80 20 aG0 40 9 40 60 B C 20 80 0 100 Cloud Thickness (km) Figure 7-4 Figure 7-4

Question

80 20 aG0 40 9 40 60 B C 20 80 0 100 Cloud Thickness (km) Figure 7-4 Figure 7-4 shows how cloud base height influences the probability that precipitation (if occurring) will reach the ground as drizzle or rain. The solid curve shows the probabilities for a low cloud base; the dashed curve shows the probabilities for a relatively high cloud base. 16. a. Consider precipitation from a cloud that is 3 kn thick. If the cloud has a base below 700 m, what is the probability that the precipitation will be drizzle? What is the probability that the precipitation will be rain? 13. If precipitation falls from a cloud I kn thick with a b. J the cloud base is 700 to 1400 m high, what is b. lf the cloud base is 700 to 1400 m high, what is the probability that the precipitation will be low base, what is the probability that it will be What is the probability that it will be rain? What is the probability that the precipitation will be rain? 14. If precipitation falls from a 5.5-km-thick dloud 17 Explain why precipitation from the higher cloud with a law base, what is the probability that it will be drizzle? What is the probability that it will be rain? base is less likely to strike the ground as drizzle an precipitation from the lower doud base 15, Why does the probability that the precipitation will be rain and not drizzle increase with a thicker cloud? LAB7 67

Explanation / Answer

15)

As the thickness of the could increases we see that the curve intersects at a lower percentage of drizzle ( as drizzle is moving from 0 to 100 horizontally) as we move toward 7 kms in thickness and rain percentage is higher as rain is moving from 100 to 0 horizontally

So for example at 6 km drizzle percentage is 10% but rain percentage is 100% for lower cloud base

17)

From the graph we see that higher cloud base ie the dashed curve has a varying slope compared to a uniform slope of the lower cloud base  

Hence for the same thickness of cloud precipitation from higher cloud is less likely to be a drizzle and more likely as rain compared to lower cloud

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