Czechia - Soaring Weather API
High-resolution WRF forecasts across the whole country. Raná, the Beskydy ridges along the Slovak border, the Krkonoše, Kozákov, Doubrava, Javorový, and every coordinate across Bohemia and Moravia - thermal strength, cloudbase, convergence, day rating, served as JSON four times a day.
Model specifications
What you get for Czechia coverage
All fields available now at 4 km.
Thermal Strength
wstar_ms - thermal updraft velocity in m/s
Soaring Height
hglider_agl_m + hglider_msl_m - usable thermalling height
Cloudbase
cloudbase_agl_ft + cloudbase_msl_m, Cu potential, OD risk
Wind
surface_wind_* plus wind_925_*, wind_850_*, wind_800_*, wind_700_*
Trigger Temperature
thermal_trigger_temp_c - surface temperature at which thermals fire
Day Rating
day_rating - poor, marginal, fair, good, excellent
Corridor Sampling
Weather along a route - time-aware available
Sounding Profile
Full vertical profile - temp, dewpoint, wind
Query Czechia forecasts in seconds
Pass region, resolution, and any covered coordinate - the API resolves the nearest model grid point and returns the forecast.
Request
curl "https://api.convek.dev/v1/site?region=cz&resolution=4km&lat=50.41&lon=13.78&time=13:00" \-H "Authorization: Bearer cvk_live_your_key_here"
Response
{"valid_date": "2026-05-09","valid_time": "11:00","rasp_model": "cz/4km","site": {"wstar_ms": 2.1,"hglider_agl_m": 808,"cloudbase_agl_ft": 3142,"cloudbase_msl_m": 1206,"surface_wind_speed_ms": 0.4,"surface_wind_dir_deg": 5,"day_rating": "fair"}}
About soaring weather in Czechia
Czechia is the country that proves Convek is not only an Alpine product. Czech XC is competitive at European level - the records out of Raná routinely hit the high hundreds of kilometres - and the underlying meteorology is exactly the kind of mid-elevation flatland-and-ridge mix that benefits enormously from going from 13 km to 4 km.
The terrain looks easier than the Alps, which is exactly why most pilots flying it are stuck with global-model output that gets the convergence and ridge-lift detail completely wrong. Convergence lines along the main highland boundaries, ridge lift on the Krušné Hory, the warm-sector flow patterns that drive long Moravian XC days - all of it sharpens up at 4 km.
For Czech tasks specifically, the corridor endpoint is the one to know about. /v1/corridor in time-aware mode samples forecast fields along an actual track rather than at fixed waypoints, with the forecast hour advancing as the track does. Long flat Czech XC tasks that thread between airspace and convergence lines are the use case it was designed for. Day-window and sounding labels use Europe/Prague.
Czechia coordinate range
The live cz/4km region covers Bohemia, Moravia and the Czech ridges. Valid coordinates for queries sit inside this bounding box:
Latitude
48.0° N - 51.6° N
Longitude
11.4° E - 19.6° E
Requests outside this domain return 400 Bad Request with a message explaining the coordinates are outside cz coverage. See the coverage overview for other regions.
Start querying Czechia soaring data now.
Free tier - 25 queries/day. No credit card required.