asheville, 
Glenwood, Gowensville, Chimney Rock State Park, Marion, Cashiers, 
Cedar Mountain, Rutherfordton, Little River, Granite Falls, 
Spindale, Old Fort, Candler, Spruce Pine, Mill Spring, Ramseytown, 
Poplar, Kings Creek, Swiss, Walhalla, Pleasant Grove, Black 
Mountain, Dana, Busick, Slater-Marietta, Tuxedo, Fero, Sawmills, 
Celo, Hendersonville, Fletcher, Tryon, Wolf Mountain, and Valdese
1032 AM EDT Tue Sep 21 2021

...FLASH FLOOD WATCH IS CANCELLED...

The Flash Flood Watch for portions of western North Carolina and 
upstate South Carolina, including the following areas, in western 
North Carolina, Avery, Buncombe, Burke Mountains, Caldwell 
Mountains, Eastern McDowell, Eastern Polk, Greater Burke, Greater 
Caldwell, Greater Rutherford, Henderson, McDowell Mountains, 
Mitchell, Polk Mountains, Rutherford Mountains, Southern Jackson, 
Transylvania and Yancey. In upstate South Carolina, Greenville 
Mountains, Oconee Mountains and Pickens Mountains has been cancelled.

The Flood Watch is cancelled. Flooding is no longer expected to pose 
a threat. Please continue to heed remaining road closures.

$$

JPT

Nearby

Flash Flood Watches in North Carolina, 2021Flash Flood Watches in Georgia, 2021Flash Flood Watches in South Carolina, 2021Every flash flood 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.