Explain Why the Observation of a Halo Around the Moon

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The Answer is Heading toward a warm front, the following weather sequence is commonly observed. At first, cirrus (Ci)clouds gradually thicken into a thin, white veil of cirrostratus (Cs)whose ice crystals cast a halo around the Sun. Almost imperceptibly, the clouds thicken and lower, becoming altocumulus (Ac)and altostratus (As)through which the Sun shows only as a faint spot against an overcast gray sky. Snowflakes begin to fall, and we are still over 600 km (370 mi)from the surface front. The snow increases, and the clouds thicken into a sheet-like covering of nimbostratus (Ns). The winds become brisk out of the southeast, whereas the atmospheric pressure slowly falls. Within 400 km (250 mi)of the front, the cold surface air mass is now quite shallow. The surface air temperature moderates and, as we approach the front, the light snow changes first into sleet. It then becomes freezing rain and finally rain and drizzle as the air temperature climbs above freezing. Overall, precipitation remains light or moderate but covers a broad area. Moving still closer to the front, warm, moist air mixes with cold, moist air, producing ragged wind-blown stratus (St)and fog.

Explain Why the Observation of a Halo Around the Moon

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