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Blog

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

Filtering by Category: PHL

7:00 AM | **Arctic cold made worse today by strong winds, possible snow showers...some snow likely here on Friday**

Paul Dorian

The coldest core of this most recent Arctic air outbreak has moved into the Mid-Atlantic region and Northeast US following the overnight passage of a frontal system. As a result, temperatures today will be confined to the 20’s for highs – well below normal for early March – and strong winds will generate even lower wind chill values. In addition, instability in the atmosphere could result in some snow shower activity; primarily, across northern suburbs and there may even be an isolated snow squall. The next low pressure system of note to monitor will trek across the nation over the next couple of days and it can produce some snow here on Friday. The upper-level energy supporting this system will get somewhat “stretched out” over the next couple of days, but the chance for small snow accumulations is on the table for Friday in the DC-to-Philly-to-NYC corridor. A more important system will head towards the Great Lakes this weekend and likely push rain into the region by early Sunday and there is a chance for some frozen precipitation at the onset in some nearby higher elevation locations such as east-central and NE PA.

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11:40 AM | **Impressive Arctic cold for early March across much of the nation**

Paul Dorian

A widespread outbreak of Arctic air has encompassed much of the nation and it will actually get worse in the Mid-Atlantic/Northeast US before it gets any better.  Record or near record low temperatures extended across much of the nation both this morning and yesterday morning and there will no doubt be more record-breaking cold over the next couple of mornings.  The next threat for snow in the Mid-Atlantic region comes on Friday, but it currently does not look like a significant event.

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7:00 AM | *Unusually cold air mass for early March reaches its most painful levels on Wednesday*

Paul Dorian

An Arctic air mass has flooded the eastern half of the nation and the coldest air temperatures and strongest winds will take place on Wednesday. The next low pressure system to monitor will arrive in the Mid-Atlantic region on Friday on the back end of this unusual cold spell and it could result in some snow. It’ll turn milder this weekend and an area of rain is likely to move into the eastern states on Sunday ahead of another cold frontal system.

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7:00 AM | ***Now comes the Arctic cold***

Paul Dorian

Strong low pressure is now heading away from the Mid-Atlantic coastline and our focus will shift from the winter storm to an influx of Arctic air which will be way below-normal for this time of year. Not only will colder-than-normal weather persist this week in the local region, but for much of the eastern 2/3rds of the nation as well. Temperatures could actually bottom out in the single digits this mid-week in many suburban locations. High pressure will build into the area on Tuesday and control the weather into the latter part of the new work week. There is the threat for more snow at week's end.

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9:00 AM (Sunday) | *****Winter storm gets underway shortly in the Mid-Atlantic region and generates significant snowfall in many suburban locations…widespread Arctic cold to follow*****

Paul Dorian

A significant winter storm will impact the Mid-Atlantic region from this afternoon into early Monday morning. Low pressure will intensify as it takes a track towards the southeastern Virginia coastline by later tonight and then it moves quite rapidly to a position off the southern New England coastline by early Monday. Significant snow accumulations are likely in many northern and western suburbs along I-95; especially, in areas north of the PA/MD border.  An Arctic air mass will flood the eastern half of the nation following the storm with way below-normal temperatures for the first full week of March.

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12:00 PM (Saturday) | *****Late weekend storm to have a big impact in the Mid-Atlantic region...heavy snowfall in the northern and western suburbs along I-95*****

Paul Dorian

March has begun like a lion with cold and an active pattern and there is one more storm to deal with before an Arctic blast arrives and this storm may have the biggest impact of all.  Storm #1 brought accumulating snow to much of the Mid-Atlantic region on Thursday night, storm #2 brought snow and ice to many areas on Friday night, and the next storm is likely to begin on Sunday afternoon with the most potential of all as it will be loaded with moisture. The immediate I-95 corridor region from DC-to-Philly-to-NYC is going to be the “battle zone” region with significant snow accumulations to the north and west and mainly rain to the south and east.

