Dense Fog, Fond du Lac
- When
- September 4, 1:00 AM CST to 6:30 AM 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 in Wisconsin, September 4, 2009
The combination of high pressure over the Great Lakes Region, clear skies, light winds, and a moist layer of air near the ground allowed for the formation of dense fog overnight. Visibilities were reduced to 1/8 to 1/4 mile.
Where it happened
Every event with a place to put it; 8 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
- 1
- Injuries
- 0
- Property damage
- None recorded
- Crop damage
- None recorded
- Events
- 8
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.
The combination of high pressure over the Great Lakes Region, clear skies, light winds, and a moist layer of air near the ground allowed for the formation of dense fog overnight. Visibilities were reduced to 1/8 to 1/4 mile. Some airplain flights were delayed. Newspapers noted a few vehicle accidents. One occurred in Dodge County at the intersection of STH 60 and CTH DJ/J, about 3 miles east-northeast of Clyman. In this accident, a vehicle didn't stop at the intersection during the dense fog and struck the side of a semitrailer, resulting in the death of the vehicle's driver, a 47-year-old man (indrect death). Law enforcement officials inidicated that the dense fog was probably a factor (but did not directly kill or impact the driver).
The radar
The national radar mosaic for the moment the first event began.
Event by event
8 dense fog. Local standard time, as filed.
Dense Fog, Dodge
- When
- September 4, 1:00 AM CST to 6:30 AM CST
- Where
- Dodge forecast zone
- Deaths
- 0 direct, 1 indirect
- Reported by
- ASOS
- Coordinates
- 43.416, -88.707 (the zone’s center; the record gives no point)
Dense Fog, Jefferson
- When
- September 4, 1:00 AM CST to 6:30 AM CST
- Where
- Jefferson forecast zone
- Reported by
- ASOS
- Coordinates
- 43.021, -88.776 (the zone’s center; the record gives no point)
Dense Fog, Waukesha
- When
- September 4, 1:00 AM CST to 6:30 AM CST
- Where
- Waukesha forecast zone
- Reported by
- ASOS
- Coordinates
- 43.018, -88.304 (the zone’s center; the record gives no point)
Dense Fog, Walworth
- When
- September 4, 1:00 AM CST to 6:30 AM CST
- Where
- Walworth forecast zone
- Reported by
- ASOS
- Coordinates
- 42.669, -88.542 (the zone’s center; the record gives no point)
Dense Fog, Racine
- When
- September 4, 1:00 AM CST to 6:30 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
- September 4, 1:00 AM CST to 6:30 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, Kenosha
- When
- September 4, 1:00 AM CST to 6:30 AM CST
- Where
- Kenosha forecast zone
- Reported by
- ASOS
- Coordinates
- 42.573, -87.840 (the zone’s center; the record gives no point)
The people who died
As the offices recorded each death: direct deaths were caused by the weather itself, indirect ones by something it set in motion.
| Event | Date | Age | Sex | Where | Kind |
|---|---|---|---|---|---|
| Dense Fog, Dodge | 2009-09-04 | 47 | Male | Vehicle/Towed Trailer | Indirect |
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
- Flash Flooding and Hail in Arizona, September 4 to 5, 2009
- Flash Flooding and Debris Flows in Puerto Rico, September 4 to 6, 2009
- Damaging Winds and Lightning Strike in Arkansas, September 4 to 5, 2009
- Heavy Rain in Arkansas, September 4 to 24, 2009
- Flash Flooding and Hail in California, September 4 to 6, 2009
- Flash Flood and Heavy Rain in U.S. Virgin Islands, September 4 to 6, 2009
- Flash Flood and Hail in Arkansas, September 4, 2009
- Marine Thunderstorm Winds in Gulf of Mexico, September 4, 2009
- Waterspout in South Atlantic Coastal Waters, September 4, 2009
- Flash Flood in Kansas, September 4, 2009
- Marine Thunderstorm Wind in South Atlantic Coastal Waters, September 4, 2009
- Hail in Texas, September 4, 2009
More
Every storm in Wisconsin in 2009Every state in 2009This day in weather historyWarnings in Wisconsin, September 2009
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 2026-09-24. Each event’s entry at NCEI: 196674, 196675, 196676, 196677, 196678, 196679, 196680, 196681.