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Weather/Climate (WEATHER current state of atmosphere (measure (maximum…
Weather/Climate
WEATHER
current state of atmosphere
measure
Stevenson screen
white louvered wooden box
white to reflect sunlight
stat to allow easy air circulation
contain weather equipment: thermometers and barometers
air enters and leaves via Lourdes
take accurate readings of the air, rather than direct sunlight or heat from the ground or from buildings
Barometor
measure air pressure in millibars
high pressure system -anticyclone-
maximum-minimum thermometer
contains mercury/ alcohol
when
when temp falls
rain gauge
measure rainfall
placed on grass
not on concrete as more water
regularly checked to avoid evaporation
wind vaine
measure wind direction
compass point gives direction which winds travel from
on top of building-> full exposure to wind
Anemometer
Anemometer
measure wind speed
on top of building-> exposed to wind/ unprotected
Air falls in an anticyclone so no clouds are formed. In summer, high pressure usually results in clear skies, gentle breezes and fine weather. In winter high pressure leads to clear skies and colder conditions.
An area of low pressure is called a depression. Air rises in a depression so clouds and rainfall are formed. Depressions therefore bring unsettled weather and rain. Winds are normally stronger. They usually form over the Atlantic Ocean and are carried across Britain by westerly winds.
clouds
low clouds
water droplets
base below 2000m
medium clouds
water droplet + ice crystals
base between 2000 - 7000m
high clouds
ice crystals
base between 5500 - 14000