In the wake of heavy rain and gusty thunderstorms Monday, much cooler weather will follow for the balance of the week around Philadelphia.
Much cooler and less humid air is in store for the region Monday night through Friday, marking an end to nearly a week with daytime highs in the 80s.
Normal temperatures this week range from highs in the upper 60s to near 70 with night time lows near 50. Temperatures will be near to slightly above average, but 15 to 20 degrees lower than much of the past week.
Lingering moisture, some of which is associated with Tropical Rainstorm Karen will be watched for possible impact later in the week.
A storm system will form along the mid-Atlantic coast as early as Wednesday.
Rain could creep back in on one or more occasions during the second half of the week. Even if rain does not make the trip in from the Atlantic, there will be episodes of clouds.
Tropical Depression Eight could become a tropical storm while brushing the North Carolina coast with rough surf, downpours and locally gusty thunderstorms early this week.
Following several stretches of unseasonable heat in August, September is set to yield lower temperatures across the United Kingdom.
Tropical Depression Nine developed just south of Florida on Sunday and will turn toward the northeastern Gulf Coast of the United States later this week.
Another strong tropical disturbance will move off the coast of Africa early this week and bears watching for strengthening and impact on the Caribbean and the United States during September.
Typhoon Lionrock is poised to make landfall in Japan on Tuesday afternoon local time with heavy rainfall, damaging winds and an inundating storm surge.
Following a stormy weekend across Germany, a period of dry and more seasonable weather is in store this week.
Anchorage, AK (1989)
A total of 9.6 inches of rain -- wettest August on record.
New England (1816)
"Year in which there was no summer", otherwise known to weather historians as "1800 and frozen to death" killing frost once again damages sparse corn corp in northern New England...loss of this and other crops led to severe famine in much of New England that winter...and helped spur western migration in spring of 1817.
New England (1965)
A total of 2.5 inches of snow on top of Mt. Washington set an August record. Vermont had a reading of only 25 degrees, while Nantucket had a chilly 39 degrees. Earliest freeze on record at many stations.