👉 Grisaille, also known as snowstorm or heavy rain, is a severe weather phenomenon characterized by heavy precipitation and often accompanied by strong winds. It occurs when there is an accumulation of moisture (usually ice) in the atmosphere that does not dissipate quickly enough due to high temperatures and humidity. This can lead to the formation of clouds, which can then become snowflakes or ice crystals, which can fall as rain or snow. Grisaille can occur on both land and sea surfaces,