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Weather Notes Unit 1 – Part 2
Weather, Climate Change and
Society
Part 2 – Chapter 2
Textbook P. 43-89
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Measuring Weather Data
Weather forecasting – involves predicting what the future weather will be
based on ongoing observations of atmospheric conditions.
Involves qualitative data – observations that involve senses
Involves quanitative data – observations based on measured data
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1)Anemometer – is a device used to
measure wind speed
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High air pressure in a region indicates fair weather while low pressure indicates that storms are more likely.
Normal barometer
reading 103.1 kPa
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11
5.
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6. Weather satellite – space craft that orbits the earth collecting weather
related data to send messages to weather stations on earth
7. Weather Balloons – helium filled balloons that have weather
equipment attached – released into the atmosphere to collect weather
related data.
8. Computers – data collected are analyzed and presents as weather
forecasts
9. Radar – useful to track and detect severe weather (thunderstorms,
hurricane, etc.
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Humidity Humidity:
a measure of the amount of water vapor in the air
Warm air can hold more moisture then cold air
Relative Humidity:
The measure of the amount of water vapor compared to the Maximum amount possible
Other important weather related terms!!
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Saturated Air
Relative humidity is 100%
Over 100% results in condensation
Dew Point
Temp at which dew forms
As air gets colder, it holds less moisture
Releases excess as dew
Large amounts of energy is needed to
overcome the forces of attraction
between water molecules in the
atmosphere in order for water to
evaporate, while large amounts of
energy is released when water
molecules condense!!
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Effects of Humidity
Higher humidity
causes perspiration to evaporate slowly.
Sweating doesn’t cool us as well
Low humidity
Air is dryer
Skin may be
uncomfortable
Humidex:
Reports how hot the
humidity makes us feel
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Analyzing a weather Report – P. 49 text
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Describe daily weather
Be sure to include….. 1. Sky cover – clear, a few clouds, scattered clouds,
partly cloudy, mostly cloudy, overcast
2. Precipitation intensity – light moderate, heavy
3. precipitation measure – mm or cm – rain gauge
4. relative humidity - % - hygrometer ir sling psycrometer
Temperature – Celsius – thermometer
Wind direction – wind vane and compass points
Include definite digits and one estimated digit
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Forecasting the Weather
Short Range Forecast
A forecast that predicts how
weather conditions will change
over a 48 hour period
Usually more accurate
Look at location of weather fronts,
speed and directions
Look at pressure systems and
boundaries
Isotherms/isobars
Long Range Forecast
A weather forecast that predicts
how the weather will change over
a period of 3 to 7 days
Not as accurate – why??? P. 56
More computer bases statistical
analysis – computer models of
atmospheric circulation and
behaviours
Weather forecasts will vary to a certain degree of uncertainty!
Varies with how far it is predicted in the future
The atmosphere is unreliable and can change quickly
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P. 10
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What is an isotherm?
Isotherms are lines of constant or equal temperature.
They are often used on weather maps by meteorologists
to give a large scale view of temperatures across the U.S.
If you have ever looked at a weather map in a newspaper,
the isotherms are used to divide the color-filled
temperatures.
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What is an isobar?
Isobars are lines of constant or equal pressure on a
weather map. They can be used to find areas of low or
high pressure over a broad area (like the U.S.), and they
can tell us how intense the system may be. On weather
maps, you may have noticed areas that have a large “L”
or “H” over a region with lines circling around them. The
“L” stands for low pressure (where we would expect to find
the lowest pressure) and “H” stands for high pressure
(where we would expect to find the highest pressure). The
lines circling them are isobars. Generally the lowest
pressure is where precipitation is most likely to fall, and
high pressures are usually associated with clear and
sunny conditions. Where the isobars are close together,
windy conditions may be expected. Elongated areas of
low pressure on surface and upper air weather maps are
called "troughs" and elongated areas of high pressure are
called "ridges."
Closer together, stronger wind and low
pressure system
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https://www.theweathernetwork.com/ca/hourly-weather-
forecast/newfoundland-and-labrador/wabush
The weather network
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The dew point is the temperature the air needs to be
cooled to (at constant pressure) in order to achieve
a relative humidity (RH) of 100%. At this point the air
cannot hold anymore water in the gas form. If the air
were to be cooled even more, water vapor would
have to come out of the atmosphere in the liquid
form, usually as fog or precipitation.
The higher the dew point rises, the greater the
amount of moisture in the air. This directly effects how
"comfortable" it will feel outside.
General comfort levels that can be expected during
the summer months:
less than or equal to 55: dry and comfortable
between 55 and 65: becoming "sticky" with muggy
evenings
greater than or equal to 65: lots of moisture in the air,
becoming oppressive
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https://eldoradoweather.com/canada/weatherglance.html
The weather office
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https://eldoradoweather.com/satellite
/ssec/conus-us-composite/conus-
color-composite.php
Active satellite map
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Canadian Contributions to weather related technology
1. 3 cup anemometer
2. humidex scale
3. UV index
4. LIDAR – Mars Phoenix spacecraft P. 50 in textbook
5. Andre Robert – first computer bases simulations of weather patterns and forecasts
6. Canadian GEM forecasting global model
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Weather-related knowledge is not static – it changes with increased knowledge
and technological advances
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Climate Change – P. 68
Greenhouse gases—water vapor, carbon, methane, and
nitrous oxide—trap heat in our atmosphere. Those gases are
neither “good” nor “bad.” They are natural.
For more than a century, humans have been sending extra
greenhouse gases into our atmosphere, from industrial and
agricultural activities. We are tampering with the balance of
gases in our atmosphere. It is now trapping too much of the
sun’s heat, so that our planet cannot properly cool off. We’re
throwing the regulation mechanisms out of whack.
This has created global warming. Our average temperatures
are climbing steadily, and dangerously. This is such an
enormous change that it is almost impossible to believe. But
there is no disagreement among serious climate scientists. We
are changing our climate. And we are beginning to see,
feel—and suffer from—the results.
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Review Questions – P. 77-70