Powerful Storm to Bring Rain, Winds to Northeast Before Fall Freeze

A powerful storm system is forecast to sweep through the Great Lakes region on Thursday before bringing a significant rainfall and wind event to the Northeast on Friday. Following the storm, the coldest temperatures of the season are expected to arrive this weekend, with the potential for the first snow of fall in higher elevations.

The storm system, initially anticipated to intensify significantly off the New England coast, is now not expected to meet the technical definition of bombogenesis, which requires a pressure drop of at least 24 millibars in 24 hours. However, coastal areas of New England could still experience wind gusts between 30 and 40 mph, with isolated gusts reaching up to 50 mph, alongside hazardous maritime conditions. Stronger wind gusts are anticipated further north, near Nova Scotia and Newfoundland.

Storm System Moves Through Great Lakes

On Thursday, the storm will track across the Midwest and Great Lakes. Cities such as Chicago, Milwaukee, and St. Louis will see rain begin in the morning, while areas including Detroit, Cleveland, and Indianapolis will experience rain in the afternoon or early evening. Rainfall amounts are generally expected to be under an inch, mitigating widespread flooding concerns. The National Oceanic and Atmospheric Administration (NOAA) has issued a Level 1 out of 5 risk for severe thunderstorms along a corridor from St. Louis through central Illinois and Indiana to Cleveland.

Friday Washout for the Northeast

Rain is expected to reach the Northeast, including the I-95 corridor, by Friday morning, potentially impacting the morning commute. The storm is predicted to strengthen throughout the day, with wind gusts ranging from 25 to 40 mph anticipated across the region, affecting cities like Boston and New York City. A Level 2 severe thunderstorm risk has been identified for parts of eastern Pennsylvania, northern Maryland, and New Jersey along the Pennsylvania border. Damaging wind gusts are the primary concern, though the possibility of a tornado or two exists. Heavier downpours are expected to continue into Friday evening, with accumulations of up to an inch of rain north of the Interstate 90 corridor by Friday night. The storm is expected to weaken late Friday.

Weekend Temperature Drop

Following the storm's passage, a surge of cold air is expected to arrive, marking a sharp contrast to the recent record-setting heat in the eastern United States. Interior valleys in Pennsylvania, along with parts of Upstate New York and Northern New England, could see overnight low temperatures drop into the upper 20s and low 30s over the weekend. Higher elevations in the Adirondacks, Green Mountains, and White Mountains may receive 1 to 3 inches of snow by Saturday night. Areas in the Ohio Valley, Northern New Jersey, and New York’s Hudson Valley might experience their first frost of the season. Breezy conditions are expected to persist through Saturday.