Professional Meteorological Support
for Climbers, Kiters, Sailors,…

We are happy to offer you a custom-made plan

One of the first companies to support and assist
mountaineering expeditions, kiting trips, sail trips and
all other possible adventures in isolated or extreme conditions

Marc De Keyser & Fritz Buyl

  • Professionally trained and operationally experienced meteorologists Marc De Keyser and Fritz Buyl have the expertise to support your adventure. They compose your tailor-made weather forecasts, in an accurate and flexible way.

    “Weather forecasts that will make your trip safer. That’s their commitment – every day."


    Marc De Keyser

    Marc is a Belgian Air Force trained meteorologist currently working for the Belgian Royal Meteorological Institute as an operational marine meteorologist. His first experience with polar meteorology was in 1996 when he joined the British Antarctic Survey in Rothera, Antarctic Peninsula.

    Since then he specialized in operational weather forecasting in polar areas. In 2008 he founded weather4expeditions, initially to support ski expeditions to the South Pole. During the following years he expanded his expertise to Arctic Ocean expeditions, Greenland kiting trips and big mountain mountaineering. Over the last 8 seasons he became an expert in Mount Everest forecasting.

    Marc De Keyser


    Fritz Buyl

    Fritz studied Chemistry at the University of Leuven (KUL) followed by a postgraduate degree in Environmental Sciences.

    He began sailing at age 13 and became a passionate competitor in regattas, where meteorology played an important tactical role. This allowed Fritz to start working at the Royal Meteorological Institute of Belgium as an Operational Forecaster.

    He was then lucky enough to combine his two passions, working as a Weather Router for sailors as well as forecasting for Kite driven Arctic/Antarctic expeditions.

    Fritz Buyl



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Our clients

“Probably the best forecasts in the world!”

Since establishing weather4expeditions in 2008 we are proud to have worked with following adventure companies: