Traditional Culture Encyclopedia - Weather inquiry - What do the lines 520, 528, 584 and 588 represent in the weather of 500 hectopascals?

What do the lines 520, 528, 584 and 588 represent in the weather of 500 hectopascals?

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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.