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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High pressure off the east coast that has been in control of the overall weather pattern around here for several days will begin to break down as we head to the weekend. A slow-moving frontal system to our northwest will inch its way into the Mid-Atlantic region this weekend and then stall out. Low pressure will form along the stalled-out frontal boundary zone over the weekend enhancing the chance for showers and thunderstorms and some of the rain can be heavy. 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 following weekend.
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High pressure remains anchored off the east coast and will continue to push warm and humid air into the Mid-Atlantic region. A frontal system will approach the area later today and the result will be yet another chance of late day and evening showers and thunderstorm and any storm that forms can produce heavy rainfall. The high pressure system over the western Atlantic will tend to breakdown later this week and another disturbance is likely to increase the chance for rain at week’s end and going into the weekend. There is a chance that some of the rain that falls this weekend can be on the heavy side.
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The rest of the week looks very warm, humid and quite unsettled in the eastern half of the nation which will contain additional chances of showers and storms for the Mid-Atlantic region. There will be a couple of frontal systems to deal with over the next few days, but the main player will be strong high pressure over the western Atlantic which will pump in very warm and humid air to the region on a continuous basis. Temperatures will climb into the 90’s each day this week and high dew points will continue to make for quite uncomfortable conditions.
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We have certainly heard this warning multiple times this spring and summer…”the potential exists for strong-to-severe thunderstorm activity in the DC-to-Philly-to-NYC corridor and any storm can produce heavy rainfall, frequent lightning and damaging wind gusts”. In fact, the overall weather pattern will remain on the wet side through the remainder of the week across the eastern half of the nation including in the DC, Philly and NYC metro regions with multiple chances of additional showers and thunderstorms.
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