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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, 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