Dense Fog, Green
- When
- November 16, 11:00 PM CST to November 17, 4:00 AM CST
- Where
- Green forecast zone
- Reported by
- AWOS
- Coordinates
- 42.680, -89.602 (the zone’s center; the record gives no point)
Dense Fog in Wisconsin, November 16 to 17, 2012
A large ridge of high pressure over the region brought clear skies and light winds, that when combined with abundant low-level moisture, produced dense fog over most of Southeast Wisconsin and far southern sections of South-Central Wisconsin. Visibilities were reduced to 1/4 mile or less roughly along and southeast of a Monroe, Madison, to Elkhart Lake line from late in the evening of November…
Where it happened
Every event with a place to put it; 13 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
The toll
- Deaths
- 0
- Injuries
- 0
- Property damage
- None recorded
- Crop damage
- None recorded
- Events
- 13
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.
A large ridge of high pressure over the region brought clear skies and light winds, that when combined with abundant low-level moisture, produced dense fog over most of Southeast Wisconsin and far southern sections of South-Central Wisconsin. Visibilities were reduced to 1/4 mile or less roughly along and southeast of a Monroe, Madison, to Elkhart Lake line from late in the evening of November 16th into the early morning hours of November 17th. Several airplane flight departures and arrivals were delayed. Locations to the northwest saw drier air work in overnight that prevented the development of dense fog.
The radar
The national radar mosaic for the moment the first event began.
Event by event
13 dense fog. Local standard time, as filed.
Dense Fog, Rock
- When
- November 16, 11:00 PM CST to November 17, 4:00 AM CST
- Where
- Rock forecast zone
- Reported by
- AWOS
- Coordinates
- 42.671, -89.072 (the zone’s center; the record gives no point)
Dense Fog, Walworth
- When
- November 16, 11:00 PM CST to November 17, 4:00 AM CST
- Where
- Walworth forecast zone
- Reported by
- Law Enforcement
- Coordinates
- 42.669, -88.542 (the zone’s center; the record gives no point)
Dense Fog, Racine
- When
- November 16, 11:00 PM CST to November 17, 4:00 AM 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
- November 16, 11:00 PM CST to November 17, 4:00 AM CST
- Where
- Kenosha forecast zone
- Reported by
- ASOS
- Coordinates
- 42.573, -87.840 (the zone’s center; the record gives no point)
Dense Fog, Sheboygan
- When
- November 17, 3:00 AM CST to 8:00 AM CST
- Where
- Sheboygan forecast zone
- Reported by
- ASOS
- Coordinates
- 43.756, -87.800 (the zone’s center; the record gives no point)
Dense Fog, Dodge
- When
- November 17, 3:00 AM CST to 8:00 AM CST
- Where
- Dodge forecast zone
- Reported by
- AWOS
- Coordinates
- 43.416, -88.707 (the zone’s center; the record gives no point)
Dense Fog, Washington
- When
- November 17, 3:00 AM CST to 8:00 AM CST
- Where
- Washington forecast zone
- Reported by
- AWOS
- Coordinates
- 43.369, -88.231 (the zone’s center; the record gives no point)
Dense Fog, Ozaukee
- When
- November 17, 3:00 AM CST to 8:00 AM CST
- Where
- Ozaukee forecast zone
- Reported by
- Law Enforcement
- Coordinates
- 43.403, -87.891 (the zone’s center; the record gives no point)
Dense Fog, Dane
- When
- November 17, 3:00 AM CST to 8:00 AM CST
- Where
- Dane forecast zone
- Reported by
- ASOS
- Coordinates
- 43.067, -89.418 (the zone’s center; the record gives no point)
Dense Fog, Jefferson
- When
- November 17, 3:00 AM CST to 8:00 AM CST
- Where
- Jefferson forecast zone
- Reported by
- AWOS
- Coordinates
- 43.021, -88.776 (the zone’s center; the record gives no point)
Dense Fog, Waukesha
- When
- November 17, 3:00 AM CST to 8:00 AM CST
- Where
- Waukesha forecast zone
- Reported by
- AWOS
- Coordinates
- 43.018, -88.304 (the zone’s center; the record gives no point)
Dense Fog, Milwaukee
- When
- November 17, 3:00 AM CST to 8:00 AM CST
- Where
- Milwaukee forecast zone
- Reported by
- ASOS
- Coordinates
- 43.022, -87.929 (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 2012Every state in 2012This day in weather historyWarnings in Wisconsin, November 2012
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 2026-09-30. Each event’s entry at NCEI: 421284, 421285, 421286, 421287, 421288, 421289, 421290, 421291, 421292, 421293, 421294, 421295, 421296.