Japan is bracing for early winter weather as freezing temperatures sweep across the nation, particularly affecting Hokkaido and the Tohoku region. On December 5, 2023, temperatures dropped significantly, marking the first winter day of the season, with urban areas like Tokyo experiencing lows below zero degrees Celsius.
The Japan Meteorological Agency (JMA) recorded the temperature at 6:29 AM at minus 0.2 degrees Celsius, signaling the onset of winter earlier than the previous year, which did not see its first winter day until January 25. Notably, both Hiroshima and Tottori cities reported similar lows on this brisk morning, contributing to anxieties about road safety.
Snowfall remains persistent across the nation's northern regions, particularly along the Sea of Japan. Conditions are exacerbated by icy roads—an issue underscored by local reports detailing extreme weather impacts on travel. "Road conditions remain treacherous as snow continues to affect traffic, especially during return trips from travel," added the JMA on their traffic advisory.
The JMA predicts continued snowfall through the week, with significant accumulations expected in mountainous areas of western Japan as well. Precautions for motorists are advised, especially for those attempting to navigate the snowy terrain. The combined effects of low temperatures and consistent snowfall have created large snowbanks at the sides of roads, impeding visibility and making travel increasingly dangerous.
Beyond immediate travel concerns, this cold snap also leads to serious potential for accidents and hazardous slips during this early winter weather. Residents are encouraged to remain vigilant and check local updates frequently to stay informed of changing road conditions and weather forecasts.
The occurrence known as 'radiative cooling' is leading to these chilling nighttime temperatures. Typically during winter, clear skies at night allow heat at the Earth's surface to escape more readily, causing significant drops in temperature. This phenomenon is most pronounced when winds are light and the atmosphere is clear, leading to extremely low readings overnight.
Officials urge individuals to dress warmly and take care outdoors, as this year's early winter arrives approximately 20 days earlier than last season. Changes to routine, including proper attire and cautious behavior outdoors, are recommended as snowfall and icy conditions persist.
Looking forward, the forecast indicates temperatures will remain low with the potential for increased snow coverage over several days. With winter-type pressure dominating, the JMA warns, "Snow will continue to impact many regions on December 7, primarily focusing on mountainous areas of western Japan where snowfall is expected to be severe.”
Residents are urged to prepare adequately before venturing out, ensuring they check weather predictions regularly and adjust their travel plans accordingly. The onset of winter can present various challenges, but with the right precautions, individuals can navigate the cold and snow safely.