Dense Fog in Missouri, November 21, 2012

Name: Dense Fog in Missouri, November 21, 2012
Start: 2012-11-21T05:00
End: 2012-11-21T09:00
Location: Missouri

November 21, 2012 · NWS PAH · 4 events in 4 counties and zones

Widespread dense fog reduced visibility to one-quarter mile or less across the Mississippi River counties of southeast Missouri. Surface high pressure was centered over the mid Mississippi Valley, which resulted in clear and calm conditions conducive to dense fog.

Where it happened

Every event with a place to put it; 4 filed by county or forecast zone are drawn at its center, in a lighter ring. Tap one for its entry below.

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The toll

Deaths: 0
Injuries: 0
Property damage: None recorded
Crop damage: None recorded
Events: 4

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.

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 21, 3:39 AM CST, 1 hour 21 minutes earlier.

Area forecast discussion, Nov 21, 3:39 AM CST, 1 hour 21 minutes before

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Hazardous weather outlook, Nov 21, 4:43 AM CST, 17 minutes before

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In the hours before

Special weather statement, Nov 21, 4:00 AM CST, 1 hour 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

4 dense fog. Local standard time, as filed.

Dense Fog, Cape Girardeau

When: November 21, 5:00 AM CST to 9:00 AM CST
Where: Cape Girardeau forecast zone
Reported by: ASOS
Coordinates: 37.384, -89.684 (the zone’s center; the record gives no point)

Dense Fog, Mississippi

When: November 21, 5:00 AM CST to 9:00 AM CST
Where: Mississippi forecast zone
Reported by: ASOS
Coordinates: 36.828, -89.291 (the zone’s center; the record gives no point)

Dense Fog, Perry

When: November 21, 5:00 AM CST to 9:00 AM CST
Where: Perry forecast zone
Reported by: ASOS
Coordinates: 37.707, -89.824 (the zone’s center; the record gives no point)

Dense Fog, Scott

When: November 21, 5:00 AM CST to 9:00 AM CST
Where: Scott forecast zone
Reported by: ASOS
Coordinates: 37.053, -89.568 (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 Missouri in 2012 Every state in 2012 This day in weather history Warnings in Missouri, November 2012

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 2026-09-30. Each event’s entry at NCEI: 420280, 420281, 420282, 420283.