uk es it fr pt nl
Winthrop Jetty ratings
Quality on a good day: 2.3
Consistency of Surf: 2.0
Difficulty Level: 2.8
Wind and Kite Surfing: 1.2
Crowds: 2.4

Overall: 2.0

See all 18 ratings

Based on 25 votes. Vote


Surf Report Feed

Winthrop Jetty Swell Statistics, October: All Swell – Any Wind

This chart illustrates the combination of swells directed at Winthrop Jetty over a normal October and is based upon 2975 NWW3 model predictions since 2006 (values every 3 hours). The wave model does not forecast wind or surf right at the coastline so we have chosen the optimum grid node based on what we know about Winthrop Jetty, and at Winthrop Jetty the best grid node is 41 km away (25 miles).

The rose diagram describes the distribution of swell directions and swell sizes, while the graph at the bottom shows the same thing without direction information. Five colours represent increasing wave sizes. Very small swells of less than 0.5m (1.5 feet) high are shown in blue. These occurred 42% of the time. Green and yellow show increasing swell sizes and red shows the largest swells, greater than >3m (>10ft). In either graph, the area of any colour is proportional to how commonly that size swell happens.

The diagram implies that the most common swell direction, shown by the largest spokes, was E, whereas the the most common wind blows from the W. Because the wave model grid is out to sea, sometimes a strong offshore wind blows largest waves away from Winthrop Jetty and offshore. We combine these with the no surf category of the bar chart. To avoid confusion we don't show these in the rose diagram. Because wind determines whether or not waves are clean enough to surf at Winthrop Jetty, you can select a similar diagram that shows only the swells that were expected to coincide with glassy or offshore wind conditions. During a typical October, swells large enough to cause surfable waves at Winthrop Jetty run for about 58% of the time.

IMPORTANT: Beta version feature! Swell heights are open water values from NWW3. There is no attempt to model near-shore effects. Coastal wave heights will generally be less, especially if the break does not have unobstructed exposure to the open ocean.