Chapter 7-14 Hw

CHAPTER 7

1-WHAT IS THE PRIMARY DIFFERENCE BETWEEN A CLOUD DROPLET AND A RAINDROP?

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2-WHY DO TYPICAL CLOUD DROPLETS SELDOM REACH THE GROUND AS RAIN?

Because they are so small and light that any vertical motion in the atmosphere, even very slight, is sufficient to hold them aloft. That is why the clouds, which are composed of either cloud droplets or tiny ice crystals, do not fall. And what droplets did fall would evaporate once they got into the warmer air layers below them.

3-DESCRIBE HOW THE PROCESS OF COLLISION AND COALESCENCE PRODUCES PRECIPITATION?

For collision and coalescence, this process occurs without ice crystals. Cloud droplets fall at different rates and some water droplets will grow larger while some get pushed away.

9-WHY DO HEAVY SHOWERS USUALLY FALL FROM CUMULIFORM CLOUDS? WHY DOES STEADY PRECIPITATION NORMALLY FALL FROM STRATIFORM CLOUDS?

cumuliform clouds are generally a sign of unstable air and the presence of cold fronts. When you have precipitation in those conditions, it is often showery in nature. The unstable air also provides (generally) better visibility and puffier clouds.

Stratiform clouds are suggestive of stable air and possibly warm fronts. in those conditions, you generally have steady rain (not showers), calm winds, lower visibility, and flatter clouds.

10-WHY ARE LARGE SNOWFLAKES USUALLY OBSERVED WHEN THE AIR TEMPERATURE NEAR THE GROUND IS JUST BELOW FREEZING?

because there is high moisture content in the air. When snowflakes fall through extremely cold air, there is less moisture in the air, and they are much smaller

14-EXPLAINED HOW CLOUDS CAN BE SEEDED NATURALLY?

Cloud seeding is the process of introducing "ice" nuclei into a cloud to create precipitation. It takes place by the Bergeron process, and can only occur in cold or cool clouds.

17-HOW DO THE ATMOSPHERIC CONDITIONS THAT PRODUCE SLEET DIFFER FROM THOSE THAT PRODUCE HAIL?

Hail forms in clouds when ice crystals collide with supercooled water droplets...