Show HN: Griblet – Free browser-based GRIB file viewer

I sail and was tired of the tooling around GRIB files. GRIB is the binary format for weather forecasts (what NOAA/GFS publishes). If you want to view one, your options are: install a desktop app like XyGrib or OpenCPN, pay for a service, or wrestle with command-line tools.

I wanted something I could just open in a browser—drop a file, see wind on a map. Couldn't find it, so I built it: griblet.app

It parses the GRIB, extracts wind vectors, and renders them as animated particles over Leaflet. Supports multi-timestep files so you can scrub through the forecast. No signup, nothing stored server-side (files are parsed in memory and discarded). I'm planning to add more layers in addition to visualizing the wind.

Also added a Saildocs request builder because getting GRIB files can be a challenge. Saildocs is a free service for fetching weather via email—useful offshore where your only connectivity is satellite or SSB radio. You email a specially formatted request, it replies with a GRIB attachment that can be uploaded to giblet. The builder just helps you compose that request correctly.

Would appreciate feedback, bug reports, or feature ideas.