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Blog

Weather forecasting and analysis, space and historic events, climate information

Filtering by Category: PHL

12:00 PM | **Accumulating snow likely in much of the Mid-Atlantic on Thursday night…significant weekend storm to bring rain, ice and/or snow...Arctic blast follows**

Paul Dorian

An active weather pattern is setting up for the next several days with two systems to monitor and an Arctic blast by the early part of next week.  Low pressure will push out of the Ohio Valley on Thursday and likely produce accumulating snow in much of the Mid-Atlantic on Thursday night.  That snow could end as a period of light rain or freezing rain early Friday which could make for an interesting AM commute to end the work week.  The weekend will feature a strong cold frontal system sliding towards the east coast and a strong storm will form along the boundary zone.  That system may bring us some rain, but snow and/or ice are possible at the front end and also on the back end…many, many details still have to ironed out. What is quite certain is that the coldest air mass of the season will arrive late Sunday on the heels of the weekend storm and Monday promises to be very cold.

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7:00 AM | ***Accumulating snow possible Thursday night...significant storm this weekend with rain, ice and/or snow to be followed by an Arctic freeze***

Paul Dorian

A cold front will pass through the region tomorrow night and usher in colder air for Thursday which will feature increasing clouds ahead of the next low pressure system. This next low pressure is likely to bring some accumulating snow to the area on Thursday night which could end early Friday as light rain or freezing rain - possibly impacting the AM Friday commute. A strong cold front will arrive in the eastern US this weekend and a significant storm will develop along its boundary zone. The result is likely to be lots of rain, ice and/or snow for much of the Northeast US, but it is too early to tell how much of each will fall in the DC-to-Philly-to-NYC corridor. Snow and ice will be more likely across interior, higher elevation locations and rain will be more likely along coastal sections. On the back side of the storm, bitter cold Arctic air will flood the Mid-Atlantic region late Sunday into Monday and this could cause "flash freeze" conditions with a possible quick ice-up. Single digits are possible by early Monday morning - the coldest air mass so far.

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7:00 AM | **Storm threat for upcoming weekend as strong cold front arrives and we transition to very cold by early next week**

Paul Dorian

Low pressure will pull away from the Mid-Atlantic coastline today and high pressure will build into the region for the first part of the new work week. Temperatures over the next few days will be moderately cold for this time of year and there should be plenty of sunshine each day. Another cold front will approach on Wednesday night and usher in reinforcing chilly air for Thursday. Weak low pressure may produce some rain and snow around here on Thursday night. Another cold front will arrive in the eastern US this weekend and strong low pressure may form along the frontal boundary zone. This weekend event will transition us to very cold air that should reach us by early next week and that transition may feature a lot of rain, ice and/or snow...stay tuned.

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1:30 PM Saturday | ***A prolonged event and a "DC Special"...accumulating snow about to begin in much of the Mid-Atlantic region...DC's biggest of the year so far***

Paul Dorian

A large area of snow currently extends from the central Plains to the Ohio Valley and it is closing in on parts of the Mid-Atlantic region.  There will be two stages to this weekend snow event with overrunning and jet-streak induced light-to-moderate snow later today and early tonight. By late tonight and for the day on Sunday, low pressure induced snow aided by upper-level energy will produce heavier snow; primarily, in the region near and south of the PA/MD border.  In fact, the heaviest snow accumulations in this event are likely to come in the region from Virginia-to-Delmarva Peninsula-to-southern New Jersey.  This is looking like a prolonged event with snow possibly lasting until later tomorrow night in some parts of the Mid-Atlantic.

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12:30 PM Friday | ***Weekend accumulating snow for the Mid-Atlantic region***

Paul Dorian

Accumulating snow is falling today in the Colorado Rockies and this storm system will spread snow this weekend from the central Plains to the Mid-Atlantic.  Low pressure will be located over Oklahoma early tomorrow and generally head in an eastward direction towards the Tennessee Valley, and ultimately, will transfer its energy to the coastal region of North Carolina.  Snow will break out early Saturday in the central Mississippi Valley and then advance eastward to the Ohio Valley by mid-day and to the Mid-Atlantic region during the late PM hours.  On Sunday, as low pressure takes over at the North Carolina coastline, snow will wind down from northwest-to-southeast and it’ll last the longest in areas south of the PA/MD border.  Heaviest amounts of snow during this upcoming weekend event in the Mid-Atlantic region are likely to take place in parts of Virginia, Maryland, Delmarva Peninsula and southern New Jersey.

