He studied the application of wind and temperature measurements to gunnery as well as developing a forecasting service for artillery for the expeditionary force in Salonika.
After the war he worked at the Meteorological Office in London prior to taking up a position at the Carnegie Institution managing a new observatory at Watheroo, north of Perth in Western Australia.
He joined the Commonwealth Bureau of Meteorology in Melbourne, Australia in 1921 and only two years later was made responsible for its Research Division.
One of his early studies was an analysis of meteorological conditions during the first flight across the Tasman Sea[5] piloted by Sir Charles Kingsford Smith.
Holmboe was en route to join the Lincoln Ellsworth Antarctic Expedition (which included the Australian explorer Sir Hubert Wilkins).