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marine-weather-mcp-server

Marine weather aggregator tool

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What's in it

Data offered docs-verified: marine alerts (e.g. Small Craft Advisory) · US coastal/Great Lakes zone wind and wave forecast · Offshore Forecast (OFF), ~60nm and beyond · High Seas Forecast (HSF) · NDBC buoy/station observations · NWS gridpoint hourly point forecast · Area Forecast Discussion (.MARINE section) · ECMWF vs GFS wind model comparison (Open-Meteo) · sunrise/transit/sunset, civil twilight and moon data · tide, water level and current predictions · charted Light List aids to navigation · navigation discrepancies (aid outages, hazards, temporary changes, marine events) · US Coast Pilot full-text search · active tropical cyclones (NHC) · Great Lakes ice cover percentage by lake · composite go/no-go route outlook · MetService/MetOcean point forecast (second source) · registry dump of ports, zones, stations and routes
Coverage docs-verified: United States (nationwide) for NWS/NOAA-based tools; named-port regions Lake Michigan west and Antigua & Barbuda; outside NWS coverage forecasts come from Open-Meteo
Update frequency docs-verified: On-demand live queries against upstream sources; no refresh interval documented
Formats docs-verified: Markdown · JSON
Access docs-verified: Local install (Python venv), GPL-3.0 licence. Forecast-only tools need no key. MetService/MetOcean tools need a free personal-tier API key via METSERVICE_API_KEY (console.metoceanapi.com); NWS_CONTACT should be set. Coast Pilot search needs a one-time index build with network access.

Useful for

Use cases llm-inferred: Go/no-go passage or survey-boat weather window check using marine_route_outlook · Tide and current predictions for a coastal or estuarine marine works window · Cross-checking NWS wind and wave forecasts against MetService or model data for marine construction or dredging planning · Harbour or outfall survey logistics using tides, Light List aids and navigation discrepancies
Audience llm-inferred: coastal engineers · marine survey planners · ecologists · hydrologists

Limitations

Constraints docs-verified: Not for navigation: a hobby-grade planning aid whose data may be late, incomplete or wrong · Go/no-go thresholds are personal drafts that must be edited to the user's own limits · Built around US sources: NWS/NOAA coverage, with Open-Meteo for areas outside NWS coverage; UK coverage is not documented · Tropical cyclone data covers Atlantic and Eastern-Central Pacific only · marine_search_coast_pilot needs a one-time ingest (~77MB, several minutes) and full rebuilds on each run · MetService tools return a 'not configured' message until METSERVICE_API_KEY is set · Some registered NDBC stations do not report, so 'no data' results occur · Claude Desktop needs the venv Python given as an absolute path, and the app must be fully restarted after config changes

Licence: GPL-3.0
Authentication: API key via env: METSERVICE_API_KEY (auto-extracted from README)
GitHub stars: 0
Last commit: 17/10/2026
Last successful page check: 14/10/2026
Page health: healthy
Package: Not recorded
Verification: Not independently verified

Auto-extracted, unverified fields: tools, install, auth. Check upstream documentation.

Provenance & evidence

Daily discovery 2026-10-18: GitHub search; verified via GitHub API. Tools/install/auth auto-extracted from README.

Metadata observed 14/10/2026 · daily-2026-10-18 (github-search)