[2] Developing out of a tropical depression near the northern Philippines in early June, Conson slowly traveled towards the north.
After turning towards the northeast, the typhoon brushed Taiwan and reached its peak intensity with 10-minute sustained winds of 150 km/h (90 mph) on June 9.
As it became extratropical, Conson caused moderate damage in southern Japan, including a few landslides which prompted evacuations.
Early on June 4, the Joint Typhoon Warning Center (JTWC) began monitoring an area of low pressure associated with deep convection about 780 km (480 mi) south-southeast of Hong Kong.
[4] Around the same time, the storm entered the Philippine Atmospheric, Geophysical and Astronomical Services Administration's area of responsibility and was given the local name Frank.
[3] A few hours later, the JMA upgraded the depression to a tropical storm and gave it the name Conson;[5] a name contributed by Vietnam that is a picturesque place in the country, consisting of a mountain, pine forest, streams, pagodas and many historical monuments.
Originally, forecasts showed the typhoon making landfall in southern Taiwan but the turn towards the northeast spared the island from a direct hit.
[3] Continuing increase in forward speed caused the low to become exposed from shower and thunderstorm activity on the southern edge of the circulation.
[9] Around 1200 UTC, the center of circulation became separated from deep convection,[3] leading to the typhoon being downgraded to a tropical storm by both agencies several hours later.
Continuing towards the northeast, the storm remained weak and was last mentioned as it crossed the International Date Line on June 14 near the Aleutian Islands.
[11][12] On June 7, the Philippine Atmospheric, Geophysical and Astronomical Services Administration raised Public Storm Signal No.
[24] Traveling towards the northeast, Conson headed towards Okinawa where schools were closed and local transportation was disrupted due to the storm.
[33] The Japan Meteorological Agency warned residents about the threat of heavy rains and high winds resulting from the storm.
[34] A United States naval base located in Okinawa was placed under a Tropical Cyclone Condition of Readiness (TCCR) Four as Typhoon Conson was approaching.
As the storm neared the islands, the naval base was put under TCCR Three, indicating that winds of 92 km/h (57 mph) were anticipated within 48 hours.
[3] Despite transitioning into an extratropical cyclone while impacting Japan,[5] Conson brought heavy rains and high winds to Kyūshū.
[40] Okinawa sustained moderate damage during the passage of Conson, with several homes flooded and large lengths of power lines were lost.
[42] A large landslide, roughly 30 m (98 ft) wide, in Matsuyama, Ehime prompted the evacuation of 19 homes; however, no known damage resulted from the incident.