Dense Fog, Upper Treasure Valley
- When
- January 9, 2:00 AM MST to 11:00 AM MST
- Where
- Upper Treasure Valley forecast zone
- Reported by
- OFFICIAL NWS OBS.
- Coordinates
- 43.129, -115.960 (the zone’s center; the record gives no point)
Dense Fog in Idaho, January 9, 2002
Dense fog developed along the Treasure Valley, Long Valley and locally in the Western Magic Valley on the morning of January 9th. Visibilities were reduced to less than a quarter mile at the Boise Airport.
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.
- Tornadoes
- Tropical storms and surge
- Floods
- Wind
- Hail
- Winter weather
- Heat and drought
- Cold
- Fire, smoke and dust
- Marine and coastal
- Other
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 BOI wrote it up.
Dense fog developed along the Treasure Valley, Long Valley and locally in the Western Magic Valley on the morning of January 9th. Visibilities were reduced to less than a quarter mile at the Boise Airport. Law enforcement reported icy roads in the West Central Mountains but no accidents were reported. Visibilities had improved by 11 am.
The radar
The national radar mosaic for the moment the first event began.
Event by event
4 dense fog. Local standard time, as filed.
Dense Fog, West Central Mountains
- When
- January 9, 6:00 AM MST to 11:00 AM MST
- Where
- West Central Mountains forecast zone
- Reported by
- OFFICIAL NWS OBS.
- Coordinates
- 44.543, -116.300 (the zone’s center; the record gives no point)
Dense Fog, Lower Treasure Valley
- When
- January 9, 8:00 AM MST to 11:00 AM MST
- Where
- Lower Treasure Valley forecast zone
- Reported by
- OFFICIAL NWS OBS.
- Coordinates
- 43.746, -116.564 (the zone’s center; the record gives no point)
Dense Fog, Western Magic Valley
- When
- January 9, 10:00 AM MST to 11:00 AM MST
- Where
- Western Magic Valley forecast zone
- Reported by
- OFFICIAL NWS OBS.
- Coordinates
- 42.672, -114.581 (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
- Sleet in Pennsylvania, January 9, 2002
- Winter Weather in Maryland, January 9, 2002
- Sleet in New Jersey, January 9, 2002
- Heavy Snow in Colorado, January 9 to 10, 2002
- Extreme Cold in Florida, January 9, 2002
- Blizzard in Alaska, January 9 to 10, 2002
- Heavy Snow in Colorado, January 9 to 10, 2002
- Winter Weather in Virginia, January 9, 2002
- High Wind in Alaska, January 9, 2002
More
Every storm in Idaho in 2002Every state in 2002This day in weather historyWarnings in Idaho, January 2002
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: 5280072, 5280070, 5280069, 5280071.