Alert archive / South Carolina / Areal Flood Warnings in 2018

Areal Flood Warning 2, NWS Columbia, SC

September 17, 20184 counties in South Carolina

NWS Columbia, SC issued this areal flood warning at Sep 17, 2018, 1:32 AM EDT for 4 counties in South Carolina. It was in force for 9 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
Sep 17, 2018, 1:32 AM EDT (05:32 UTC)
Expired
Sep 17, 2018, 10:30 AM EDT
In force
9 hr
Issued by
NWS Columbia, SC
Area
Storm-based polygon
Flood severity
None

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

The radar

The Columbia radar (KCAE), 85 km from the middle of the area, began a volume at 05:32 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 00:00Z, 5.5 hours before the alert went out and 178 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 00:00Z on 2018-09-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1822 joules per kilogram.LCLEL10008507005003002001001 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 00:00Z on 2018-09-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 64 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
1822 J/kg
Mixed-layer CIN
-4 J/kg
Mixed-layer LCL
785 m above ground
0-6 km bulk shear
30 kt
0-1 km storm-relative helicity
64 m²/s²
0-3 km storm-relative helicity
55 m²/s²
Significant tornado parameter
0.0
Supercell composite
2.8

Open this sounding in Storm Lab

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 17, 2:37 AM EDTSpecial Weather StatementCAEKershaw, Richland38 min
Sep 17, 3:09 AM EDTSpecial Weather StatementCAEChesterfield, Kershaw51 min
Sep 17, 10:50 AM EDTRiver Flood WarningCAEFairfield, Kershaw, Lancaster49 hr
Sep 17, 3:45 PM EDTSpecial Weather StatementCAELexington30 min
Sep 17, 4:30 PM EDTSpecial Weather StatementCAECalhoun30 min
Sep 17, 5:37 PM EDTSpecial Weather StatementCAEClarendon23 min
Sep 17, 5:41 PM EDTSpecial Weather StatementCAESumter34 min
Sep 17, 6:13 PM EDTSevere Thunderstorm WarningCAEClarendon, Lee, Sumter62 min
Sep 17, 6:29 PM EDTSpecial Weather StatementCAEOrangeburg46 min
Sep 17, 6:52 PM EDTSpecial Weather StatementCAEClarendon53 min
Sep 17, 7:43 PM EDTSpecial Weather StatementCAEClarendon62 min

Nearby

Areal Flood Warnings in South Carolina, 2018Every areal flood warning in 2018

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.