Weather Flashcards

1.Convection Currents Cause predictable global weather patterns Cause local weather patterns Cause all of the Earth’s wind and weather * Air over land will cool faster than air over water *Winds move from HIGH pressure to LOW pressure

2.Coriolis Effect Weather tends to move in curvy, circular patterns because of the Earth’s rotation. This is called ___________________. *Winds moving NORTH curve to the EAST and winds moving SOUTH curve to the WEST.

3. Polar Easterlies There are 3 global wind belts. The _____________ _______________ are from the *poles to the *60 latitude. COLD, dense air moves away from HIGH pressure around the poles and curves west. Brings cold air and snow.

4. Trade Winds There are 3 global wind belts. The __________ ________ blow towards the *equator from *30 latitude. Warm, rising air at the equator moves away and is replaced with cooler air from the North and South. Move the hurricanes across the Atlantic from African coast to the USA.

5. Westerlies There are 3 global wind belts. The ___________ can be found between 30* and 60* latitude. These winds flow from west to east and towards the poles. They carry storms across the United States.

6. Jet Stream High in the atmosphere flowing from West to East. There “river of winds” can reach up to 400km per hour. Do not follow regular paths around the Earth Can help track and predict the movement of the storms.

7. Flashcard AIR PRESSURE is the weight of air that is pressing down. It is measured with a BAROMETER It is also called BAROMETRIC PRESSURE A change in this is a sign that the weather is about to change. *L usually brings cloudy, rainy or snowy weather. *H brings sunny, fair weather

8. Relative Humidity ___________ compares the amount of water vapor in the air to the amount of water vapor it can hold at a certain temperature. It is measured using a _HYGROMETER__ or a _PSYCHROMETER__.

9. Cold Front A ____________ is a place where cold air mass pushes under a warm air mass, forcing warm air to rise sharply. Tall clouds (cumulonimbus) often form. When this front passes, *temperatures drop and the weather clears.

10. Warm Front At a _________ __________, a warm moist air mass slides up and over a cold air mass. Since moist air is rising, clouds usually form. It usually brings *light rain and cloudy weather. After it passes, *temperatures rise and the weather clears.

11. Compass Rose

12. Flashcard Air will be coldest at the POLES and warmest at the EQUATOR.

13. Hurricane A large, rotating low pressure system that forms over warm, tropical waters. Wind speeds at least 120km/h Warm water and moist air give it more energy.

14. 32*F or less What does the temperature need to be for snow or ice to occur

15. Flashcard List two dependable weather information sites. National Oceanic & Atmospheric Association (NOAA) National Weather Service (NWS)

16. Dew Point _____________ is a measure of the temperature at which water vapor will condense on a surface. Like air pressure and temperature, changes in humidity is an indications that the weather will change.