A strong ridge of high pressure in the upper part of the atmosphere has formed over the nation’s mid-section and the Mid-Atlantic region is on the outer periphery of this large-scale system. As such, winds aloft in this part of the nation are flowing from northwest-to-southeast and often times this time of year, the outer perimeter of strong high pressure ridging is an active zone with strong thunderstorm activity. Indeed, this “ring of fire” around the high pressure system is very active today with a complex of thunderstorms now exploding over the Upper Midwest. This “mesoscale convective system” (MCS) as it is referred to by meteorologists is likely to drop southeastward in the overnight hours and reach somewhere in the Mid-Atlantic region on Tuesday morning. Latest trends and observations suggest the worst of the MCS could focus on DC, Maryland, Virginia and the Delmarva Peninsula, but stay on guard in Philly.
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