Alert archive / South Carolina / Flash Flood Warnings in 2020

Flash Flood Warning 6, NWS Columbia, SC

May 30, 20204 counties in South Carolina

NWS Columbia, SC issued this flash flood warning at May 30, 2020, 12:29 AM EDT for 4 counties in South 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
May 30, 2020, 12:29 AM EDT (04:29 UTC)
Expired
May 30, 2020, 3:00 AM EDT
In force
3 hr
Issued by
NWS Columbia, SC
Area
Storm-based polygon
Flood severity
None

Counties Calhoun County, SC, Clarendon County, SC, Richland County, SC, Sumter County, SC

The radar

The Columbia radar (KCAE), 53 km from the middle of the area, began a volume at 04:29 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

Newport, NC (KMHX), launched 00:00Z, 4.5 hours before the alert went out and 355 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, Newport, NC at 00:00Z on 2020-05-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 105 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, Newport, NC at 00:00Z on 2020-05-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -16 square meters per square second.193958Sfc1 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
105 J/kg
Mixed-layer CIN
-56 J/kg
Mixed-layer LCL
796 m above ground
0-6 km bulk shear
31 kt
0-1 km storm-relative helicity
-16 m²/s²
0-3 km storm-relative helicity
6 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.1

Open this sounding in Storm Lab

The office that day

Everything else NWS Columbia, SC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 29, 8:13 PM EDTSpecial Weather StatementCAEKershaw, Lexington, Richland62 min
May 29, 8:35 PM EDTAreal Flood AdvisoryCAELexington, Richland115 min
May 29, 8:44 PM EDTAreal Flood AdvisoryCAEClarendon2 hr
May 29, 8:59 PM EDTSpecial Weather StatementCAERichland61 min
May 29, 9:11 PM EDTSevere Thunderstorm WarningCAECalhoun, Lexington, Richland, Sumter49 min
May 29, 9:49 PM EDTAreal Flood AdvisoryCAECalhoun, Clarendon, Kershaw, Lee, Lexington, Orangeburg and 2 more116 min
May 29, 10:12 PM EDTFlash Flood WarningCAELexington, Richland2 hr
May 29, 10:34 PM EDTFlash Flood WarningCAECalhoun, Clarendon, Richland, Sumter116 min
May 30, 6:06 AM EDTRiver Flood AdvisoryCAELexington, Richland8 hr

Nearby

Flash Flood Warnings in South Carolina, 2020Every flash flood warning 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.