Slide 2: Weather prediction
Early in the 20th century a Norwegian named Vihelm Bjerknes claimed that atmospheric physics was advanced enough to forecast weather by calculations.
He came up with 7 equations that predicted "large-scale atmospheric motions." Unfortunately these equations did not provide fast calculating methods nor provide accurate forecasting techniques.
The complexity of weather processes is such that even the crudest models were improbably calculation intensive.
It was not until simple computers were developed that national weather prediction (NWP) was feasible.
The first full time NWP was carried out by the Royal Swedish Air Force Weather Service in Stockholm in December 1954.
It forecast weather three times a week.
Shortly thereafter, NWP was implemented in most western countries.