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Blog

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

Filtering by Category: DC

7:00 AM | *Much milder conditions for the next couple of days...seasonal chill returns for Wednesday*

Paul Dorian

The warm up that began over the weekend will continue for the next couple of days with highs temperatures near 60 degrees today and well into the 60’s on Tuesday. A couple of showers are possible tonight as a frontal system is dragged through the region by low pressure to the north, but the bulk of today and Tuesday will be rain-free. A cold front will usher in colder air at mid-week, but it’ll turn milder again late in the week ahead of a strong cold front which should arrive here later Friday and set the stage for a much colder weekend.

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Friday 12:00 PM | **Snow continues well into the afternoon in DC-to-Philly corridor...many slick spots given the bitter cold**

Paul Dorian

There is still some snow falling at mid-day across western Pennsylvania and West Virginia and it’ll continue at varying rates for another few hours in the DC-to-Philly corridor. Ground-level temperatures remain quite cold during this snow event and this is a main contributing factor to the slick road conditions – even on treated surfaces - as salt is less effective at these very cold levels.  In general, surface temperatures in the DC metro region at mid-day fall near 20 degrees and between 10 and 15 degrees in the Philly metro region.  This system will stay primarily to the south of the NYC metro area with nothing more than some possible flurries – i.e., a “DC-to-Philly” special.  Accumulations in the DC-to-Philly corridor should end up in the “coating to an inch or two” range.

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7:00 AM | **Some accumulating snow today...watch for slick spots...warming trend begins this weekend**

Paul Dorian

Fast-moving low pressure will spread some accumulating snow into the Mid-Atlantic region today as part of a transition in the overall weather pattern from the recent bitter cold to milder conditions that’ll begin here this weekend. The snow should start by early-to-mid-morning in the DC metro region and then wind down during the afternoon with a coating to an inch or two. One word of caution, watch for slick spots on untreated and treated surface today as ground-level temperatures are very cold and salt is less effective. We’ll gradually step up in temperatures this weekend and then the real break in the cold will be experienced in the Monday-to-Wednesday time period of next week. Cold air, however, is likely to return at the end of next week following our temporary break in the cold.

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12:40 PM | *More snow coming on Friday…more on the record cold...and a temporary break in the cold*

Paul Dorian

Clouds will increase late tonight ahead of a quick-moving low pressure system and there can be a minor snow event on Friday in the DC-to-Philly corridor.  This system is a fast-mover with limited upper-level support and moisture so it should not be a significant snow producer - perhaps a coating to an inch or two - but still need to watch for slick spots with the frigid cold ground-level air temperatures.  The weekend will begin a warming trend that will peak in the Monday/Tuesday/Wednesday time period of next week, but cold weather will make a return by the end of next week.  Elsewhere, the record-breaking cold across the Upper Midwest will ease after today, but more all-time record lows were set this morning.

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7:00 AM | *Bitter cold today...chance for a little snow on Friday...turns milder early next week*

Paul Dorian

Arctic air flooded the Mid-Atlantic region late yesterday and today will be one of the coldest days of the year so far. Despite sunshine, temperatures will have a hard time climbing to the 20's and the breeze will remain a noticeable factor through at least the mid-day hours. The winds do die down by early tonight and then temperatures should drop back to the low-to-mid teens as clouds increase. On Friday, a quick hitting low pressure system could throw a bit of snow into the Mid-Atlantic region, but it is moving too quickly to be a significant snow producer. It’ll remain chilly on Saturday, but milder air will push in early next week and the break in the cold could last through next Thursday.

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10:30 AM | *****Arctic front to arrive this afternoon in the I-95 corridor with potentially damaging wind gusts and a possible heavy snow squall…temperatures plunge to near zero by late tonight*****

Paul Dorian

An Arctic front will blast through the region this afternoon and it could be accompanied by potentially damaging wind gusts of 50 mph or so, scattered snow showers, and perhaps dangerous, heavy snow squalls. The combination of strong upper-level energy and “frontogenesis” enhancing the chances for snow squall activity with the most likely time period of noon-to-2PM in the DC and Philly metro regions and 2-to-4 PM in NYC.  Any spot hit by a snow squall later today will see dramatically reduced visibility with near “white-out” conditions, strong winds, brief, but intense snowfall with a quick small accumulation of a coating to an inch and very slippery roads…do not drive in this!

