East to southeasterly 10/15 knots becoming variable about 10 knots in the morning then becoming southerly 10/15 knots in the afternoon and reaching 20 knots in the evening. Seas: Around 1 metre, increasing to 1/1.5 metres offshore by early evening. Swell: Southwesterly around 1 metre, increasing to 1/1.5 metres offshore. Outlook Saturday: Variable about 10 knots becoming southwesterly 10/15 knots in the middle of the day then tending southerly 15/20 knots in the early afternoon. Seas: Below 1 metre, increasing to 1/1.5 metres during the afternoon. Swell: Southwesterly 1/1.5 metres, increasing to 1/2 metres, then decreasing to 1/1.5 metres by early evening. Outlook Sunday: Southerly 15/20 knots. Seas: 1/1.5 metres. Swell: Southwesterly 1/2 metres, decreasing to 1/1.5 metres during the morning.Issued Fri 04:00 WST
15:34 EDT It's not easy to get a sense of just how powerful a typhoon, cyclone or tornado will be.