Alert archive / South Carolina / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 166, NWS Columbia, SC

September 17, 2018Clarendon County, Lee County, Sumter County, South Carolina

NWS Columbia, SC issued this severe thunderstorm warning at Sep 17, 2018, 6:13 PM EDT for Clarendon County, Lee County, Sumter County, South Carolina. It was in force for 62 min. 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, 6:13 PM EDT (22:13 UTC)
Expired
Sep 17, 2018, 7:15 PM EDT
In force
62 min
Issued by
NWS Columbia, SC
Area
Storm-based polygon
Hail
0.75 in
Wind
70.0 mph

Counties Clarendon County, SC, Lee County, SC, Sumter County, SC

The radar

The Columbia radar (KCAE), 77 km from the middle of the area, began a volume at 22:14 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

Greensboro/Hi Pt, NC (KGSO), launched 12:00Z, 10.2 hours before the alert went out and 243 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, Greensboro/Hi Pt, NC at 12:00Z on 2018-09-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 122 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, Greensboro/Hi Pt, NC at 12:00Z on 2018-09-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 88 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
122 J/kg
Mixed-layer CIN
-9 J/kg
Mixed-layer LCL
615 m above ground
0-6 km bulk shear
22 kt
0-1 km storm-relative helicity
88 m²/s²
0-3 km storm-relative helicity
107 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.4

Open this sounding in Storm Lab

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 17, 1:32 AM EDTAreal Flood WarningCAEChesterfield, Kershaw, Lancaster, Lee9 hr
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, 6:29 PM EDTSpecial Weather StatementCAEOrangeburg46 min
Sep 17, 6:52 PM EDTSpecial Weather StatementCAEClarendon53 min
Sep 17, 7:43 PM EDTSpecial Weather StatementCAEClarendon62 min

Nearby

Severe Thunderstorm Warnings in South Carolina, 2018Every severe thunderstorm 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.