SPRING TIDE: Semi-monthly tide of increased height due to the new or full moon.
SQUALL LINE: A non-frontal band, or line, of thunderstorms.
STATIONARY FRONT: A transition zone between airmasses, with neither advancing upon the other.
SPRING TIDE
A tide of increased range, which occurs about every two weeks when the moon is new or full. SQUALL ...
Spring Tide A tide higher than normal which occurs around the time of the new and full moon.
Spring tide
The tide when ranges between high and low water are greatest. It occurs near full and new moons.
Squall ...
Related term: spring tide
NEGATIVE VORTICITY ADVECTION
The advection of lower values of vorticity into an area.
Compare with a spring tide. NEGATIVE VORTICITY ADVECTION Occurs when the rotation of the atmosphere advects lower values of vorticity into an area. This is created by divergence aloft. Contrast with positive vorticity advection.
For example, the old oceanographic term for the lag in days between the occurrence of syzygy and the highest spring tide is the "age of the tide;" the lag between perigee and the highest perigean tide is the "age of parallax inequality." ...
NEAP TIDE A tide of decreased range, which occurs about every two weeks when the moon is at one quarter or three-quarters full. Related term: spring tide ...
 See also: Winter, Surface, Horizon, Clouds, Storm
  
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