Dense Fog, Henry
- When
- March 20, 10:30 PM CST to March 21, 10:00 AM CST
- Where
- Henry forecast zone
- Reported by
- AWOS,ASOS,MESONET,ETC
- Coordinates
- 41.353, -90.131 (the zone’s center; the record gives no point)
Dense Fog in Illinois, March 20 to 21, 2000
Dense fog formed in an area where winds were light, the ground was moist, and clear skies allowed rapid radiational cooling. No injuries were reported.
Where it happened
Every event with a place to put it; 7 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
- 7
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 formed in an area where winds were light, the ground was moist, and clear skies allowed rapid radiational cooling. No injuries were reported.
The radar
The national radar mosaic for the moment the first event began.
Event by event
7 dense fog. Local standard time, as filed.
Dense Fog, Carroll
- When
- March 20, 10:30 PM CST to March 21, 10:00 AM CST
- Where
- Carroll forecast zone
- Reported by
- AWOS,ASOS,MESONET,ETC
- Coordinates
- 42.069, -89.934 (the zone’s center; the record gives no point)
Dense Fog, Jo Daviess
- When
- March 20, 10:30 PM CST to March 21, 10:00 AM CST
- Where
- Jo Daviess forecast zone
- Reported by
- AWOS,ASOS,MESONET,ETC
- Coordinates
- 42.366, -90.212 (the zone’s center; the record gives no point)
Dense Fog, Mercer
- When
- March 20, 10:30 PM CST to March 21, 10:00 AM CST
- Where
- Mercer forecast zone
- Reported by
- AWOS,ASOS,MESONET,ETC
- Coordinates
- 41.205, -90.741 (the zone’s center; the record gives no point)
Dense Fog, Rock Island
- When
- March 20, 10:30 PM CST to March 21, 10:00 AM CST
- Where
- Rock Island forecast zone
- Reported by
- AWOS,ASOS,MESONET,ETC
- Coordinates
- 41.467, -90.567 (the zone’s center; the record gives no point)
Dense Fog, Stephenson
- When
- March 20, 10:30 PM CST to March 21, 10:00 AM CST
- Where
- Stephenson forecast zone
- Reported by
- AWOS,ASOS,MESONET,ETC
- Coordinates
- 42.352, -89.662 (the zone’s center; the record gives no point)
Dense Fog, Whiteside
- When
- March 20, 10:30 PM CST to March 21, 10:00 AM CST
- Where
- Whiteside forecast zone
- Reported by
- AWOS,ASOS,MESONET,ETC
- 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
- Winter Storm in Arizona, March 20 to 21, 2000
- High Wind in Utah, March 20 to 21, 2000
- High Wind in California, March 20 to 21, 2000
- High Wind in Nevada, March 20, 2000
- Winter Storm in Colorado, March 20 to 21, 2000
- Winter Storm in Colorado, March 20 to 21, 2000
- Dense Fog in Wisconsin, March 20 to 21, 2000
- Dense Fog in Iowa, March 20 to 21, 2000
- Flash Flooding and Heavy Snow in North Carolina, March 20, 2000
- Winter Storm in Wyoming, March 20, 2000
- Heavy Snow in Colorado, March 20 to 21, 2000
- Flash Flooding in South Carolina, March 20, 2000
More
Every storm in Illinois in 2000Every state in 2000This day in weather historyWarnings in Illinois, March 2000
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: 5134902, 5134903, 5134904, 5134905, 5134906, 5134907, 5134908.