Weather in Atlantic Canada

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Weather in Atlantic Canada

• Chapter 3

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Condensation

• Occurs when moist air rises and cools, forming
  clouds.
• Air rises because of being warmed from below
  (convectional condensation), meeting a colder and
  denser air mass (frontal condensation) or it may
  be blown over high ground. (orographic
  condensation)

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Wind

• Wind is air that is moving from an area of high
  pressure to an area of low pressure.
• An area of low pressure occurs when air above a
  warm surface is heated and rises.
• An area of high pressure forms when cool air
  sinks towards the surface, pushing the air
  underneath away.
• High winds can develop between areas of high and
  low pressure.

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Climate

• Average conditions of temperature, precipitation,
  humidity, air pressure and wind.
• Precipitation refers to rain and snow and other
  forms of water particles in the atmosphere
• Our climate is usually humid and relatively cool.
• Weather is the conditions of the atmosphere over
  a short period. Climate is weather averaged over
  a period of time.
• We have a Maritime climate!

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Atlantic Maritime - a maritime climate, with
temperatures moderated by the Atlantic Ocean, and
large amounts of precipitation.
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Air Masses

• Volumes of air with similar temperature and
  moisture conditions are air masses.
• Continental artic air feels cold and dry.
  Maritime tropical air feels warm and moist.
  Maritime polar air feels cool and moist.
• The leading edge of an air mass is called a
  front. Fronts bring the characteristics of the
  air masses that drive them and change the weather.

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Ocean Currents

• Currents move water from place to place. There
  are two ocean currents that greatly affect our
  climate.
• The Gulf Stream, an ocean current originating in
  the gulf of Mexico, brings warmth to our waters,
  while warming and bringing moisture to the air
  masses above it.
• The Labrador Current brings cold to our waters
  while cooling and bringing moisture to the air
  above it.
• Water has a moderating effect.cooler in summer,
  warmer in winter.

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Fog

• Fog occurs when water vapour forms in air with
  particles that are too small to fall as rain and
  remain suspended in slow moving air.

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Meteorologist

• Weather expert who studies conditions in the
  atmosphere for the purpose of making weather
  forecasts.
• Weather radar stations are especially useful in
  detecting. Locating and measuring the amount of
  precipitation in clouds.
• Satellite imaging is very useful in making
  weather forecasts.
• A Radiosonde is a piece of equipment carried into
  the atmosphere by a small balloon in order to
  collect information about the upper atmosphere.

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Cindy Day - Meteorologist
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Discussion questions

• Page 41, 1. a, b and c
• Page 42, 1. a and b