Wisconsin, 2000

Dense Fog in Wisconsin, January 9 to 10, 2000

January 9 to 10, 2000 · NWS GRB · 12 events in 12 counties and zones

A warm front moving north through Wisconsin brought warm and moist air to central and east-central Wisconsin. The snow-covered ground cooled the moist air, resulting in widespread dense fog that first developed in the fox valley early in the morning of the 9th and then overspread most of central and east-central Wisconsin by evening.

Where it happened

Every event with a place to put it; 12 filed by county or forecast zone are drawn at its center, in a lighter ring. Tap one for its entry below.

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The toll

Deaths
0
Injuries
0
Property damage
None recorded
Crop damage
None recorded
Events
12

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 GRB wrote it up.

A warm front moving north through Wisconsin brought warm and moist air to central and east-central Wisconsin. The snow-covered ground cooled the moist air, resulting in widespread dense fog that first developed in the fox valley early in the morning of the 9th and then overspread most of central and east-central Wisconsin by evening. The fog began to dissipate a bit shortly after midnight on the 10th.

The radar

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

Open the radar archive at this moment

Event by event

12 dense fog. Local standard time, as filed.

Dense Fog, Brown

When
January 9, 3:00 AM CST to January 10, 2:00 AM CST
Where
Brown forecast zone
Reported by
OFFICIAL NWS OBS.
Coordinates
44.474, -87.993 (the zone’s center; the record gives no point)

Dense Fog, Outagamie

When
January 9, 3:00 AM CST to January 10, 2:00 AM CST
Where
Outagamie forecast zone
Reported by
OFFICIAL NWS OBS.
Coordinates
44.416, -88.465 (the zone’s center; the record gives no point)

Dense Fog, Winnebago

When
January 9, 3:00 AM CST to January 10, 2:00 AM CST
Where
Winnebago forecast zone
Reported by
OFFICIAL NWS OBS.
Coordinates
44.069, -88.645 (the zone’s center; the record gives no point)

Dense Fog, Calumet

When
January 9, 3:00 AM CST to January 10, 2:00 AM CST
Where
Calumet forecast zone
Reported by
UNKNOWN
Coordinates
44.082, -88.218 (the zone’s center; the record gives no point)

Dense Fog, Manitowoc

When
January 9, 3:00 AM CST to January 10, 2:00 AM CST
Where
Manitowoc forecast zone
Reported by
OFFICIAL NWS OBS.
Coordinates
44.091, -87.700 (the zone’s center; the record gives no point)

Dense Fog, Kewaunee

When
January 9, 3:00 AM CST to January 10, 2:00 AM CST
Where
Kewaunee forecast zone
Reported by
UNKNOWN
Coordinates
44.483, -87.514 (the zone’s center; the record gives no point)

Dense Fog, Waupaca

When
January 9, 7:00 AM CST to January 10, 2:00 AM CST
Where
Waupaca forecast zone
Reported by
OFFICIAL NWS OBS.
Coordinates
44.470, -88.965 (the zone’s center; the record gives no point)

Dense Fog, Waushara

When
January 9, 7:00 AM CST to January 10, 2:00 AM CST
Where
Waushara forecast zone
Reported by
UNKNOWN
Coordinates
44.113, -89.243 (the zone’s center; the record gives no point)

Dense Fog, Wood

When
January 9, 7:00 AM CST to January 10, 2:00 AM CST
Where
Wood forecast zone
Reported by
OFFICIAL NWS OBS.
Coordinates
44.455, -90.042 (the zone’s center; the record gives no point)

Dense Fog, Portage

When
January 9, 7:00 AM CST to January 10, 2:00 AM CST
Where
Portage forecast zone
Reported by
OFFICIAL NWS OBS.
Coordinates
44.476, -89.501 (the zone’s center; the record gives no point)

Dense Fog, Marathon

When
January 9, 4:00 PM CST to January 10, 2:00 AM CST
Where
Marathon forecast zone
Reported by
OFFICIAL NWS OBS.
Coordinates
44.898, -89.759 (the zone’s center; the record gives no point)

Dense Fog, Shawano

When
January 9, 4:00 PM CST to January 10, 2:00 AM CST
Where
Shawano forecast zone
Reported by
UNKNOWN
Coordinates
44.789, -88.765 (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 2000Every state in 2000This day in weather historyWarnings in Wisconsin, January 2000

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: 5130631, 5130632, 5130633, 5130634, 5130635, 5130636, 5128938, 5128939, 5130637, 5130638, 5128940, 5128941.