Marshall, CO weather, extreme wind exposure, and fire risk. The unincorporated Boulder County community where the 2021 Marshall Fire began. Elevation 5,500 ft.

Coal Creek Canyon, CO weather, elevation gradient, and fire risk. A tri-county mountain community on Highway 72 spanning 6,200 to 9,400 feet.

CDPHE's Ozone Action Day alerts track ground-level ozone, not wildfire smoke -- a separate summer hazard for the Denver-Boulder area, and how to read one.

Eldorado Springs, CO weather, canyon-mouth wind, and flood risk. Rock-climbing hamlet on South Boulder Creek at the Eldorado Canyon mouth. Elevation 5,732 ft.

Pine Brook Hill, CO weather and wildfire exposure. A foothills community 1,000 feet above north Boulder sharing its 80304 zip. Elevation 6,400 ft.

Sugarloaf, CO weather, snow line, and extreme fire risk. Mountain community at 7,200 feet marking the southern edge of the 2010 Fourmile Canyon Fire.

Gold Hill, CO weather, autumn fire season, and mountain snow. Historic mining town at 8,463 feet inside the 2010 Fourmile Canyon Fire burn area.

The meteorology behind Colorado's Marshall Fire of December 30, 2021 — hurricane-force downslope winds, extreme drought, single-digit humidity, and what the red-flag setup teaches Boulder County residents.

Nederland, CO weather, fire risk, and stream flow at 8,228 ft. High mountain town on Middle Boulder Creek near the Cold Springs Fire burn and Barker Reservoir.

Eldora, CO mountain and ski-community weather at 8,642 ft. Deep snow, Continental Divide winds, and extreme fire risk west of Nederland in Boulder County.