What are 'atmospheric rivers'? Discuss their impact on regional climate and human settlement.

Atmospheric rivers are narrow streams of maiderin in clouds that carry substantial amount of water in them like the famous pineapple express. Impact on regional climate: 1) Leads to moderation of temperature key rainfall. 2) Causes humidity in the atmosphere. 3) Could cause concentrated rainfall leading to cloudbursts. Impact on human settlement: 1) Could cause mass destruction due to torrential rains. 2) Leads to loss of life and damage to property. 3) In moderate amounts, it avails aquifers and alluvials brought like situations.