Alert archive / Louisiana / Dense Fog Advisories in 2021

Dense Fog Advisory 6, NWS Lake Charles, LA

January 25, 2021Cameron Parish, Louisiana

NWS Lake Charles, LA issued this dense fog advisory at Jan 25, 2021, 6:13 PM CST for Cameron Parish, Louisiana. It was in force for 6 hr.

The area

The counties it named.

The facts

Issued
Jan 25, 2021, 6:13 PM CST (00:13 UTC)
Expired
Jan 26, 2021, 12:00 AM CST
In force
6 hr
Issued by
NWS Lake Charles, LA

County Cameron Parish, LA

The radar

The Lake Charles radar (KLCH), 31 km from the middle of the area, began a volume at 00:18 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

Slidell Radar S, LA (KSIL), launched 00:00Z, 0.2 hours before the alert went out and 340 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, Slidell Radar S, LA at 00:00Z on 2021-01-26Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 703 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, Slidell Radar S, LA at 00:00Z on 2021-01-26The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 221 square meters per square second.1939587897Sfc1 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
703 J/kg
Mixed-layer CIN
-81 J/kg
Mixed-layer LCL
669 m above ground
0-6 km bulk shear
48 kt
0-1 km storm-relative helicity
221 m²/s²
0-3 km storm-relative helicity
213 m²/s²
Significant tornado parameter
0.7
Supercell composite
2.4

Open this sounding in Storm Lab

The office that day

Everything else NWS Lake Charles, LA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jan 25, 6:07 PM CSTMarine Dense Fog AdvisoryLCH36 hr
Jan 26, 3:59 AM CSTMarine Dense Fog AdvisoryLCH26 hr

Nearby

Dense Fog Advisories in Louisiana, 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.