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7:00 AM | ****Arctic front arrives this afternoon with potential damaging wind gusts, possible snow showers and even a heavy snow squall...near zero degrees in some spots by late tonight****

Paul Dorian

The next 24 hours will bring weather to the Mid-Atlantic region that is not often seen around here. First, an Arctic front will blast through the region this afternoon and it could be accompanied by potentially damaging wind gusts of 50 mph or so, scattered snow showers, and perhaps a heavy snow squall. Any spot hit by a snow squall will see dramatically reduced visibility, strong winds, brief, but intense snowfall with a quick small accumulation and slippery roads. The most likely timing for this frontal passage is between noon and 4PM in the DC-to-Philly-to-NYC corridor. Once the front clears the region, temperatures will plunge late in the day and early tonight reaching late night lows near zero degrees in many suburban locations along the I-95 corridor. Temperatures on Thursday will struggle to climb to 20 degrees despite plenty of sunshine. Wind chills will be painfully cold tonight and on Thursday at levels well below zero. The winds lighten up tomorrow night, but temperatures can fall back to the lower teens in many spots. A quick-hitting low pressure system could throw some snow our way on Friday afternoon.

Elsewhere, extreme cold has grinded the Upper Midwest to a virtual standstill with most schools and businesses closed for the next couple of days. Wind chills have reached very dangerous levels with some spots at more than 60 degrees below zero and this type of cold can cause frostbite in just a matter of a few minutes.

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11:40 AM | ***Precipitation picks up in intensity later today…Arctic front on Wednesday to feature strong wind gusts, snow showers and possible snow squalls…near 0 degrees by early Thursday morning***

Paul Dorian

A strong cold front is sliding towards the east coast at this hour and upper-level energy in the southern US is enhancing precipitation on its southern end.  This enhanced precipitation will move northeast and into the DC-to-Philly-to-NYC corridor later today and continue into the evening hours – mainly in the form of snow by the end of the day.  The Arctic front arrives on Wednesday and it will accompanied by strong wind gusts, scattered snow showers and perhaps a heavy snow squall or two.  Temperatures will then plunge tomorrow night following the passage of the Arctic front and near zero is a strong likelihood in many suburban locations by early Thursday morning. 

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7:00 AM | ***Accumulating snow later today/early tonight...untreated roads could deteriorate quite quickly as temperatures drop...Arctic blast tomorrow night/Thursday***

Paul Dorian

Low pressure will slide through the eastern Great Lakes region today and a strong cold front will trail on its southern side all the way into the southern states. Spotty and light mixed precipitation may break out this morning and mid-day, but the steadier and heavier stuff comes later this afternoon as the cold front arrives. Precipitation should change to snow later today and untreated roads could get slick by the evening commute. Likely snow accumulations later today/early tonight in the DC metro region should be on the order of a coating to a couple of inches. A true Arctic frontal boundary arrives on Wednesday and it is likely to be accompanied by strong wind gusts, possible snow showers, and perhaps even a heavier snow squall. The best chance for any snow on Wednesday should come between the hours of 10AM and 4PM. Arctic air then blasts into the Mid-Atlantic region late Wednesday and temperatures should be in the single digits by early Thursday morning.

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1:45 PM | ***Accumulating snow later Tuesday and roads could get slick…snow showers possible on Wednesday, maybe a snow squall…Arctic blast arrives in full force on Wednesday night***

Paul Dorian

Low pressure will slide through the Great Lakes region on Tuesday and a strong cold front will trail on its southern side all the way into the southern states.  A secondary low pressure system will form along the frontal boundary zone and enhance the precipitation threat in the I-95 corridor later tomorrow and tomorrow night.  Precipitation may arrive early tomorrow in the DC-to-Philly-to-NYC corridor as snow or a wintry mix and then change briefly to rain before changing back to all snow as colder air filters into the region on the back side of the frontal passage.  A true Arctic boundary arrives on Wednesday and it is likely to be accompanied by strong wind gusts, possible snow showers, and perhaps even a heavier snow squall.  Arctic air then blasts into the Mid-Atlantic on Wednesday night and temperatures could be near zero degrees in many spots by Thursday morning.

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