Date post: | 04-Jan-2016 |
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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/
ThunderstormWhat is it?
Small storm with heavy precipitation, frequent thunder & lightning
ThunderstormHow does it form?
• When warm air is forced upward along a cold front & warm, humid air rises rapidly
• In Cumulonimbus clouds (dark, anvil-shaped)
• During Spring/Summer
Go to the Online Textbook…
• Watch Active Art…Ch 12…weather fronts
• http://www.phschool.com/atschool/phsciexp/active_art/weather_fronts/index.html
Thunderstorm rolling in over the city
During a thunderstorm, which comes 1st
lightning or thunder?
LIGHTNING
MCQUEENIS #1!
Thunder always follows LIGHTNING…
Watch a Brainpop on Tornadoes!
• http://www.brainpop.com/science/weather/tornadoes/
TornadoWhat is it?
• Rapidly whirling, funnel-shaped cloud, reaching from the storm cloud to the ground
• Brief, but deadly!
TornadoHow does it form?
• In cumulonimbus clouds with winds at different heights
• In summer/spring
Tornado Alley• as warm, moist
air from the Gulf of Mexico meets cold, dry air from Canada
• 800 or more tornadoes yearly in this area
Watch a Brainpop on Snowstorms!
• http://www.brainpop.com/science/weather/snowflakes/
SnowstormWhat 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
SnowstormHow 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/
HurricaneWhat 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
HurricaneHow 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