– the process of a liquid changing into a vapor or gas.

– a basic forecast of general weather conditions three to five days in the future.

– Determining the value of a meteorological value beyond the bounds of a data sample.

– the Federal Aviation Administration.

– the standard scale used to measure temperature in the United States; in which the freezing point of water is thirty-two degrees and the boiling point is two hundred and twelve degrees.

– Less than 4/10 opaque cloud cover, no precipitation, and no extremes in temperature, visibility or winds.