People in central Pennsylvania will be hit with damaging wind and flooding rainfall from Sandy through Tuesday.
In the Keystone state and over much of the Northeast, the storm will threaten lives and property and will bring widespread travel disruptions.
Sandy is forecast by AccuWeather.com to make landfall near Atlantic City, N.J. Monday evening and to push inland over Pennsylvania late Monday night and Tuesday. However, effects from the powerful and massive storm will precede landfall, while impact will linger for days after the storm's demise.
The worst conditions will occur locally late Monday night into Tuesday.
Since Sandy is such a large storm in terms of surface area, effects will be more than a small category 1 or 2 hurricane hitting the coast or a nor'easter.
According to AccuWeather.com CEO Barry Myers, "Sandy is a hurricane wrapped in a winter storm."
There will be major impact due to wind and flooding as far north as portions of New England and as far south as Washington D.C. and Norfolk, Va. and as far west as the Great Lakes.
At this time AccuWeather.com meteorologists expect wind gusts in the neighborhood of 50 to 60 mph in central Pennsylvania. Gusts can be higher over the ridges, on top of buildings and through the gaps in the mountains.
Gusts this strong will down trees, power lines, send loose objects airborne and cause minor property damage.
Avoid walking or parking under trees as large limbs can come down with no notice.
The heaviest rainfall, a general 4 to 8 inches, is projected to fall over central Pennsylvania over a several-day period through Wednesday. The greatest amount of rain is likely to fall over northern Maryland and southern Pennsylvania. Flooding of the Potomac River mid- to late-week is likely as a result.
Enough rain will fall in the local area to raise the risk of flash, urban and stream flooding. Fallen leaves will block storm drains adding to the potential for street flooding.
Heavy snow will fall over the high ground in West Virginia and south central Pennsylvania.
While downpours could come calling at the start and finish of the July Fourth weekend in the northeastern United States, the vast majority of the time will be dry.
Rain and thunderstorms will threaten parades, barbecues and fireworks displays across portions of the central and eastern United States and the Intermountain West on Independence Day.
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Boston, MA (1982)
Second wettest month in 168 years of records (2016 months) June 1982: 13.5", 4" above the all time June record. Wettest month: August 1955, 17"; a foot of that was from Hurricane Diane.
Fresno, CA (1982)
The first time it has rained on June 30th since records have been kept (1888). (0.23" of rain).
Baton Rouge, LA (1989)
22.80" of rain for the month of June.