Using high frequency oblique sounding data, we study variations of the maximum observed frequencies (MOFs) as responses to the passage of large-scale traveling ionospheric disturbances (LS TIDs) during weak and moderate magnetic storms in 2006-2011. For this, the relative deviations of MOFs from the median values are calculated. Twenty-three magnetic storms were considered, during 11 of which LS TIDs were recorded, and their average amplitudes and periods were determined.