Alert archive / Wisconsin / Dense Fog Advisories in 2021

Dense Fog Advisory 5, NWS Green Bay, WI

August 10, 20219 counties in Wisconsin

NWS Green Bay, WI issued this dense fog advisory at Aug 10, 2021, 1:36 AM CDT for 9 counties in Wisconsin. It was in force for 6 hr.

The area

The counties it named.

The facts

Issued: Aug 10, 2021, 1:36 AM CDT (06:36 UTC)
Expired: Aug 10, 2021, 8:00 AM CDT
In force: 6 hr
Issued by: NWS Green Bay, WI

Counties Florence County, WI, Forest County, WI, Langlade County, WI, Lincoln County, WI, Marinette County, WI, Menominee County, WI, Oconto County, WI, Oneida County, WI, Vilas County, WI

The radar

The Green Bay radar (KGRB), 124 km from the middle of the area, began a volume at 06:38 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

Davenport, (KDVN), launched 00:00Z, 6.6 hours before the alert went out and 447 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: 2409 J/kg
Mixed-layer CIN: -17 J/kg
Mixed-layer LCL: 1156 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: 49 m²/s²
0-3 km storm-relative helicity: 165 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 Aug 9, 10:43 PM CDT, 2 hours 53 minutes earlier.

Area forecast discussion, Aug 9, 10:43 PM CDT, 2 hours 53 minutes before

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Hazardous weather outlook, Aug 9, 2:58 PM CDT, 10 hours 38 minutes before

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  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</head>
<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.
      </p>
      <p class="small" id="detail">
        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
Aug 9, 7:08 PM CDT	Marine Dense Fog Advisory	GRB		13 hr
Aug 10, 12:18 PM CDT	Special Weather Statement	GRB	Vilas	42 min
Aug 10, 12:48 PM CDT	Special Weather Statement	GRB	Vilas	42 min
Aug 10, 1:07 PM CDT	Special Weather Statement	GRB	Vilas	38 min
Aug 10, 5:16 PM CDT	Special Weather Statement	GRB	Outagamie	29 min
Aug 10, 5:46 PM CDT	Special Weather Statement	GRB	Outagamie	44 min
Aug 10, 5:46 PM CDT	Special Weather Statement	GRB	Outagamie	44 min
Aug 10, 6:00 PM CDT	Tornado Warning	GRB	Outagamie, Shawano	30 min
Aug 10, 6:29 PM CDT	Severe Thunderstorm Warning	GRB	Brown, Outagamie	46 min
Aug 10, 6:32 PM CDT	Special Marine Warning	GRB		43 min
Aug 10, 6:41 PM CDT	Severe Thunderstorm Warning	GRB	Marinette, Oconto	49 min
Aug 10, 6:52 PM CDT	Areal Flood Advisory	GRB	Brown, Kewaunee, Outagamie	3 hr
Aug 10, 6:59 PM CDT	Severe Thunderstorm Warning Considerable damage threat	GRB	Brown, Door, Kewaunee	46 min

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.