Wisconsin, 2009

Dense Fog in Wisconsin, September 10 to 11, 2009

September 10 to 11, 2009 · NWS MKX · 11 events in 11 counties and zones

The combination of high pressure over the Great Lakes Region, light winds, clear skies, and a moist layer of air near the ground allowed for the development of dense fog overnight. Newspaper articles indicated that there were a few vehicle accidents, and there were some delays in aircraft departures at some airports.

Where it happened

Every event with a place to put it; 11 filed by county or forecast zone are drawn at its center, in a lighter ring. Tap one for its entry below.

  • Tornadoes
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  • Wind
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  • Winter weather
  • Heat and drought
  • Cold
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  • Marine and coastal
  • Other

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The toll

Deaths
0
Injuries
0
Property damage
None recorded
Crop damage
None recorded
Events
11

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, light winds, clear skies, and a moist layer of air near the ground allowed for the development of dense fog overnight. Newspaper articles indicated that there were a few vehicle accidents, and there were some delays in aircraft departures at some airports. Visibilities were reduced to 1/8 to 1/4 mile.

The radar

The national radar mosaic for the moment the first event began.

Open the radar archive at this moment

Event by event

11 dense fog. Local standard time, as filed.

Dense Fog, Sheboygan

When
September 10, 11:00 PM CST to September 11, 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, Washington

When
September 10, 11:00 PM CST to September 11, 8:00 AM CST
Where
Washington forecast zone
Reported by
ASOS
Coordinates
43.369, -88.231 (the zone’s center; the record gives no point)

Dense Fog, Ozaukee

When
September 10, 11:00 PM CST to September 11, 8:00 AM CST
Where
Ozaukee forecast zone
Reported by
ASOS
Coordinates
43.403, -87.891 (the zone’s center; the record gives no point)

Dense Fog, Dane

When
September 10, 11:00 PM CST to September 11, 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
September 10, 11:00 PM CST to September 11, 8:00 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 10, 11:00 PM CST to September 11, 8:00 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, Green

When
September 10, 11:00 PM CST to September 11, 8:00 AM CST
Where
Green forecast zone
Reported by
ASOS
Coordinates
42.680, -89.602 (the zone’s center; the record gives no point)

Dense Fog, Rock

When
September 10, 11:00 PM CST to September 11, 8:00 AM CST
Where
Rock forecast zone
Reported by
ASOS
Coordinates
42.671, -89.072 (the zone’s center; the record gives no point)

Dense Fog, Walworth

When
September 10, 11:00 PM CST to September 11, 8:00 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 10, 11:00 PM CST to September 11, 8:00 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
September 10, 11:00 PM CST to September 11, 8:00 AM CST
Where
Kenosha forecast zone
Reported by
ASOS
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 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 2026-10-01. Each event’s entry at NCEI: 196682, 196683, 196684, 196685, 196686, 196687, 196688, 196689, 196690, 196691, 196692.