Dense Fog, Alexander
- When
- December 9, 5:00 AM CST to 9:00 AM CST
- Where
- Alexander forecast zone
- Coordinates
- 37.192, -89.338 (the zone’s center; the record gives no point)
Dense Fog in Illinois, December 9, 1997
Widespread dense fog caused hazardous travel conditions. Visibility was generally a quarter mile or less over the area.
Where it happened
Every event with a place to put it; 19 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
- 19
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 PAH wrote it up.
Widespread dense fog caused hazardous travel conditions. Visibility was generally a quarter mile or less over the area.
The radar
The national radar mosaic for the moment the first event began.
Event by event
19 dense fog. Local standard time, as filed.
Dense Fog, Edwards
- When
- December 9, 5:00 AM CST to 9:00 AM CST
- Where
- Edwards forecast zone
- Coordinates
- 38.417, -88.053 (the zone’s center; the record gives no point)
Dense Fog, Franklin
- When
- December 9, 5:00 AM CST to 9:00 AM CST
- Where
- Franklin forecast zone
- Coordinates
- 37.992, -88.924 (the zone’s center; the record gives no point)
Dense Fog, Gallatin
- When
- December 9, 5:00 AM CST to 9:00 AM CST
- Where
- Gallatin forecast zone
- Coordinates
- 37.763, -88.230 (the zone’s center; the record gives no point)
Dense Fog, Hamilton
- When
- December 9, 5:00 AM CST to 9:00 AM CST
- Where
- Hamilton forecast zone
- Coordinates
- 38.082, -88.539 (the zone’s center; the record gives no point)
Dense Fog, Hardin
- When
- December 9, 5:00 AM CST to 9:00 AM CST
- Where
- Hardin forecast zone
- Coordinates
- 37.518, -88.267 (the zone’s center; the record gives no point)
Dense Fog, Jackson
- When
- December 9, 5:00 AM CST to 9:00 AM CST
- Where
- Jackson forecast zone
- Coordinates
- 37.785, -89.382 (the zone’s center; the record gives no point)
Dense Fog, Jefferson
- When
- December 9, 5:00 AM CST to 9:00 AM CST
- Where
- Jefferson forecast zone
- Coordinates
- 38.301, -88.924 (the zone’s center; the record gives no point)
Dense Fog, Johnson
- When
- December 9, 5:00 AM CST to 9:00 AM CST
- Where
- Johnson forecast zone
- Coordinates
- 37.460, -88.881 (the zone’s center; the record gives no point)
Dense Fog, Massac
- When
- December 9, 5:00 AM CST to 9:00 AM CST
- Where
- Massac forecast zone
- Coordinates
- 37.219, -88.708 (the zone’s center; the record gives no point)
Dense Fog, Perry
- When
- December 9, 5:00 AM CST to 9:00 AM CST
- Where
- Perry forecast zone
- Coordinates
- 38.084, -89.367 (the zone’s center; the record gives no point)
Dense Fog, Pope
- When
- December 9, 5:00 AM CST to 9:00 AM CST
- Where
- Pope forecast zone
- Coordinates
- 37.413, -88.562 (the zone’s center; the record gives no point)
Dense Fog, Pulaski
- When
- December 9, 5:00 AM CST to 9:00 AM CST
- Where
- Pulaski forecast zone
- Coordinates
- 37.223, -89.127 (the zone’s center; the record gives no point)
Dense Fog, Saline
- When
- December 9, 5:00 AM CST to 9:00 AM CST
- Where
- Saline forecast zone
- Coordinates
- 37.753, -88.541 (the zone’s center; the record gives no point)
Dense Fog, Union
- When
- December 9, 5:00 AM CST to 9:00 AM CST
- Where
- Union forecast zone
- Coordinates
- 37.471, -89.255 (the zone’s center; the record gives no point)
Dense Fog, Wabash
- When
- December 9, 5:00 AM CST to 9:00 AM CST
- Where
- Wabash forecast zone
- Coordinates
- 38.446, -87.844 (the zone’s center; the record gives no point)
Dense Fog, Wayne
- When
- December 9, 5:00 AM CST to 9:00 AM CST
- Where
- Wayne forecast zone
- Coordinates
- 38.430, -88.426 (the zone’s center; the record gives no point)
Dense Fog, White
- When
- December 9, 5:00 AM CST to 9:00 AM CST
- Where
- White forecast zone
- Coordinates
- 38.088, -88.180 (the zone’s center; the record gives no point)
Dense Fog, Williamson
- When
- December 9, 5:00 AM CST to 9:00 AM CST
- Where
- Williamson forecast zone
- Coordinates
- 37.730, -88.930 (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
- Hurricane in Guam, December 9 to 16, 1997
- Heavy Snow in Illinois, December 9 to 10, 1997
- Ice Storm and Winter Storm in Kansas, December 9 to 24, 1997
- Dense Fog in Kentucky, December 9, 1997
- Heavy Snow in Iowa, December 9 to 10, 1997
- Heavy Snow in Kansas, December 9, 1997
- Dense Fog in Missouri, December 9, 1997
- Winter Storm in Missouri, December 9, 1997
- High Wind in California, December 9 to 11, 1997
- Heavy Snow in Illinois, December 9 to 10, 1997
- Dense Fog in Indiana, December 9, 1997
- Hail and Damaging Wind in Oklahoma, December 9, 1997
More
Every storm in Illinois in 1997Every state in 1997This day in weather historyWarnings in Illinois, December 1997
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: 5625748, 5625749, 5625750, 5625751, 5625752, 5625753, 5625754, 5625755, 5625756, 5625757, 5625758, 5625759, 5625760, 5625761, 5625762, 5625875, 5625876, 5625877, 5625878.