The National Weather Service has issued a Red Flag Warning for a substantial portion of the Front Range and northeastern Colorado that will remain in effect until 5 p.m. on Thursday. This warning highlights the risks posed by strong winds and exceedingly dry conditions, which could facilitate the rapid spread of wildfires.
The alert encompasses a wide area, including the lower foothills, the I-25 corridor, and adjacent plains, affecting counties such as Jefferson, Douglas, Boulder, Adams, Arapahoe, Weld, Larimer, Elbert, and Lincoln. Meteorologist Kenley Bonner from the National Weather Service in Boulder explained that it is typical for such extensive warnings to occur in this region, particularly when a mountain wave is present. A mountain wave refers to a specific type of atmospheric disturbance where strong upper-level winds encounter the Rocky Mountains at a perpendicular angle, creating turbulence much like water flowing over a rock in a river.
As this turbulent air descends, it accelerates and significantly warms through a process known as compressional warming, contributing to above-average temperatures throughout much of the state. Today’s warmer temperatures, reaching the 60s, correspond with a relative humidity level drop to just 15 percent. This combination of low humidity, sustained winds between 15 and 25 miles per hour, and gusts up to 45 miles per hour creates a precarious situation where even a small spark could ignite a wildfire.
In light of these conditions, residents are urged to refrain from outdoor burning and to avoid activities that might generate sparks. Precautions include being cautious with power tools on dry grasses, avoiding parking on tall vegetation, ensuring vehicle chains do not drag, and properly discarding cigarette butts.
Bonner explained that the above-normal temperatures, expected to linger for the week ahead, can be attributed to a weak La Niña pattern along with a ridge of high pressure over the western United States, which directs moisture and storm systems away from Colorado.
The encouraging news, according to Bonner, is that winds are anticipated to subside by late evening. Until then, it remains crucial for residents along the I-25 corridor to be vigilant against the potential for fast-moving fires. Bonner emphasized the importance of responsible behavior to prevent accidents that could endanger the community.