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Rain gauge a weather instrument used to measure the amount of rainfall http://farm7.staticflickr.com/6186/6138910321_438fa2f420.jpg Weather vane an instrument that shows the direction of the wind http://farm5.staticflickr.com/4038/4561714246_b0bf4bf555.jpg Flood water that fills up an area of land, usually low land. Can be caused by rivers overflowing due to lots of rain, waves coming ashore, snow melting too fast or dams breaking. http://farm6.staticflickr.com/5047/5354196790_c8ae9307f5.jpg Blizzard very dangerous snow storm with high winds and cold temperatures http://farm3.staticflickr.com/2775/4346550321_24a5c4999b.jpg Tornado rotating funnel of wind that comes from strong thunderstorms. Wind speeds can be more than 250 miles per hour and last about 15 minutes. http://farm7.staticflickr.com/6099/6243916904_6b92748cf0.jpg Temperature How hot or how cold something is Thermometer Instrument used to measure temperature http://farm4.staticflickr.com/3333/3498468965_9df53065ee.jpg Celsius The metric measurement unit for temperature - used by scientists and other countries Fahrenheit The Standard English unit for temperature used in the United States Water Cycle How water moves to land -- evaporation, condensation and precipitation http://farm7.staticflickr.com/6151/6189210449_3305d6b730.jpg Evaporation When water is heated, it turns from liquid to gas (water vapor). (water puddle drying next to the pool on a hot day) http://farm4.staticflickr.com/3108/2926682764_97da7af196.jpg Condensation When water vapor is cooled and turns into liquid (in the sky, this forms a cloud) http://farm3.staticflickr.com/2080/2195468074_ca3ffae5f3.jpg Precipitation Fancy word for rain or snow. Water falls to the ground as rain, snow, sleet or hail. Rain Condensed water vapor that falls to the earth as liquid http://farm4.staticflickr.com/3222/2334488983_24e01bd603.jpg Sleet Ice pellets created by freezing rain as it falls to the ground. It freezing as it falls. http://farm4.staticflickr.com/3248/2982865228_b015e86b96.jpg Hail Large frozen raindrops formed during a thunderstorm. It is frozen before it falls. Can do a lot of damage to homes and cars. http://farm4.staticflickr.com/3084/2649904973_dc252676e3.jpg Snow Water vapor that is frozen into flakes that are usually six sided. http://farm7.staticflickr.com/6236/6341863681_d832132080.jpg Seasons Weather changes that occur at different times of the year. Fall, Winter, Spring, Summer. Flowers bloom and leaves grow on trees in Spring and Summer. Flowers die and leaves fall off trees in Fall. Snow in winter. Thunderstorm A storm with lightning, thunder, rain and sometimes hail. Lightning heat the air up to 54,000 degrees F. http://farm3.staticflickr.com/2455/3744112915_af3493dcdc.jpg Thunder The sound of lightning. Hurricane Large and violent tropical storm. Winds range from 74 to 155 miles per hour. They get their power from water and lose power over the land. http://farm4.staticflickr.com/3024/2828595337_4265cf171b.jpg Drought Long period of dry weather without any rain. This is very bad for growing crops or replacing the water in rivers and lakes. http://farm3.staticflickr.com/2402/2529466333_f5a35dd2fc.jpg Meterologist A scientist who studies the weather using instruments. Weather What is happening ini the air around us.