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Blog

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

Filtering by Category: DC

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 | ***Wintry mess late Thursday and Thursday night...significant weekend storm to bring rain, ice and/or snow and will be followed by an Arctic blast***

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 rain, ice and/or snow to the area on Thursday night with small accumulations possible. 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 - the coldest air so far - and this could cause "flash freeze" conditions with a possible quick ice-up.

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7:00 AM | **"Snow hole" no more...storm threat for the upcoming weekend in transition to very cold air**

Paul Dorian

There should be no more talk for awhile about a DC "snow hole" after the weekend event...10+ inches at Reagan National Airport (DCA), Dulles Airport (IAD) and in Chantilly, VA - even more than that in some locations. 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 activity 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 DC metro region***

Paul Dorian

Accumulating snow is on the way for the weekend in the DC metro region. 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 DC metro region due to the very dry (and cold) air expected in the low-levels of the atmosphere, but should come down quite nicely by later in the day and again tomorrow night. On Sunday, as low pressure heads towards the North Carolina coastline, snow will continue for awhile in the metro region and then gradually wind down from northwest-to-southeast. Preliminary snowfall estimates for the DC metro region are 3-6 inches from this weekend event with the higher amounts in that range to the west and south of the District 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...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 possible to 50 mph. 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 the mid 30's 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, accumulating snow is a good bet in the DC metro region from Saturday afternoon through Sunday with several inches on the table in parts of Virginia and Maryland...stay tuned.

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7:00 AM | ***Strong winds today with snow showers...weekend accumulating 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 mid 30's 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 accumulating snow is a good bet in the DC metro region from Saturday afternoon into Sunday...stay tuned.

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12:15 PM | **Strong cold front arrives late this evening…powerful winds on Wednesday and Thursday…weekend snow threat continues**

Paul Dorian

The last couple of weeks were well above-normal in the eastern half of the nation, but this week will be a lot different with progressively colder conditions.  In addition, winds will become quite a factor as they will become very strong on Wednesday and Thursday with gusts to 50 mph possible in the DC-to-Philly-NYC corridor.  As far as precipitation is concerned, a strong and active cold front will arrive later this evening with occasional rain showers and there can be a rumble of thunder.  Looking ahead, snow continues to be a threat for the weekend in the Mid-Atlantic region.  The chances for significant snow this weekend in the DC-to-Philly-to-NYC corridor will ride on the timing of the phasing together of waves of energy in the northern and southern jet streams.  Early indications suggest the phasing together of these two systems may not occur until they’re both offshore which would reduce chances for important snow accumulations in the I-95 corridor; however, it is way too early to write off a significant snowfall for the DC-to-Philly-to-NYC corridor.  

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