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 DC metro region from early tonight into late tomorrow and temperatures will remain well below normal for this time of year. While there will be some 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 a couple of showers are possible on Sunday; especially, during the afternoon hours and in northern sections. 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 wet stretch of weather is coming to the DC metro region. First, there will be occasional rain today, tonight and on Friday and perhaps a thunderstorm or two mixed in as well. Some of the rain today can fall heavily at times. Then, a soaking rain is likely on Friday night and Saturday as a significant storm heads to the Mid-Atlantic coastline. On Sunday, Mother’s Day, while there will be some improvement, the atmosphere will remain quite unstable with cold air aloft associated with another deep upper-level low. This instability should lead to some clouds and a couple of showers cannot be ruled out. In addition, Sunday will remain quite cool for this time of year and the breeze will be noticeable. Much warmer air 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 DC metro region from Friday into 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 will be some shower activity ahead of the storm on Thursday and Thursday night, but the main action from the coastal storm will be from later Friday into 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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Europe had an extended period of colder-than-normal weather in April accompanied by lots of snow and now much of the US will experience an extended period of colder-than-normal weather as we transition from early-to-mid May. This cold snap could very well result in low temperature readings in the 30’s next week on multiple mornings in many suburban locations along the I-95 corridor – and that may not be the end of it as signs point to another cold shot later in the month.
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Strong low pressure will move slowly northward today on the western side of the Appalachians and it will produce a significant rainfall in the I-95 corridor. Rain will fall heavily at times today and there can be a strong-to-severe thunderstorm or two mixed in. Due to a blocking pattern in the upper part of the atmosphere, this system will linger in the Northeast US and continue to create instability in the atmosphere as we head into the weekend with more showers likely tonight, tomorrow and tomorrow night. In addition to the continuing shower threat in the Mid-Atlantic region, this strong low pressure system will usher in colder-than-normal air this weekend and it looks like it will stay below-normal around here well into next week.
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All systems are go for a significant rain event in the DC-to-Philly-to-NYC corridor from late tonight into late Friday and it could even have a negative impact on the morning commute as heavy rain will be in much of the area at that particular time along with possible strong thunderstorms. Low pressure is now forming over the Tennessee Valley and it will strengthen over the next 24 hours as it pushes northward along the western side of the Appalachian Mountains.
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Strong low pressure will push towards the eastern Great Lakes over the next 24 hours and this system will generate a significant rainfall for the DC-to-Philly-to-NYC corridor on the order of 1.00 to 2.00 inches. As the storm pulls northward, it’ll force somewhat milder air into the I-95 corridor and this could help generate some strong thunderstorm activity to go along with the periods of rain – some of which will be heavy at times. Following the passage of a strong cold front, colder-than-normal air will push into the region this weekend and, thanks to the formation of a classic “omega”-shaped blocking pattern in the upper atmosphere, it will stay colder-than-normal around here - and somewhat unsettled - for several days.
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