In general, when will clouds begin to form out of a parcel of air?
1) when a rising parcel of air has reached a temperature above its Lifting Condensation Level
2) when a rising parcel of air has reached a temperature above its dew point
3) when a rising parcel of air has reached a temperature below its Lifting Condensation Level
4) when a rising parcel of air has reached a temperature below its dew point
