sentences:  Long period internal waves in larger lakes can be influenced by Coriolis forces (due to the Earth's rotation).This is expected to occur when the period of internal seiche becomes comparable to the local inertial period, which is 16.971 hours at a latitude of 45 °N (link to Coriolis utility).In large lakes (such a Lake Simcoe, Lake Geneva, Lake Michigan or Lake Ontario) the observed frequencies of internal seiches are dominated by Poincaré waves and Kelvin waves.