Alert archive / Missouri / Dense Fog Advisories in 2021

Dense Fog Advisory 12, NWS St. Louis, MO

December 29, 202121 counties in Missouri; 11 counties in Illinois

NWS St. Louis, MO issued this dense fog advisory at Dec 29, 2021, 10:09 PM CST for 21 counties in Missouri; 11 counties in Illinois. It was in force for 14 hr.

The area

The counties it named.

The facts

Issued: Dec 29, 2021, 10:09 PM CST (04:09 UTC)
Expired: Dec 30, 2021, 12:00 PM CST
In force: 14 hr
Issued by: NWS St. Louis, MO

All 32 counties

Bond County, IL, Calhoun County, IL, Clinton County, IL, Fayette County, IL, Jersey County, IL, Madison County, IL, Marion County, IL, Monroe County, IL, Randolph County, IL, Saint Clair County, IL, Washington County, IL, Boone County, MO, Callaway County, MO, City of Saint Louis, MO, Cole County, MO, Crawford County, MO, Franklin County, MO, Gasconade County, MO, Iron County, MO, Jefferson County, MO, Lincoln County, MO, Madison County, MO, Moniteau County, MO, Montgomery County, MO, Osage County, MO, Reynolds County, MO, Saint Charles County, MO, Saint Francois County, MO, Saint Louis County, MO, Sainte Genevieve County, MO, Warren County, MO, Washington County, MO

The radar

The St Louis radar (KLSX), 27 km from the middle of the area, began a volume at 04:13 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

What forecasters said that day

The local office's own words before this dense fog advisory went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS St. Louis, MO wrote its last area forecast discussion before this dense fog advisory went out at Dec 29, 9:15 PM CST, 54 minutes earlier.

Area forecast discussion, Dec 29, 9:15 PM CST, 54 minutes before

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Nearby

Dense Fog Advisories in Missouri, 2021 Dense Fog Advisories in Illinois, 2021 Every dense fog advisory in 2021

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; radar from the NEXRAD Level II archive.