A broad area of low pressure that has strengthened into tropical storm Kammuri is expected to hit Japan towards the end of this weekend or early next week. Though, the storm will remain to the east of Japan, just sideswiping eastern parts of the country.
Moreover, the aftereffects of storm Kammuri will not be observed by rain showers or wind pattern but change in temperature. As Kammuri tracks north east it will deepen a trough coming in out of Siberia allowing a surge of cooler air to pour in across much of Japan. This very well will be the first shot of autumn air for the country with highs in Tokyo remaining in the teens to low 20s.
The key to the movement of this cyclone in the long term will be a trough that is still more than 1,000 of miles west of Japan in Siberia. This trough will quickly move eastward and interact with the cyclone early next week.
