Marine Weather Grounding Data

Overview

Marine Weather works by retrieving the marine weather data from various reliable weather sources and providing it in a structured format. You can expect accurate and up-to-date information.

Live Test Marine Weather Grounding Data Source →

The tool

Once your client is connected to the VerveContext server, this appears in its tool list as MarineWeatherGroundingData. It is read-only and open-world — it fetches and never mutates anything on your side — so most clients call it without asking you to confirm.

{
  "name": "MarineWeatherGroundingData",
  "arguments": {
    "lat": "29.48003",
    "lon": "-37.62424"
  }
}

You do not name the tool yourself; the model picks it. Asking about 29.48003 in the terms this source covers is enough for it to reach for MarineWeatherGroundingData on its own — naming it explicitly also works, and is the way to force the call.

Connecting

One server URL covers every source in the catalog, including this one. Authorization is OAuth: the client opens a browser once, and there is no key to paste into a config file.

{
  "mcpServers": {
    "vervecontext": {
      "url": "https://api.vervecontext.com/v1/mcp"
    }
  }
}

https://api.vervecontext.com/v1/mcp

Per-client setup — Claude, Cursor, VS Code, ChatGPT — is on the MCP setup page.

Arguments

These are the properties on the tool's inputSchema, so a well-behaved client validates them before the call is made. Premium arguments are accepted on every plan but only take effect on plans that include them.

What the model gets back

The result carries a structuredContent object matching the tool's declared outputSchema, so a client reads fields without parsing prose. status is "ok" and error is null on success; a null field means the value was not available for that input, not that the call failed.

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{
  "status": "ok",
  "error": null,
  "data": {
    "location": {
      "lat": 29.48003,
      "lon": -37.62424
    },
    "weather": {
      "date": "2026-09-17",
      "avghumidity": 86,
      "condition": "Moderate or heavy rain shower",
      "uv": 5,
      "sunrise": "05:53 AM",
      "sunset": "06:08 PM",
      "moonrise": "12:04 PM",
      "moonset": "10:42 PM",
      "maxtempc": 25.9,
      "maxtempf": 78.6,
      "mintempc": 21.3,
      "mintempf": 70.3,
      "avgtempc": 24.9,
      "avgtempf": 76.8,
      "maxwindmph": 15.4,
      "maxwindkph": 24.7,
      "totalprecipmm": 14.89,
      "totalprecipin": 0.59,
      "totalsnowcm": 0,
      "avgviskm": 7.4,
      "avgvismiles": 4,
      "moonphase": "First Quarter",
      "moonillumination": 42
    }
  }
}

Response fields

Paths are relative to data. Premium fields are absent rather than zeroed on plans that do not include them, so check for presence instead of comparing to 0.

Why ground on it

A model can produce something that looks like this answer from its training data, and be confidently out of date or simply wrong. This source returns the current value in a shape you can check, which is the difference between an answer you can cite and one you have to hedge.

Point an evaluation at location.lat: it is the field most worth pinning a claim to, and it is either present and current or absent — never plausibly invented.

Failure modes

Errors come back as tool errors carrying a sentence the model can act on, not a bare status code. Error handling covers the full list.

A call costs 10 credits each time the tool actually runs; a model that reasons about the tool without calling it costs nothing.

Use cases

Voyage Route Planning

Commercial shipping dispatchers evaluate maximum wind speeds and precipitation totals along projected corridors to steer vessels away from rough open-sea conditions.

Offshore Fishing Charters

To protect offshore anglers, booking platforms check marine weather conditions, humidity levels, and UV indices before confirming deep-sea reservations.

Regatta Safety Monitoring

When organizing coastal sailing competitions, race committees monitor wind thresholds and precipitation to schedule offshore heats during safe operating windows.

Port Logistics Scheduling

Cargo terminal coordinators track offshore forecast conditions and daylight hours to prepare docking tugs and crane crews for inbound container vessels.

Other ways to use Marine Weather Grounding Data

Set up Marine Weather Grounding Data on VerveContext, or reach the same source a different way. Your VerveContext account and credits work on all of them — one key, one balance.

Related

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