Alert archive / Louisiana / Dense Fog Advisories in 2015

Dense Fog Advisory 21, NWS New Orleans, LA

December 25, 20154 parishes in Louisiana; Pearl River County, Mississippi

NWS New Orleans, LA issued this dense fog advisory at Dec 25, 2015, 10:45 PM CST for 4 parishes in Louisiana; Pearl River County, Mississippi. It was in force for 10 hr.

The area

The counties it named.

The facts

Issued
Dec 25, 2015, 10:45 PM CST (04:45 UTC)
Expired
Dec 26, 2015, 9:00 AM CST
In force
10 hr
Issued by
NWS New Orleans, LA

Counties Assumption Parish, LA, Saint Bernard Parish, LA, Saint James Parish, LA, Saint John the Baptist Parish, LA, Pearl River County, MS

The nearest sounding before it

Jackson, MS (KJAN), launched 00:00Z, 4.8 hours before the alert went out and 244 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, Jackson, MS at 00:00Z on 2015-12-26Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 51 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, Jackson, MS at 00:00Z on 2015-12-26The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 172 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
51 J/kg
Mixed-layer CIN
-364 J/kg
Mixed-layer LCL
1343 m above ground
0-6 km bulk shear
39 kt
0-1 km storm-relative helicity
172 m²/s²
0-3 km storm-relative helicity
193 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The office that day

Everything else NWS New Orleans, LA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Dec 25, 9:17 PM CSTRiver Flood WarningLIXSaint Tammany11 days
Dec 26, 3:11 PM CSTMarine Dense Fog AdvisoryLIX12 hr

Nearby

Dense Fog Advisories in Louisiana, 2015Dense Fog Advisories in Mississippi, 2015Every dense fog advisory in 2015

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.