A report of a purported "steam cloud" from Sunset Crater near Flagstaff appears to be mis-identification of a smoke plume from a Forest Service prescribed burn near A-1 Mountain a few miles to the southwest that passed over the crater, or possibly an orographic cloud formation in the lee of San Francisco Peak.
County, state, and federal officials in the Flagstaff area all report that there is no steam or any other activity at the Crater. There is no earthquake activity in the area on the state seismic network that we maintain.
An internet site from Missouri and its YouTube post is getting a lot of online attention and prompting calls to AZGS as well as to local and national government offices over its "Arizona Volcano Alert" posting based on seeing a smudge on a low resolution satellite image. That claim is being spread across the web as a volcanic "ash cloud" or actual volcanic eruption.
Thanks to our colleagues at the National Weather Service, Coconino National Forest, Coconino County Emergency Services, National Park Service, and State Forester's Office, for tracking down the real story.