Alert archive / North Carolina / Flash Flood Warnings in 2022

Flash Flood Warning 17, NWS Greenville-Spartanburg, SC

July 21, 2022Swain County, North Carolina

NWS Greenville-Spartanburg, SC issued this flash flood warning at Jul 21, 2022, 2:22 AM EDT for Swain 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 counties it named.

The facts

Issued
Jul 21, 2022, 2:22 AM EDT (06:22 UTC)
Expired
Jul 21, 2022, 5:13 AM EDT
In force
3 hr
Issued by
NWS Greenville-Spartanburg, SC
Area
Storm-based polygon
Flood severity
None

County Swain County, NC

The radar

The Knoxville radar (KMRX), 76 km from the middle of the area, began a volume at 06:22 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, 6.4 hours before the alert went out and 253 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 2022-07-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1912 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°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 2022-07-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -2 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
1912 J/kg
Mixed-layer CIN
-8 J/kg
Mixed-layer LCL
1424 m above ground
0-6 km bulk shear
23 kt
0-1 km storm-relative helicity
-2 m²/s²
0-3 km storm-relative helicity
110 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.0

Open this sounding in Storm Lab

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 20, 8:13 PM EDTSpecial Weather StatementGSPUnion32 min
Jul 20, 8:33 PM EDTSpecial Weather StatementGSPUnion27 min
Jul 20, 9:19 PM EDTAreal Flood AdvisoryGSPMecklenburg, Union31 min
Jul 20, 11:59 PM EDTSpecial Weather StatementGSPSwain31 min
Jul 21, 12:31 AM EDTSpecial Weather StatementGSPSwain29 min
Jul 21, 1:00 AM EDTSpecial Weather StatementGSPSwain45 min
Jul 21, 1:07 AM EDTAreal Flood AdvisoryGSPSwain3 hr
Jul 20, 8:03 PM EDTSpecial Weather StatementGSPPickens27 min
Jul 20, 8:10 PM EDTSpecial Weather StatementGSPOconee35 min
Jul 20, 8:40 PM EDTSpecial Weather StatementGSPOconee35 min
Jul 20, 9:21 PM EDTSpecial Weather StatementGSPOconee24 min
Jul 21, 8:42 AM EDTSpecial Weather StatementGSPGreenwood33 min
Jul 21, 9:27 AM EDTSpecial Weather StatementGSPGreenwood48 min
Jul 20, 8:43 PM EDTSpecial Weather StatementGSPRabun47 min
Jul 20, 10:01 PM EDTSpecial Weather StatementGSPStephens29 min

Nearby

Flash Flood Warnings in North Carolina, 2022Every flash flood warning in 2022

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.