The 1939 Pacific typhoon season has no official bounds; it ran year-round in 1939, but most tropical cyclones tend to form in the northwestern Pacific Ocean between May and November. These dates conventionally delimit the period of each year when most tropical cyclones form in the northwestern Pacific Ocean. The scope of this article is limited to the Pacific Ocean, north of the equator and west of the international date line. Storms that form east of the date line and north of the equator are called hurricanes; see 1939 Pacific hurricane season. Storms in the season were tracked by the United States Weather Bureau and released in the Monthly Weather Review under the header "Typhoons and Depressions over the Far East". The Monthly Weather Review only covers tropical cyclones west of 150° E. Due to lack of satellites and ship reports due to the Pacific Theatre of World War II, it is possible other tropical cyclones existed, especially if they were short-lived or of minor intensity. There were 29 known tropical cyclones, including 24 of typhoon status, of which several of the storms were deadly. A typhoon in November was the deadliest cyclone of the season, causing 49 deaths as it crossed the Philippines. The same typhoon later struck Hong Kong, where the Hong Kong Observatory recorded the first period of calm during the eye of a cyclone. At least 151 people were killed during the season, with 12 missing and unconfirmed of their status during some point during the season. Systems February–May A depression was first observed on February 3 while located about of Yap. It tracked steadily westward until February 7 when it stalled about east of the Philippine island of Mindanao. The depression remained nearly stationary for two days until turning to a steady northwest motion. It approached the island of Samar Island on February 12, where a pressure of was reported, and subsequently turned to the north and later to the northeast. The depression was last observed on February 16 accelerating towards the Aleutian Islands. The system produced heavy rainfall in the Philippines, with extensive flooding reported in Surigao del Norte. On April 29, an area of low pressure was located about south of Yap. It moved westward, northward, and ultimately to the west-northwest before developing into a tropical depression on May 2 to the east of the Philippines. Early on May 3, after intensifying into