While the severity and path of the storm grabbing attention is still questionable, the impact would span Monday and Tuesday in central Pennsylvania.
How nasty the weather gets, if nasty at, all depends on the track and strength from Sandy, a hybrid storm, a nor'easter or a simple frontal passage.
In the worst-case scenario, an intense storm, turns inland from the Atlantic Ocean over New Jersey and Pennsylvania early next week.
Such a scenario would deliver high winds, heavy rain and perhaps high-elevation snow. Impacts would range from travel disruptions and foiled activities to downed trees, power outages and flash and urban flooding.
If the storm fails to turn westward over the region, a period or two of rain would occur Saturday night into Monday. Snow showers could occur over the mountains by early next week with noticeably blustery, progressively colder conditions for all.
Strong thunderstorms are impacting areas from Texas to Louisiana with large hail, damaging winds and a risk of tornadoes.
Severe storms, some capable of producing tornadoes, will threaten communities across northeastern Texas, northwestern Louisiana and Arkansas into Tuesday night.
The same storm system responsible for producing violent thunderstorms in Oklahoma recently will reach the Atlantic Seaboard Thursday.
While additional strong thunderstorms will roll through through portions of tornado-ravaged Oklahoma Tuesday, the risk of tornadoes has diminished.
The atmospheric severe weather engine began firing on all cylinders this past weekend and reached full speed Monday over Oklahoma.
Preliminary reports are calling it an EF-4 tornado that has caused numerous fatalities and injuries in Moore, Okla.
Lewistown, ME (1911)
101 degrees -- hottest ever in New England during May.
Southwestern & Central OK (1996)
Sinking air from dying thunderstorms cause unusual late night rise in temperature. Many places rose from upper 80s at 11:00PM to near 100 degrees by 3:00AM.
San Antonio, TX (1998)
Very dry since April 1st - only 0.05 of rain.