The dynamic movement is unique to the
"Pacific Ocean-grown Unkai" at Tomamu
In the summer, the sea temperature off Tokachi and Kushiro remains low. When the warm south wind from the south driven by Pacific Ocean high-pressure occurs, massive low clouds (sea fog) occur in the sea off the east part of Hokkaido. The low clouds cover Tokachi Plain by the south-east wind and travel over Hidaka Mountains (mountains at slightly clouds’ altitude) finally to reach Tomamu. Tomamu Mountain is located at some distance almost reachable from the Pacific Ocean-grown Unkai (Sea of Clouds), and we can say the Unkai (Sea of Clouds) is quite unique to Tomamu. If the overflow of clouds over Hidaka Mountains is too strong, UNKAI Terrace is covered by the clouds. If the overflow is too weak, then the clouds are blocked by Hidaka Mountains (in the latter case Tomamu-grown cloud sea can often be seen). The waterfall-like UNKAI (Sea of Cloud) can only be seen when all conditions are perfectly met. It can be said that "the phenomenon is worth watching as it can rarely be seen".
Conditions favoring the occurrence of Pacific Ocean-grown Unkai
・East Hokkaido (Tokachi offshore area) is covered by high atmospheric pressure, and sea fog is occurring
・An east-southeast wind is blowing towards Tomamu area
・The wind condition has been weak since the night before until dawn