GANSUKH MUNGUN-OD

Analysis of Snowfall Observation Results and Forecast Results on the Joshinetsu Expressway on January 3rd Year of Reiwa

Toshiro KUMAKURA

�@On January 3rd year of Reiwa, heavy snow disasters occurred in four places of Joetsu, Joetsu Takada, Nakago and Myoko Kogen, causing traffic congestion on the Joshinetsu Expressway.
�@In this study, we believe that if snowfall can be predicted in advance, it will be possible to remove snow appropriately and prevent congestion of Expressway. By setting the period up to and comparing the three data of the ground observation data, the Meteorological Agency synthetic radar, and the NHM data that consider here and clarifying the difference between the observation and the prediction, it will lead to the investigation of the cause. Explaining the three data to be used and organizing these three data, a scatter plot will be created for each location at the same time zone, and the differences will be examined in detail. Create time-series charts and scatter plots at four locations, Joetsu, Joetsu Takada, Nakago, and Myoko Kogen, and select and explain cases where the differences are large and small. 
�@In this study, Snowfall prediction results by the meteorological model NHM, and ground-based snowfall depth data along the motorway. And the meteorological agency synthetic radar data were compared. Ground-based observation Snow depth was measured at four locations, but the score was insufficient on the horizontal plane, so synthetic radar precipitation was used. Do not always match, and there were some areas that could not be seen by synthetic radar, especially in mountainous areas. As a feature of the four observation points, the three data were relatively similar in Joetsu, which is close to the coast, but the difference seemed to be larger as we went inland. However, there were times when NHM precipitation was significantly different from the observation results, and the comparison pointed out that the ground precipitation was often low overall and that the movement of snow clouds on land was different from the observation.