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STORMS & PRECIPITATION S6E4 Types of Storms: • Thunderstorm • Tornado • Snowstorm • Hurricane Watch a Brainpop on Thunderstorms! • http://www.brainpop.com/science/weather/ thunderstorms/ Thunderstorm What is it? Small storm with heavy precipitation, frequent thunder & lightning Thunderstorm How does it form? • When warm air is forced upward along a cold front & warm, humid air rises rapidly • In Cumulonimbus clouds (dark, anvilshaped) • During Spring/Summer Go to the Online Textbook… • Watch Active Art…Ch 12…weather fronts • http://www.phschool.com/atschool/phsciex p/active_art/weather_fronts/index.html Thunderstorm rolling in over the city During a thunderstorm, which comes 1st lightning or thunder? LIGHTNING MCQUEEN IS #1! Thunder always follows LIGHTNING… Watch a Brainpop on Tornadoes! • http://www.brainpop.com/science/weather/ tornadoes/ Tornado What is it? • Rapidly whirling, funnel-shaped cloud, reaching from the storm cloud to the ground • Brief, but deadly! Tornado How does it form? • In cumulonimbus clouds with winds at different heights • In summer/spring • as warm, moist air from the Gulf of Mexico meets cold, dry air from Canada • 800 or more tornadoes yearly in this area Tornado Alley Watch a Brainpop on Snowstorms! • http://www.brainpop.com/science/weather/ snowflakes/ Snowstorm What is it? • Heavy snowfalls that block roads • Trap people in their cars/homes • Blowing wind make people lose their way Blinding snow can disorient people Snowstorm How does it form? • Extreme cold • Air colder than 32°F ALL the way to the ground Watch a Brainpop on Hurricanes! • http://www.brainpop.com/science/weather/ hurricanes/ Hurricane What is it? • A tropical cyclone • Winds 119 km/hr or higher • May be 600 km wide Hurricane • Forms in the Atlantic, Pacific & Indian Oceans • Called a Typhoon in the western Pacific • Hurricane Season in U.S. from July - Nov • Eye (center) is calm Hurricane How does it form? • Begins over warm ocean water as a tropical depression → tropical storm → hurricane • Last ≥ 1 week • Loses strength as it crosses land – no water = no hurricane Storms bring precipitation… 5 Types of Precipitation • • • • • Rain Hail Snow Sleet Freezing Rain Depend on the temps! Rain • Drizzle • Mist • Large drops • Falls when the temps are above freezing (32°F) Hail • Round pellets tossed around in cumulonimbus clouds like a rock tumbler • During thunderstorms • Forms at any temp Snow • Powdery snow falls through cold, dry air • Clumps together as it falls through humid (wet) air • Temps below freezing • Water vapor in clouds made directly into ice crystals → SNOW! Sleet • Raindrops that fall through air that is below freezing point of water (32°F) Freezing Rain • Happens a lot in GA in the winter! • Raindrops fall through cold air, then freeze as they hit frozen surfaces
