Get notified when the world's most famous geyser is going to erupt! If you are in Yellowstone and are planning on seeing Old Faithful, get the app that won't let you miss an eruption. The app can alert you when an eruption is imminent. It will also automatically update so you can be sure that the countdown is as accurate as information is available. PREDICTIONS ARE NOT ALWAYS AVAILABLE! Customizations include enable/disable auto synchronization, configurable sync period, enable sound, vibrate or visual notification, and alarm thresholds.