A cut off low pressure system that has been over the region the last few days finally was departing to the east, leaving behind a moisture laden air mass and areas of locally dense fog across the Central Yampa River Basin in northwest Colorado.
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The episode as NWS GJT wrote it up.
A cut off low pressure system that has been over the region the last few days finally was departing to the east, leaving behind a moisture laden air mass and areas of locally dense fog across the Central Yampa River Basin in northwest Colorado.
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 May 11, 4:30 AM MST, 0 minutes earlier.
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</html>The national radar mosaic for the moment the first event began.
1 dense fog. Local standard time, as filed.
Localized pockets of dense fog developed across the Central Yampa River Basin during the early morning hours of May 11th. This included near the Craig-Moffat County Airport, where the KCAG ASOS reported visibilities down to 1/4 mile or less at times.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Colorado in 2024Every state in 2024This day in weather historyWarnings in Colorado, May 2024
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: 1180556.