The opposite of High Pressure is Low Pressure. You can easily see that Maine is now covered in clouds (look to the center right of the picture, New Brunswick is visible in the center). This is associated with a weak cold front that extends from the Low Pressure. Interestingly enough, the low pressure center is located in Canada, near the Hudson Bay.
The cold front generates the weather for Maine. In this particular case, it brings the chance of showers. It also, brings cooler temperatures during the day and warmer temperatures at night. The temperature shift comes from the cloud cover. We will explore the effects of cloud cover on the Earth in a another post.
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