Dense Fog in Illinois, November 22 to 23, 2025

Name: Dense Fog in Illinois, November 22 to 23, 2025
Start: 2025-11-22T20:00
End: 2025-11-23T10:00
Location: Illinois

November 22 to 23, 2025 · NWS PAH · 15 events in 15 counties and zones

Surface high pressure nosed eastward across southern Illinois. The resultant clear and calm conditions allowed dense fog to develop, generally to the south of Interstate 64.

Where it happened

Every event with a place to put it; 15 filed by county or forecast zone are drawn at its center, in a lighter ring. Tap one for its entry below.

Tornadoes
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Open the live radar over this ground

The toll

Deaths: 0
Injuries: 0
Property damage: None recorded
Crop damage: None recorded
Events: 15

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.

Surface high pressure nosed eastward across southern Illinois. The resultant clear and calm conditions allowed dense fog to develop, generally to the south of Interstate 64.

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 Nov 22, 5:35 PM CST, 2 hours 25 minutes earlier.

Area forecast discussion, Nov 22, 5:35 PM CST, 2 hours 25 minutes before

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Hazardous weather outlook, Nov 22, 12:02 PM CST, 7 hours 58 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

15 dense fog. Local standard time, as filed.

Dense Fog, Johnson

When: November 22, 8:00 PM CST to November 23, 8:00 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, Pope

When: November 22, 8:00 PM CST to November 23, 8:00 AM CST
Where: Pope forecast zone
Reported by: AWOS
Coordinates: 37.413, -88.562 (the zone’s center; the record gives no point)

Dense Fog, Hardin

When: November 22, 8:00 PM CST to November 23, 8:00 AM CST
Where: Hardin forecast zone
Reported by: AWOS
Coordinates: 37.518, -88.267 (the zone’s center; the record gives no point)

Dense Fog, Williamson

When: November 22, 8:00 PM CST to November 23, 10:00 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, Saline

When: November 22, 8:00 PM CST to November 23, 6:00 AM CST
Where: Saline forecast zone
Reported by: AWOS
Coordinates: 37.753, -88.541 (the zone’s center; the record gives no point)

Dense Fog, Gallatin

When: November 22, 8:00 PM CST to November 23, 8:00 AM CST
Where: Gallatin forecast zone
Reported by: AWOS
Coordinates: 37.763, -88.230 (the zone’s center; the record gives no point)

Dense Fog, Hamilton

When: November 22, 8:00 PM CST to November 23, 6:00 AM CST
Where: Hamilton forecast zone
Reported by: AWOS
Coordinates: 38.082, -88.539 (the zone’s center; the record gives no point)

Dense Fog, Jackson

When: November 22, 8:30 PM CST to November 23, 9:30 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, Alexander

When: November 22, 9:00 PM CST to November 23, 7:30 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: November 22, 9:00 PM CST to November 23, 7:30 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, Union

When: November 22, 9:00 PM CST to November 23, 8:00 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, Franklin

When: November 22, 9:00 PM CST to November 23, 5:00 AM CST
Where: Franklin forecast zone
Reported by: AWOS
Coordinates: 37.992, -88.924 (the zone’s center; the record gives no point)

Dense Fog, White

When: November 22, 9:00 PM CST to November 23, 8:00 AM CST
Where: White forecast zone
Reported by: AWOS
Coordinates: 38.088, -88.180 (the zone’s center; the record gives no point)

Dense Fog, Massac

When: November 22, 10:00 PM CST to November 23, 10:00 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, Jefferson

When: November 23, 2:00 AM CST to 5:00 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

Every storm in Illinois in 2025 Every state in 2025 This day in weather history Warnings in Illinois, November 2025

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: 1301764, 1301765, 1301767, 1301771, 1301772, 1301775, 1301778, 1301769, 1301754, 1301757, 1301761, 1301776, 1301780, 1301759, 1301783.