Weather

2. occurs when the clockwise motion around a high pressure system pulls in colder air toward the south and west of it
6. an instrument measuring atmospheric pressure
9. an instrument for measuring the speed of the wind, or of any current of gas.
11. a balloon equipped with meteorological apparatus which is sent into the atmosphere to provide information about the weather.
12. places where the atmosphere is relatively thin.
17. a body of air with horizontally uniform temperature, humidity, and pressure.
18. A zone separating two air masses, of which the cooler, denser mass is advancing and replacing the warmer.

1. a weather system that is the boundary separating two different types of air.
3. an instrument for measuring and indicating temperature
4. the air is heavy, and it sinks
5. lines on a weather map that join places of equal pressure.
7. the pressure exerted by the weight of the atmosphere
8. warm air is present behind it (to its south) with cool air ahead of it (to its north)
10. A warm air mass pushes into a colder air mass (the warm front), and then another cold air mass pushes into the warm air mass (the cold front)
13. an instrument used for showing the direction of the wind.
14. a circle showing the principal directions printed on a map or chart.
15. the boundary of an advancing mass of warm air, in particular the leading edge of the warm sector of a low-pressure system.
16. A force that pulls towards the Earth