Strong thunderstorms packing gusty winds have knocked out power to thousands of homes and businesses in New Jersey Tuesday. NJ.com’s Power Outage Tracker, which monitors outage numbers from the four major utility companies in the state, showed more than 19,300 utility customers across the Garden State without power as of 6:50 p.m. The biggest clusters of outages Tuesday evening were reported in Ocean, Monmouth, Somerset, Hunterdon and Essex counties. A severe thunderstorm watch remains in effect until 11 p.m. in 17 New Jersey counties, and a flood watch is active across most of the state throu…