What is Air Mass?

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

Particles such as pollen, grass seeds, or dust in the air that cause allergies and are transported by winds.

A mass of very cold, dry air that mostly originates over the Arctic Ocean.

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

A term used to identify clouds with a base height below 6,000 feet in the observer's direction. Stratiform clouds consist...

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

Condensation pressure deficit refers to the difference between the actual vapor pressure and the saturation vapor pressure...

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

A bomb cyclone is a large mid-latitude storm that forms when a storm’s central pressure drops (i.e. “bombs out”), resulting...

A long, narrow region in the atmosphere that transport water vapor, like a river in the sky.