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First frost possible during overnight chill in DC area’s northern, western suburbs

Grab your jacket — D.C.-area residents may wake up to witness their first frost of the season Sunday morning after this fall’s chilliest night so far. Frost could develop in the northern and western suburbs of the D.C. region as temperatures dip overnight Saturday.



Areas farther out west, including the Allegheny and Shenandoah valleys, will be under freeze warnings as until the later hours of Sunday morning.

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The frost is a product of multiple factors, according to Storm Team4 meteorologist Chad Merrill: clear skies, calm winds, dry air and moisture on the ground. He added that parts of the region immediately around the Capital Beltway and east of Interstate 95 won’t see any frost, but temperatures hovered around 40 overnight. After the morning chill Sunday, highs will drift into the mid to upper 60s before temperatures go back into the 70s through most of the week until a rain front passes through Thursday.

Forecast

Sunday: Warmer. Highs near upper 60s. Monday: Mostly sunny. Highs in upper 60s. Tuesday: Sunny. Highs in lower 70s.

Hot, humid week ahead for DC area with severe storm risk

A dangerous heat wave will grip the D.C. area through Thursday, with highs in the mid to upper 90s and heat index values between 100 and 105. Hot and humid conditions are expected through Thursday, according to the National Weather Service, which said to expect daily thunderstorm chances and a risk of severe thunderstorms. 7News Meteorologist Eileen Whelan told WTOP that most of Tuesday will stay dry, but a few late-day thunderstorms are possible, especially north and east of D.C. as storms drift south from Pennsylvania. Any storm could produce damaging wind gusts and hail, but Whelan reiterated "storm chances are low" on Tuesday. Due to a lack of air conditioning, Parkdale High School in Riverdale, Maryland, closed early at 10:30 a.m. on Tuesday, Prince George's County Public Schools said in a social media post.
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