Massive swells in Seaside Heights. Waves that forced two beaches to close in Ventnor. And several rescues in Manasquan. The Jersey Shore is feeling the effects of Hurricane Ernesto — with rip currents making for dangerous conditions throughout the coast and all of New Jersey bracing for rain showers and strong thunderstorms over the weekend. The National Weather Service warned Saturday of scattered downpours through the evening with localized flooding and damaging winds possible Sunday. Forecasters previously said they expected rip currents at popular Delaware and New Jersey beaches over the w…