National Weather Service United States Department of Commerce

Lingering Cold, Snow, and Winds in the East Folowing Arctic Cold Front; Above Normal Temperatures in the West

Areas of heavy snow and gusty winds will continue over the Great Lakes, central Appalachians, and Upstate New York overnight into Friday before another fast moving clipper arrives with more snow this weekend. Below normal temperatures will remain in place across much of the southern and eastern U.S. on Friday while the western U.S. sees above normal temperatures. Read More >

Smoke dispersal is categorized by using the Ventilation Rate. Ventilation Rate forecasts for a specific point can be found using the Fire Weather Dashboard. Click a spot on the map and scroll down to find daily and hourly Ventilation Rate values for the next few days.

 

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

 

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