Alert archive / South Carolina / Dense Fog Advisories in 2021

Dense Fog Advisory 6, NWS Wilmington, NC

February 11, 2021Georgetown County, Williamsburg County, South Carolina

NWS Wilmington, NC issued this dense fog advisory at Feb 11, 2021, 10:35 PM EST for Georgetown County, Williamsburg County, South Carolina. It was in force for 4 hr.

The area

The counties it named.

The facts

Issued
Feb 11, 2021, 10:35 PM EST (03:35 UTC)
Expired
Feb 12, 2021, 3:02 AM EST
In force
4 hr
Issued by
NWS Wilmington, NC

Counties Georgetown County, SC, Williamsburg County, SC

The radar

The Wilmington radar (KLTX), 113 km from the middle of the area, began a volume at 03:36 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, 3.6 hours before the alert went out and 82 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 2021-02-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 53 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 00:00Z on 2021-02-12The 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
53 J/kg
Mixed-layer CIN
-69 J/kg
Mixed-layer LCL
596 m above ground
0-6 km bulk shear
44 kt
0-1 km storm-relative helicity
88 m²/s²
0-3 km storm-relative helicity
148 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.5

Open this sounding in Storm Lab

The office that day

Everything else NWS Wilmington, NC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Feb 11, 10:36 PM ESTMarine Dense Fog AdvisoryILM7 hr
Feb 12, 2:59 AM ESTCoastal Flood AdvisoryILMNew Hanover9 hr
Feb 12, 6:01 AM ESTSmall Craft AdvisoryILM19 hr
Feb 12, 3:24 PM ESTAreal Flood AdvisoryILMBrunswick, New Hanover3 hr

Nearby

Dense Fog Advisories in South Carolina, 2021Every dense fog advisory in 2021

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.