SOUTHERN OCEAN SWELL ALERT: 24 September 2013

24 Sep 2013 0 Share

Swell Alert Issued 24th September 2013 by Ben Macartney.

- Heavy WSW swell and strong onshore winds continue to impact the Margaret River region all week.

- A series of strong SSW groundswells travel north to affect Indonesia, maintaining days of large surf in the six-to-ten foot range.

- Victoria and South Australia receive a sustained run of large WSW swell lasting through to the end of September.

- The NSW coast benefits from a series of mid range S pulses on Friday and over the weekend.

- New Zealand’s west coast receives a series of large WSW swells through late September/early October.

Latest Wave Tracker model runs show a succession of heavy WSW swells aimed at the West Coast this week.

Latest Wave Tracker model runs show a succession of heavy WSW swells aimed at the West Coast this week.

Western Australia

Recent surf reports coming out of Margaret River haven’t exactly been indicative of Spring. Since Tuesday last week the surf hasn’t dropped below 8ft+ and there have been several days of heavy 12 to 15 foot storm swell; mostly recently on Monday 23 and Tuesday 24 September. This heightened wave activity is linked to the slow passage of a broad low pressure complex through Western Australian longitudes, characterised by a series of vigorous low pressure systems tracking east north-east across the south-east Indian Ocean, towards south-western Australia.

Source: BOM. Monday's weather map depicts the highly active storm track affecting the West Coast - the repercussions of which reverberate across coastlines as distant as Indonesia and New Zealand later in the week.

Source: BOM. Monday's weather map depicts the highly active storm track affecting the West Coast - the repercussions of which reverberate across coastlines as distant as Indonesia and New Zealand later in the week.

Indonesia

Although the close proximity of the storm system to the West Coast ensures any quality surf is unlikely across the Margaret River region, locations further afield will benefit aplenty – particularly Indonesia. As the winter tradewind regime dies off to low strengths of five to ten knots, Islands like Bali, Java, Lombok and Sumbawa receive a series of overlapping SSW groundswells, producing days of clean, overhead to triple overhead surf across the Archipelago throughout the final week of September. Check the detailed Indo forecast for more on this.

Victoria & South Australia

The storm track aims back to back pulses of directional WSW groundswell at Victorian and South Australian coasts this week following the slow passage of the low pressure complex through West Australian longitudes. While this sees large WSW swell ranging from eight to ten feet across Victoria’s exposed beaches from Thursday to Saturday, an acute westerly bias in swell direction of 250 to 260 degrees will constrain refraction of the swell both along South Australia’s southern coastline and Victoria’s Surf Coast; limiting wave heights to three to six feet depending on location.

NSW

While the East Coast remains well and truly out of range of this activity, the gradual eastward migration of the complex low below the continent over the next few days exposed the region to a vigorous frontal low spinning off the storm track, moving across Bass Strait to develop east of Tasmania on Thursday. This holds good potential for a mid range spike in S swell across Sydney and surrounds on Friday and Saturday. Check the latest forecast for further details.

Latest Wave Tracker projections pick up a gale force WSW fetch developing out of Bass Strait on Thursday, resulting in a spike in S swell across the southern half of the NSW coast on Friday.

Latest Wave Tracker projections pick up a gale force WSW fetch developing out of Bass Strait on Thursday, resulting in a spike in S swell across the southern half of the NSW coast on Friday.

As the low tracks across the southern Tasman Sea on Friday it continues to intensify, setting up a  sustained run of small to mid range SSE swell for the NSW coast this weekend.

As the low tracks across the southern Tasman Sea on Friday it continues to intensify, setting up a sustained run of small to mid range SSE swell for the NSW coast this weekend.


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