Convek
Thermal forecast API

Thermal forecast API for soaring software.

Thermal forecasts are hard to extract from generic weather APIs. Convek post-processes WRF output into RASP-style thermal fields so your app can show how strong the day is likely to be, when it turns on, and how high pilots can climb.

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What Convek gives you

  • Hourly thermal strength as `wstar_ms`.
  • Usable soaring height as `hglider_agl_m`.
  • Boundary layer height, cloudbase, day rating, and a nullable trigger-temperature field reserved for the planned trigger diagnostic.
  • Live 4 km model domains across UK, Germany, Switzerland, Austria, Slovenia, and Czechia at 4 km.

What it does not give you

  • A guarantee that thermals will work at a specific field or hill.
  • Site safety advice, launch suitability, or real-time observations.
  • Airspace, live tracking, or task scoring.

Example API call

Thermal fields using a normal bearer API key.

Request

curl "https://api.convek.dev/v1/forecast?region=de&resolution=4km&lat=48.08&lon=9.19&date=2026-05-25" \
  -H "Authorization: Bearer cvk_live_your_key_here"

Response

{
  "valid_date": "2026-05-25",
  "rasp_model": "de/4km",
  "hours": [
    {
      "valid_time": "13:00",
      "site": {
        "wstar_ms": 2.1,
        "hglider_agl_m": 1780,
        "thermal_trigger_temp_c": null,
        "day_rating": "good"
      }
    }
  ]
}

Endpoints this maps to

GET /v1/site

Thermal fields for one site and hour.

GET /v1/forecast

Hourly thermal curve for a full forecast day.

GET /v1/grid

Thermal field grids for maps.

POST /v1/corridor

Thermal profile along an XC route.

When to pair it with other data

openAIP

Add airspace and site context around the thermal forecast.

OGN

Compare forecast lift with live pilot movement and traffic.

Open-Meteo

Use for generic rain, temperature, and global fallback data.

Current coverage

Live 4 km regions are UK, Germany, Switzerland, Austria, Slovenia, and Czechia.

Route-first data

Corridor sampling turns a route into hourly forecast conditions along the line.

Built for integration

REST JSON, API keys, OpenAPI docs, sandbox keys, and stable endpoint names.

Use it in a real product.

Use this page as the API answer for thermal forecast data, wstar, soaring height, and trigger-temperature searches.

See examplesCheck coverage