Most late migrating northbound shorebirds HATE southern ontario. Very little habitat and very little food!
With migration conditions being near perfect i.e clear skies and se wind very few whimbrel, sanderling, red knots, ruddy turnstones like to set down in southern Ontario.
When they lift off from cheapeake and delware bays and the Delmara Pennisula They are usually fat/obese (lots of fuel for long distant straight flights) they want to fly straight to james and hudson bay. They only stay on the ground for extended periods if the migration weather is adverse. i.e. Thunderstorms strong NW/N headwinds. With these adverse conditions they will sit in realtively safe areas like Coburg harbour west pier, beach at darlington p.p. Presquile P.P. beach, Oshawa Second marsh, Whitby harbour west pier, and the spit.
With weather like we are having I expect the vast majority of each species to past high overhead missing us.
That said look for Ruddy turnstones in gull/tern colonies eating eggs and Whimbrels loitering in safe areas for short periods of time.