Alert archive / South Carolina / Flash Flood Watches in 2020

Flash Flood Watch 6, NWS Columbia, SC

May 29, 20205 counties in South Carolina

NWS Columbia, SC issued this flash flood watch at May 29, 2020, 8:04 AM EDT for 5 counties in South Carolina. It was in force for 16 hr.

The area

The counties it named.

The facts

Issued
May 29, 2020, 8:04 AM EDT (12:04 UTC)
Expired
May 30, 2020, 12:00 AM EDT
In force
16 hr
Issued by
NWS Columbia, SC
Flood severity
None

Counties Chesterfield County, SC, Kershaw County, SC, Lancaster County, SC, Lee County, SC, Sumter County, SC

The radar

The Columbia radar (KCAE), 78 km from the middle of the area, began a volume at 12:07 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

Charleston AFB, SC (KCHS), launched 12:00Z, 0.1 hours before the alert went out and 166 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, Charleston AFB, SC at 12:00Z on 2020-05-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 157 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, Charleston AFB, SC at 12:00Z on 2020-05-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 0 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
157 J/kg
Mixed-layer CIN
-86 J/kg
Mixed-layer LCL
1070 m above ground
0-6 km bulk shear
0 kt
0-1 km storm-relative helicity
0 m²/s²
0-3 km storm-relative helicity
0 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The office that day

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

IssuedProductOfficeCountiesLasted
May 28, 8:01 PM EDTSevere Thunderstorm WarningCAEChesterfield44 min
May 28, 8:36 PM EDTFlash Flood WarningCAEChesterfield3 hr
May 28, 8:59 PM EDTFlash Flood WarningCAEChesterfield, Kershaw, Lancaster3 hr
May 29, 7:42 AM EDTSpecial Weather StatementCAEKershaw33 min
May 29, 9:15 AM EDTRiver Flood WarningCAECalhoun, Lexington, Richland61 hr
May 29, 11:03 AM EDTAreal Flood AdvisoryCAECalhoun, Lexington, Richland3 hr
May 29, 11:42 AM EDTSpecial Weather StatementCAECalhoun, Kershaw, Richland, Sumter48 min
May 29, 11:54 AM EDTSevere Thunderstorm WarningCAELancaster36 min
May 29, 12:31 PM EDTAreal Flood AdvisoryCAELancaster3 hr
May 29, 12:40 PM EDTSpecial Weather StatementCAELee, Sumter35 min
May 29, 12:54 PM EDTSevere Thunderstorm WarningCAELee36 min
May 29, 5:14 PM EDTAreal Flood AdvisoryCAELee, Sumter2 hr
May 29, 5:43 PM EDTAreal Flood AdvisoryCAEClarendon2 hr
May 29, 6:12 PM EDTSpecial Weather StatementCAESaluda48 min
May 29, 6:27 PM EDTAreal Flood AdvisoryCAEClarendon, Lee, Sumter2 hr
May 29, 7:03 PM EDTSpecial Weather StatementCAESaluda42 min
May 29, 7:08 PM EDTSevere Thunderstorm WarningCAELexington, Newberry, Saluda37 min
May 29, 7:45 PM EDTSevere Thunderstorm WarningCAELexington, Newberry, Richland31 min

Nearby

Flash Flood Watches in South Carolina, 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.