(COLORADO) – If you’ve been watching our weather coverage, you’ve probably seen us show a smoke forecast graphic (pictured below). It highlights near-surface smoke levels, with darker colors representing thicker concentrations. This graphic helps us track whether conditions are improving or worsening.
But what exactly makes smoke linger or clear out once it’s in our area?
The most obvious source of smoke is wildfires. When those fires spark, whether nearby or hundreds of miles away, winds aloft can carry that smoke directly into Colorado by way of the jet stream, which is the strong winds aloft in a conveyor belt fashion that drives our weather patterns. Once it arrives, the weather pattern we have here in town determines whether it stays put or moves on.
High-pressure systems often make smoke worse. These systems create sinking air and stagnant conditions, keeping smoke trapped near the ground. Sunny days with calm winds mean there’s little chance for the smoke to disperse.
On the flip side, certain weather patterns can bring relief.
Low-pressure systems and cold fronts shake things up. By shifting wind direction, they can redirect smoke away from the region. Stronger wind gusts associated with these systems also help mix and disperse smoke particles.
Thunderstorms provide another boost. Their downdrafts can push cleaner air down to the surface, and rainfall helps wash smoke out of the atmosphere.
Smoke forecasts can change quickly depending on wildfire activity and weather conditions. High pressure tends to trap smoke, while low-pressure systems, fronts, and storms usually help clear it out.
Keeping an eye on these patterns helps us better understand when air quality will worsen or when we can finally get some clearer skies and relief from the smoke.
