Dark blue cloudy sky

What is Precipitation?

Any form of water - liquid or solid - that falls from the atmosphere to the Earth's surface, including rain, snow, sleet, and hail.

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Glossary

Considerable cloudiness refers to weather conditions where a large portion of the sky is covered with clouds, but some clear...

A thin, white cloud layer that is intertwined or separate, arranged in regular order, and does not cast a shadow.

A towering cloud that often reaches great altitudes and is associated with thunderstorms, heavy rain, and sometimes severe...

The percentage of water vapor in the air relative to the maximum amount of water vapor the air can hold at a given temperature.

The jet stream forming the boundary between tropical air and sub-tropical air, characterized by isothermal compression and...

The heating of the Earth by the sun causes daily changes in both the direction and speed of the wind. During the day, ground...

Cloud or rain droplets containing pollutants, such as oxides of sulfur and nitrogen, to make them acidic.

A measurement determined by the wave lengths and sea conditions caused by the effect of wind, and by the movement of tree...

The names given to the winds blowing from the four cardinal directions (north, east, south, and west - N, E, S, W) on a compass.

Observation of the sky from the observer's location where there are no clouds, and there is no obstruction to visibility....