Alert archive / Louisiana / Dense Fog Advisories in 2021

Dense Fog Advisory 7, NWS Lake Charles, LA

January 27, 2021Lafayette Parish, Saint Landry Parish, Saint Martin Parish, Louisiana

NWS Lake Charles, LA issued this dense fog advisory at Jan 27, 2021, 3:28 AM CST for Lafayette Parish, Saint Landry Parish, Saint Martin Parish, Louisiana. It was in force for 3 hr.

The area

The counties it named.

The facts

Issued
Jan 27, 2021, 3:28 AM CST (09:28 UTC)
Expired
Jan 27, 2021, 6:00 AM CST
In force
3 hr
Issued by
NWS Lake Charles, LA

Counties Lafayette Parish, LA, Saint Landry Parish, LA, Saint Martin Parish, LA

The radar

The Lake Charles radar (KLCH), 129 km from the middle of the area, began a volume at 09:32 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

Slidell Radar S, LA (KSIL), launched 00:00Z, 9.5 hours before the alert went out and 211 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 2021-01-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 2021-01-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 325 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
664 m above ground
0-6 km bulk shear
60 kt
0-1 km storm-relative helicity
325 m²/s²
0-3 km storm-relative helicity
351 m²/s²
Significant tornado parameter
0.0
Supercell composite
2.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this dense fog advisory went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Lake Charles, LA wrote its last area forecast discussion before this dense fog advisory went out at Jan 26, 11:54 PM CST, 3 hours 34 minutes earlier.

Area forecast discussion, Jan 26, 11:54 PM CST, 3 hours 34 minutes before
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Hazardous weather outlook, Jan 26, 3:44 PM CST, 11 hours 44 minutes before
Hazardous Weather Outlook
National Weather Service Lake Charles LA
344 PM CST Tue Jan 26 2021

LAZ027>033-041>045-052>055-073-074-TXZ180-201-215-216-259>262-271200-
Vernon-Rapides-Avoyelles-Beauregard-Allen-Evangeline-St. Landry-
Calcasieu-Jefferson Davis-Acadia-Lafayette-Upper St. Martin-
Vermilion-Iberia-St. Mary-Lower St. Martin-West Cameron-East Cameron-
Tyler-Hardin-Jefferson-Orange-Northern Jasper-Northern Newton-
Southern Jasper-Southern Newton-
344 PM CST Tue Jan 26 2021

This Hazardous Weather Outlook is for central Louisiana, south
central Louisiana, southwest Louisiana, west central Louisiana and
southeast Texas.

.DAY ONE...This afternoon and tonight.

Scattered showers and isolated thunderstorms are expected across
South Central Louisiana. No severe thunderstorms are expected at this
time. Patchy fog is expected tonight mainly along and south of the
I-10 corridor.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday.

A stronger cold front is forecast to push through the area early
Wednesday. Brisk and gusty north winds are expected in the wake of
the front Wednesday afternoon, with cooler and drier weather
expected through Friday.

Small rain chances return Saturday into Sunday with the passage of
another front. No severe weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

GMZ455-472-475-271200-
Coastal waters from Lower Atchafalaya River to Intracoastal City LA
out 20 NM-
Waters from Intracoastal City to Cameron LA from 20 to 60 NM-
Waters from Lower Atchafalaya River to Intracoastal City LA from
20 to 60 NM-
344 PM CST Tue Jan 26 2021

...DENSE FOG ADVISORY IN EFFECT UNTIL 6 AM CST WEDNESDAY...

This Hazardous Weather Outlook is for the Gulf of Mexico.

.DAY ONE...This afternoon and tonight.

Please listen to NOAA Weather Radio or go to weather.gov on the
Internet for more information about the following hazards.

   Dense Fog Advisory.

PAreas of dense marine fog will continue today along and south of a
stalled frontal boundary. Scattered showers and isolated
thunderstorms are also possible near the front. No severe
thunderstorms are expected at this time.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday.

A stronger cold front will move through the area late tonight into
Wednesday morning. Strong and gusty north winds are expected
Wednesday and Wednesday night in the wake of this front. Small craft
advisories are likely to be needed over the Gulf waters.

Otherwise, no hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

GMZ430-432-435-450-452-470-271200-
Sabine Lake-Calcasieu Lake-Vermilion Bay-
Coastal waters from Cameron LA to High Island TX out 20 NM-
Coastal waters from Intracoastal City to Cameron LA out 20 NM-
Waters from Cameron LA to High Island TX from 20 to 60 NM-
344 PM CST Tue Jan 26 2021

This Hazardous Weather Outlook is for the Gulf of Mexico and the
coastal lakes and bays of the Gulf of Mexico.

.DAY ONE...This afternoon and tonight.

Scattered showers and isolated thunderstorms are possible near a
stalled frontal boundary. No severe thunderstorms are expected.
Patchy fog is also possible across the Gulf waters today, especially
near and to the south of the front.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday.

A stronger cold front will move through the area late tonight into
Wednesday morning. Strong and gusty north winds are expected
Wednesday and Wednesday night in the wake of this front. Small craft
advisories are likely to be needed over the Gulf waters.

Otherwise, no hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

The office that day

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

IssuedProductOfficeCountiesLasted
Jan 26, 8:34 PM CSTSmall Craft AdvisoryLCH36 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.