Dense Fog, Marquette
- When
- March 20, 12:00 AM CST to 10:00 AM CST
- Where
- Marquette forecast zone
- Reported by
- AWOS,ASOS,MESONET,ETC
- Coordinates
- 43.820, -89.399 (the zone’s center; the record gives no point)
Dense Fog in Wisconsin, March 20, 2003
Dense fog developed early on March 20th, and dropped visibilities to 1/4 mile or less. ).
Where it happened
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.
- 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
- 20
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 early on March 20th, and dropped visibilities to 1/4 mile or less. The lowest visibility was 20 to 30 feet in Mequon (Ozaukee Co.). Air traffic was delayed or grounded at both Milwaukee's Mitchell Field (Milwaukee Co.), and Dane County Regional Airport (Madison-Truax Field). Several school districts delayed school openings by 2 hours, and newspapers reported many vehicle accidents. The dense fog was the result of clear skies, a light south-southeast surface wind, and leftover, low-level moisture.
The radar
The national radar mosaic for the moment the first event began.
Event by event
20 dense fog. Local standard time, as filed.
Dense Fog, Green Lake
- When
- March 20, 12:00 AM CST to 10:00 AM CST
- Where
- Green Lake forecast zone
- Reported by
- AWOS,ASOS,MESONET,ETC
- Coordinates
- 43.800, -89.045 (the zone’s center; the record gives no point)
Dense Fog, Fond du Lac
- When
- March 20, 12:00 AM CST to 10:00 AM CST
- Where
- Fond du Lac forecast zone
- Reported by
- AWOS,ASOS,MESONET,ETC
- Coordinates
- 43.754, -88.488 (the zone’s center; the record gives no point)
Dense Fog, Sheboygan
- When
- March 20, 12:00 AM CST to 10:00 AM CST
- Where
- Sheboygan forecast zone
- Reported by
- AWOS,ASOS,MESONET,ETC
- Coordinates
- 43.756, -87.800 (the zone’s center; the record gives no point)
Dense Fog, Sauk
- When
- March 20, 12:00 AM CST to 10:00 AM CST
- Where
- Sauk forecast zone
- Reported by
- AWOS,ASOS,MESONET,ETC
- Coordinates
- 43.427, -89.948 (the zone’s center; the record gives no point)
Dense Fog, Columbia
- When
- March 20, 12:00 AM CST to 10:00 AM CST
- Where
- Columbia forecast zone
- Reported by
- AWOS,ASOS,MESONET,ETC
- Coordinates
- 43.467, -89.334 (the zone’s center; the record gives no point)
Dense Fog, Dodge
- When
- March 20, 12:00 AM CST to 10:00 AM CST
- Where
- Dodge forecast zone
- Reported by
- AWOS,ASOS,MESONET,ETC
- Coordinates
- 43.416, -88.707 (the zone’s center; the record gives no point)
Dense Fog, Washington
- When
- March 20, 12:00 AM CST to 10:00 AM CST
- Where
- Washington forecast zone
- Reported by
- AWOS,ASOS,MESONET,ETC
- Coordinates
- 43.369, -88.231 (the zone’s center; the record gives no point)
Dense Fog, Ozaukee
- When
- March 20, 12:00 AM CST to 10:00 AM CST
- Where
- Ozaukee forecast zone
- Reported by
- AWOS,ASOS,MESONET,ETC
- Coordinates
- 43.403, -87.891 (the zone’s center; the record gives no point)
Dense Fog, Iowa
- When
- March 20, 12:00 AM CST to 10:00 AM CST
- Where
- Iowa forecast zone
- Reported by
- AWOS,ASOS,MESONET,ETC
- Coordinates
- 43.001, -90.135 (the zone’s center; the record gives no point)
Dense Fog, Dane
- When
- March 20, 12:00 AM CST to 10:00 AM CST
- Where
- Dane forecast zone
- Reported by
- AWOS,ASOS,MESONET,ETC
- Coordinates
- 43.067, -89.418 (the zone’s center; the record gives no point)
Dense Fog, Jefferson
- When
- March 20, 12:00 AM CST to 10:00 AM CST
- Where
- Jefferson forecast zone
- Reported by
- AWOS,ASOS,MESONET,ETC
- Coordinates
- 43.021, -88.776 (the zone’s center; the record gives no point)
Dense Fog, Waukesha
- When
- March 20, 12:00 AM CST to 10:00 AM CST
- Where
- Waukesha forecast zone
- Reported by
- AWOS,ASOS,MESONET,ETC
- Coordinates
- 43.018, -88.304 (the zone’s center; the record gives no point)
Dense Fog, Milwaukee
- When
- March 20, 12:00 AM CST to 10:00 AM CST
- Where
- Milwaukee forecast zone
- Reported by
- AWOS,ASOS,MESONET,ETC
- Coordinates
- 43.022, -87.929 (the zone’s center; the record gives no point)
Dense Fog, Lafayette
- When
- March 20, 12:00 AM CST to 10:00 AM CST
- Where
- Lafayette forecast zone
- Reported by
- AWOS,ASOS,MESONET,ETC
- Coordinates
- 42.661, -90.132 (the zone’s center; the record gives no point)
Dense Fog, Green
- When
- March 20, 12:00 AM CST to 10:00 AM CST
- Where
- Green forecast zone
- Reported by
- AWOS,ASOS,MESONET,ETC
- Coordinates
- 42.680, -89.602 (the zone’s center; the record gives no point)
Dense Fog, Rock
- When
- March 20, 12:00 AM CST to 10:00 AM CST
- Where
- Rock forecast zone
- Reported by
- AWOS,ASOS,MESONET,ETC
- Coordinates
- 42.671, -89.072 (the zone’s center; the record gives no point)
Dense Fog, Walworth
- When
- March 20, 12:00 AM CST to 10:00 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, Racine
- When
- March 20, 12:00 AM CST to 10:00 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
- March 20, 12:00 AM CST to 10:00 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
- Tornado in Georgia, March 20, 2003
- Tornado in Georgia, March 20, 2003
- Tornado in Florida, March 20, 2003
- Flood in North Carolina, March 20 to 21, 2003
- Flood in North Carolina, March 20, 2003
- Flood in North Carolina, March 20, 2003
- Flood in South Carolina, March 20, 2003
- Flood in South Carolina, March 20 to 21, 2003
- Flood in North Carolina, March 20 to 24, 2003
- Flood in North Carolina, March 20, 2003
- Flood in North Carolina, March 20, 2003
- Flash Flooding and Flooding in Virginia, March 20 to 24, 2003
More
Every storm in Wisconsin in 2003Every state in 2003This day in weather historyWarnings in Wisconsin, March 2003
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: 5342737, 5342738, 5342739, 5342740, 5342741, 5342742, 5342743, 5342744, 5342745, 5342746, 5342747, 5342748, 5342749, 5342750, 5342751, 5342752, 5342753, 5342754, 5342755, 5342756.