[nb 2] Subsequently, an increase in shear and the passage of a trough weakened the typhoon and caused it to turn to the northeast.

Late on June 9, the Joint Typhoon Warning Center (JTWC)[nb 3] issued a tropical cyclone formation alert (TCFA), although the system initially failed to develop due to wind shear in the region.

[6] That day, the Philippine Atmospheric, Geophysical and Astronomical Services Administration PAGASA initiated advisories and gave it the local name "Egay".

[5] A mid-latitude trough to the north weakened the ridge, which allowed Soudelor to turn more to the northwest off the northeast coast of the Philippines.

The circulation became exposed from the deepest convection,[4] and around that time the storm was located about 160 km (100 mi) east of Samar Island.

[5] Late on June 16, the JTWC upgraded Soudelor to a typhoon,[4] and the next day the JMA followed suit when the storm was located southeast of Taiwan.

[6] Around the time that Soudelor became a typhoon, it began moving toward the north, influenced by an approaching trough, and it passed about 95 km (60 mi) northeast of Luzon.

[5] Early on June 19, the JMA downgraded Soudelor below typhoon status, and the storm later crossed Tsushima Island into the Sea of Japan.

[7] As the typhoon tracked near Taiwan, the Japan Meteorological Agency began advising residents in Okinawa to closely monitor the storm.

One of the major airlines in Japan, All Nippon Airways, cancelled 66 domestic flights the same day, stranding an estimated 6,000 people.

[12] On June 17, the Korean Meteorological Agency issued rain warnings for Jeju Island and coastal areas of South Korea.

[14] While Soudelor was moving to the northwest off the east coast of the Philippines, it dropped heavy rainfall, including 300 mm (12 in) in 24 hours in Catarman, Northern Samar.

Road crews were quickly dispatched to the area but had to suspend cleanup efforts due to continuing impacts from Soudelor.

Dozens of tour buses carrying tourists who were being evacuated from the mountains were blocked several times by mudslides covering roads.

[5] On Ishigaki Island, the storm caused ¥77.9 million (2003 JPY, $655,000 2003 USD)[nb 6] in agriculture damage, mostly from high waves.

[20] Soudelor dropped heavy rainfall throughout Japan, peaking at 497 mm (19.6 in) in Kagoshima Prefecture; most of the precipitation fell in about 24 hours.

[19] A North Korean cargo ship was stranded off the northwest coast of Japan after being refused entry into the Japanese port of Toyama.