Changing Smoke Conditions from Slide Fire, Flagstaff, Arizona, May 21, 2014

Changing sky conditions and smoke from the Slide fire, a major wildfire near Flagstaff, Arizona, are apparent in this sequence of natural-color, hemispheric images acquired on May 21, 2014. Individual images are collected at 10-minute intervals at the USGS Flagstaff Science Campus by the High Dynamic Range All-Sky Imaging System (HDR-ASIS). The instrument is used in USGS research to study the effects of atmospheric conditions and clouds on photosynthesis and the uptake of atmospheric carbon dioxide by land vegetation.