The Japan Meteorological Agency said Sunday morning that the Amami region has entered the rainy season [1].

The early onset of the season increases the immediate risk of flooding and landslides, as the agency warns of warning-level heavy rain across the region through Monday [1].

According to the agency, the rainy season began nine days earlier than average [1]. This weather pattern is driven by unstable atmospheric conditions caused by the influence of low-pressure systems and weather fronts, which make it easier for rain to fall over wide areas [1].

Forecasts indicate significant precipitation levels across several regions through the morning of May 4 [1]. The Japan Meteorological Agency said that expected rainfall for Shikoku is 200 millimeters [1]. Additionally, the agency said that the Kinki, Tokai, and Kanto-Koshin regions are expected to see 150 millimeters of rain [1].

Local authorities are monitoring the situation closely as the atmospheric instability persists. The agency said the Amami region, which includes the Amami Islands in Kagoshima Prefecture, is particularly vulnerable to these early seasonal shifts [1].

Residents are advised to stay alert for official warnings and evacuation orders as the heavy rain continues through the start of the week [1].

“The rainy season began nine days earlier than average.”

An early start to the rainy season in the Amami region suggests a shift in seasonal weather patterns that may lead to higher-than-average precipitation levels earlier in the year. The combination of warning-level rain and an accelerated timeline for the rainy season increases the pressure on regional infrastructure and disaster preparedness efforts in southern Japan.