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5 Cards in this Set
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what is RH? |
> amt of water vapour in the air > ratio btwn amt of water vapour present in a mass of air and MAX the air can hold |
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what affects RH? |
> temp - higher temps hold more water vapour > amt of water vapour in the air |
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what is the relationship between temp and RH |
1. warm air can hold more water vapour than cold air 2. as temp increases, capacity of air to hold water vapour increases 3. when temp increases, amt of water vapour stays same, RH decreases 4. since RH is the ratio of actual amt of water vapour in the air over the max amt of water vapour the air can hold at a given temp, temp affects RH |
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describe the process of convectional rainfall |
1. incoming SWR absorbed by the earth’s surface 2. LWR emitted by surface 3. air is warmed by heated surface, air expands and rises 4. air cools to dew point temp, condensation takes place 5. clouds form, becomes heavy and falls as rain |
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describe the process of relief rain |
1. prevailing wind travels over sea, air picks up moisture 2. warmed moist air forces to rise by prevailing wind 3. air cools to dew point temperature, RH 100% 4. condensation occurs, clouds form, gets heavy and falls as rain |
