The mild pattern has come to end in the Pittsburgh area.
Temperatures will fall back into the upper 20s on Monday but conditions turn breezy and colder Tuesday night with a low in the lower teens.
AccuWeather RealFeel® temperatures will be below zero at times between Wednesday and Thursday.
The cold wave will break by Saturday with a high in the low 40s under a mix of clouds and sun.
A tropical wave is likely to become the Atlantic Basin's next tropical storm as it approaches or crosses the Caribbean Sea later this week and potentially pose eventual threats to North America.
Fall air has finally arrived in the northeastern United States and may yield the first frost of the season in parts of the region to end this weekend.
Typhoon Megi will continue to strengthen before threatening lives and property across Taiwan and eastern China this week.
Bouts of heavy rain and thunderstorms will continue to soak portions of Texas into Monday night, further heightening the risk of flooding.
Wintry weather marked the first days of autumn across parts of the Mountain West as snow mixed in with the changing fall foliage.
Gusty winds will accompany a push of chilly air across the Great Lakes from Sunday night through Tuesday.
Washington, D.C. (1975)
Last of nine straight days with some rain. Total rainfall of 9.86 inches; total for September 1975 was was 12.36 inches.
Cape Hatteras, NC (1989)
Rained every day from the 12th to the 25th for a total of 15.51 inches. Normal for all of September is 5.78 inches.
Portland, ME (1991)
Record combined August-September rainfall of 19.65 inches up to Sept. 25. Old record was 14.65 inches in August-September 1954.