Traditional Culture Encyclopedia - Weather forecast - What do the lines 520, 528, 584 and 588 in the 500 hectopascal weather map represent?

What do the lines 520, 528, 584 and 588 in the 500 hectopascal weather map represent?

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The standard air pressure is101325pa =1013.25hpa? There is low pressure below and high pressure above.

In the weather map of 500 hectopascals? Look at my icon. low pressure center

520? 528? 584? Is the isobar represented by this 588 the same pressure? Almost the same height.

According to sine wave curve, the peak is called ridge and the trough is called valley. Trough is a system that brings rainy weather, while ridge corresponds to sunny day? A line high pressure ridge line C line is low pressure trough? Is it sunny in area B? It's rainy and snowy in area C.