> For clean Markdown of any page, append .md to the page URL.
> For a complete documentation index, see https://docs.silurian.ai/api-reference/cyclones/forecasts/cone/llms.txt.
> For AI client integration (Claude Code, Cursor, etc.), connect to the MCP server at https://docs.silurian.ai/_mcp/server.

# Get Forecast Cone

GET https://earth.weather.silurian.ai/api/v1/cyclones/forecasts/{storm_id}/cone

Get cyclone forecast cone in GeoJSON format

Reference: https://docs.silurian.ai/api-reference/cyclones/forecasts/cone

## Authentication

- `X-API-KEY` header (required) — API Key authentication via header

## Request

### Path parameters

- `storm_id` (string, required)

### Query parameters

- `time` (datetime, optional) — *Default value: (current time) - Default time zone: UTC*
- `max_lead_time` (string, optional) — *Value must be > P0D*
- `smooth_cone` (boolean, optional, default: true)
- `model` (enum, optional, default: GFTC)
  - Allowed values: `OFCL`, `GFTC`, `GFTC_0623`, `GFTC_0902`

## Response

### 200

Successful Response

- `type` ("FeatureCollection", required)
- `features` (list of Feature, required)
- `bbox` (list of any, optional)

## Errors

### 401 Forecasts Cone Request Unauthorized Error

Unauthorized

- `any`

### 404 Forecasts Cone Request Not Found Error

Not Found

- `any`

### 422 Forecasts Cone Request Unprocessable Entity Error

Validation Error

- `any`

### 500 Forecasts Cone Request Internal Server Error

Internal Server Error

- `any`

## Types

### Feature

Feature Model

- `type` ("Feature", required)
- `bbox` (list of any, optional)
- `geometry` (FeatureGeometry, optional)
- `properties` (FeatureProperties, optional)
- `id` (FeatureId, optional)

### FeatureGeometry

- `type`: `GeometryCollection`
  - `geometries` (list of GeometryCollectionGeometriesItem, required)
  - `bbox` (list of any, optional)
- `type`: `LineString`
  - `coordinates` (list of LineStringCoordinatesItem, required)
  - `bbox` (list of any, optional)
- `type`: `MultiLineString`
  - `coordinates` (list of list of MultiLineStringCoordinatesItemItem, required)
  - `bbox` (list of any, optional)
- `type`: `MultiPoint`
  - `coordinates` (list of MultiPointCoordinatesItem, required)
  - `bbox` (list of any, optional)
- `type`: `MultiPolygon`
  - `coordinates` (list of list of list of MultiPolygonCoordinatesItemItemItem, required)
  - `bbox` (list of any, optional)
- `type`: `Point`
  - `coordinates` (PointCoordinates, required)
  - `bbox` (list of any, optional)
- `type`: `Polygon`
  - `coordinates` (list of list of PolygonCoordinatesItemItem, required)
  - `bbox` (list of any, optional)

### FeatureProperties

### FeatureId

### GeometryCollectionGeometriesItem

- `type`: `GeometryCollection`
  - `geometries` (list of GeometryCollectionGeometriesItem, required)
  - `bbox` (list of any, optional)
- `type`: `LineString`
  - `coordinates` (list of LineStringCoordinatesItem, required)
  - `bbox` (list of any, optional)
- `type`: `MultiLineString`
  - `coordinates` (list of list of MultiLineStringCoordinatesItemItem, required)
  - `bbox` (list of any, optional)
- `type`: `MultiPoint`
  - `coordinates` (list of MultiPointCoordinatesItem, required)
  - `bbox` (list of any, optional)
- `type`: `MultiPolygon`
  - `coordinates` (list of list of list of MultiPolygonCoordinatesItemItemItem, required)
  - `bbox` (list of any, optional)
- `type`: `Point`
  - `coordinates` (PointCoordinates, required)
  - `bbox` (list of any, optional)
- `type`: `Polygon`
  - `coordinates` (list of list of PolygonCoordinatesItemItem, required)
  - `bbox` (list of any, optional)

### LineStringCoordinatesItem

### MultiLineStringCoordinatesItemItem

### MultiPointCoordinatesItem

### MultiPolygonCoordinatesItemItemItem

### PointCoordinates

### PolygonCoordinatesItemItem

### BaseModel

## Examples

**Response**

```json
{
  "type": "FeatureCollection",
  "features": [
    {
      "type": "Feature",
      "geometry": {
        "type": "GeometryCollection",
        "geometries": [
          {
            "type": "LineString",
            "coordinates": [
              []
            ]
          }
        ]
      },
      "properties": {
        "key": "value"
      },
      "id": 1
    }
  ],
  "bbox": [
    {
      "key": "value"
    }
  ]
}
```

