Colorado, 2019

Dense Fog in Colorado, February 28, 2019

February 28, 2019 · NWS GJT · 1 event in 1 county or zone

Residual moisture under northwesterly flow aloft led to areas of dense fog in the Upper Yampa River Basin.

Where it happened

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The toll

Deaths
0
Injuries
0
Property damage
None recorded
Crop damage
None recorded
Events
1

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 GJT wrote it up.

Residual moisture under northwesterly flow aloft led to areas of dense fog in the Upper Yampa River Basin.

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 Grand Junction, CO wrote its last area forecast discussion before the first event at Feb 27, 9:49 PM MST, 6 hours 11 minutes earlier.

Area forecast discussion, Feb 27, 9:49 PM MST, 6 hours 11 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

1 dense fog. Local standard time, as filed.

Dense Fog, Upper Yampa River Basin

When
February 28, 4:00 AM MST to 9:30 AM MST
Where
Upper Yampa River Basin forecast zone
Reported by
AWOS
Coordinates
40.485, -106.991 (the zone’s center; the record gives no point)

Dense fog was observed at the Steamboat Springs-Bob Adams Field Airport with visibility at or below a quarter mile.

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 Colorado in 2019Every state in 2019This day in weather historyWarnings in Colorado, February 2019

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: 800650.