Intense sea-effect snowfall case on the western coast of Finland

摘要: Abstract. A new national daily snowfall record was measured in Finland on 8 January 2016 when it snowed 73 cm (31 mm as liquid water) less than a day Merikarvia the western coast of Finland. The area most intense very small, which is common convective precipitation. In this work we used hourly weather radar images to identify sea-effect case and qualitatively estimate performance HARMONIE, non-hydrostatic convection-permitting prediction model, simulating spatial temporal evolution snowbands. model simulation, including data assimilation, run at 2.5 km horizontal resolution 65 levels vertical. HARMONIE found capture overall situation quite well, both timing location snowstorm were properly simulated. Based our preliminary analysis, snowband triggered by atmospheric instability above mostly ice-free sea low-level convergence zone almost perpendicular coastline. simulated available potential energy (CAPE) reached value 87 J kg−1 near site observed record.