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 one straight XC line.

POST /v1/workflows/route-briefing

Thermal profile along a multi-point 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