First, we had unusual cold, then a freezing-rain ice storm, then heavy rain, and then unusual warmth.
But the weather gods are not through with us.
A powerful storm may develop off our coast on Tuesday.
A Profound Change in Atmospheric Circulation
Let me show you the upper level (500 hPa, about 18,000 ft) weather maps from three days ago (Wednesday at 10 AM) and yesterday at the same time.
A profound change. On Wednesday, a deep trough of low pressure was inland while a ridge of low pressure was offshore, resulting in a strong, cold airstream from the northwest.