Alert archive / Wisconsin / Dense Fog Advisories in 2021

Dense Fog Advisory 10, NWS Green Bay, WI

December 15, 202122 counties in Wisconsin

NWS Green Bay, WI issued this dense fog advisory at Dec 15, 2021, 3:52 AM CST for 22 counties in Wisconsin. It was in force for 20 hr.

The area

The counties it named.

The facts

Issued: Dec 15, 2021, 3:52 AM CST (09:52 UTC)
Expired: Dec 16, 2021, 12:00 AM CST
In force: 20 hr
Issued by: NWS Green Bay, WI

All 22 counties

Brown County, WI, Calumet County, WI, Door County, WI, Florence County, WI, Forest County, WI, Kewaunee County, WI, Langlade County, WI, Lincoln County, WI, Manitowoc County, WI, Marathon County, WI, Marinette County, WI, Menominee County, WI, Oconto County, WI, Oneida County, WI, Outagamie County, WI, Portage County, WI, Shawano County, WI, Vilas County, WI, Waupaca County, WI, Waushara County, WI, Winnebago County, WI, Wood County, WI

The radar

The Green Bay radar (KGRB), 63 km from the middle of the area, began a volume at 09:49 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

Green Bay/Straub, WI (KGRB), launched 00:00Z, 9.9 hours before the alert went out and 65 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: 984 m above ground
0-6 km bulk shear: 53 kt
0-1 km storm-relative helicity: 317 m²/s²
0-3 km storm-relative helicity: 392 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 Green Bay, WI wrote its last area forecast discussion before this dense fog advisory went out at Dec 14, 10:42 PM CST, 5 hours 10 minutes earlier.

Area forecast discussion, Dec 14, 10:42 PM CST, 5 hours 10 minutes before

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Hazardous weather outlook, Dec 14, 2:51 PM CST, 13 hours 1 minute before

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<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
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        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
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The office that day

Everything else NWS Green Bay, WI issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Dec 14, 8:48 PM CST	Storm Watch	GRB		7 hr
Dec 15, 3:52 AM CST	High Wind Warning	GRB	Brown, Calumet, Door, Florence, Forest, Kewaunee and 16 more	28 hr
Dec 15, 4:08 AM CST	Storm Warning	GRB		32 hr
Dec 15, 6:44 AM CST	Marine Dense Fog Advisory	GRB		17 hr

Nearby

Dense Fog Advisories in Wisconsin, 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.