Transcript weather
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, 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/wea
ther_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
Rapidly
whirling,
funnel-shaped
cloud,
reaching from
the storm
cloud to the
ground
What is it?
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/
http://ed.ted.com/lessons/the-science-of-snowflakes-marusabradac#watch
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