Alert archive / North Carolina / Flash Flood Warnings in 2021

Flash Flood Warning 11, NWS Greenville-Spartanburg, SC

August 16, 2021Jackson County, Transylvania County, North Carolina

NWS Greenville-Spartanburg, SC issued this flash flood warning at Aug 16, 2021, 4:39 AM EDT for Jackson County, Transylvania County, North Carolina. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Aug 16, 2021, 4:39 AM EDT (08:39 UTC)
Expired
Aug 16, 2021, 7:45 AM EDT
In force
3 hr
Issued by
NWS Greenville-Spartanburg, SC
Area
Storm-based polygon
Flood severity
None

Counties Jackson County, NC, Transylvania County, NC

The radar

The Greer radar (KGSP), 73 km from the middle of the area, began a volume at 08:41 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

Peachtre/Fal Fld, GA (KFFC), launched 00:00Z, 8.7 hours before the alert went out and 238 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, Peachtre/Fal Fld, GA at 00:00Z on 2021-08-16Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 919 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, Peachtre/Fal Fld, GA at 00:00Z on 2021-08-16The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 11 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
919 J/kg
Mixed-layer CIN
-9 J/kg
Mixed-layer LCL
972 m above ground
0-6 km bulk shear
6 kt
0-1 km storm-relative helicity
11 m²/s²
0-3 km storm-relative helicity
31 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

574 
WGUS52 KGSP 160839
FFWGSP
NCC099-175-161145-
/O.NEW.KGSP.FF.W.0011.210816T0839Z-210816T1145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Greenville-Spartanburg SC
439 AM EDT Mon Aug 16 2021

The National Weather Service in Greenville-Spartanburg has issued a

* Flash Flood Warning for...
  South Central Jackson County in western North Carolina...
  Southwestern Transylvania County in western North Carolina...

* Until 745 AM EDT.

* At 439 AM EDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 2 and 4 inches of rain 
  have fallen. Additional rainfall amounts up to 2 inches are 
  possible in the warned area. Flash flooding is ongoing or expected 
  to begin shortly.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Radar.

  IMPACT...Flash flooding of small creeks and streams, urban
           areas, highways, streets and underpasses as well as
           other poor drainage and low-lying areas.

* Some locations that will experience flash flooding include...
  Rosman, Gorges State Park, Jocassee Gorges, Lake Jocassee, 
  Sapphire and Connestee.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

Be especially cautious at night when it is harder to recognize the 
dangers of flooding.

&&

LAT...LON 3502 8306 3505 8309 3516 8305 3511 8304
      3509 8300 3511 8294 3523 8282 3510 8269

FLASH FLOOD...RADAR INDICATED

$$

Krentz
1 follow-up statement
960 
WGUS72 KGSP 160926
FFSGSP

Flash Flood Statement
National Weather Service Greenville-Spartanburg SC
526 AM EDT Mon Aug 16 2021

NCC099-175-161145-
/O.CON.KGSP.FF.W.0011.000000T0000Z-210816T1145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Jackson NC-Transylvania NC-
526 AM EDT Mon Aug 16 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 745 AM EDT THIS 
MORNING FOR SOUTH CENTRAL JACKSON AND SOUTHWESTERN TRANSYLVANIA 
COUNTIES...

At 526 AM EDT, Doppler radar and automated rain gauges indicated 
thunderstorms producing heavy rain in the mountains above the warned 
area. Between 4 and 6 inches of rain have fallen in the headwaters 
of the French Broad River since 2 am. Additional rainfall amounts of 
1 to 2 inches are possible in the northwestern part of Transylvania 
County above Rosman.  Flash flooding is ongoing or expected to begin 
shortly.

HAZARD...Flash flooding caused by thunderstorms.

SOURCE...Radar and automated gauges.

IMPACT...Flash flooding of small creeks and streams, urban areas,
         highways, streets and underpasses as well as other poor
         drainage and low-lying areas.

Some locations that will experience flash flooding include...
  Rosman, Gorges State Park, Jocassee Gorges, Lake Jocassee, 
  Sapphire and Connestee.

The headwaters of the French Broad River above Blantyre will 
continue to see rapid rises.  In particular, at Rosman, the river 
gauge was already up to 10.2 feet and rising rapidly at 515 am.  At 
a level of 10 feet, Hannah Ford Road will be flooded with is located 
between Rosman and Brevard.

The river at Rosman will approach 11 feet by sunrise.  At 11 feet, 
the river will approach homes along Depot Street in Rosman. Flood 
waters would inundate US 178 near the river gauge site.

 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

Be especially cautious at night when it is harder to recognize the 
dangers of flooding.

&&

LAT...LON 3502 8306 3505 8309 3516 8305 3511 8304
      3509 8300 3511 8294 3523 8282 3510 8269

FLASH FLOOD...RADAR AND GAUGE INDICATED

$$

Moore

The office that day

Everything else NWS Greenville-Spartanburg, SC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 15, 8:06 PM EDTSpecial Weather StatementGSPCleveland24 min
Aug 15, 8:07 PM EDTSpecial Weather StatementGSPTransylvania23 min
Aug 15, 8:09 PM EDTSpecial Weather StatementGSPMcDowell36 min
Aug 15, 8:18 PM EDTSpecial Weather StatementGSPRutherford27 min
Aug 15, 8:30 PM EDTSpecial Weather StatementGSPCatawba, Lincoln30 min
Aug 15, 8:53 PM EDTSpecial Weather StatementGSPTransylvania52 min
Aug 15, 9:05 PM EDTSpecial Weather StatementGSPCatawba25 min
Aug 15, 9:18 PM EDTSpecial Weather StatementGSPMcDowell27 min
Aug 15, 9:45 PM EDTSpecial Weather StatementGSPAvery30 min
Aug 16, 2:52 AM EDTAreal Flood AdvisoryGSPBuncombe, Haywood, Henderson, Jackson, Transylvania3 hr
Aug 16, 3:02 AM EDTFlash Flood WarningGSPHaywood, Jackson, Transylvania5 hr
Aug 16, 4:59 AM EDTFlash Flood WarningGSPHenderson, Transylvania3 hr
Aug 16, 7:43 AM EDTFlash Flood Warning Considerable damage threatGSPTransylvania4 hr
Aug 16, 8:51 AM EDTSpecial Weather StatementGSPCatawba39 min
Aug 16, 9:49 AM EDTSpecial Weather StatementGSPCatawba, Lincoln41 min
Aug 16, 10:24 AM EDTFlash Flood WarningGSPCatawba, Lincoln3 hr
Aug 16, 2:20 PM EDTFlash Flood WatchGSPAvery, Buncombe, Burke, Caldwell, Graham, Haywood and 11 more40 hr
Aug 16, 3:46 PM EDTSpecial Weather StatementGSPGaston, Mecklenburg59 min
Aug 16, 4:46 PM EDTSpecial Weather StatementGSPTransylvania59 min
Aug 16, 5:14 PM EDTSpecial Weather StatementGSPDavie, Iredell76 min
Aug 16, 6:53 PM EDTAreal Flood AdvisoryGSPJackson, Transylvania3 hr

Nearby

Flash Flood Warnings in North Carolina, 2021Every flash flood warning 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.