2.2.9 Density and wind

Two fresh snowfall scenarios

Consider these scenarios. Both take place in flat terrain, where it's snowing moderately. In the first scenario, the surface temperature is 30ºF (-1ºC) and it's windy. In the second scenario, the surface temperature is 20ºF (-7ºC) and the wind is calm. Which situation would you expect to have higher-density snowpack, all other factors being equal? Select the correct answer, then click Done.

The correct answer is a.

Scenario one is likely to have much denser snow accumulation due to the warmer temperature, which enables the air to hold more moisture. When the surface temperature is at or near freezing, the density of new snowfall is usually high. In addition, the stronger wind in the first scenario will fracture the snowflakes prior to depositing them, resulting in packed, denser snowpack.