Key Facts
• October 27-28: Strong cold air to peak, creating winter pressure patterns.
• Hokkaido’s inland lowlands may experience snow; heavy snow possible in mountainous areas.
• -6°C air mass at 1,500m altitude to reach central Hokkaido; 0°C air mass to move south to Hokuriku.
• 69% of Hokkaido drivers have not switched to winter tires; only 30% have completed the change.
• October 24-25 survey: 429 respondents, showing a 15% increase in winter tire preparation.
• Sapporo observed its first snow this week, signaling the approach of winter.
• Coastal Hokkaido may face winds exceeding 20m/s, with risks of storms and blizzards.
• Eastern Japan and Tohoku’s high-altitude areas may also see snow and potential accumulation.
• Severe weather risks include thunderstorms, hail, and strong winds in Hokuriku and Tohoku.
• “Kogarashi 1-gou” (first winter wind) possible in Kanto and Kansai regions if wind speed criteria are met.
Summary
A strong cold air mass is expected to bring significant weather changes to Japan early next week, peaking on October 28. Hokkaido’s inland lowlands may see snow, with heavy snowfall likely in mountainous areas. Coastal regions face risks of storms and blizzards, while eastern Japan and Tohoku’s high-altitude areas may also experience snow. A survey revealed that 69% of Hokkaido drivers have yet to switch to winter tires, despite Sapporo’s first snow this week. Severe weather phenomena, including thunderstorms and hail, are anticipated in Hokuriku and Tohoku. The first winter wind, “Kogarashi 1-gou,” may occur in Kanto and Kansai if conditions align. Residents are advised to prepare for winter conditions and monitor updates.
