Weather

1. body of air with horizontally uniform temperature, humidity and pressure.
5. instrument for measuring and indicating temperature, typically one consisting of a narrow, hermetically sealed glass tube marked with graduations and having at one end a bulb containing mercury or alcohol that expands and contracts in the tube with heating and cooling.
6. The state of the atmosphere at a place and time as regards heat, dryness, sunshine, wind, rain, etc.
8. instrument for measuring the humidity of the air or a gas.
9. instrument measuring atmospheric pressure, used especially in forecasting the weather and determining altitude.
10. boundary between two air masses.
11. The weather conditions prevailing in an area in general or over a long period.
14. effect An increase or decrease in the frequency of sound, light, or other waves as the source and observer move toward or away from each other. The effect causes the sudden change in pitch noticeable in a passing siren, as well as the redshift seen by astronomers.
15. Winds that reliably blow east to west just north and south of the equator.

2. line on a map connecting points having the same temperature at a given time or on average over a given period.
3. instrument for measuring the speed of the wind, or of any current of gas.
4. fast, narrow current of air flowing from west to east that encircles the globe.
7. Symbolic illustrations showing the weather occurring at a given reporting station.
12. line on a map connecting points having the same atmospheric pressure at a given time or on average over a given period.
13. effect whereby a mass moving in a rotating system experiences a force acting perpendicular to the direction of motion and to the axis of rotation. On the earth, the effect tends to deflect moving objects to the right in the northern hemisphere and to the left in the southern and is important in the formation of cyclonic weather systems.