On March 26, 2025, weather conditions across Japan will be significantly affected by the arrival of yellow sand, also known as kosa, which is expected to impair visibility and pose health risks. Following an unseasonably warm day on March 25, forecasts now prompt caution as affected regions prepare for high winds and reduced visibility.
According to the Japan Meteorological Agency, recent weather patterns have caused yellow sand to travel from the continent into Japanese airspace, first being confirmed in places like Tokyo and Osaka on March 25. On this day, temperatures soared, with summer-like conditions reported: Otsuki City in Yamanashi Prefecture reaching a high of 25.5 degrees Celsius, while others like Kofu City observed temperatures of 24.5 degrees and Katsunuma in Koshu City recorded 23.8 degrees—a phenomenon usually associated with late spring rather than late March.
However, rising temperatures brought on conditions ripe for yellow sand accumulation. Meteorological observatories noted that by mid-morning on March 26, visibility across key urban areas, along with many prefectures, would plummet to below 10 kilometers. Some regions may see visibility drop to less than 5 kilometers due to the airborne debris, prompting concerns over traffic safety and health hazards, particularly for those with respiratory issues.
Experts from the Kofu Local Meteorological Observatory have advised residents to take necessary precautions. Matsumoto Mamoru, the observatory's head of observation and forecasting, warned that “kosa tends to arrive most frequently between March and May,” urging residents to keep their laundry indoors to prevent staining from the dust.
As the yellow sand continues to impact the weather, forecasters predict that high winds will also intensify throughout the day, adding to the concern for coastal areas where high waves may present additional risks. Specifically, warnings have been issued for maritime activities due to anticipated turbulent sea conditions.
Health risks associated with yellow sand are particularly notable, as it could exacerbate symptoms of pollen allergies and asthma for many individuals. The observatory recommended wearing masks outdoors to mitigate these effects.
The extended forecast shows that daytime highs will vary throughout the country, with places like Miyazaki City possibly reaching 28 degrees Celsius, while Tokyo, Shizuoka, and Kofu expect highs near 27 degrees. Regions such as Saitama and Kochi will see around 25 degrees. This spring-like warmth, coupled with the yellow sand phenomenon, marks a striking deviation from typical weather patterns for this time of year.
As Japan navigates the complexities of this weather pattern, officials reiterate the importance of staying informed and prepared. They emphasize that understanding these weather challenges will be crucial in ensuring the safety and health of the populace during this unusual seasonal transition. In regions susceptible to yellow sand, visible impacts on health and visibility should be taken seriously, as residents are urged to monitor updates from local meteorological sources.
In summary, March 26, 2025, will see a combination of yellow sand and anomalously warm temperatures across Japan. As authorities continue to monitor these conditions, residents are urged to remain vigilant and ready to adapt to the changing environment.
