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Miserable heat and humidity in DC forecast

Enjoy Wednesday, because the rest of the week will be hot and humid, with a heat index that could surpass 100, and a chance for rain.

The threat of Hurricane Laura is increasing, with the storm expected to become a “catastrophic” Category 4 hurricane, even stronger than previously expected.

“Thursday and Friday will both be miserably hot and humid again,” NBC Washington Meteorologist Chuck Bell said.

Thursday will have the higher temperatures. Friday will have the higher humidity.

Highs on Thursday will be in the mid-90s, but the heat index could reach 100 to 104.

“The high clouds from Hurricane Laura will begin to arrive on Friday and should hold temperatures down a few degrees, but the increasing levels of tropical levels of humidity will offset any ‘cool down,'” Bell said.

The hurricane is expected to reach the Gulf Coast on Wednesday night and, while it will no longer be a hurricane, its cloud circulation is likely to be near Roanoke, Virginia, by noon on Saturday.

“Rainfall in our area could also be quite heavy with local amounts of 2 to 3 inches — the heaviest rain coming Saturday night,” Bell said. “Our waterlogged soil ahead of the storm means that flash flooding will be a concern from 2 p.m. Saturday until around sunrise on Sunday.”

The good news? A large area of high pressure dropping south from Canada will help make sure tropical downpours don’t hang around too long.

Current conditions

Forecast

Wednesday: Mostly sunny, much lower humidity. Seasonably warm. Highs: 83 – 88.
Wednesday night: Partly cloudy, comfortable. Isolated shower possible. Lows: 65 – 72.
Thursday: Partly to mostly sunny. Hot, humid and breezy. Afternoon Heat Index near 100 – 104. Isolated afternoon storm possible. Highs: 92 – 97.
Friday: Increasing clouds. Hot and humid with scattered afternoon rain/thunderstorms. Highs: 89 – 94.
Saturday: Mostly cloudy. Very humid. Showers likely before 2 p.m. Heavy rain possible by the evening, with the risk of flash flooding overnight. Highs: 80 – 86.

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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