Question: What an event in the annual cycle of tropical cyclone formation,that was the predecessor to the six depressions throughout the year, of which five intensified into cyclonic storms?

Context articles: 1999 North Indian Ocean cyclone season
2014 North Indian Ocean cyclone season
1949 Pacific typhoon season
2006–07 South Pacific cyclone season
1970 North Indian Ocean cyclone season
2000–01 South Pacific cyclone season
2005–06 South Pacific cyclone season
2000 North Indian Ocean cyclone season
2012 North Indian Ocean cyclone season
1948 Pacific typhoon season

The 1999 North Indian Ocean cyclone season was an event in the annual cycle of tropical cyclone formation.
 The North Indian Ocean cyclone season has no official bounds, but cyclones tend to form between April and December, with peaks in May and November.
 These dates conventionally delimit the period of each year when most tropical cyclones form in the northern Indian Ocean.
The 2014 North Indian Ocean cyclone season was an event in the annual cycle of tropical cyclone formation.
 The season included two Very Severe Cyclonic Storms, both in October, and one other named cyclonic storm.
 Cyclone Hudhud is estimated to have caused US$3.4 billion in damage across eastern India, and more than 100 deaths.
The 1949 Pacific typhoon season is an event in the annual cycle of tropical cyclone formation, in which tropical cyclones form in the western Pacific Ocean.
 The season runs throughout 1949, though most tropical cyclones typically develop between May and October.
 The scope of this article is limited to the Pacific Ocean to the north of the equator between 100°E and 180th meridian.
 Within the northwestern Pacific Ocean, there are two separate agencies that assign names to tropical cyclones which can often result in a cyclone having two names.
 The Japan Meteorological Agency  will name a tropical cyclone should it be judged to have 10-minute sustained wind speeds of at least 65 km/h (40 mph) anywhere in the basin, whilst the Philippine Atmospheric, Geophysical and Astronomical Services Administration  assigns names to tropical cyclones which move into or form as a tropical depression in their area of responsibility located between 135°E and 115°E and between 5°N–25°N regardless of whether or not a tropical cyclone has already been given a name by the JMA.
 Tropical depressions that are monitored by the United States' Joint Typhoon Warning Center  are given a number with a "W" suffix.
The 2006–07 South Pacific cyclone season was an event in the annual cycle of tropical cyclone formation.
 It began on November 1, 2006 and ended on April 30, 2007.
 These dates conventionally delimit the period of each year when most tropical cyclones form in the southern Pacific Ocean east of 160°E.
 Additionally, the regional tropical cyclone operational plan defines a "tropical cyclone year" separately from a "tropical cyclone season", and the "tropical cyclone year" runs from July 1, 2006 to June 30, 2007.
The 1970 North Indian Ocean cyclone season had no bounds, but tropical cyclones in the North Indian Ocean tend to form between April and December, with peaks in May and November.
 The 1970 season saw a total of seven cyclonic storms, of which three developed into severe cyclonic storms.
 The Bay of Bengal was more active than the Arabian Sea during 1970, with all of the three severe cyclonic storms in the season forming there.
 Unusually, none of the storms in the Arabian Sea made landfall this year.
 The most significant storm of the season was the Bhola cyclone, which formed in the Bay of Bengal and hit Bangladesh on November 12.
 The storm killed at least 500,000, making it the deadliest tropical cyclone in recorded history.
The 2000–01 South Pacific cyclone season was an event in the annual cycle of tropical cyclone formation.
 It began on November 1, 2000 and ended on April 30, 2001.
 These dates conventionally delimit the period of each year when most tropical cyclones form in the southern Pacific Ocean east of 160°E.
 Additionally, the regional tropical cyclone operational plan defines a "tropical cyclone year" separately from a "tropical cyclone season", and the "tropical cyclone year" runs from July 1, 2000 to June 30, 2001.
The 2005–06 South Pacific cyclone season was an event in the annual cycle of tropical cyclone formation.
 It began on November 1, 2005 and ended on April 30, 2006.
 These dates conventionally delimit the period of each year when most tropical cyclones form in the southern Pacific Ocean east of 160°E.
 Additionally, the regional tropical cyclone operational plan defines a "tropical cyclone year" separately from a "tropical cyclone season", and the "tropical cyclone year" runs from July 1, 2005 to June 30, 2006.
The 2000 North Indian Ocean cyclone season was fairly quiet compared to its predecessor, with all of the activity originating in the Bay of Bengal.
 The basin comprises the Indian Ocean north of the equator, with warnings issued by the India Meteorological Department (IMD) in New Delhi.
 There were six depressions throughout the year, of which five intensified into cyclonic storms – tropical cyclones with winds of 65 mph (40 km/h) sustained over 3 minutes.
 Two of the storms strengthened into a very severe cyclonic storm, which has winds of at least 120 km/h (75 mph), equivalent to a minimal hurricane.
 The Joint Typhoon Warning Center (JTWC) also tracked storms in the basin on an unofficial basis, estimating winds sustained over 1 minute.
The 2012 North Indian Ocean cyclone season was an event in the annual cycle of tropical cyclone formation.
 The season had a late start, with the first system forming in October.
 During the season, only five systems formed, of which only two became cyclonic storms.
 Both the storms made landfall, and they, along with the deep depressions, were responsible for 128 deaths and economic losses worth at least $56.7 million (2012 USD).
The 1948 Pacific typhoon season is an event in the annual cycle of tropical cyclone formation, in which tropical cyclones form in the western Pacific Ocean.
 The season runs throughout 1948, though most tropical cyclones typically develop between May and October.
 The scope of this article is limited to the Pacific Ocean to the north of the equator between 100°E and 180th meridian.
 Within the northwestern Pacific Ocean, there are two separate agencies that assign names to tropical cyclones which can often result in a cyclone having two names.
 The Japan Meteorological Agency  will name a tropical cyclone should it be judged to have 10-minute sustained wind speeds of at least 65 km/h (40 mph) anywhere in the basin, whilst the Philippine Atmospheric, Geophysical and Astronomical Services Administration  assigns names to tropical cyclones which move into or form as a tropical depression in their area of responsibility located between 135°E and 115°E and between 5°N–25°N regardless of whether or not a tropical cyclone has already been given a name by the JMA.
 Tropical depressions that are monitored by the United States' Joint Typhoon Warning Center  are given a number with a "W" suffix.