East Coast Swell Alert – December 2, 2013

3 Dec 2013 2 Share

East Coast Swell Alert December 2 – 3, 2013. By Ben Macartney

- Strong increase in mid period E groundswell underway throughout Tuesday (today).

- The episode peaks on Tuesday afternoon in the four to six foot range.

-  Swell hangs in at solid four to five foot levels on Wednesday morning before gradually easing

The low reached a peak intensity of 1001 hPa on Monday night before gradually filling throughout Tuesday morning. Source: BOM.

The low reached a peak intensity of 1001 hPa on Monday night before gradually filling throughout Tuesday morning. Source: BOM.

As far as swell alerts go this one is last minute, but if you reside on Australia’s East Coast it’s worthy of your attention. Over the last few days a hybrid low developing over the Tasman Sea gradually deepened, setting up a low end gale force ESE fetch in conjunction with a cradling high to the south; situated within relatively close range of Eastern Seaboard. The low has remained slow moving - roughly positioned 500 nautical miles off the far northern NSW throughout Sunday and Monday. Although wind speeds associated with the storm are not overly strong (mostly 25 to 35 knots), the slow movement of the low facilitated steady wave growth over the central Tasman Sea over the last 48 hours, producing a maximum significant wave heights of t 15 feet plus over the central Tasman Sea on Monday night.

A subsequent mid period E groundswell was already beginning to show across the region on Tuesday morning, with reports of an increase to four to five feet across Newcastle and clean three to four foot lines showing across Sydney’s Northern Beaches by 9.30am. The swell should continue to build across Sydney and surrounds towards four to six feet throughout Tuesday afternoon under strengthening NNE winds. The South Coast will experience a comparatively diluted pulse of E swell, given locations further south lie further out of range of the swell source. Expect a continuation of mid to large E swell early on Wednesday, with wave heights steadily easing throughout the day.

This image depicts peak wave period, showing the leading edge of the groundswell making landfall at 10 to 12 second intervals on Tuesday morning.

This image depicts peak wave period, showing the leading edge of the groundswell making landfall at 10 to 12 second intervals on Tuesday morning.

Although latest computer modelled projections only pick up a six foot deepwater swell arising from the system, the easterly direction and strong wave periods facilitate large surf as this episode peaks late Tuesday/ early Wednesday.

Although latest computer modelled projections only pick up a six foot deepwater swell arising from the system, the easterly direction and strong wave periods facilitate large surf as this episode peaks late Tuesday/ early Wednesday.


Tags: swell alert , east coast (create Alert from these tags)

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