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.

Dense Fog in WALWORTH, WISCONSIN
From 30-DEC-10 07:00:00 to 31-DEC-10 18:00:00 (CST-6)
Reported by: Law Enforcement

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.

Dense Fog in WASHINGTON, WISCONSIN
From 30-DEC-10 07:00:00 to 31-DEC-10 18:00:00 (CST-6)
Reported by: AWOS

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.

Dense Fog in GREEN LAKE, WISCONSIN
From 30-DEC-10 07:00:00 to 31-DEC-10 18:00:00 (CST-6)
Reported by: Law Enforcement

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.

Dense Fog in COLUMBIA, WISCONSIN
From 30-DEC-10 07:00:00 to 31-DEC-10 18:00:00 (CST-6)
Reported by: Law Enforcement

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.

Dense Fog in JEFFERSON, WISCONSIN
From 30-DEC-10 07:00:00 to 31-DEC-10 18:00:00 (CST-6)
Property damage: 10.00K
Reported by: Law Enforcement

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.

Dense Fog in RACINE, WISCONSIN
From 30-DEC-10 07:00:00 to 31-DEC-10 18:00:00 (CST-6)
Reported by: ASOS

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.

Dense Fog in KENOSHA, WISCONSIN
From 30-DEC-10 07:00:00 to 31-DEC-10 18:00:00 (CST-6)
Reported by: ASOS

Widespread dense fog covered the county with visibilities of 1/4 mile or less producing difficult driving conditions.

Dense Fog in WAUKESHA, WISCONSIN
From 30-DEC-10 07:00:00 to 31-DEC-10 18:00:00 (CST-6)
Reported by: AWOS

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.

Dense Fog in DODGE, WISCONSIN
From 30-DEC-10 07:00:00 to 31-DEC-10 18:00:00 (CST-6)
Reported by: AWOS

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.

Dense Fog in SHEBOYGAN, WISCONSIN
From 30-DEC-10 07:00:00 to 31-DEC-10 18:00:00 (CST-6)
Reported by: ASOS

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.

Dense Fog in OZAUKEE, WISCONSIN
From 30-DEC-10 07:00:00 to 31-DEC-10 18:00:00 (CST-6)
Reported by: Law Enforcement

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.

Dense Fog in MILWAUKEE, WISCONSIN
From 30-DEC-10 07:00:00 to 31-DEC-10 18:00:00 (CST-6)
Reported by: ASOS

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.

Dense Fog in ROCK, WISCONSIN
From 30-DEC-10 07:00:00 to 31-DEC-10 18:00:00 (CST-6)
Reported by: AWOS

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.

Dense Fog in DANE, WISCONSIN
From 30-DEC-10 07:00:00 to 31-DEC-10 18:00:00 (CST-6)
Reported by: ASOS

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.

Dense Fog in FOND DU LAC, WISCONSIN
From 30-DEC-10 07:00:00 to 31-DEC-10 18:00:00 (CST-6)
Reported by: ASOS

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.

Dense Fog in LAFAYETTE, WISCONSIN
From 29-DEC-10 19:00:00 to 31-DEC-10 18:00:00 (CST-6)
Reported by: Law Enforcement

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.

Dense Fog in MARQUETTE, WISCONSIN
From 30-DEC-10 07:00:00 to 31-DEC-10 18:00:00 (CST-6)
Reported by: Law Enforcement

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.

Dense Fog in IOWA, WISCONSIN
From 29-DEC-10 19:00:00 to 31-DEC-10 18:00:00 (CST-6)
Reported by: AWOS

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.

Dense Fog in GREEN, WISCONSIN
From 29-DEC-10 21:00:00 to 31-DEC-10 18:00:00 (CST-6)
Reported by: AWOS

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.

Dense Fog in SAUK, WISCONSIN
From 30-DEC-10 07:00:00 to 31-DEC-10 18:00:00 (CST-6)
Reported by: AWOS

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.