The storm gradually intensified as it traveled northwest, becoming a typhoon on June 28 and reaching its peak the following day while passing through the Mariana Islands.

After maintaining typhoon intensity for three days, a combination of dry air and cooler sea surface temperatures caused the storm to weaken as it traveled northward.

While passing through the Mariana Islands, Typhoon Tingting produced torrential rains which triggered flooding and numerous landslides.

In Guam, 554.99 mm (21.850 in) of rain fell in 24 hours, breaking the daily and monthly rainfall records for June.

[nb 1] On June 24, 2004, an area of low pressure associated with developing convection formed about 1,110 km (690 mi) to the east-southeast of Guam.

[7] The ridge influencing the track of Tingting moved eastward, causing the storm to begin a gradual turn towards the north[1] At 0000 UTC on June 28, the JTWC upgraded the storm to a minimal typhoon, the equivalent of a Category 1 hurricane on the Saffir–Simpson scale,[5] and the JMA followed about six hours later.

[1] At 0900 UTC, the typhoon reached its peak intensity with winds of 150 km/h (93 mph) according to both agencies[2][5] and a minimum pressure of 955 hPa (955 mbar).

[8] However, the typhoon began to weaken due to increasing dry air and decreasing sea surface temperatures.

On July 6, the extratropical remnants of Tingting were absorbed by a developing area of low pressure located to the south of the former typhoon.

[13] However, the JMA continued to monitor Tingting as a separate system as it executed a counter-clockwise loop though July 10 before heading towards the International Date Line.

[15][16] However, Dr. Karl Hoarau of Cergy-Pontoise University near Paris, France proposed that Tingting was stronger than officially reported.

[26] As Typhoon Tingting approached the Mariana Islands, three Chinese women drowned in rough seas produced by the storm in Saipan.

Due to the lack of sufficient observations on Tinian, the highest sustained winds recorded were suspected to be lower than what they really were.

[28] Although Tingting passed about 400 km (250 mi) to the northeast of Guam, torrential rains from a monsoonal feeder band produced record-breaking rainfall.

[28] The same day that Tingting made its closest approach to Guam, a 19-year-old was swept off a reef and drowned in rough seas produced by the typhoon.

On the islands of Alamagan, Pagan, and Agrihan all private homes, a total of six, were destroyed, the food stores and crops were lost, and the water supply was contaminated.

[32] Numerous water rescues on jet skis had to be made as residents became stranded in their cars after driving into flooded roads.

[35] Throughout eastern Japan, large swells produced by Tingting caused moderate coastal damage and killed two people.

[17][18] In Urakawa District, Hokkaidō, the local fishing industry sustained considerable damage, amounting to 20.5 million JPY (US$240,000).

[21] On July 9, the Government of the Mariana Islands requested that President George W. Bush declare a major disaster area for the commonwealth.

[37] The Government of Guam requested $6 million in aid from the Federal Emergency Management Agency (FEMA) to repair the damages from Tingting.

[38] On July 29, George Bush approved the request for a disaster declaration and federal aid began to be sent to the Mariana Islands and Guam.

[41] In mid-September, a request was made by the commonwealth for $10 million in natural disaster mitigation following the effects of successive typhoons in the region.