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Freezing Rain falls as a raindrop, but freezes nearly instantly when it hits the ground.

St. Elmo’s Fire occurs when the masthead of a ship begins to glow due to the buildup of electrical charge. When this happens, lightning can strike within a short time (usually less than 5 minutes).

A Low Pressure System is an area of low relative atmospheric pressure that contains convergent (outward flowing) winds and spins the same direction as the earth – counterclockwise in the Northern hemisphere, clockwise in the Southern hemisphere.

A High Pressure System is an area of high relative atmospheric pressure that spins in the direction opposite of the Earth’s rotation (clockwise in the Northern Hemisphere, counterclockwise in the Southern Hemisphere) and contains divergent (inward flowing) winds.

The Fujita-Pearson Scale is used to measure the intensity of a Tornado based on the amount of destruction the winds may cause dependant on their speed.  Also known as the F Scale, the scale goes from F0 (weak winds, minimal damage) to F5 (violent winds, major damage).

Dew Point (or DewPoint Temperature) measures the amount of moisture in the atmosphere, typically represented as a temperature. The higher the dew point, the more moisture in the air.  When dew point and temperature at equal, the atmosphere is saturated.