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Weather
Kate Hall – Wasatch Elementary
What is Barometric Pressure?
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From the Earth to the edge of space, which is about 70
miles, air molecules are stacked on top of each other.
Due to this stacking of molecules the Earth’s air has
pressure.
This pressure is greatest closest to the Earth’s surface
and the pressure lessens as the air goes vertical toward
space.
This pressure can change, it is that pressure change that
brings us our weather.
The changing pressure can affect wind, clouds,
precipitation, and it makes the water cycle continue to
go on and on.
What is a Barometer?
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The instrument we use to judge Barometric
pressure is called a Barometer.
There are numbers on a Barometer that
range from 28 to 31.
A barometer is used for predicting weather
in one to two days, not today.
It is a device used to help predict the
weather.
Barometer (contd.)
If the Barometer drops
below 30 there is going to
be a change in the
weather.
The lower the
Barometer gets,
the worse the
weather gets.
Generally, if the
barometer reads 30 our
area will have nice
weather for two days.
The higher the
Barometer is over 30
the nicer the weather
will be.
Highs and Lows
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The lowest pressure ever recorded was
25.69 inches of mercury in the storm
Typhoon Tip. It was recorded 300 miles
west of the island of Guam in the Pacific
Ocean.
The highest pressure was observed at Agata
Lake in Siberia on December 31, 1968. The
barometric Pressure measured 32.01. The
temperature was -46 degrees C.
The Highs and Lows of Weather
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How do weather forecasters know what the
weather is going to be?
The Capital L’s on the weather map mean that
area has a low pressure over it and is going to
have stormy weather for the next couple of
days.
The Capital H’s mean there is a high pressure
over that area and that area will have good
weather for the next couple of days.
Do you see any other symbols around the H’s
and L’s?
Weather Prediction
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Charlotte, NC
Conditions as of 9:52 AM Clear
Temperature: 50°
Wind chill: 47°
Wind: NNW 8 mph
Humidity: 46%
Dew point: 30°
Pressure: 29.94 in.
Visibility: 10.0 miles
Observed at: Charlotte, NC
Weather Prediction
Clearfield, UT- Conditions as of 8:25 am
Mountain Time.
Wind: From S at 18 mph
Humidity: 54%
Temperature: 29 Degrees
Pressure: 30.19 in.
Dew Point: 17 degrees F
Visibility: 3 miles
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Clouds
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A cloud is millions of water droplets
condensed on dust particles.
There are three different types of clouds
Cirrus
Cumulus
Stratus
Severe Weather
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Hurricanes are formed over warm waters in
the ocean. Hurricanes do move in a circular
motion and cover a LARGE area.
Severe Weather
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A tornado is a whirlpool of windy air over land.
Winds can be 300 miles per hour. The path of a
tornado can cover several miles but the width of a
tornado is much smaller than a hurricane usually
covering an area smaller thank 100 yards.
Severe Weather
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A thunderstorm is a storm with rain, high
winds, dark clouds, lightning and thunder.
Rainstorms
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Rainstorms have dark clouds, rain showers
and breezes.
Precipitation
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Rain, Sleet Hail and Snow are all called
precipitation, they are forms of water that
fall from the sky.
Temperatures
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Freezing
Boiling
Water Boils at
212 Degrees F.