Japan's weather officials say torrential rain could hit areas along the Pacific
The Meteorological Agency says atmospheric conditions are extremely unstable mainly in areas along the Pacific. The cause is warm and moist air flowing along the edge of a high pressure system stretching around Japan.
Rainclouds are developing in parts of the Tokai, Kinki, Kanto-Koshin and other regions.
In the hour up to 11 a.m. on Wednesday, 31 millimeters of rain was recorded in Toba City, Mie Prefecture, central Japan.
Weather officials say that the high pressure system will stretch westward through Thursday, bringing localized torrential rain in some areas as moist air flows into eastern and western Japan.
In the 24 hours through Thursday noon, up to 250 millimeters of rain is forecast in Shizuoka Prefecture, with up to 200 millimeters expected in other parts of the Tokai region. Up to 180 millimeters of rain is likely in the Kanto-Koshin region, and 120 millimeters in the Shikoku region.
The downpours are expected to continue later in the week. In the 24 hours through Friday noon, 200 millimeters of rain is forecast in the Shikoku region, while 120 millimeters is likely in Tokai. Kanto-Koshin may see up to 80 millimeters.
The continued rain has loosened the ground in the Tokai region, possibly raising the risk of disasters.
The agency is urging people to be on the alert for landslides, flooding in low-lying areas and swollen rivers. It is also urging caution against lightning and severe wind gusts, tornadoes, and hail.
The warm and moist air is also raising temperatures in areas along the Sea of Japan and elsewhere. By 11 a.m. on Wednesday, the mercury climbed to 36.4 degrees Celsius in Joetsu City, Niigata Prefecture.
Temperatures are expected to keep rising in the afternoon, with a high of 38 degrees likely in Joetsu City, and Yonago City, Tottori Prefecture.
The agency has issued heat stroke alerts across the country.
People are advised to take precautions against heatstroke. That includes using air conditioning, consuming adequate amounts of water and salt, and resting frequently when working outdoors.
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