Take a look at the nature: the sea

One brilliant data source for training data would probably come from the mother nature which  sometimes can be unpredictable. This can be a challenge for weather forecast but deep learning technique can be applied to solve this complex problem.

Back to the basic definitions about the sea, what's the tide? what's the wave?

Here's the difference between them:

1. Tides are formed because of the interaction of the gravitational forces between the Earth, the moon, and the sun.
2. Waves are formed because of the gusting or raging force exerted by the wind on the water surface.
3. Tides are usually generated at the deep oceanic regions while waves are usually seen at shallower areas of the sea.
4. Tides are made by the rising and falling sea levels with the action of gravity while waves are formed when several factors relating to the wind and water interact with each other.

Here's the extract about waves and tides:

Waves are formed when a combination of wind and water variables interact. These variables include: the speed of the wind, the distance of the area where the wind slides, duration of the blowing of the wind, how deep the body of water is, and also the total lateral distance influenced by the fetch. In simple terms, the stronger the wind is and the longer the wind blows, the bigger the waves will be. On the contrary, tides are made by a rising sea level and then water has risen to its highest elevation (reaching high tide) by the action of heavenly gravitational forces for an extended period of time (usually several hours). When the sea level starts to drop for several hours, water appears not to fall thus attaining low tide.

Ref: http://www.differencebetween.net/language/words-language/difference-between-tides-and-waves/#ixzz4uOsmBuQG