The City of Vancouver, British Columbia noticed that the frequency of rainstorm related flooding episodes within the City had increased in recent years. They requested that Environment Canada study available rainfall intensity measurements for any trends. The study focused on measurements taken at Vancouver International Airport because it had a relatively long continuous record (1961 to 1996) of high quality rainfall intensity data. For each year, the number of days when the rainfall intensity exceeded 10 mm/hour was determined for standard duration intervals of 5, 10, 15, 30 and 60 minutes. For all duration intervals, there was a substantial increase in rainfall intensity when the decade ending in 1976 was compared to the decade ending in 1986. For 15 and 30 minute durations, this increasing trend continued and the number of days for the decade ending in 1996 were nearly double the number of days for the decade ending in 1976. A comparison with rainfall measurements taken at nearby airports in Victoria, Abbotsford and Comox did not show a similar trend which suggests that the recent changes in Vancouver were localized. It is not obvious what elevated the frequency of intense rainfall events in the late 1980’s and through the 1990’s in Vancouver but it is conceivable that increased urbanization and development played a role.