Alert archive / Virginia / Dense Fog Advisories in 2021

Dense Fog Advisory 2, NWS Wakefield, VA

February 28, 202145 counties in Virginia

NWS Wakefield, VA issued this dense fog advisory at Feb 28, 2021, 8:46 PM EST for 45 counties in Virginia. It was in force for 9 hr.

The area

The counties it named.

The facts

Issued: Feb 28, 2021, 8:46 PM EST (01:46 UTC)
Expired: Mar 1, 2021, 5:24 AM EST
In force: 9 hr
Issued by: NWS Wakefield, VA

All 45 counties

Amelia County, VA, Brunswick County, VA, Caroline County, VA, Charles City County, VA, Chesterfield County, VA, City of Colonial Heights, VA, City of Emporia, VA, City of Franklin, VA, City of Hampton, VA, City of Hopewell, VA, City of Newport News, VA, City of Petersburg, VA, City of Poquoson, VA, City of Richmond, VA, City of Williamsburg, VA, Cumberland County, VA, Dinwiddie County, VA, Essex County, VA, Fluvanna County, VA, Gloucester County, VA, Goochland County, VA, Greensville County, VA, Hanover County, VA, Henrico County, VA, James City County, VA, King and Queen County, VA, King William County, VA, Lancaster County, VA, Louisa County, VA, Lunenburg County, VA, Mathews County, VA, Mecklenburg County, VA, Middlesex County, VA, New Kent County, VA, Northumberland County, VA, Nottoway County, VA, Powhatan County, VA, Prince Edward County, VA, Prince George County, VA, Richmond County, VA, Southampton County, VA, Surry County, VA, Sussex County, VA, Westmoreland County, VA, York County, VA

The radar

The Norfolk radar (KAKQ), 47 km from the middle of the area, began a volume at 01:46 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

Roanoke, VA (KRNK), launched 00:00Z, 1.8 hours before the alert went out and 199 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: 966 m above ground
0-6 km bulk shear: 71 kt
0-1 km storm-relative helicity: 237 m²/s²
0-3 km storm-relative helicity: 393 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 Wakefield, VA wrote its last area forecast discussion before this dense fog advisory went out at Feb 28, 7:15 PM EST, 1 hour 31 minutes earlier.

Area forecast discussion, Feb 28, 7:15 PM EST, 1 hour 31 minutes before

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Hazardous weather outlook, Feb 28, 4:07 PM EST, 4 hours 39 minutes before

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In the hours before

Special weather statement, Feb 28, 5:58 PM EST, 2 hours 48 minutes before

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The office that day

Everything else NWS Wakefield, VA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Feb 28, 7:10 PM EST	Marine Dense Fog Advisory	AKQ		12 hr
Mar 1, 2:54 AM EST	Gale Warning	AKQ		28 hr
Mar 1, 9:14 AM EST	River Flood Warning	AKQ	Chesterfield, Henrico, City of Richmond	61 hr
Mar 1, 10:15 AM EST	Special Marine Warning	AKQ		60 min
Mar 1, 1:36 PM EST	Special Marine Warning	AKQ		54 min
Mar 1, 2:04 PM EST	Special Weather Statement	AKQ	Chesterfield, Henrico, City of Richmond	41 min
Mar 1, 2:18 PM EST	Special Marine Warning	AKQ		87 min
Mar 1, 2:45 PM EST	Special Weather Statement	AKQ	Dinwiddie, Prince George, City of Colonial Heights, City of Hopewell, City of Petersburg	45 min
Mar 1, 10:15 AM EST	Special Weather Statement	AKQ	Currituck	30 min
Mar 1, 1:29 PM EST	Special Weather Statement	AKQ	Worcester	46 min

Nearby

Dense Fog Advisories in Virginia, 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.