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R is for Romeo, who really has no purpose

-Radiative Equilibrium Temperature - the temperature achieved when an object behaving as a blackbody is absorbing and emitting radiation at equal rates

-Radiational Cooling – the process by which the earth’s surface and adjacent air cool by emitting infrared radiation

-Radiation Inversion – an increase in temperature with height due to radiational cooling of the earth’s surface. Also called a nocturnal inversion.

-Reflection - light bounced back or returned from a source. Note that the Angle of Incidence will be equal to the Angle of Return.

-Return stroke – the luminous light that proceeds from the ground upward to the base of a cloud

-Roll cloud – a roll-shaped, dense and elongated cloud that seems to slowly spin about a horizontal axis behind the leading edge of a thunderstorm’s gust front

-Romeo - in terms of flag signals, it has no meaning on it's own, though it is used in conjunction with other flags in multi-flag signals