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  "markdown": "Founder, Vaisala.\n\nVilho Väisälä founded Vaisala in 1936 and was its long-time managing director. A professor, he worked out operating principles of the radiosonde and sent the first Finnish radiosonde aloft in December 1931.\n\n## What Vilho builds\n\n- [Xweather Weather API](https://www.anchorterminal.com/tools/xweather.md), graded B, 67.2/100, in Weather \u0026 climate data. Xweather Weather API from Vaisala returns current conditions, forecasts to 15 days, history from 2004, official alerts, lightning, hail, air quality, maritime and road weather. Agents reach it as a REST API or a hosted MCP server. Founder, Vaisala, researched 2026-10-28.\n\n## Works with\n\n- [Brandon Clark](https://www.anchorterminal.com/people/brandon-clark/), Product Manager, API and Maps\n\n## Questions\n\n### Who is Vilho Väisälä?\n\nVilho Väisälä founded Vaisala in 1936 and was its long-time managing director. A professor, he worked out operating principles of the radiosonde and sent the first Finnish radiosonde aloft in December 1931.\n\n### What does Vaisala Oyj make?\n\nAnchor Terminal lists Xweather Weather API from Vaisala Oyj. Xweather Weather API from Vaisala returns current conditions, forecasts to 15 days, history from 2004, official alerts, lightning, hail, air quality, maritime and road weather. Agents reach it as a REST API or a hosted MCP server.\n\n### How are Vilho's tools graded?\n\nXweather Weather API is graded B, 67.2 out of 100, on Anchor Terminal's benchmark, which scores every listing against the same checklist.\n\n## Sources\n\n- https://www.linkedin.com/in/bkclark/details/experience/\n- https://www.linkedin.com/in/bkclark\n- https://www.xweather.com\n- https://x.com/vaisalaxweather\n- https://www.xweather.com/support\n- https://www.xweather.com/contact\n- https://en.wikipedia.org/wiki/Vaisala\n\nThese are the people building the tools we list, named for their public role in the company or project behind a listing, from public pages, with the date it was researched. They don't work for Anchor Terminal (our own team is on the about page, /about/#author). We show public roles, public profiles and what the listing pages show, nothing private. To correct something, send an about or a photo, or have a page removed, write to privacy@anchorterminal.com.\n",
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