Wisconsin, 2007

Dense Fog in Wisconsin, December 21 to 22, 2007

December 21 to 22, 2007 · NWS MKX · 6 events in 6 counties and zones

Dense fog covered all of south-central and southeast Wisconsin for nearly two days, resulting in numerous cancellations of airline flights and some civic functions. Warm, moist air on southeast winds flowing over melting snow was the factor in the dense fog formation.

Where it happened

Every event with a place to put it; 6 filed by county or forecast zone are drawn at its center, in a lighter ring. Tap one for its entry below.

  • Tornadoes
  • Tropical storms and surge
  • Floods
  • Wind
  • Hail
  • Winter weather
  • Heat and drought
  • Cold
  • Fire, smoke and dust
  • Marine and coastal
  • Other

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The toll

Deaths
0
Injuries
0
Property damage
None recorded
Crop damage
None recorded
Events
6

Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.

What happened

The episode as NWS MKX wrote it up.

Dense fog covered all of south-central and southeast Wisconsin for nearly two days, resulting in numerous cancellations of airline flights and some civic functions. Warm, moist air on southeast winds flowing over melting snow was the factor in the dense fog formation. Visibilities were reduced to 1/10 to 1/4 mile.

What forecasters said that day

The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

Hazardous weather outlook, Dec 21, 6:00 PM CST, 2 hours before
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The radar

The national radar mosaic for the moment the first event began.

Open the radar archive at this moment

Event by event

6 dense fog. Local standard time, as filed.

Dense Fog, Fond du Lac

When
December 21, 8:00 PM CST to December 22, 8:00 PM CST
Where
Fond du Lac forecast zone
Reported by
ASOS
Coordinates
43.754, -88.488 (the zone’s center; the record gives no point)

Dense Fog, Sheboygan

When
December 21, 8:00 PM CST to December 22, 8:00 PM CST
Where
Sheboygan forecast zone
Reported by
ASOS
Coordinates
43.756, -87.800 (the zone’s center; the record gives no point)

Dense Fog, Ozaukee

When
December 21, 8:00 PM CST to December 22, 8:00 PM CST
Where
Ozaukee forecast zone
Reported by
ASOS
Coordinates
43.403, -87.891 (the zone’s center; the record gives no point)

Dense Fog, Milwaukee

When
December 21, 8:00 PM CST to December 22, 8:00 PM CST
Where
Milwaukee forecast zone
Reported by
ASOS
Coordinates
43.022, -87.929 (the zone’s center; the record gives no point)

Dense Fog, Racine

When
December 21, 8:00 PM CST to December 22, 8:00 PM CST
Where
Racine forecast zone
Reported by
ASOS
Coordinates
42.730, -87.812 (the zone’s center; the record gives no point)

Dense Fog, Kenosha

When
December 21, 8:00 PM CST to December 22, 8:00 PM CST
Where
Kenosha forecast zone
Reported by
ASOS
Coordinates
42.573, -87.840 (the zone’s center; the record gives no point)

What these are

Dense Fog
Fog reducing visibility to a quarter mile or less, filed where it caused accidents or disruption.

After NWS Directive 10-1605, the rules offices file Storm Data by.

The same day elsewhere

More

Every storm in Wisconsin in 2007Every state in 2007This day in weather historyWarnings in Wisconsin, December 2007

Sources

NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-10-01. Each event’s entry at NCEI: 70285, 70286, 70287, 70288, 70289, 70290.