Yakutsk soon turned into a major base for further Russian expeditions eastward, southward and northward. Racial zoning laws followed the migration of Southern blacks northward and westward. I-81 connects northward to Hagerstown and Harrisburg, and continues southward to Winchester and Roanoke. The 1906 rupture propagated both northward and southward for a total of . The March equinox occurs about when the Sun appears to cross the celestial equator northward. It transports warm, tropical water northward toward the polar region. Baltimore County is part of the Northeast megalopolis, which stretches from Virginia northward to Boston. This is due to the northward movement of the Intertropical Convergence Zone to southern China. Rising temperatures and increasing daylengths influence the initiation of the northward migration. Southern Sweden is predominantly agricultural, with increasing forest coverage northward. It is now abundant on rocky shores from New Jersey northward to Newfoundland. The northern species remains "Actinemys marmorata", with a range of northern California northward. Their exact migratory path northward is equally indistinct. The controller continued to direct the flight northward, away from the airport. The German surrender obstructed the progress of the columns fleeing Croatia northward.