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.
Tropical Storm Hermine will turn toward Florida with heavy rain, gusty winds and the risk of flooding into Friday.
Another strong tropical disturbance has moved off the coast of Africa and bears watching for strengthening and impact on the Caribbean and the United States during September.
A swarm of tropical systems cruising the Atlantic Ocean will raise surf and risks to beachgoers along the East coast of the United States into Labor Day weekend.
Two tropical systems, Madeline and Lester, could pose hazards to Hawaii into Labor Day weekend.
Though the summer season is winding down, forecasters are predicting a warm start to fall across the Northeast — a weather pattern that could spell bad news for fall foliage lovers.
While warmth will dominate much of Asia this autumn, drought relief is on the way for southeastern areas, but tropical cyclones could threaten lives and property surrounding the Bay of Bengal.
Yuma, AZ (1950)
123 degrees - hottest temperature ever in Yuma. Yuma is the hottest city in the U.S.
Los Angeles, CA (1955)
110 degrees, hottest day ever in September. This mark was tied September 4, 1988.
Milwaukee, WI (1988)
Hottest summer on record. Six days of 100 degrees or greater and 36 days of 90 or above. Average temperature of 73.8 beat the old record of 72.8 set in 1921 and 1955. The normal average tempera- ture for a summer in Milwaukee is 68.3 degrees.