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Combrinck created the topic: Volume 2, Page 142 - Q29 - Warm fronts
When comparing the correct answer to question 29 on page 142 with the text on page 115, they do not seem to be consistent: Page 142 states "Nil weather" to the question as to what weather situations would be most likely after the passage of a warm front while page 115 states, "Warm fronts feature almost every cloud type in the book. ...... extensive nimbostratus forms with associated heavy and continuous rain or snow."
i dont have access to the material you are quoting, however.... These questions address weather during a warm front and weather AFTER a warm front passes. Warm fronts equal low pressure and instability, warm air is great at holding water. As a warm/wet bunch of air hits cooler air it gets forced up. You now have all the ingredients of thunderstorm and rubbish weather.
After the warm front passes (i.e its getting cooler) it is saying the the air mass is now becomig stable, cooler, higher pressure. The airmass now lends itself to better weather.
so, the bottom line is that during a warm front, horrible weather. After a warm front better weather.
I think you will find that the question relates to the weather to be expected AFTER the passage of a warm front. The weather you have described would be expected before the passage of the warm front followed by a rapid clearing to good conditions. By the way, Australia is not affected by warm fronts. They form south of the continent and move south.