Not good for Boulder, Colorado. Estimating 50 mph winds tonight and lasting into the morning. CBS4 Denver: Colorado News, Weather, Sports From cbs4denver.com. Send Us News Tips! - cbs4denver.com There are now 550 firefighters working on the Fourmile fire, the most destructive fire in Colorado recorded history. On Thursday afternoon the city of Boulder announced they want residents to take precautions and prepare for possible evacuations in advance of high winds.