The next few days will bring some of the warmest conditions so far this year into the DC-to-Philly-to-NYC corridor including the first 90 degree readings in some spots and possible record-breaking high temperatures. This warm spell does not, however, mark the end of the cool air outbreaks for the eastern US and there are signs for fairly sustained cooler-than-normal period as we head into the Memorial Day weekend.
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A surge of very warm air will push temperatures to or slightly above the 90 degree mark later today and tomorrow afternoon – perhaps even to record high levels in some spots on Thursday. It’ll stay quite warm on Friday as well with highs well up in the 80’s to end the work week, but there is relief coming this weekend as a classic back door cold front pushes through the region. This front will bring about a low-level wind shift from southwest to northeast – and that would bring much cooler air into the region from the still-chilly waters of the western Atlantic Ocean. Temperatures this weekend are likely to be held to near 70 degrees for highs on both days. On Monday, a strong cold front is liable to produce showers and thunderstorms up and down the I-95 corridor as it pushes in from the Ohio Valley. Looking elsewhere, while the eastern states experience a surge of very warm air, cold air for this time of year is plunging into the western US and there may actually be a foot or more of snow in Denver later in the week.
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After a long stretch with primarily cooler-than-normal conditions, summer will explode onto the scene over the next couple of days and 90 degrees may be within reach in the NYC metro region on both Wednesday and Thursday afternoons. It'll stay quite warm on Friday and then temperatures will slide back this weekend following the passage of a weak frontal system and the building of high pressure across the Northeast US. Looking ahead, there will likely be more cool shots for the Northeast US as we progress through May. In fact, there are early signs for a decent cool shot to arrive here during the Memorial Day weekend.
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Summer explodes onto the scene by mid-week! The deep and slow-moving upper-level low pressure system that helped to spawn the early weekend coastal storm and the late weekend unsettled weather conditions will push off the Northeast US coastline over the next couple of days. As a result, much warmer air will advance northeastward from the southern states over the next couple of days and temperatures around here should reach well into the 80’s on Wednesday and Thursday - perhaps even 90 degrees in a few spots.
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Low pressure will move along a frontal boundary zone later today and intensify into a significant storm by later tomorrow along the Mid-Atlantic coastline as a pair upper-level lows slowly phase together right on top of the region. This coastal storm will produce a soaking rainfall for the NYC metro region from late tonight through tomorrow night and temperatures will remain well below normal for this time of year. While there will be some slight improvement on Sunday as the surface storm heads into New England, the atmosphere will remain quite unstable around here with cold air aloft associated with a deep upper-level low. This instability should lead to numerous (cumulus) clouds and occasional showers are likely on Sunday. In addition, Mother’s Day will remain quite cool for this time of year and the wind will be quite noticeable on the back side of the storm. Looking ahead, much warmer air is likely to blast into the Mid-Atlantic region by the middle of next week. At the same time, very chilly air will dive into the western US and this combination of warm air to the east and cold air to the west could lead to a major severe weather outbreak in the central Plains come mid-week.
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A significant coastal storm will produce heavy rain in the area as we head into the Mother’s Day weekend. Low pressure will form tomorrow in the eastern US and then track along a frontal boundary zone towards the Mid-Atlantic coastline while intensifying. There could be some light shower activity during the day on Friday, but a soaking rain is likely from tomorrow night into Saturday night as a result of the strong coastal storm. Sunday, Mother’s Day, will feature slight improvement, but lingering showers will still be possible and it will remain on the cool side of normal. Much warmer weather will blast into the Northeast US by the middle of next week.
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Ingredients are coming together for a significant coastal storm in the Mid-Atlantic region as we begin the Mother’s Day weekend and it is likely to bring a soaking rain to the DC-to-Philly-to-NYC corridor from late Friday into late Saturday.
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A significant coastal storm is looking increasingly likely for the NYC metro region on Friday night and Saturday. Low pressure will form in the eastern US at the end of the week and likely track along a frontal boundary zone right towards the Mid-Atlantic coastline. There can be some shower activity ahead of the storm late Thursday night and Friday, but the main action from the storm around here should be on Friday night and Saturday. Throughout the weekend and right into the early part of next week, temperatures around here should remain at below-normal levels for this time of year.
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Nearly stationary and strong low pressure in the upper part of the atmosphere continues to dog the Northeast US with cool and rather unsettled conditions. This system will make an attempt to move to the east of here over the next couple of days, but another upper-level low will re-energize this nearby one and the result will be much of the same by the weekend with abnormally low heights for this time of year in the upper-levels over the northeast part of the country. As this re-energizing of the upper-level low takes place later in the week and this weekend, a coastal storm is likely to form and it could produce showers in the I-95 corridor.
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Strong low pressure in the upper part of the atmosphere will meander around the Northeast US over the next few days and keep us quite cool for this time of year. The upper-level low will try to push away at mid-week, but another upper-level low will get absorbed and this will re-energize it later in the week. The end result of all of this is that deep upper-level low will return to the Northeast US by the weekend and this could spawn another low pressure system to form near the coastline.
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