Synopsis for Lake Superior .SYNOPSIS...A 29.6 inch low over eastern Ontario will move east today. A high of 30.0 inches will slide southeast across northern Ontario today and strengthen to 30.4 inches by tonight just east of Lake Superior. The region will then be influenced by a weak high of 30.2 inches centered in the northern Great Plains Sunday and Monday before a 29.5 inch trough moves through the Upper Great Lakes Monday night and into Tuesday. Lake Superior will be between systems Wednesday as low pressure of 29.5 inches pushes out of the Rockies and into the Plains. Synopsis for Lake Michigan .SYNOPSIS...A weak front stalled over southern portions of the lake early this morning will move slowly south today and clear the southern portions of the lake by evening. High pressure of 30.1 inches over Ontario will slowly move east to Maine by Sunday night. Meanwhile, low pressure of 29.0 inches will move to northern Saskatchewan Sunday afternoon and then track east to Hudson Bay by Tuesday morning with a cold front trailing south from this low moving across Lake Michigan Tuesday morning. A narrow ridge of high pressure averaging 30.3 inches will build into the western Great Lakes region in the wake of this front Tuesday night into Wednesday. Synopsis for Lake Huron .SYNOPSIS...Friday's clipper laid out a frontal trough averaging 29.90 inches across the central Great Lakes. This front will drift south and then stall over the southern lakes today as high pressure averaging 30.40 inches builds southeast into the region for tonight into Sunday. Synopsis for Lake Erie .SYNOPSIS...A cold front will drop south across Lake Erie this morning. Weak high pressure 30.00 inches will build over the lake this afternoon. The front will turn stationary across Ohio and lift north as a warm front Sunday and Monday. A cold front will move east across the lake Tuesday. A ridge averaging 30.10 inches will move east across the lake Wednesday. Synopsis for Lake Ontario .SYNOPSIS...A 29.7 inch low will weaken as it moves across Quebec to Maine today. A 30.4 inch high will then build across southern Ontario tonight before moving off the Eastern Seaboard by Monday.