Colorado and Utah Smoke Dispersal and Ventilation Rates

Atmospheric River in the Pacific Northwest and Northern Rockies this Weekend

A Pacific storm and atmospheric river will impact the Pacific Northwest states and northern Rockies this weekend, bringing locally heavy low elevations rain and heavy high elevation snow in the mountains. By Sunday over the Interior Northwest, rain combined with snowmelt will increase the risk of flood hazards. Flood Watches are in effect. Read More >

Fire Weather Dashboard

The link above is configured to display smoke dispersal categories as shown here:

	Smoke Dispersal	Vent. Rate, knot-feet (x1000)
	Excellent	150 or greater
	Very Good	100 to 149.99
	Good	60 to 99.99
	Fair	40 to 59.99
	Poor	less than 40

Smoke Dispersal

Vent. Rate, knot-feet (x1000)

Excellent

150 or greater

Very Good

100 to 149.99

Good

60 to 99.99

Fair

40 to 59.99

Poor

less than 40

Ventilation Rate = Transport Wind (kts) x Mixing Height (ft)