Radar Echo -
Microwaves scattered by distant rain or snow back to the receiver where they are displayed as bright spots on a cathode ray tube.
April 21, 2019
The dissipation of a frontal zone due to a weakening contrast between two air masses. The temperature gradient weakens during frontolysis, meaning the rate of change of the temperature along the frontal boundary is lessening. At the end of frontolysis, the front no longer exists. The opposite of frontolysis is frontogenesis.
April 20, 2019
An sharpened zone of cyclonic wind change usually associated with a zone of lower pressure, and can occur many places without actually becoming a front (lee-side a mountain chain, behind frontal zones, etc)
April 19, 2019
An arc of concentric colored bands formed by refraction and internal reflection of sunlight by falling raindrops
April 18, 2019
Zodiacal Light -
Is a softly luminous cone of white light visible from an hour or so after sunset or before dawn
April 17, 2019
A trough of warm air aloft. It is usually a similar type of frontal structure as an occlusion, but not always. The term more used abroad than in the US.