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12:15 PM (Friday) | ****Next wintry storm arrives tonight…third storm arrives on Sunday afternoon and has the potential for a major impact and significant snow…Arctic cold to follow****

Paul Dorian

March has begun more like a lion than a lamb and there are two more storms to deal with over the next few days which can bring additional accumulating snow and ice to the Mid-Atlantic region.  Storm #1 brought accumulating snow to the Mid-Atlantic region in the overnight hours and is now pushing off the coastline, but there will be no clearing behind it.  In fact, storm #2 is already gathering strength in the Southeast US and its precipitation shield will expand noticeably later today as it gets invigorated by an upper-level wave of energy. This next storm can start as a wintry mix tonight and a transition to all snow is possible in the overnight hours; especially, to the north and west of I-95.

Storm #3 arrives on Sunday afternoon and has the greatest potential of all for a significant impact as it will be loaded with moisture.  The immediate I-95 corridor region from DC-to-Philly-to-NYC is liable to be the “battle zone” region with significant snow accumulations possible to the north and west and mainly rain to the south and east. There is the potential for 6+ inches of snow to the north and west of Philly and NYC and perhaps even as far south as the far northern and western suburbs of DC - but some details still have to be ironed out.  All of this activity will be followed by an Arctic outbreak for next week across much of the nation.

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7:00 AM | ****Storm #1 winds down today...storm #2 arrives tonight with accumulating snow possible...storm #3 later Sunday into early Monday with lots of potential...all followed by Arctic cold****

Paul Dorian

March is coming in like a lion with overnight accumulating snow and two more storms are on the way. Low pressure is now heading towards the Mid-Atlantic coastline and it is bringing us round one of an extended wintry precipitation event. That same low pressure system will hang around the Mid-Atlantic coastline during the remainder of today and it’ll get energized by early tonight as upper-level energy passes overhead. As a result, after a break for awhile in the precipitation, more rain, sleet and/or snow can fall early tonight and then likely transition to all snow late with additional accumulations of a couple inches possible. Yet another wintry precipitation event is headed to the Philly metro region for later Sunday into early Monday. This next system will have plenty of available moisture; consequently, a lot of potential, but it is unclear as to where the all-important rain/snow line may set up. Rain, sleet and/or snow can break out in the Mid-Atlantic region during the afternoon hours on Sunday and then possibly transition to all snow Sunday night with snow accumulations possible; especially, to the north and west of I-95...stay tuned. All of this will be followed by Arctic cold for the first full week of March.

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12:00 PM | ***March to begin with accumulating snow in the Mid-Atlantic…precipitation threat resumes later Fri. into early Sat.…significant rain, sleet and/or snow likely later Sun. into early Mon.***

Paul Dorian

March is going to begin with some accumulating snow for the Mid-Atlantic region and it could have an impact on the Friday morning commute in the DC, Philly metro regions.  Low pressure will push towards the Mid-Atlantic coastline in the overnight hours and snow is likely to break out around or shortly after midnight in the DC-to-Philly corridor and it can be mixed with sleet and/or freezing rain at times; especially, south of the PA/MD border.  That low pressure system hangs around the Mid-Atlantic coastline on Friday and gets energized late in the day as upper-level energy passes overhead and this can lead to more rain, sleet and/or snow from late Friday into early Saturday including additional accumulations in some areas.  Yet another wintry precipitation event is likely headed to the Mid-Atlantic region for later Sunday into early Monday. The late weekend system will have plenty of available moisture to it; consequently, lots of potential, but it is unclear as to where the all-important rain/snow line may set up. 

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7:00 AM | ***March gets underway with accumulating snow and a messy early morning commute...threat continues for late weekend wintry event***

Paul Dorian

March looks like it will get underway with accumulating snow in the Philly metro region as an active weather pattern continues across the nation. Low pressure will pull out of the Midwest later today and slide across our area late tonight and likely bring accumulating snow that can be mixed with sleet and/or freezing rain at times. Average accumulations of 1-3 inches are on the table by early Friday with the higher amounts on the southwest side of the area and there can be some impact on the AM commute. It stays unsettled later tomorrow, tomorrow night and Saturday with another couple of waves possibly generating some chilly rain for the area and snow or sleet can be mixed in at times. A cold front slides towards the Mid-Atlantic region on Sunday and this could set the stage for an important late weekend wintry event, but it is too early to say if it will feature rain, sleet or snow or some combination of the three.

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