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In the four recent (2017\u20132019) geomagnetic storm cases examined in this study (i.e., 2018\u201008\u201025\/26, 2017\u201009\u201007\/08, 2017\u201005\u201027\/28, and 2016\u201002\u201002\/03 with minimum SYM\u2010H index \u2212206, \u2212146, \u2212142, and \u221258\u00a0nT, respectively), MSTIDs were observed from dusk\u2010to\u2010midnight local times predominately during the intervals of interplanetary magnetic field (IMF) Bz stably southward. Multiple wavefronts of the TIDs were elongated NW\u2010SE, 2\u00b0\u20133\u00b0 longitude apart, and southwestward propagated at a range of zonal phase speeds between 100 and 300\u00a0m\/s. These TIDs initiated in the northeastern US and intensified or developed in the central US with either the coincident SED structure (especially the SED basis region) or concurrent small electron density patches adjacent to the SED. Observations also indicate coincident intense storm time electric fields associated with the magnetosphere\u2013ionosphere\u2013thermosphere coupling electrodynamics at subauroral latitudes (such as SAPS) as well as enhanced thermospheric westward winds. We speculate that these electric fields trigger plasma instability (with large growth rates) and MSTIDs. 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