It’s a large body of air which have the same
temperature & same
amount of water vapor.
Air masses can be formed over:
Dry air mass
Wet air mass “with lots
Types of air masses
Cold & dry
Cold & wet
no or little
Warm & dry
Warm & wet
little or no
It is the border between one mass & another.
Types of fronts
It is formed when a cold air mass pushes under
a warm air mass.
The cold air mass forces the warm air mass up
Thick clouds forms as the warm air rises &
cools & rain falls.
Cold fronts often bring stormy weather.
It is formed when a warm air mass pushes a
cold air mass.
The warm air mass slides up over the cold air.
It forms layers of clouds.
Warm fronts often bring steady rain ,
followed by clear warm weather.
-It’s a fast spinning spiral strong wind that stretches
From the cloud of the thunderstorm to the ground.
-Tornadoes can have wind speeds greater than
400 km per hour.
-USA has more tornadoes in a year than any other
- They are severe snow storms that can last for
- Blizzards have strong winds, blowing snow &
very low air temperature “Cold”
- They are formed over warm water of oceans, it
has a speed of 119 km per hour.
- Hurricanes can last for weeks at the sea.
- The wind of the hurricane spins around the
calm center of the storm called: “Eye”
- Hurricanes can cause flooding.
There are certain weather safety rules
that we should follow in order to be
safe from severe weather conditions.
Watching TV during severe “bad” weather to
get directions about what to do.
Weather sirens are turned on when severe
storm is detected.
Flags are used to warm people from a coming
Evacuation signs are used to tell people to
evacuate “empty” an area when a hurricane is