While a widespread severe weather outbreak is not expected in the Northeast, storms capable of causing disruptions and damage at the local level are likely Tuesday afternoon and evening.
People spending time outdoors or on the road should keep an eye out for rapidly changing weather conditions.
A mosaic of showers and thunderstorms will form during the midday and afternoon hours over the Northeast. A few of the storms will become severe, capable of producing frequent lightning strikes, moderate hail, damaging wind gusts and flash flooding.
Some neighborhoods will be hit with downed trees and power outages as well as street flooding and travel delays.
The greatest risk for these storms extends across Ohio, western and northern Pennsylvania, northern New Jersey, much of New York state, much of New England, southern Ontario and southwestern Quebec.
Cities that could be hit by a severe thunderstorm include Cleveland, Columbus, Pittsburgh, Scranton, Albany, Buffalo, New York City, Hartford, Boston, Burlington, Vt., Concord, N.H., Portland and Augusta, Maine, London and Toronto, Ontario, and Montreal, Quebec.
Storms will also fire farther south in the mid-Atlantic and Appalachians. While these are likely to much more widely separated, they can still briefly become severe.
Remember, if you can hear thunder, you are at risk for being struck by lightning. Move indoors as storms approach. Picnic pavilions and golf carts do not offer adequate protection from lightning.
In some cases the storms will be small in size, developing and dissipating rather quickly. In other cases the storms can organize into a squall line, move along for a few hours and cover a hundred miles.
Most of the storms will diminish soon after dark. However, in a couple of cases a complex of storms rolling in from the Midwest can survive well into the night.
Additional thunderstorms will fire through the remainder of the week. Thursday is the most likely day where an organized, broad area of severe weather occurs on the I-95 corridor from Washington, D.C., to New York City and Boston as the main batch of energy from the Midwest reaches the East Coast.
The frequency of thunderstorms, and especially downpours, will increase significantly during the coming weekend into next week and will raise concerns for flooding.
Travel hazards, delays and disruptions associated with rain, ice and snow will continue over the Central states through the balance of the Thanksgiving weekend.
Following a mild Thanksgiving and Black Friday, noticeably cooler air will return to the Northeast this weekend.
Sandra remains on track to make landfall in northern Mexico on Saturday, but it will be much weaker than its current hurricane status.
The current reprieve from heavy rain across southern India will not last long with the threat for flooding downpours set to return for the final days of November.
Wet weather with areas of ice and snow will stretch from Texas to Michigan and could impact shoppers and slow travel during Black Friday.
Several days of heavy rain will bring the potential to cause flooding from the southern Plains to the middle Mississippi Valley into early next week.
Nation devastated by terrible floods -- 400 people killed.
O'Fallon, MD (1990)
Strong downburst from a thunderstorm caused an apartment to collapse, injuring 25 people.
New England Coast (1898)
Famous "Portland" storm formed off Cape Cod with loss of 200 lives. Many others were lost to the raging sea in 50 small vessels. A total of 27 inches of snow in New London, CT; 15 inches at Waterbury, CT. Peak wind was 72 mph in Boston. Boston received more than a foot of snow.