What is humidity?
At what point does
water condense?
Water vapor in the Dew point
air
What is relative
What instrument
humidity?
measures relative
humidity?
The % of moisture
the air is holding
relative to the
amount it can hold Psychrometer
What must be
What are fair
present in the air
weather clouds
for a cloud to form? called?
Condensation
nuclei
What is a
thunderhead cloud
called?
cumulonimbus
cumulus
What are clouds
called that are
associated with rain
and drizzle?
stratus
What are the
feathery high
altitude clouds
called?
Which type of
cloud is associated
with fair weather,
but can indicate
rain in the next
hours?
cirrus
What are the 4
types of
precipitation?
cirrus
Drops of rain that
fall through a cold
layer of air form __
Rain, sleet, hail,
and snow
sleet
Water vapor that is Water droplets that
changed to a solid hit ice pellets
fall as ______?
form__?
Snow
What causes
freezing rain?
hail
What instrument is
used to measure
rainfall?
Super cooled water
drops
Rain gauge
Large areas of air
with specific
temperatures and
humidity are
called?
What are the 4
main air masses
that affect the US?
Air masses
Where does the
maritime tropical
air mass form?
mT, mP, cP, and
cT.
Where does the
continental tropical
air mass form?
Equator over the
ocean
Over land in SW
US.
Where does the
continental polar
air mass form?
Where does the
maritime polar air
mass form?
Over the North
Atlantic and North
Land in Canada
Pacific Oceans
What happens
What are the 4
when 2 different air types of fronts?
masses meet?
A front forms
Cold, warm,
occluded, and
stationary fronts
What does a cold
front bring?
What does a warm
front bring?
Violent storms,
followed by fair,
cooler drier air
What is an
occluded front?
Rain, followed by
warmer and more
humid air
What is a stationary
front?
When a fast
moving cold front When a cold and
meets up and over warm front meet
takes a warm front and do not move
What does high
pressure bring?
What does low
pressure bring?
Fair cold or warm
air
Change of weather,
rain, drop in
temperature
What pressure
spins clock-wise
and has air blowing
outward?
What pressure
spins counterclock-wise and has
air blowing
inward?
High pressure
Low pressure
What is a marked
by a pressure drop
and a violent
disturbance in the
atmosphere?
storms
When a cold front
overrides a warm
front what forms?
Thunderstorms
What causes
storms?
Meeting of 2 air
masses
What happens
when a discharge
occurs between
clouds and the
ground?
Lightning
Areas of low
What is a cool and
pressure that
dry area that spins
contain rising warm clock-wise called?
air are called?
cyclones
What is the most
powerful cyclone in
the world called?
Anticyclone
Why does a
hurricane not form
in the 0°-5° N/S
latitude?
hurricane
Coriolis not strong
enough
What types of
storm has a calm
center?
What type of storm
causes great tidal
surges?
Hurricane
What type of storm
form in a
cumulonimbus
cloud?
Hurricane
Where do the
majority of the
tornadoes occur in
the US?
Tornado
Tornado Alley
What is the SaffirSimpson scale
measure?
What does the
Fujita scale
measure?
Hurricane strength
with one the
weakest and 5 the
strongest
What is this a
drawing of?
Tornados, the 0 the
weakest and 5 the
strongest
What is this a
drawing of?
High pressure
Low pressure
system, Northern H system, Northern H
What is weather?
What factors cause
weather?
The daily
conditions of the
atmosphere
What does this
mean?
Heat energy, air
pressure, winds,
and moisture
What does this
mean?
H
High pressure
L
Low pressure
What is the
What does low
greenhouse effect? pressure usually
mean?
Gases that trap heat
around the earth
Bad weather
What does high
pressure usually
mean?
Fair weather
What causes wind?
Unequal heating of
the earth
atmosphere
What does this
mean?
What does this
mean?
Very windy
How do winds
travel?
High pressure to
low pressure
Gentle winds
Winds curve to
which direction in
the northern
hemisphere?
Curve to the right
Winds always blow What instrument is
from an area of
used to measure
___pressure to an wind speed?
area of ____
pressure.
High to low
Anemometer
What instrument is Warm up_______,
used to measure the cold air ________.
direction of the
wind?
Weather vane
Rises, sinks
Rising air yields
what kind of
pressure?
Sinking air yields
what kind of
pressure?
Low surface
pressure
Low pressure
brings what kind of
weather?
High surface
pressure
High pressure
brings what kind of
weather?
Lousy, wet
Fair
What does this
mean?
What does this
mean?
Fog
Rain
What does this
mean?
What does this
mean?
Snow
Thunderstorm
What does this
mean?
What does this
mean?
,
drizzle
showers
What does this
mean?
Winds 25kph from
the northwest
What does this
mean?
What does this
mean?
Calm winds
Winds from the
west at 10 kph
What does this
mean?
What does this
mean?
Skies overcast
skies 1/10 cover
What does this
mean?
What does this
mean?
Cold front (blue)
warm front (red)
What does this
mean?
Occluded front
(purple)
What does this
mean?
Stationary front
(red and blue)
What are
isotherms?
What are isobars?
Lines that connect
areas of equal
temperature
Lines that connect
areas of equal
barometric pressure