The arrival of what the National Weather Service called a “moderate scale” atmospheric river storm — the second such storm already in November — continued to make its approach toward the Bay Area on Wednesday, with the likely touch down sometime in the evening and a 24-hour stay anticipated.

The National Weather Service said the storm center continued to develop early Wednesday northwest of San Francisco, and it will bring with it a strong cold front that will mix with the high pressure that’s created the dry conditions of the past few days. Combined, that will produce mighty strong winds, rain, and the possibility of thunder and lightning for some areas of the region, while other covered in a rain shadow may stay relatively untouched.

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