Illinois, 2022

Dense Fog in Illinois, December 6 to 7, 2022

December 6 to 7, 2022 · NWS PAH · 10 events in 10 counties and zones

Widespread dense fog reduced visibility to one-quarter mile or less across parts of southern Illinois, mainly along and west of a Mount Vernon to Marion to Metropolis line. The late-night dense fog formed in the vicinity of a surface trough of low pressure extending from the Missouri bootheel northeast along the Ohio River.

Where it happened

Every event with a place to put it; 10 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

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The toll

Deaths
0
Injuries
0
Property damage
None recorded
Crop damage
None recorded
Events
10

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 reduced visibility to one-quarter mile or less across parts of southern Illinois, mainly along and west of a Mount Vernon to Marion to Metropolis line. The late-night dense fog formed in the vicinity of a surface trough of low pressure extending from the Missouri bootheel northeast along the Ohio River.

What forecasters said that day

The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Paducah, KY wrote its last area forecast discussion before the first event at Dec 6, 4:22 PM CST, 5 hours 38 minutes earlier.

Area forecast discussion, Dec 6, 4:22 PM CST, 5 hours 38 minutes before
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Hazardous weather outlook, Dec 6, 2:54 PM CST, 7 hours 6 minutes before
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The radar

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

Open the radar archive at this moment

Event by event

10 dense fog. Local standard time, as filed.

Dense Fog, Alexander

When
December 6, 10:00 PM CST to December 7, 4:00 AM CST
Where
Alexander forecast zone
Reported by
AWOS
Coordinates
37.192, -89.338 (the zone’s center; the record gives no point)

Dense Fog, Pulaski

When
December 6, 10:00 PM CST to December 7, 4:00 AM CST
Where
Pulaski forecast zone
Reported by
AWOS
Coordinates
37.223, -89.127 (the zone’s center; the record gives no point)

Dense Fog, Massac

When
December 6, 10:00 PM CST to December 7, 4:00 AM CST
Where
Massac forecast zone
Reported by
AWOS
Coordinates
37.219, -88.708 (the zone’s center; the record gives no point)

Dense Fog, Johnson

When
December 6, 10:00 PM CST to December 7, 4:00 AM CST
Where
Johnson forecast zone
Reported by
AWOS
Coordinates
37.460, -88.881 (the zone’s center; the record gives no point)

Dense Fog, Union

When
December 6, 10:00 PM CST to December 7, 4:00 AM CST
Where
Union forecast zone
Reported by
AWOS
Coordinates
37.471, -89.255 (the zone’s center; the record gives no point)

Dense Fog, Williamson

When
December 6, 10:00 PM CST to December 7, 4:00 AM CST
Where
Williamson forecast zone
Reported by
AWOS
Coordinates
37.730, -88.930 (the zone’s center; the record gives no point)

Dense Fog, Jackson

When
December 6, 10:00 PM CST to December 7, 4:00 AM CST
Where
Jackson forecast zone
Reported by
ASOS
Coordinates
37.785, -89.382 (the zone’s center; the record gives no point)

Dense Fog, Perry

When
December 6, 10:00 PM CST to December 7, 4:00 AM CST
Where
Perry forecast zone
Reported by
ASOS
Coordinates
38.084, -89.367 (the zone’s center; the record gives no point)

Dense Fog, Franklin

When
December 6, 10:00 PM CST to December 7, 4:00 AM CST
Where
Franklin forecast zone
Reported by
ASOS
Coordinates
37.992, -88.924 (the zone’s center; the record gives no point)

Dense Fog, Jefferson

When
December 6, 10:00 PM CST to December 7, 4:00 AM CST
Where
Jefferson forecast zone
Reported by
AWOS
Coordinates
38.301, -88.924 (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 Illinois in 2022Every state in 2022This day in weather historyWarnings in Illinois, December 2022

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: 1065297, 1065298, 1065299, 1065300, 1065301, 1065302, 1065303, 1065304, 1065305, 1065306.