After a beautiful weekend, a bout of drenching thunderstorms will lead to a threat for flash and urban flooding.
Showers and thunderstorms will be heavy at times into Tuesday evening. Rainfall amounts over 1.00 inch have already been reported in the Washington D.C. area, especially south and east of the city.
Further northeast, more than 5.00 inches of rain has been reported at Baltimore-Washington International Airport. Also traffic through Harbor Tunnel has been delayed due to flooding.
The evening commute Tuesday could be very difficult, especially if folks are traveling northeastward. Commuters may even have to dodge some detours around any localized flooding problems that develop.
Following the threat for heavy rainfall, drier air will build in later Tuesday night into Wednesday with nothing more than a spotty shower.
Cooler and less humid air will follow for Thursday and Friday with high temperatures below normal, in the lower 80s.
Matthew has become a hurricane in the Caribbean and may approach the U.S. during next week.
It will feel like an extended winter for those living from the northern Plains to the eastern U.S., as cold and snowy conditions last longer than normal.
Persistent downpours will raise the flood risk in part of the mid-Atlantic into Friday, while rain will spread over the balance of the northeastern United States into the weekend.
Millions of people across the U.S. could be exposed to drinking water contaminated with chemicals from firefighting foam, according to a recent study.
The final day of September will bring a rare lunar event that hasn’t occurred since March of 2014, a Black Moon.
The holiday weekend will start on an unsettled note, but the weather should improve by Day of German Unity celebrations on Monday.
U.S./Quebec border (1835)
Heavy snow; Hatley, P.Q. received 10 inches. Kelkenny, NH had 6 inches.
San Diego, CA (1970)
Strong Santa Ana winds create fire disaster in interior parts of county (September 25 to 30); 500,000 acres burned.
Lander, NY (1982)
15.4 inches of of snow (29th-30th). Total of 32.9 inches for month (Sept. record).