** Dangerous and life-threatening flash flooding for the NSW Coast **Torrential rain is likely over parts of the New South Wales coast over the next few days, with warnings for dangerous and life-threatening flash flooding and moderate to major riverine flooding in some areas.A coastal trough is generating widespread rain across central east and northeast NSW today, with more than 100mm already falling in the Kempsey region since 9am today (to 2pm EDT). Heavy rainfall will continue today and into Friday and Saturday, with a low pressure system set to form within the trough and track south down the coast.Warnings have been issued by the Bureau of Meteorology warning for dangerous and life-threatening flash flooding over the Mid North coast and northern Hunter districts, particularly from Friday when the low forms. Widespread falls of 100-200mm are likely over the next 48 hours in these regions, with some areas possibly seeing in excess of 400mm. With coastal catchments already saturated, this is likely to push many areas into moderate flood, and some catchments into major flood.