Weather Vocabulary

4. The process of a solid (ice) changing directly into a gas (water vapor), or water vapor changing directly into ice, at the same temperature, without ever going through the liquid state (water).
6. A forecast issued by the National Weather Service indicating that a specific weather event is actually occurring
10. The study of the atmosphere and all its phenomena, including weather and how to forecast it.
11. White ice crystals that form on a surface, like the ground or leaves of a plant. Frost is created when the air temperature drops below freezing and the water vapor in the air freezes into ice crystals.
12. It’s visible air pollution in urban areas. It looks like dirty fog in large cities.
14. It’s the ‘feel like’ temperature on a hot day. It is a number that expresses the warming effect of humidity at different temperatures. Only air temperature and relative humidity are used in the calculation.
15. A forecast issued by the National Weather Service indicating that conditions are favorable for a particular weather hazard.

1. The amount of water vapor in the air.
2. The weight of air pressing down on earth. It can change from place to place,and this causes air to move, flowing from areas of high pressure toward areas of lowpressure. It’s the same as barometric pressure
3. Water that forms on objects close to the ground when its temperature falls below the dew point of the surface air.
5. A boundary between two different air masses, resulting in stormy weather. It usually is a line of separation between warm and cold air masses.
7. A period when a region has a lack of rainfall. They can affect a fairly small area for a season or an entire continent for years.
8. Any disturbed state of the atmosphere that creates unpleasant weather like rain, lightning, thunder, hail, snow, sleet, and freezing rain.
9. The temperature at which water starts to condense out of a particular air mass. This temperature changes only when the moisture content of the air changes. The higher it is, the greater the moisture content is in the air.
13. It describes the condition of the air at a particular time and place.