Alert archive / Mississippi / Dense Fog Advisories in 2021

Dense Fog Advisory 1, NWS Jackson, MS

February 10, 202112 counties in Mississippi

NWS Jackson, MS issued this dense fog advisory at Feb 10, 2021, 2:09 PM CST for 12 counties in Mississippi. It took effect at Feb 10, 2021, 9:00 PM CST. It was in force for 9 hr.

The area

The counties it named.

The facts

Issued: Feb 10, 2021, 2:09 PM CST (20:09 UTC)
In effect from: Feb 10, 2021, 9:00 PM CST
Expired: Feb 11, 2021, 6:16 AM CST
In force: 9 hr
Issued by: NWS Jackson, MS

Counties Clarke County, MS, Covington County, MS, Forrest County, MS, Jasper County, MS, Jefferson Davis County, MS, Jones County, MS, Lamar County, MS, Lawrence County, MS, Lincoln County, MS, Marion County, MS, Simpson County, MS, Smith County, MS

The radar

The Jackson/Brandon,MS radar (KDGX), 82 km from the middle of the area, began a volume at 20:08 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 12:00Z, 8.2 hours before the alert went out and 154 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 944 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 96 m²/s²
0-3 km storm-relative helicity: 163 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 Jackson, MS wrote its last area forecast discussion before this dense fog advisory went out at Feb 10, 12:37 PM CST, 1 hour 32 minutes earlier.

Area forecast discussion, Feb 10, 12:37 PM CST, 1 hour 32 minutes before

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Hazardous weather outlook, Feb 10, 4:28 AM CST, 9 hours 41 minutes before

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The office that day

Everything else NWS Jackson, MS issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Feb 10, 4:28 AM CST	Winter Weather Advisory	JAN	Bolivar, Sunflower, Washington	32 hr
Feb 10, 4:46 PM CST	Ice Storm Warning	JAN	Bolivar, Sunflower	19 hr

Nearby

Dense Fog Advisories in Mississippi, 2021 Every 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.