Residents of eastern NSW are advised not to remove their umbrellas from beside their front doors just yet, as more rain is set to descend on coastal towns over the next week. Showers will increase along northern shores and adjacent inland locations tomorrow as cool air aloft strengthens a surface trough in the Tasman Sea. Much heavier falls will arrive on Thursday, with 40 to 100 mm expected to splash the area between Port Macquarie and Yamba. Northern suburbs of Sydney are likely to receive a portion of this too, although not quite so high. On Friday there is a good chance that a low will form just off the coast, sending shower upon shower over the Mid-North Coast and Hunter districts. This will be the second consecutive day of large falls, increasing the likelihood of flooding. Gale force winds or stronger are also likely, which means wind speeds between 40 and 70 km/h. Saturday should see showers ease along the coast, although this reprieve will only be brief. Colder, gustier southerly winds will push through during Sunday, resulting in lines of showers for coastal suburbs of Sydney. For Newcastle, the rainfall totals over Sunday and Monday could be in excess of 50 mm.