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Regional Weather and Precipitation by mrpretty

VIEWS: 30 PAGES: 14

									Regional
Weather and
Precipitation
   14.4-14.5 pgs.
   553-557
                Thermals




 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)
Thermals
               Thermals




 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
                 Thermals




 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
  Mountains.

 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
              Precipitation

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




 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
             Precipitation




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




 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
                   Precipitation




 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
             Precipitation




 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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