A deep low pressure system has sent a wintry blast over southwest WA and has also generated some massive waves along parts of the southern and southwestern coasts. On Saturday the deep low moved over the Leeuwin and Albany Coasts sending rain, gusty winds and massive waves onto the coastline. The largest waves recorded were along the Leeuwin Coast where significant wave heights reached 6.5 metres, and 6 metres along the Albany Coast. On Sunday morning the low had started moving east of Albany. Wave heights are forecast to be slightly lower than Saturday however the southerly to southwesterly swell is expected to reach 4-6 metres along the Leeuwin and Albany coasts and offshore along the Bunbury Geographe Coast. Perth will be somewhat protected from the biggest of the waves however a 3-5 metre swell is expected offshore with 2-3 metres likely for the Perth Local Waters. On Monday the low will weaken as is continues to move eastwards into the Great Australian Bight. This will allow wave heights to gradually ease through the day and even further on Tuesday when a 2-3 metre swell is expected. A cold front will bring another increase in winds and wave heights on Wednesday however heights won't reach those experienced this weekend.