A storm with tropical origins will bring the potential for flooding and damaging winds along the East coast spanning Saturday into Monday. An area of showers and thunderstorms continued to gather along the coasts of Nicaragua and Honduras late this week. The storm will accelerate northward on a path that roughly parallels the southern Atlantic coast of the US on Sunday, prior to moving northward across New England Sunday night and Monday.
As the storm continues to gather moisture and strength, locally severe thunderstorms may accompany torrential downpours in southeastern and central Florida and the northwestern Bahamas on Saturday and Saturday night. How strong the storm becomes will determine the severity of the weather conditions not only in Florida but also further north along the Atlantic coast.
This storm will pack a punch in terms of the consequences of heavy rainfall and gusty winds in a large part of the northeast later this weekend into the start of the new week. The greatest risk of urban flooding and damaging winds will extend from North Carolina to New Jersey, eastern Pennsylvania and New York and of course much of New England.
These areas are likely to receive between 2 and 6 inches of rain in 12 to 24 hours. Much of the rain may fall in 6 to 12 hours. Locally higher amounts are possible. WInds, seas, and surf will kick up as the storm moves northward. Wind gusts can be close to hurricane force (74 mph) along the coast of New England later Sunday night and Monday.
Isolated incidents of urban flooding can occur farther west as well, but it won’t be from the storm on the Atlantic coast. Cooler air will trigger downpours and isolated thunderstorms from the Ohio and Tennessee valleys on Saturday and will move into the central and southern Appalachians and eastern Great Lakes on Sunday. As the cold air enters these areas, wet snowflakes may mix in over the higher elevations of West Virginia, Maryland, Pennsylvania and New York state by Monday.
This arrival of cooler air will mark an abrupt end to the rain on Sunday in the southeastern states, and Sunday night in much of the mid-Atlantic and on Monday in New England.