Rainfall

Rainfall

1. Convectional

   • heavy rain from pervious storm means ground is wet
     • ground is warmed from the sun
       • the moisture from the ground is evaporated and rises with the warm air
         • the firther away from the ground the colder the temperature
           • because it is starting to become colder the water condenses
             • precipitation is released
   • convectional rainfall is most common in the tropics

2. Relief

   • when warm winds are blown in from the sea carrying heavy moisture
     • warm saturated air travels over a coastal mountain barrier
       • air has to rise over this higher area and so will cool and condense forming rain

3. Frontal

   • when warm air carried from the tropics meets cold air carried from the polar regions
     • warmer saturated but lighter air rises over the cold air
       • as it does it is cooled and eventually the dew point is reached and the moisture condenses
         • precipitation is released

4. three types: Convectional, Frontal, Relief

5. how it works:

   • Warm air on the ground causes water to evaporate
     • warm air and water vapour is forced to rise
       • as it rises the air/watervapour cools
         • water vapour begins to condense due to cool air, condenses to minute water droplets (clouds)
           • if cooling continues increase in size of water droplets will cause rain

6. prevailing south westerly winds bring a lot of relief rainfall to england