Alert archive / North Carolina / Flash Flood Watches in 2020

Flash Flood Watch 4, NWS Greenville-Spartanburg, SC

March 24, 2020Graham County, Macon County, Swain County, North Carolina; Habersham County, Rabun County, Georgia

NWS Greenville-Spartanburg, SC issued this flash flood watch at Mar 24, 2020, 4:24 AM EDT for Graham County, Macon County, Swain County, North Carolina; Habersham County, Rabun County, Georgia. It took effect at Mar 24, 2020, 2:00 PM EDT. It was in force for 16 hr.

The area

The counties it named.

The facts

Issued
Mar 24, 2020, 4:24 AM EDT (08:24 UTC)
In effect from
Mar 24, 2020, 2:00 PM EDT
Expired
Mar 25, 2020, 6:23 AM EDT
In force
16 hr
Issued by
NWS Greenville-Spartanburg, SC
Flood severity
None

Counties Habersham County, GA, Rabun County, GA, Graham County, NC, Macon County, NC, Swain County, NC

The radar

The Knoxville radar (KMRX), 119 km from the middle of the area, began a volume at 08:26 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, 8.4 hours before the alert went out and 212 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 2020-03-24Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 180 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 2020-03-24The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 280 square meters per square second.1939587897Sfc1 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
180 J/kg
Mixed-layer CIN
-67 J/kg
Mixed-layer LCL
697 m above ground
0-6 km bulk shear
57 kt
0-1 km storm-relative helicity
280 m²/s²
0-3 km storm-relative helicity
335 m²/s²
Significant tornado parameter
0.2
Supercell composite
1.8

Open this sounding in Storm Lab

The office that day

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

IssuedProductOfficeCountiesLasted
Mar 24, 8:28 AM EDTDense Fog AdvisoryGSPAlexander, Burke, Caldwell, Catawba, Cleveland, Gaston and 5 more92 min
Mar 24, 7:52 PM EDTSpecial Weather StatementGSPSwain23 min
Mar 24, 10:20 AM EDTSpecial Weather StatementGSPGreenwood25 min
Mar 24, 10:37 AM EDTSpecial Weather StatementGSPGreenwood53 min
Mar 24, 10:42 AM EDTSevere Thunderstorm WarningGSPGreenwood14 min
Mar 24, 12:04 PM EDTSpecial Weather StatementGSPOconee26 min
Mar 24, 12:42 PM EDTSpecial Weather StatementGSPGreenwood48 min
Mar 24, 1:03 PM EDTSpecial Weather StatementGSPGreenwood42 min
Mar 24, 1:49 PM EDTSpecial Weather StatementGSPAbbeville26 min
Mar 24, 2:05 PM EDTSpecial Weather StatementGSPGreenwood25 min

Nearby

Flash Flood Watches in North Carolina, 2020Flash Flood Watches in Georgia, 2020Every flash flood watch 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.