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Marine

	Warning	Advisory	Watch
Storm	Sustained surface winds not associated with a tropical cyclone between 48 knots (55 mph) and 63 knots (73 mph) are occurring or predicted.
Tsunami	The highest level of tsunami alert. Warnings are issued due to the imminent threat of a tsunami from a large undersea earthquake or following confirmation that a potentially destructive tsunami is underway. They may initially be based only on seismic information as a means of providing the earliest possible alert. Widespread, dangerous coastal flooding accompanied by powerful currents is possible and may continue for several hours after arrival of the initial wave. A tsunami is a series of long-period waves caused by a disturbance (i.e. earthquake, underwater volcanic eruptions or landslide) that displaces massive amounts of water. Tsunamis travel at very high speeds, sometimes in excess of 400 knots. While tsunamis may only cause a gentle rise and fall in the water in the open ocean they grow steeper as they approach the shoreline and have been known to reach heights over 100 feet. Warning Safety Tips: Local officials may evacuate low-lying coastal areas and reposition ships to deep waters if there is time to do so safely.		The second highest level of tsunami alert. Watches are issued based on seismic information without confirmation that a destructive tsunami is underway. A tsunami is a series of long-period waves caused by a disturbance (i.e. earthquake, underwater volcanic eruptions or landslide) that displaces massive amounts of water. Tsunamis travel at very high speeds, sometimes in excess of 400 knots. While tsunamis may only cause a gentle rise and fall in the water in the open ocean they grow steeper as they approach the shoreline and have been known to reach heights over 100 feet. Watch Safety Tips: Emergency management officials and the public should prepare to take action.
Gale	Sustained winds (not directly associated with a tropical cyclone) of 34 to 47 knots (39 to 54 mph) are occurring or highly likely.		Sustained winds (not directly associated with a tropical cyclone) of 34 to 47 knots (39 to 54 mph) are occurring or possible.
Marine	Short-term (up to 2 hours) hazardous weather conditions with wind gusts of 34 knots (39 mph) or greater and/or hail ¾” or greater and/or waterspouts.
High Surf	Breaking wave action results in an especially heightened threat to life and property within the surf zone. High surf criteria vary by region.	Breaking wave action results in heightened threat to life and property within the surf zone. High surf criteria vary by region.
Small Craft		Conditions may be hazardous for small craft due to winds, waves or rough bars found near harbor or river entrances.  Thresholds vary by region.

For more marine weather information, visit http://www.weather.gov/om/marine/home.htm.