Weather and Meteorology - Glossary
Included in this glossary you'll find terms related to our public forecasting program, weather observations and unique terminology that is of Environment Canada's hurricane centre and ice service products.
Sea-level instability/movement in an approximately daily or twice daily period. The movement is caused by the difference of the gravitational attraction between celestial bodies and the centrifugal acceleration of their rotation, and is periodic because it is related to the motion of the sun, earth, and moon.
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