Soaring weather forecasts, built for developers and pilots.
The world's first RASP weather API - soaring forecasts as JSON. Point queries, full-day forecasts, and grid slices for maps. Thermal strength, soaring heights, convergence, cloudbase, day ratings, wind at altitude, and boundary layer depth - 20+ RASP fields, updated four times daily.
Free tier · No credit card · 25 queries/day to start
Request
curl "https://api.convek.dev/v1/site \?region=gb&resolution=4km&lat=51.94&lon=-2.08" \-H "Authorization: Bearer cvk_live_abc123"
Response
{"valid_date": "2026-04-11","valid_time": "14:00","rasp_model": "gb/4km","site": {"wstar_ms": 2.1,"hglider_agl_m": 1340,"cloudbase_agl_ft": 4800,"surface_temp_c": 18.2,"thermal_trigger_temp_c": null,"surface_wind_speed_ms": 3.1,"surface_wind_dir_deg": 240,"dewpoint_2m_c": 8.4,"rain_total_mm": 0,"convergence_ms": 0.3,"day_rating": "good","bowen_ratio": 1.8,"cu_potential": true,"od_potential": false}}
Built for everyone in soaring aviation
Everything a soaring app needs. Nothing it doesn't.
20+ RASP fields - wstar, cloudbase, BL height, convergence, day rating, soundings, corridor sampling - all queryable by lat/lon and hour.
Thermal Strength
wstar updraft velocity - how strong are the thermals today?
Soaring Heights
BL top, thermalling ceiling, and glider-capped height in metres and feet.
Cloudbase & Cu Risk
Cloud-base height, Cu potential, and overdevelopment risk.
Surface & Altitude Wind
WRF 10m surface wind (captures valley flows, sea breeze, terrain channelling) plus 925, 850, 800, 700 hPa levels.
Corridor Sampling
POST launch point + bearing + max distance + spacing, get weather sampled along the corridor.
Day Rating
Poor to excellent soaring label. Instant "is it worth going?" answer.
Surface Conditions
Surface temperature, dewpoint, humidity, rain, heat flux, and a nullable trigger-temperature field reserved for the planned trigger diagnostic.
Sounding Profiles
Vertical atmospheric profile from surface to upper levels. Temperature, dewpoint, wind speed, and direction at every pressure level.
Route-Time-Aware Corridor
Pass launch time + ground speed, get weather sampled by estimated arrival time at each point along the route.
Flexible Time Queries
Request a specific UTC hour, or omit time and get the forecast closest to 14:00 UTC. Corridor requests can also be time-aware by arrival.
4 km Live, 2 km Next
Our own WRF simulations at 4 km today, with 2 km in development. Not repackaged global models - purpose-built for soaring.
Grid Slices for Maps
Use /v1/grid for wstar, cloudbase, day rating, wind, and convergence layers. Build maps, embeds, and club pages without hammering point queries.
From sign-up to soaring data in under a minute.
Get your API key
Create a free API key. Instant access. No approval queue.
Make a request
Use /v1/site for one hour, /v1/forecast for the whole day, or /v1/grid for map layers. JSON back in milliseconds.
Build something
Embed in your app, instrument, or personal planning tool.
See it working. Right now.
Pick your language and see the exact request and response. Need the full day at one point? Use /v1/forecast. Need map layers? Use /v1/grid.
Request
curl "https://api.convek.dev/v1/site?region=gb&resolution=4km&lat=51.94&lon=-2.08" \-H "Authorization: Bearer cvk_live_abc123"
Response
{"valid_date": "2026-04-11","valid_time": "14:00","rasp_model": "gb/4km","site": {"wstar_ms": 2.1,"hglider_agl_m": 1340,"cloudbase_agl_ft": 4800,"thermal_trigger_temp_c": null,"surface_wind_speed_ms": 3.1,"bowen_ratio": 1.8,"convergence_ms": 0.3,"day_rating": "good"}}
UK, Germany, Switzerland, Austria, Slovenia, and Czechia live. More countries on the way.
16 countries across 6 live, 4 coming soon, and 6 on the radar.
Coming Soon
Coming SoonOn the Radar
On the RadarBuilt for everyone who cares about soaring weather.
Pilots
Check thermal strength, soaring ceiling, and day rating before you drive to the airfield. Free tier available.
Developers
Integrate real soaring meteorology into your app or instrument. JSON API, API-key auth, predictable pricing.
Instrument Makers
Embed structured soaring data in cockpit displays. JSON feeds, reliable four-times-daily updates, commercial licensing.
The only developer-facing soaring weather API.
| Feature | ● LiveConvek | SkySight | TopMeteo | RASP UK |
|---|---|---|---|---|
| Developer API | Not available | |||
| Thermal strength (wstar) | ||||
| Soaring heights | ||||
| Corridor / route sampling | ||||
| Route-time-aware corridor | Yes (unique) | |||
| Sounding profiles | Some | |||
| Self-serve sign-up | Manual | Manual | ||
| JSON API responses | Maps only | Maps only | Images only |
SkySight and TopMeteo are excellent products for individual pilots. We're building the missing data layer for developers, apps, and integrations.
From country-scale to individual thermals.
We run our own WRF simulations - and we're pushing the resolution further than anyone in soaring weather has gone before.
Country-Scale Forecasts
UK, Germany, Switzerland, Austria, Slovenia, and Czechia live today. Thermals, cloudbase, convergence, wind - the full 4 km product across every country.
Higher-Resolution Forecasts
Finer terrain detail on top of the live country domains. Built for sites where 4 km still smooths out too much of the local picture.
Thermal Hotspot Maps
See where thermals actually cluster. Ridge convergence zones, trigger points, sea breeze fronts - resolved, not smoothed.
Site-Specific Forecasts
Individual launch sites, competition venues, your home ridge. On-demand high-res runs for the places that matter most.
Live today is 4 km across six countries. Everything finer than that is roadmap or research, not launch-day capability.
Ready to build with real soaring data?
Get your API key in 30 seconds. 25 queries/day, no credit card.