000 NZUS99 KDTX 230737 RRA SYNGLF .SYNOPSIS...A LARGE LOW PRESSURE SYSTEM OVER SOUTHERN ONTARIO...AVERAGING 29.60 INCHES...WILL SLOWLY TRACK NORTHEAST THROUGH THE ST. LAWRENCE SEAWAY TODAY. THE COLD FRONT ASSOCIATED WITH THIS LOW WILL PUSH THROUGH THE SOUTHERN GREAT LAKES TODAY...ALLOWING HIGH PRESSURE TO BUILD IN ACROSS THE CENTRAL GREAT LAKES ON FRIDAY. THE HIGH WILL SETTLE OVER THE CENTRAL GREAT LAKES REGION THROUGH THE WEEKEND.