While much of the nation from the Northern Plains to the Pacific Northwest has experienced hotter-than-normal weather this month, the Mid-Atlantic region has enjoyed a nearly normal month in terms of overall temperatures. In fact, it appears the last couple of days of July can include some below-normal temperatures in much of the Mid-Atlantic region and the first week of August could turn out to be cooler-than-normal in much of the eastern US. In addition to the potential for cooler-than-normal temperatures in the Mid-Atlantic region next week, we’ll have to watch out for the possibility of a coastal storm.
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The overall weather pattern across the nation over the next few days will feature upper-level ridging centered over the Northern Rockies and an upper-level low over southeastern Canada. As a result, it’ll be hotter-than-normal from the Northern Plains to the Pacific NW and the DC metro region should reach 90+ degrees over the next few days. Temperatures will trend downward as we head into the weekend and there are signs for some pleasant air next week as we begin the month of August.
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The north-central and northwestern parts of the nation will experience warmer-than-normal conditions this week as upper-level high pressure ridging intensifies over that region. In the Northeast US, the week will start off very warm with highs at or above 90 degrees through mid-week, but more comfortable air is likely to push here by the late week. Elsewhere, monsoonal moisture will continue to push into the “Four Corners” region of the Southwest US resulting in additional heavy rainfall for that part of the nation.
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A cool front passed through the region on Wednesday night and ushered in a more comfortable air mass for the latter part of July. In addition, the new air mass helped to “cleanse” the atmosphere of the smoke-caused haze that dominated the skies earlier in the week. Temperatures and humidity will remain on the bearable side for the next couple of days, but it’ll get hot and more humid for the Sunday-to-Tuesday time period and there will be an increasing chance of showers and storms.
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A cool front passed through the region last night and has ushered in a comfortable air mass for the latter part of July. Not only has the temperature and humidity dropped to more reasonable levels within this new air mass, the atmosphere has also been “cleansed” of the smoke-caused haze of recent days that was caused by wildfire activity in southern Canada. Decent temperatures will remain for Friday and Saturday and then it’ll turn hotter by early next week with an increased chance of showers and thunderstorms.
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The combination of an unstable air mass, surface frontal system, and an approaching upper-level trough is resulting in thunderstorm development across portions of the interior Mid-Atlantic at mid-day and some of these will make it into the I-95 corridor later this afternoon. Any afternoon or early evening thunderstorm can contain brief downpours, damaging wind gusts, hail and frequent lightning. The most unstable air seems to be situated over the Delmarva Peninsula and southern part of New Jersey and this zone can get especially hard hit later in the day with severe storm activity. The front should sweep away some of the haze that has been in the region during the past couple of days and it’ll be a refreshing day on Thursday with comfortable temperatures and humidity levels.
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The day begins with filtered-sunshine again as skies remain smoke-filled from wildfire activity across Canada and the NW US. A cool front will approach the region later in the day and bring with it an increased chance of showers and thunderstorms - some of the storms can be on the strong side. A comfortable air mass for late July will follow the passage of the frontal system resulting in a nice day on Thursday and it'll stay pretty comfortably warm around here on Friday and Saturday as well.
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Skies will be mainly sunny today in the Mid-Atlantic region, but the sun will be dimmed somewhat by smoke-filled skies that is coming from wildfire activity up in Canada and the sunset tonight could be quite "orange" if it isn't cloudy. A frontal system will arrive later tomorrow and it will raise the chance for showers and thunderstorms. Following the passage of the frontal system, high pressure from the Great Lakes region will slide towards the Mid-Atlantic and pretty comfortably warm air for late July will push in for the Thursday/Friday/Saturday time period.
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All in all, the coming week will feature seasonably warm temperatures for late July and plenty of sunshine on a daily basis. High pressure is in control as we begin the week and a frontal system will push through at mid-week. Following that mid-week frontal passage, another high pressure system will take control in the latter part of the week and likely stick around into the upcoming weekend resulting in more seasonal weather conditions for the DC metro region.
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A slow-moving frontal system to our northwest will inch its way into the Mid-Atlantic region this weekend and then grind to a halt. Low pressure will form along the stalled-out frontal boundary zone enhancing the chance here for showers and thunderstorms and some of the rain this weekend can be heavy at times. High pressure off the coast will resume control early next week and it'll stay on the warm, humid and unsettled side. Looking ahead, there are some favorable signs for a refreshing air mass to move into the northeastern part of the country by the end of next week or during the following weekend.
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