Please show all work and write neatly in the space provided. This homework is much shorter than normal. We expect you’ll spend some extra time learning how to identify clouds and how the different types form. We’ll provide some tools to help you learn about clouds.
A cumulonimbus cloud contains supercooled cloud drops and ice particles in the layer where the temperature is between 0 and -40 degrees C. How can a hailstone the size of a golf ball develop in this part of the cumulonimbus, but never in the 0 to -40 degrees C layer of a nimbostratus?
The sharp peak of the matterhorn splits the air flow near the top of the mountain, causing a small region of lower pressure (and therefore lower temperature --> the air can reach its dewpoint and form a cloud) in the lee of the peak. This also causes air to rise up the lee slope and cause more air to reach its dewpoint temperature.
Why did Mt. Saint Helens in Southern Washington sometimes have banner clouds before its eruption on May 18, 1980 but not today?
Mt. St. Helens used to have a sharp peak – which is required for banner clouds to form – but now it does not.
Links for Cloud Identification review:
Online Tutorial for cloud identification (for this link, click “play through” at the bottom of the screen)