Dense Fog, Bureau
- When
- December 12, 11:00 PM CST to December 13, 1:00 PM CST
- Where
- Bureau forecast zone
- Reported by
- LAW ENFORCEMENT
- Coordinates
- 41.404, -89.529 (the zone’s center; the record gives no point)
Dense Fog in Illinois, December 12 to 13, 1999
Dense fog combined with freezing temperatures to deposit a thin layer of ice on many roads. Several accidents were reported.
Where it happened
Every event with a place to put it; 13 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
- 13
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 DVN wrote it up.
Dense fog combined with freezing temperatures to deposit a thin layer of ice on many roads. Several accidents were reported.
The radar
The national radar mosaic for the moment the first event began.
Event by event
13 dense fog. Local standard time, as filed.
Dense Fog, Carroll
- When
- December 12, 11:00 PM CST to December 13, 1:00 PM CST
- Where
- Carroll forecast zone
- Reported by
- LAW ENFORCEMENT
- Coordinates
- 42.069, -89.934 (the zone’s center; the record gives no point)
Dense Fog, Hancock
- When
- December 12, 11:00 PM CST to December 13, 1:00 PM CST
- Where
- Hancock forecast zone
- Reported by
- LAW ENFORCEMENT
- Coordinates
- 40.404, -91.165 (the zone’s center; the record gives no point)
Dense Fog, Henderson
- When
- December 12, 11:00 PM CST to December 13, 1:00 PM CST
- Where
- Henderson forecast zone
- Reported by
- LAW ENFORCEMENT
- Coordinates
- 40.818, -90.925 (the zone’s center; the record gives no point)
Dense Fog, Henry
- When
- December 12, 11:00 PM CST to December 13, 1:00 PM CST
- Where
- Henry forecast zone
- Reported by
- LAW ENFORCEMENT
- Coordinates
- 41.353, -90.131 (the zone’s center; the record gives no point)
Dense Fog, Jo Daviess
- When
- December 12, 11:00 PM CST to December 13, 1:00 PM CST
- Where
- Jo Daviess forecast zone
- Reported by
- LAW ENFORCEMENT
- Coordinates
- 42.366, -90.212 (the zone’s center; the record gives no point)
Dense Fog, McDonough
- When
- December 12, 11:00 PM CST to December 13, 1:00 PM CST
- Where
- McDonough forecast zone
- Reported by
- LAW ENFORCEMENT
- Coordinates
- 40.456, -90.678 (the zone’s center; the record gives no point)
Dense Fog, Mercer
- When
- December 12, 11:00 PM CST to December 13, 1:00 PM CST
- Where
- Mercer forecast zone
- Reported by
- LAW ENFORCEMENT
- Coordinates
- 41.205, -90.741 (the zone’s center; the record gives no point)
Dense Fog, Putnam
- When
- December 12, 11:00 PM CST to December 13, 1:00 PM CST
- Where
- Putnam forecast zone
- Reported by
- LAW ENFORCEMENT
- Coordinates
- 41.205, -89.286 (the zone’s center; the record gives no point)
Dense Fog, Rock Island
- When
- December 12, 11:00 PM CST to December 13, 1:00 PM CST
- Where
- Rock Island forecast zone
- Reported by
- LAW ENFORCEMENT
- Coordinates
- 41.467, -90.567 (the zone’s center; the record gives no point)
Dense Fog, Stephenson
- When
- December 12, 11:00 PM CST to December 13, 1:00 PM CST
- Where
- Stephenson forecast zone
- Reported by
- LAW ENFORCEMENT
- Coordinates
- 42.352, -89.662 (the zone’s center; the record gives no point)
Dense Fog, Warren
- When
- December 12, 11:00 PM CST to December 13, 1:00 PM CST
- Where
- Warren forecast zone
- Reported by
- LAW ENFORCEMENT
- Coordinates
- 40.849, -90.615 (the zone’s center; the record gives no point)
Dense Fog, Whiteside
- When
- December 12, 11:00 PM CST to December 13, 1:00 PM CST
- Where
- Whiteside forecast zone
- Reported by
- LAW ENFORCEMENT
- Coordinates
- 41.756, -89.914 (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
- Dense Fog in Wisconsin, December 12 to 13, 1999
- Dense Fog in Iowa, December 12 to 13, 1999
- Damaging Wind in Louisiana, December 12, 1999
- Cold in California, December 12 to 13, 1999
- Heavy Snow in Montana, December 12 to 13, 1999
- Dense Fog in Wisconsin, December 12 to 13, 1999
- Heavy Snow in Idaho, December 12 to 13, 1999
- Heavy Snow and High Wind in Nevada, December 12 to 13, 1999
- Winter Storm in Idaho, December 12 to 13, 1999
- Frost and Freeze in California, December 12, 1999
- High Wind in Oregon, December 12, 1999
- Heavy Snow in Idaho, December 12 to 13, 1999
More
Every storm in Illinois in 1999Every state in 1999This day in weather historyWarnings in Illinois, December 1999
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: 5721737, 5721738, 5721739, 5721740, 5721741, 5721742, 5721743, 5721744, 5721745, 5721746, 5721747, 5721748, 5721749.