Friday: Northeasterly 15/20 knots, reaching up to 25 knots offshore in the evening. Seas: Around 1 metre, increasing to 1.5/2 metres during the afternoon. Swell: Easterly below 1 metre. Weather: The chance of thunderstorms south of Port Stephens during the late afternoon and evening. Saturday: Northerly 15/20 knots shifting south to southeasterly in the morning. Winds reaching up to 25 knots offshore north of Port Stephens early in the morning. Seas: 1.5/2 metres, decreasing below 1.5 metres during the morning, increasing to 1/2 metres offshore south of Norah Head around midday. Swell: Easterly around 1 metre. Weather: The chance of thunderstorms south of Norah Head from the early morning, extending throughout from the late morning. Outlook Sunday: South to southeasterly 10/15 knots tending east to southeasterly below 10 knots during the afternoon. Seas: Around 1 metre. Swell: Easterly below 1 metre.Issued Fri 10:23 EDT
15:05 EDT It's not easy to get a sense of just how powerful a typhoon, cyclone or tornado will be.