Vigorous upper-level low pressure will sit and spin over the Northeast US during the next few days – much like the pattern we experienced in May – and this will lead to cooler-than-normal conditions and occasional showers. In fact, temperatures on Wednesday and Thursday will struggle to reach the 70 degree mark for highs and this is well below normal for early June. There are signs, however, for a significant warm up this weekend into early next week resulting in temperatures well up in the 80’s by Sunday afternoon.
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The first half of the work week will be unsettled with occasional showers and possible thunderstorms as deep upper-level low spins over the Northeast US. It’ll turn noticeably cooler by mid-week with temperatures becoming well below-normal for this time of year. High pressure will build back in during the latter part of the week and we'll turn quite warm again over the upcoming weekend. In fact, temperatures could take a run at 90 degrees for highs on Sunday afternoon in parts of the I-95 corridor region from DC-to-Philly-to-NYC.
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A weak disturbance will cross the region later today and while it could generate an isolated shower or thunderstorm, it does not look like a significant precipitation event by any means. High pressure will build back into the region on Saturday and the weekend will start off quite nice with dry, warm conditions and afternoon highs near 80 degrees. However, moisture from the Great Lakes will drop from the northwest-to-southeast later in the weekend and likely reach the I-95 corridor in the form of showers by late Sunday. Once those showers arrive, it looks like they’ll stick around going right through Monday and perhaps even into Tuesday as strong upper-level low spins over the Northeast US for a few days. Cooler-than-normal conditions are likely here for Tuesday and Wednesday of next week and there will likely be additional cool air outbreaks for the Mid-Atlantic region as we progress through the first half of June.
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There will be a break in the action today from the recent active weather pattern with plenty of sunshine and warm temperatures climbing towards the 80 degree mark. Another frontal system will approach on Friday and this could bring widely scattered showers and thunderstorms to the region later in the day or early at night. The weekend will begin on the dry and warm side, but showers are likely from later Sunday into Monday. Cooler-than-normal conditions are likely in the Mid-Atlantic region by the middle part of next week.
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May is very likely to end up cooler-than-normal in the I-95 corridor region from DC-to-Philly-to-NYC and it looks like the same overall pattern will continue through the middle of June. Upper-level low pressure has dominated the scene in the Northeast US during the past several weeks and there are signs that this scenario will continue for awhile longer and contribute to more cool air outbreaks and more rain events. Another contributing factor to the cooler-than-normal weather in this region is the "soil moisture" which is quite high given all the recent rainfall and this scenario shows no sign of changing significantly anytime soon.
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An unsettled weather pattern will continue in the Mid-Atlantic region right through the upcoming weekend, but there will be some nice spells as well with, for example, Thursday likely to be quite a nice day. For today, a cold frontal system will arrive tonight from our west and there is a chance of late day or evening showers and thunderstorms. On Thursday, skies should become mainly sunny after some possible early day patchy fog. Sunshine may begin the day on Friday, but showers and storms are possible again late in the day and especially at night. The weekend starts off with decent weather on Saturday, but rain is likely on Sunday and it'll turn cool again early next week. One final note, the NASA/Wallops sounding rocket launch has been postponed until early tomorrow morning.
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It looks like another week without any real hot weather for the Mid-Atlantic region as we end May and begin the month of June In fact, the temperatures should hold at or below the 80 degree mark for highs for the next few days, but perhaps we'll reach into the low-to-mid 80's later in the week. One frontal system will be nearby today and keep us unsettled and then additional fronts will swing through over the next several days keeping us unsettled.
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A mixed picture for the holiday weekend with plenty of rain-free time, but cannot rule out showers or thunderstorms on any of the three days. Low pressure in the upper atmosphere will pull away later today, but it'll remain unstable enough for a possible passing shower or two this afternoon. A frontal system will stay close enough this weekend to generate the chance of showers or thunderstorms on each day, but no day will be a total washout and there will be lots of rain-free time
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Ingredients are coming together for a severe weather threat late today/early tonight in the Mid-Atlantic region extending from the Philly and DC metro regions on the west side to southern New Jersey and the Delmarva Peninsula on the east. Vigorous upper-level energy will swing from southwest-to-northeast and across the region late today/early tonight and that will cool off the upper part of the atmosphere. This upper feature will combine with increasingly warm and already-moist low-level air to destabilize the atmosphere significantly late today/early tonight which will allow for the possibility of severe thunderstorm activity.
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Another vigorous upper-level low is bringing more wet weather to the Mid-Atlantic region and the threat for showers will continue into tomorrow. Scattered thunderstorms can mix into the picture as well and some storms that do form this afternoon/evening can be on the strong side. There will be some improvement on Saturday, but this will be just another short-term break in the action during this very active weather pattern. Showers will threaten later Saturday, Saturday night, Sunday and Monday as a frontal boundary zone cuts right across the Mid-Atlantic region and there can be a few thunderstorms mixed in as well.
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