A batch of heavy rain and thunderstorms will bring the risk of urban and flash flooding, as well as travel delays into Tuesday night along much of the Atlantic Seaboard.
The downpours can be heavy enough to not only bring street and catch basin flooding, but may also greatly lower the visibility.
Poor visibility and locally severe thunderstorms in the heavily-concentrated airport zone of the Atlantic Seaboard could lead to widespread flight delays within the region and possibly ripple-effect implications elsewhere in the nation.
The storm system dumped up to 6 inches of rain and has a history of flash flooding in Tennessee to start the week.
Cities that will be impacted by the heavy rain and related issues into Tuesday night include Raleigh, N.C.; Richmond, Va.; Hagerstown, Md.; Philadelphia and Harrisburg, Pa., Washington, D.C.; Baltimore; Wilmington, Del.; New York City and Albany, N.Y.; Hartford, Conn., and Boston.
Enough rain can fall at a fast enough pace to cause rapid rises on small streams in hilly terrain areas anywhere along the Atlantic Seaboard.
The system is forecast to bring a general 1.00 to 2.00 inches of rain with the potential for 4.00 inches or more in a few locations. Much of the rainfall will occur over an 8- to 12-hour period. A few locations along the East Coast can receive an inch of rain in an hour's time.
A system responsible for heavy rain in the South Central states over the weekend will join forces with a front approaching from the Upper Midwest and moisture from the Gulf of Mexico and the Atlantic Ocean.
During the second half of the week, high pressure will return to the region with sunshine.
**However, locally dense morning and midday fog could become a travel problem Thursday and Friday, after cool winds subside.**
This story was originally published at 10:00 a.m. EDT, Monday, Sept 18, 2012 and has been updated.
A pair of tropical lows will strengthen as they approach Queensland in the coming days.
A drier and warmer stretch of weather is in store for the U.K. after a stormy February that resulted in flooding.
The main weather concern to search crews through Monday in the vicinity of where the Malaysia Airlines Boeing 777 lost contact will be building seas.
"We exchanged notes already pledging to work together for the common good of the weather enterprise and the nation," AccuWeather CEO Barry Myers said.
Springlike warmth will pour from the Plains to the East over the next few days before a potential winter storm unfolds at midweek.
The long-lasting and relentless winter season has broken seasonal maintenance expenditure records across much of the U.S.
Philadelphia, PA (1960)
Record low of 14 degrees -- 2nd day of 3 consecutive record lows, and 1 of 4 set during March 1960.
Dallas-Monroe Co. AR (1909)
Tornadoes killed 64 and injured 671.
Brinkley, AR (1909)
Tornado killed 49 and caused $600,000 worth of property damage.