**SDK Code**

```python
import requests

url = "https://earth.weather.silurian.ai/api/v1/cyclones/forecasts/storm_id/cone"

querystring = {"time":"2024-01-15T09:30:00Z","max_lead_time":"max_lead_time","smooth_cone":"true","model":"OFCL"}

headers = {"X-API-KEY": "<apiKey>"}

response = requests.get(url, headers=headers, params=querystring)

print(response.json())
```

```javascript
const url = 'https://earth.weather.silurian.ai/api/v1/cyclones/forecasts/storm_id/cone?time=2024-01-15T09%3A30%3A00Z&max_lead_time=max_lead_time&smooth_cone=true&model=OFCL';
const options = {method: 'GET', headers: {'X-API-KEY': '<apiKey>'}};

try {
  const response = await fetch(url, options);
  const data = await response.json();
  console.log(data);
} catch (error) {
  console.error(error);
}
```

```go
package main

import (
	"fmt"
	"net/http"
	"io"
)

func main() {

	url := "https://earth.weather.silurian.ai/api/v1/cyclones/forecasts/storm_id/cone?time=2024-01-15T09%3A30%3A00Z&max_lead_time=max_lead_time&smooth_cone=true&model=OFCL"

	req, _ := http.NewRequest("GET", url, nil)

	req.Header.Add("X-API-KEY", "<apiKey>")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(res)
	fmt.Println(string(body))

}
```

```ruby
require 'uri'
require 'net/http'

url = URI("https://earth.weather.silurian.ai/api/v1/cyclones/forecasts/storm_id/cone?time=2024-01-15T09%3A30%3A00Z&max_lead_time=max_lead_time&smooth_cone=true&model=OFCL")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Get.new(url)
request["X-API-KEY"] = '<apiKey>'

response = http.request(request)
puts response.read_body
```

```java
import com.mashape.unirest.http.HttpResponse;
import com.mashape.unirest.http.Unirest;

HttpResponse<String> response = Unirest.get("https://earth.weather.silurian.ai/api/v1/cyclones/forecasts/storm_id/cone?time=2024-01-15T09%3A30%3A00Z&max_lead_time=max_lead_time&smooth_cone=true&model=OFCL")
  .header("X-API-KEY", "<apiKey>")
  .asString();
```

```php
<?php
require_once('vendor/autoload.php');

$client = new \GuzzleHttp\Client();

$response = $client->request('GET', 'https://earth.weather.silurian.ai/api/v1/cyclones/forecasts/storm_id/cone?time=2024-01-15T09%3A30%3A00Z&max_lead_time=max_lead_time&smooth_cone=true&model=OFCL', [
  'headers' => [
    'X-API-KEY' => '<apiKey>',
  ],
]);

echo $response->getBody();
```

```csharp
using RestSharp;

var client = new RestClient("https://earth.weather.silurian.ai/api/v1/cyclones/forecasts/storm_id/cone?time=2024-01-15T09%3A30%3A00Z&max_lead_time=max_lead_time&smooth_cone=true&model=OFCL");
var request = new RestRequest(Method.GET);
request.AddHeader("X-API-KEY", "<apiKey>");
IRestResponse response = client.Execute(request);
```

```swift
import Foundation

let headers = ["X-API-KEY": "<apiKey>"]

let request = NSMutableURLRequest(url: NSURL(string: "https://earth.weather.silurian.ai/api/v1/cyclones/forecasts/storm_id/cone?time=2024-01-15T09%3A30%3A00Z&max_lead_time=max_lead_time&smooth_cone=true&model=OFCL")! as URL,
                                        cachePolicy: .useProtocolCachePolicy,
                                    timeoutInterval: 10.0)
request.httpMethod = "GET"
request.allHTTPHeaderFields = headers

let session = URLSession.shared
let dataTask = session.dataTask(with: request as URLRequest, completionHandler: { (data, response, error) -> Void in
  if (error != nil) {
    print(error as Any)
  } else {
    let httpResponse = response as? HTTPURLResponse
    print(httpResponse)
  }
})

dataTask.resume()
```