[1] In 1943, Marshall underwent thoracic surgery to fight a reappearance of tuberculosis and then took the lead of the "Stormy Weather" project by the Canadian Department of National Defense whose purpose was to find a use for these parasitic echoes.

The activities of the "Stormy Weather Group" attracted more and more graduates and, in large part, enabled the formation of the full-fledged meteorological department in 1959, the first in Canada.

As director and founder, Stewart Marshall has profoundly influenced the teaching of meteorology, his department serving as a model for the creation of half a dozen programs across Canada.

[1] Marshall and R. C. Langille, a colleague from Ottawa, were the only Canadians to attend the first radar meteorology conference at the Massachusetts Institute of Technology (MIT) in 1947.

[1] Stewart Marshall and his doctoral student, Walter Palmer, became famous for their work on the distribution of mid-latitude raindrops that led to the relationship between radar return (Z for reflectivity) and precipitation rate (R): the ZR relation.