Deepening low pressure over the Plains moving northeast towards Minnesota brought a push of warm air over a deep snow pack across southern Wisconsin. The increasing moisture injected into the boundary layer from melting snow produced widespread dense fog over South Central and Southeast Wisconsin from the evening of December 30th into the afternoon of December 31st.
Every event with a place to put it; 20 filed by county or forecast zone are drawn at its center, in a lighter ring. Tap one for its entry below.
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.
The episode as NWS MKX wrote it up.
Deepening low pressure over the Plains moving northeast towards Minnesota brought a push of warm air over a deep snow pack across southern Wisconsin. The increasing moisture injected into the boundary layer from melting snow produced widespread dense fog over South Central and Southeast Wisconsin from the evening of December 30th into the afternoon of December 31st. Visibilities of 1/4 mile or less developed over southwest sections of Wisconsin the evening of December 29th, dissipated in spots for a time during the day on the 30th, then re-developed and spread to the northeast during the night of December 30th.
The national radar mosaic for the moment the first event began.
20 dense fog. Local standard time, as filed.
Widespread dense fog covered the county for a good portion of the time from the evening of December 29th to the evening of December 31st. Visibilities of 1/4 mile or less produced difficult driving conditions.
Widespread dense fog covered the county for a good portion of the time from the evening of December 29th to the evening of December 31st. Visibilities of 1/4 mile or less produced difficult driving conditions.
Widespread dense fog covered the county for a good portion of the time from the evening of December 29th to the evening of December 31st. Visibilities of 1/4 mile or less produced difficult driving conditions.
Widespread dense fog covered the county for a good portion of the time from the morning of December 30th to the evening of December 31st. Visibilities of 1/4 mile or less produced difficult driving conditions.
Widespread dense fog covered the county for a good portion of the time from the morning of December 30th to the evening of December 31st. Visibilities of 1/4 mile or less produced difficult driving conditions.
Widespread dense fog covered the county for a good portion of the time from the morning of December 30th to the evening of December 31st. Visibilities of 1/4 mile or less produced difficult driving conditions.
Widespread dense fog covered the county for a good portion of the time from the morning of December 30th into the evening of December 31st. Visibilities of 1/4 mile or less produced difficult driving conditions.
Widespread dense fog covered the county for a good portion of the time from the morning of December 30th into the evening of December 31st. Visibilities of 1/4 mile or less produced difficult driving conditions.
Widespread dense fog covered the county for a good portion of the time from the morning of December 30th to the evening of December 31st. Visibilities of 1/4 mile or less produced difficult driving conditions.
Widespread dense fog covered the county for a good portion of the time from the morning of the 30th into the evening of the 31st. Visibilities of 1/4 mile or less produced difficult driving conditions.
Widespread dense fog covered the county for a good portion of the time from the morning of December 30th to the evening of December 31st. Visibilities of 1/4 mile or less produced difficult driving conditions.
Widespread dense fog covered the county for a good portion of the time from the morning of December 30th to the evening of December 31st. Visibilities of 1/4 mile or less produced difficult driving conditions. A tanker truck rolled over after leaving a plant in the Town of Aztalan when the driver lost sight of the road and drove into a ditch.
Widespread dense fog covered the county for a good portion of the time from the morning of the 30th through the evening of the 31st. Visibilities of 1/4 mile or less produced difficult driving conditions.
Widespread dense fog covered the county for a good portion of the time from the morning of the 30th into the evening of the 31st. Visibilities of 1/4 mile or less produced difficult driving conditions.
Widespread dense fog covered the county with visibilities of 1/4 mile or less producing difficult driving conditions.
Widespread dense fog covered the county for a good portion of the time from the morning of December 30th to the evening of December 31st. Visibilities of 1/4 mile or less produced difficult driving conditions.
Widespread dense fog covered the county for a good portion of the time from the morning of the 30th into the evening of the 31st. Visibilities of 1/4 mile or less produced difficult driving conditions.
Widespread dense fog covered the county for a good portion of the time from the morning of December 30th to the evening of December 31st. Visibilities of 1/4 mile or less produced difficult driving conditions.
Widespread dense fog covered the county for a good portion of the time from the morning of December 30th to the evening of December 31st. Visibilities of 1/4 mile or less produced difficult driving conditions.
Widespread dense fog covered the county for a good portion of the time from the morning of December 30th to the evening of December 31st. Visibilities of 1/4 mile or less produced difficult driving conditions.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Wisconsin in 2010Every state in 2010This day in weather historyWarnings in Wisconsin, December 2010
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: 275587, 275588, 275589, 275590, 275591, 275593, 275594, 275596, 275597, 275598, 275600, 275602, 275605, 275606, 275607, 275611, 275612, 275613, 275757, 275758.