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Regional Weather and Precipitation by mrpretty


Weather and
   14.4-14.5 pgs.

 A local convection current set up during the day
  is called a thermal or thermal updraft (usually
  weak in the morning, strong in the afternoon)

 Sea Breezes are caused when a thermal forms
  near a sea, an ocean, or lake.

 Solar energy warms the land faster than the
  water-and the water provides cool air

 Land Breezes form when the land cools more
  quickly than the water

 The air above the water rises and is replaced by
  cooler air from above the land

 As a result, a convection thermal flows from the
  land to the water
                Lake-Effect Snow

 An air mass moves across a large body of water and picks
  up moisture

 When the moisture laden air mass warms and rises as it
  travels across the water where the temperature is lower the
  moisture becomes snow
                Chinook Winds

 Chinook Winds are warm,
  dry winds in the Rocky

 Westside of the mountains
  is the windward side
                 Chinook Winds

 Eastside is warmer and dryer

 Orographic lifting causes water to condense-this releases
  heat warming the air

 Drizzle: Fine water
  droplets between
  40 μm and 0.5 mm
  in diameter-like
  rain, may be light,
  moderate or heavy

 Rain: Made up of falling water droplets between
  0.5 mm -5 mm in diameter. If a larger drop forms-
  it breaks into pieces as it falls

 Freezing Rain: Raindrops are close to freezing
  and strike a cold object on/or near the ground-
  the drops freeze almost instantly

 Snow: Forms when water vapour crystallizes on
  tiny particles of dust and other solid substances
  such as smoke. Forms when air temperature and
  water vapour has cooled to 0o C

 Hail: is a solid form of water created in cumulonimbus clouds
  high in the troposphere. Frozen rain drops move up and down
  in highly active thunderclouds. Hailstones grow larger each
  time an updraft raises them through cold water droplets at
  high altitude

 Dew: Air cools and the water vapour condenses
  on a cool surface near the ground. If the surface
  is very cold the water vapour deposits frost.

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