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7:00 AM | ***Accumulating snow this weekend in the Philly metro region***

Paul Dorian

Accumulating snow is on the way to the Philly metro region for the weekend. Low pressure will pull out of the southern US on Saturday and head towards the Tennessee Valley before ultimately winding up near the Outer Banks region of North Carolina by late Sunday. Snow will break out early Saturday in the central Mississippi Valley and then advance eastward during the mid-day to the Ohio Valley and then to the Mid-Atlantic during the PM hours. Snow will have difficulty reaching the ground at first in the Philly metro region due to the very dry (and cold) air expected in the low-levels of the atmosphere (i.e., single digit dew points), but should come down nicely tomorrow night. On Sunday, as low pressure heads towards the North Carolina coastline, snow will wind down here early in the day, but continue for awhile longer south of the PA/MD border across the Delmarva Peninsula and southern New Jersey. Preliminary snowfall estimates for the Philly metro region are 1-3 inches from this weekend event with the higher amounts in that range to the west and south of Philly and the lesser amounts to the north and east.

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2:00 PM | ***Weekend accumulating snow for much of the Mid-Atlantic region...looks like a prolonged event for some***

Paul Dorian

Accumulating snow continues to be a threat for the weekend in the Mid-Atlantic region with signs pointing to heavier amounts during this event in areas to the south of the PA/MD border.  Low pressure will pull out of the southern US on Saturday and head towards the Tennessee Valley before ultimately winding up near the Outer Banks of North Carolina by late Sunday.  Snow will break out on Saturday in the central Mississippi Valley and then push eastward to the Ohio Valley and then to the Mid-Atlantic region during the PM hours.  On Sunday, as low pressure heads towards the North Carolina coastline, snow will continue in the Mid-Atlantic region with the heaviest amounts likely across Virginia, Maryland, Delmarva Peninsula and perhaps southern New Jersey.

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7:00 AM | ***Very windy today with gusts to 50 mph possible...some accumulating snow this weekend***

Paul Dorian

The pressure gradient will remain rather tight today between strong low pressure over the Canadian Maritimes and strong high pressure over southern Canada and this will result in continued strong winds around here in the Mid-Atlantic region with gusts to 50 mph possible. Winds will slacken off tonight and Friday, but the chill will continue with overnight lows way down in the 20’s and highs struggling to reach freezing on Friday afternoon. By the early part of the weekend, low pressure will pull out of the south-central US and heads towards the northeast at the same time strong high pressure will build into southeastern Canada with a reinforcing very cold air mass. While still a couple days away, some accumulating snow is a good bet in the Philly metro region from later Saturday into Sunday.

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2:45 PM | **Weekend snow threat continues for much of the Mid-Atlantic region**

Paul Dorian

Snow continues to be a threat for the weekend in the Mid-Atlantic region with early indications suggesting that the heaviest snowfall amounts may end up being south of the PA/MD border.  Low pressure will pull out of the south-central US early in the weekend and slowly head towards the eastern seaboard – perhaps near the Outer Banks region of North Carolina.  The chances for accumulating snow this weekend will largely depend on upper-level energy that is just now closing in on the west coast of the US. 

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7:00 AM | ***Strong winds today with possible snow showers...weekend snow threat***

Paul Dorian

The pressure gradient will tighten today between intensifying low pressure over New England and strong high pressure over southern Canada and this will result in strong winds around here with gusts past 40 mph and there can be accompanying PM snow shower activity. Winds may slacken off a bit tonight as diurnal heating dissipates only to resume at rather high levels again during the day on Thursday. Temperatures will actually drop some between today and Thursday following the passage of a secondary cold front and highs will struggle to reach the freezing mark on Friday although winds will be somewhat reduced to end the work week. By the weekend, low pressure will be gathering strength over the Gulf of Mexico at the same time strong high pressure will slide east across south-central Canada. The upper atmosphere will feature two waves of energy by early Saturday – one in the northern jet stream over the western Great Lakes and the other down in the south-central US. There a few days to go and these upper-level features are still a long way away, but it looks like some accumulating snow is a good bet in the Philly metro region from later Saturday afternoon into Sunday...stay tuned.

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