Green Ball
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Hourly Forecast
Timezone: Asia/Makassar
⏱️s.
⚡️kJ
Thursday 28
Friday 29
Saturday 30
Sunday 31
Monday 01
Tuesday 02
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Green Ball surf guide

Green Ball is a surf spot located on the southern coast of Bali. It's known for its challenging conditions and requires a bit of effort to get there, with a long hike down a steep cliff path. The place can get crowded, especially during the early morning when conditions are at their best. Surfers looking for a solid right-hand wave will find this spot to have potential, though you’ll need to pick your moments wisely.

The waves at Green Ball generally come in from the South and West, making the optimal swell direction from the Southwest. It handles swell sizes around 2-6 feet (0.6-1.8 meters), which can really pack a punch, especially when it breaks over the live coral. You can expect fast, punchy rights that wall up well before breaking over the reef. The best conditions usually occur with a NorthWest wind and during mid tide. It’s a good spot for intermediate surfers, but be aware that the strong currents can be tricky and might catch you off guard if you’re not paying attention.

Make sure to stay aware of the current situation, as Green Ball is known for having one of the strongest currents in Bali, which sweeps out to sea at different angles. It can be hard to stay in position, and those goofy-footers thinking of trying the left will want to think twice due to the rip and reef. If you find it too crowded, you might want to explore other nearby spots after checking out Green Ball.

Surf reports and surf forecasts nearby Green Ball

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Green Ball
Unknown Region, Unknown Country
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Thu 28
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"Great Forecasts. Nothing more, nothing less."

Readme

Welcome! If you’re new to surf forecasting, check out this quick guide.

Forecast Table

The forecast table (the section on the page with all the numbers) is designed to pack as much information in the screen as possible. Although intimidating at first, it will help you make informed decisions about the waves faster, trust me :D. The table consists of roughly four sections, time and predictions, wind, waves, and tides:

🔮 Time and predictions section

Here we show the forecast thour and the overall surf quality prediction. This is determined based on the wave, wind and tide quality prediction. These individual predictions can be found on the forecast map.

💨 Wind section

The first row on the table (with the 💨 icon) shows wind speed, direction and gust. The more the wind speed the more aggressive the color (from blue, green, orange to red).

🌊 Wave section

The waves section consists of three rows, one for wave height and direction, one for period and one for wave energy. Our algorithm choices the "dominant wave". This is normally the first swell partition, but with heavy local storms it displays the wind waves. If that's the case, we display the numbers in italic and in gray.

🌒 Tide section

The tide section consists of a row with the actual heights per hour (measured at the half hour) and a table that displays the flow of the tide and the extremes (lows and highs).

Forecast map

The forecast map consists of arrows. These arrows represent all wave partitions (swell partitions and wind wave partition) and the wind. This allows you to see things like: a secondary swell or wind waves messes up the surf, or the wind is just a tick offshore so very surfable. Click a metric label in the bottom left to bring that arrow to the front — handy when arrows overlap.

Forecast Cheat Sheet

Short on time? Focus on wave energy. It’s the best single metric to gauge how big and powerful the waves will be.

Click any table cell to jump to that forecast hour. The map will update with forecast arrows, so you can see if wind and swell direction are lining up.

Use the table sidebar to switch units for height and speed.

Log your surf sessions to compare forecasts with real sessions and sharpen future predictions.

Models and Updates

Surfnerd blends multiple global and local wind and swell models using advanced interpolation and spatial techniques to create an "ensemble" forecast. Forecasts are refreshed hourly.

Surf Predictions

Our AI-driven algorithm scores surf quality, shown by green, orange, and gray dots. Each forecast hour is rated for wind, swell, and tide quality, then combined into an overall score. Here’s the scale:

Perfect
Good
Average
Bad or No Data

Session logs also feed the algorithm — the more you log, the smarter your forecasts get.

With Surfnerd, no more "you should have been here yesterday"

Wind certainty

Wind certainty tells you how much the weather models agree on the forecast.

  • High certainty: Models agree closely; forecast is reliable.
  • Medium certainty: Some disagreement; conditions may shift slightly.
  • Low certainty: Models diverge; treat forecast with caution.

We calculate this by comparing wind speed, gust and direction from multiple models (like GFS, ECMWF, Arome, and Harmonie) and seeing how closely they match. They are weighted, meaning that some models count more than others, depending on how good they are for a certain spot.

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