Synopsis for Lake Superior .SYNOPSIS...A 29.8 inch trough over northern Minnesota will move across Lake Superior this afternoon and reach the eastern Great Lakes on Tuesday. A 30.2 inch high pressure extending from Manitoba to Nebraska Tuesday night will move over Wisconsin Thursday morning and remain over the Great Lakes through Friday. Synopsis for Lake Michigan .SYNOPSIS...High pressure of 30.1 inches across the upper Ohio River Valley will move to the Atlantic seaboard by this evening. Low pressure of 29.7 inches will develop across the northern Great Lakes late Monday night into early Tuesday morning, and deepen quickly to 29.4 inches as it moves to western Quebec by Tuesday evening. Expansive high pressure of 30.2 inches will build eastward across the Great Lakes during the latter half of the week. Synopsis for Lake Huron .SYNOPSIS...High pressure...30.00 inches...over Michigan will gradually slide to the east today maintaining a mainly southwesterly flow which will increase Tuesday ahead of a strong cold front. This front will sweep through the Great Lake Tuesday afternoon followed by an increasingly strong northwest flow that will last through the end of the week. Synopsis for Lake Erie .SYNOPSIS...High pressure 30.10 inches will move across the lower lakes today and then shift eastward across NY State on Monday. Low pressure 29.90 inches will move northeast along a frontal boundary across the Great Lakes, forcing a cold front southeast across Lake Erie Tuesday through Tuesday night. High pressure 30.20 inches will build east across the Great Lakes Wednesday through Thursday. Synopsis for Lake Ontario .SYNOPSIS...A 30.1 inch high over western Pennsylvania this morning will move off the mid-Atlantic coast tonight, where it will stall through Tuesday. A strong cold front, averaging 29.6 inches, will then cross Lake Ontario Tuesday night. Then a 30.1 inch high will ridge from the Upper Plains to western Ontario province, expanding into the Great Lakes region on Thursday.