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Building an Open-Source NOAA MRMS Radar Renderer in Python

When I started building Weather Experience , I wasn't planning to release an open-source project. I simply wanted to answer a question: Could I build a modern radar rendering pipeline using NOAA's publicly available MRMS data? That question led me down a rabbit hole of GRIB2 decoding, radar products, rendering pipelines, performance benchmarking, and ultimately the release of MRMS Renderer , the first open-source project from Taylor Creative Development. Why MRMS? NOAA's Multi-Radar/Multi-Sensor (MRMS) system provides an incredible amount of weather data. For my use case, I focused on the ReflectivityAtLowestAltitude product because it provides an excellent foundation for radar visualization. The challenge wasn't obtaining the data. The challenge was turning that data into something useful. The Pipeline MRMS Renderer performs the complete workflow: Discover the latest MRMS products directly from NOAA/NCEP Download and decompress GRIB2 data Decode the grid using ecCodes Process reflectivity values with NumPy Render transparent PNG radar frames Generate an animation manifest Display animated radar over OpenStreetMap using Leaflet Everything runs locally. The project intentionally does not provide a hosted radar service. Instead, it demonstrates how developers can work directly with NOAA's publicly available data. Performance One of the biggest questions I had at the beginning was performance. Could this realistically be done fast enough for a modern application? Rather than speculate, I wrote benchmarks. On my M4 Pro MacBook Pro over a standard Wi-Fi connection, the complete pipeline—from downloading the latest MRMS frame through rendering the finished PNG—consistently completed in around two seconds . The surprising result wasn't the renderer. The renderer itself was already highly optimized using NumPy vectorization. The largest source of latency turned out to be downloading the GRIB2 data itself. That finding helped shape later architectural decisions for Weather E

2026-08-09 原文 →
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Why generic weather MCPs fail for marine navigation (use NDBC buoys)

We run a prime directive on this stack: if a usable tool already exists, improve it; build our own only as a last resort, and when you keep your own, record why each alternative failed. This post is that audit for weather-mcp — a marine-weather MCP server — against the weather-MCP ecosystem, and the one capability change that fell out of it. The short version: three perfectly good weather MCP servers exist, and none of them does the thing a navigator actually needs. The reasons generalize to any "adopt an MCP server or keep your own" call, so the audit is the post. Then the fix — parsing a second NDBC file format to split swell from wind waves — is small enough to paste in full, and it surfaced data the standard file had thrown away. The problem, as you'd search it You want an agent to answer "what are the seas doing where we are?" and you go looking for a marine weather MCP. You find a few. Each one returns a forecast . None of them returns what a buoy 12 nautical miles away is measuring right now . That gap — forecast vs. observed — is the entire job, and it's the one thing the ecosystem skips. Here's what's on the shelf, and what each one is missing for marine use. The candidates Three real servers, all worth your time for what they're built for: cmer81/open-meteo-mcp ~13 tools, raw Open-Meteo JSON straight through weather-mcp/weather-mcp ~12 tools, own format, global; marine = Open-Meteo RyanCardin15/NOAA-Tides... CO-OPS stations: water levels + currents, not buoys And ours: sailingnaturali/weather-mcp 4 tools, Python, 2 runtime deps (httpx + mcp) get_marine_forecast Open-Meteo wind/swell/wind-wave/seas/pressure get_marine_forecast_premium Stormglass blend — 10 tokens/UTC-day, cache hits free get_nearest_buoy_observations NDBC observed wind + waves by lat/lon, with bearing + age get_stormglass_quota_status token-ledger read, no network Mapped against what a navigator needs: Capability ours open-meteo-mcp weather-mcp/weather-mcp NOAA-Tides Open-Meteo marine (swel

2026-06-24 原文 →