Dense Fog, Walworth
- When
- September 29, 11:00 PM CST to September 30, 7:00 AM CST
- Where
- Walworth forecast zone
- Reported by
- AWOS,ASOS,MESONET,ETC
- Coordinates
- 42.669, -88.542 (the zone’s center; the record gives no point)
Dense Fog in Wisconsin, September 29 to 30, 2001
Dense fog developed during the overnight hours over parts of south-central and southeast Wisconsin and persisted until the mid-morning hours. Visibilities were reduced to 1/8 to 1/4 mile, resulting in delayed school openings and delayed airplane traffic.
Where it happened
Every event with a place to put it; 3 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
- 3
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.
Dense fog developed during the overnight hours over parts of south-central and southeast Wisconsin and persisted until the mid-morning hours. Visibilities were reduced to 1/8 to 1/4 mile, resulting in delayed school openings and delayed airplane traffic. Newspaper accounts noted several vehicle accidents. The dense fog was the result of clearing skies and a light west-northwest surface flow behind a weak front that passed through the area earlier.
The radar
The national radar mosaic for the moment the first event began.
Event by event
3 dense fog. Local standard time, as filed.
Dense Fog, Racine
- When
- September 29, 11:00 PM CST to September 30, 7:00 AM CST
- Where
- Racine forecast zone
- Reported by
- AWOS,ASOS,MESONET,ETC
- Coordinates
- 42.730, -87.812 (the zone’s center; the record gives no point)
Dense Fog, Kenosha
- When
- September 29, 11:00 PM CST to September 30, 7:00 AM CST
- Where
- Kenosha forecast zone
- Reported by
- AWOS,ASOS,MESONET,ETC
- Coordinates
- 42.573, -87.840 (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 2001Every state in 2001This day in weather historyWarnings in Wisconsin, September 2001
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: 5268051, 5268052, 5268053.