# Whitby Cod Call Forecast

> Server-rendered surf forecast for Whitby, North Yorkshire, UK. Live data from CMEMS AMM15, EWAM, GFS Wave and the Channel Coastal Observatory Whitby 109 buoy.

## Forecast

- [Today's swell, wind and stars](https://test.codcall.foo/): 16-day forecast with hourly swell height, period, direction, wind state, tide times and a star rating
- [Site comparison between CMEMS AMM15, GFS Wave, EWAM and the Whitby 109 buoy](https://test.codcall.foo/): each hour's primary swell is the better of CMEMS AMM15 and EWAM at the beach; GFS Wave contributes secondary swell and wind wave; the live buoy reading is shown alongside as a verification cell

## Data sources

- **CMEMS NWSHELF_ANALYSISFORECAST_WAV_004_014** (Copernicus Marine AMM15 1.5 km wave model) — primary wave height / period / direction
- **DWD EWAM 5 km** (Open-Meteo Marine) — high-resolution coastal swell
- **NCEP GFS Wave 0.25°** (Open-Meteo Marine) — long-range swell and wind wave
- **Open-Meteo Wind** (ECMWF base + DWD ICON-D2 2 km override) — wind state
- **Channel Coastal Observatory Whitby 109** — live surface buoy readings (Hs, Hmax, Tpeak, PeakDir)
- **tidetime.org** — high/low tide times for Whitby pier

## Changelog

- **2026-10-07** — fixed binary asset corruption (added `binary_media_types` to API Gateway, base64-encode Lambda responses); SVG removed from favicon set to avoid neon-green tab icon; Cache-Control now `max-age=60, stale-while-revalidate=300`
- **2026-10-06** — CMEMS fetcher migrated from `timeChunked` (432 HTTP calls / 375 MB) to `geoChunked` (9 HTTP calls / 7.6 MB); 7-day forecast horizon; swell filter period floor 10 s
- **2026-09-26** — blosc2 decompression rewritten to use `libblosc2` via CGo; sync.Pass / seven days of CGo decompressor buffers
- **2026-08** — repo split into multiple Go files; CI/CD via GitLab

## Source

- Source code: https://gitlab.com/marrax/codcall (Go, html/template, embedded assets, CGo blosc2)
- Issue tracker: same GitLab project

## Optional

- [robots.txt](https://test.codcall.foo/robots.txt)
- [AI catalog (ai-catalog.json)](https://test.codcall.foo/ai-catalog.json)
- [PWA manifest](https://test.codcall.foo/site.webmanifest)