The Washington Post

PM Update: Risk of heavy rain, flash flooding Friday

Friday morning brings the beginning of autumn, but we’ll sure be missing the cool, crisp, clear fall air. Instead, humid, tropical air from the south primes the atmosphere for periods of heavy rain. Given the soaked ground from recent rains, it won’t take that much water to cause flooding and a flash flood watch is in effect everywhere but the far southwest suburbs Friday.

Through Tonight: A few widely scattered showers are possible this evening, mainly southeast of town. As the night wears on, showers generally increase in coverage and intensity, and at least intermittent showers are likely by morning. Lows are warm, ranging from 65 in the cooler suburbs to near 70 downtown.

Friday: Periods of rain showers and possible thunderstorms are likely. Some of these rain showers may be heavy and “train” over the same areas, leaving open the possibility of flash flooding. The heaviest rain may set up along and/or east of I-95 Rainfall totals are likely to be highly variable, averaging about 1”, but may exceed 2-3” in some locations. It remains cloudy, warm, and humid, with highs in the mid-to-upper 70s.

See David Streit’s forecast through early next week. And if you haven’t already, join us on Facebook and follow us on Twitter

Pollen update from Walter Reed: Most counts are missing or incomplete due to rain, but mold spores are HIGH.

Jason is the Washington Post’s weather editor and Capital Weather Gang's chief meteorologist. He earned a master's degree in atmospheric science, and spent 10 years as a climate change science analyst for the U.S. government. He holds the Digital Seal of Approval from the National Weather Association.

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