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About the Old Faithful Geyser PredictionsAll 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. Many WebCam visitors wonder why there isn't a prediction posted first thing in the morning and why there is an outdated prediction up in the evening? The prediction information is only posted during the open-hours of the Old Faithful Visitor Center. It cannot be posted until after the ranger at the information desk observes the first open-hours eruption of the day. The formula uses the length of the previous eruption to predict the time of the next eruption. Therefore, anyone interested in Old Faithful Geyser predictions should also be interested in the open hours of the Old Faithful Visitor Center. If there are predictions posted outside the hours mentioned, it is due to the overtime or good will of the ranger staff at the Old Faithful Visitor Center. The Old Faithful Visitor Center is open on the following schedule: Summer Season Winter Season Spring & Fall Seasons
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Last Updated:
Saturday, 20-Aug-2005 20:58:40 Eastern Daylight Time
http://www.nps.gov
/archive/yell/tours/livecams/oldfaithful/OFVChours.htm