Rounds of rainfall to escalate flood concerns in eastern US this week

This weekend's rainstorm was only the start of an abnormally wet pattern that will elevate the flood risk in the eastern United States into the end of the month.

The rainstorm drenched northern Virginia and Maryland with 3-6 inches of rain on Saturday and Saturday night, which triggered flash flooding, stranded vehicles and prompted water rescues and road closures.

Baltimore smashed a 131-year-old rainfall record on July 21 as 4.79 inches fell. The previous record from 1887 was 2.76 inches.

On Sunday, the core of the rainfall will shift from New York state to southeastern Ontario, including Toronto.

Moisture will also stream into New England to close the weekend, threatening to delay the NASCAR race in New Hampshire, as showers and thunderstorms dot the mid-Atlantic.

Sun NE 7.22 AM

In the days following this rainstorm, residents should not expect a return of the dry weather that graced the region during the second half of last week.

"A cycle of daily rounds of showers and thunderstorms is likely to repeat on most days this week," AccuWeather Meteorologist Kyle Elliott said.

A stream of moisture from the tropical regions of the Atlantic Ocean will be directed at the East Coast for much of the week, leading to days of downpours, travel delays and ruined outdoor plans.

Early Week outlook 7.22 AM

Rainfall amounts are likely to run well above normal during this time frame, according to Elliott.

On average, most areas in the Northeast pick up 3-4 inches of rainfall during the month of July. However, some places in the mid-Atlantic have already received two times these amounts during the first three weeks of the month.

Further rainfall will struggle to soak into the ground that is already saturated, heightening the risk of flash flooding, rising streams, and rivers that can overflow their banks and road washouts and closures.

"The pattern may escalate into a serious flood threat for some communities this week," AccuWeather Senior Meteorologist Alex Sosnowski said.

Rainfall may be enhanced over the Appalachian Mountains during the early and middle part of the week, bringing a heightened risk of mudslides to this region.

East Downpours 7.22 AM

People with plans to camp or hike along the mountain range will need to keep close tabs on the weather situation this week.

Motorists may face slower travel times on the roadways as a result of the downpours.

Airline passengers traveling into and out of the major East Coast hubs should be prepared to face an uptick in weather-related delays.

Despite the setbacks, the pattern may completely wipe out the pockets of abnormally dry to moderate drought conditions from the Carolinas to New England.

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WASHINGTON, D.C. - JULY 17: A person makes their way out of the rain before the 2018 All-Star Game at Nationals Park on Monday, July 17, 2018. (Photo by Salwan Georges/The Washington Post via Getty Images)
NEW YORK, USA - JULY 17: People walk over a pedestrian crossing with their umbrellas on a rainy day in New York, United States on July 17, 2018. (Photo by Atilgan Ozdil/Anadolu Agency/Getty Images)
NEW YORK, USA - JULY 17: People walk over a pedestrian crossing with their umbrellas on a rainy day in New York, United States on July 17, 2018. (Photo by Atilgan Ozdil/Anadolu Agency/Getty Images)
A delivery person rides a bike during a heavy midday downpour in Times Square in New York City, U.S., July 17, 2018. REUTERS/Brendan McDermid
#Breaking: 20 plus vehicles with water up to their doors on GW Pkwy at Reagan Airport. Avoid GW PKWY!!! https://t.co/61BaHuyroQ
Gorgeous new water fixture at Times Square @NYCTSubway https://t.co/p7x3wUkizP
#BREAKING - Serious flash flooding happening right now in Worcester. Video from Juan Ortiz. #7News https://t.co/TTRzB8M9di
These photos show just how bad the flooding was in Worcester today. https://t.co/Xit1OOqHuN https://t.co/KbojkjbTVr
WASHINGTON, D.C. - JULY 17: A general view of Nationals Park during a rainstorm prior to the 89th MLB All-Star Game on Tuesday, July 17, 2018 in Washington, D.C. (Photo by Adam Glanzman/MLB Photos via Getty Images)
WASHINGTON, DC - JULY 17: Scene through a damp car window, a woman carries an umbrella in the rain along 12th Street NW on Tuesday July 17, 2018 in Washington, DC. (Photo by Matt McClain/The Washington Post via Getty Images)
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"While the pattern may not bring rain every day everywhere, people may get frustrated by the frequency of showers and thunderstorms as far as outdoor plans, sporting events and construction projects are concerned," Sosnowski said.

After a damp start to the week, a wedge of dry air set to overtake eastern New England on Tuesday and Wednesday is expected to keep the region drier than most locations in the Northeast.

Downpours will take aim farther west from the Carolinas to New York state on these days.

Late in the week, enough dry air may envelop the aforementioned corridor to limit the number of downpours compared to days earlier in the week, while also pushing the heaviest rain into New England.

AccuWeather Lead Long-Range Meteorologist Paul Pastelok expects the wetter-than-normal pattern to continue for much of the East right into the start of August.

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