OLD FAITHFUL WEB CAM
The Old Faithful Web Cam sends a new real-time photo of Old Faithful Geyser approximately every 30 seconds. Although Old Faithful is not the largest or most regular geyser in the park, it has become a popular destination because it erupts more frequently than any of the other big geysers. All predictions are made using a formula that takes into account the length of the previous eruption. The formula used has proven to be accurate, plus or minus 10 minutes, 90% of the time. Web Cam Image Courtesy Of Yellowstone National Park:
MAMMOTH HOT SPRINGS WEBCAM
http://www.nps.gov/archive/yell/tours/livecams/mammoth/mammothcam2.htm