The threat of a late weekend storm system continues for the Mid-Atlantic region, and many details still must be ironed out to determine potential impact levels. The greatest impact may come in coastal sections from New Jersey to the Delmarva Peninsula to the eastern part of Virginia, still a few days away to fine-tune this idea. Low pressure will likely push towards the Carolina coastline by later Sunday and then intensify rapidly thereafter as it moves in an east-to-northeast fashion out over the open waters of the western Atlantic. The exact track and timing of the intensification of the low-pressure system remain open questions at this point int time and are critical in the determination of the ultimate impact in the Mid-Atlantic region.
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The next few days will be quite unsettled around here with a frontal boundary zone in close proximity. This front will be the conduit for multiple disturbances to ride along producing rain from time-to-time through Friday. The front will likely slip to our south by tomorrow leading to a cool down here with afternoon temperatures confined to the 40’s. Looking ahead, there is a chance we’ll have to deal with yet another late weekend storm system in the Mid-Atlantic region, but its ultimate track and impact is still in question. It turns quite cold again following that system for the early part of next week.
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This may sound familiar, but there is the chance that a storm system will travel eastward this weekend from the Deep South to the east coast, and it could threaten the Mid-Atlantic region with snow, ice and/or rain. The overall weather pattern will be quite active for much of the country in coming days with multiple storm systems to deal with and impacts from coast-to-coast. One storm system came ashore on Monday along the California coast, and it will push to the Colorado Rockies by the middle of the week. At the same time, a frontal boundary zone will start to set up from the Northern Plains to the northeastern states, and it will be the focus area for multiple disturbances leading to some snow and ice on its northern side and rain to the south.
By the early part of the weekend, another storm system will begin to take shape over the south-central US with its moisture field starting to expand. Much like the scenario that played out last weekend, this low pressure system will trek in a general eastward direction - riding along the subtropical jet stream - and potentially can reach the Mid-Atlantic coastline by late Sunday. With cold air in place and support in the upper atmosphere, this system could intensify at that point and become a threat for accumulating snow in at least portions of the Mid-Atlantic region by the latter part of the weekend.
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After a cloudy and foggy morning, skies should partially clear this afternoon and it’ll become milder with highs well up in the 50’s. A frontal boundary zone will set up right nearby at mid-week and result in unsettled weather around here for the remainder of the week with showers likely on multiple occasions. Looking ahead, we may have to deal with another late weekend storm system in the Mid-Atlantic region...more on that threat during the next few days.
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Low pressure will pull away from the coast this morning and leave behind moderately cold conditions with plenty of cloud cover. The overall pattern becomes milder for the bulk of the week with 60-degree high temperatures on the table and it becomes unsettled as well with multiple chances for rain.
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A storm system that came ashore in California at mid-week is crossing the southern states and will spread its precipitation shield into the Mid-Atlantic region from later Sunday into Sunday night. The air mass will initially be only marginally cold enough to support frozen precipitation; however, dynamical cooling in the atmosphere associated with a strong upper level jet streak should result in more favorable conditions for snow by Sunday night across eastern Pennsylvania, New Jersey, and New York City and up to a few inches are on the table. To the south of the PA/MD border, rain is likely to be the predominate precipitation type in the immediate DC metro area with no accumulations expected. However, snow and/or ice can mix in across some of DC’s far northern suburbs, and the northern part of Maryland that is close to the Pennsylvania border and northern Delaware can certainly see some small accumulations.
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It’ll be colder-than-normal today to end the work week despite plenty of sunshine and then slightly milder on Saturday to begin the weekend. A storm system will trek across the southern states this weekend and it should produce primarily plain rain around here from later Sunday into Sunday night…snow and/or ice can mix in at times across the northern suburbs. Following the passage of that storm system, milder air should reach our area by the middle of next week and temperatures can climb to near 60 degrees for afternoon highs.
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A low pressure system that produced some beneficial rain and snow across California on Wednesday will ride along the newly activated sub-tropical jet stream and re-emerge over the south-central states early this weekend. Warm and humid air will flow northward into this system from the Gulf, and this will help to intensify and expand the storm’s precipitation shield...all good news for the Deep South where it has been quite dry in recent weeks. The influx of warm and humid air will also help to destabilize the atmosphere, leading to a severe weather threat by later Saturday and Saturday night in portions of the south-central US. This system will then push eastward and head towards the eastern seaboard on Sunday potentially bringing some mixed precipitation to the Mid-Atlantic region which will be on the northern fringes of its moisture field. Much milder weather will follow across the northeastern states by the middle of next week.
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A cold front passed through the area on Wednesday and its passage will result in moderately cold conditions for the remainder of the week. The winds that intensified following the frontal passage will remain quite noticeable today with gusts from the northwest of up to 30 mph. Looking ahead, a storm system will trek across the southern states this weekend and it can impact the DC metro region with some rain from later Sunday into Sunday night. Following the passage of that system, a noticeably milder weather pattern will kick into gear across the northeastern part of the country for the bulk of next week.
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The polar jet has dominated the scene in recent weeks across North America resulting in numerous Arctic air masses being transported from western Canada into the northeastern states, but changes are underway as the sub-tropical jet is now showing plenty of life. This changing weather pattern will result in milder conditions across the northeastern states and some much-needed precipitation across the western and southern states after an extended dry stretch. The rejuvenated sub-tropical jet stream is pouring moisture today into southern California while an intensifying surface low pressure spins just off the San Francisco coastline. This system will produce some rain in low lying areas of the Golden State during the next 24 hours or so and significant accumulating snow in the mountains of eastern California.
By the early part of the weekend, this same low-pressure system will re-emerge over the south-central states and Gulf moisture will feed into its southeastern flank. As such, the moisture field will expand - good news for the Deep South where it has been dry - and the risk of severe weather will likely be put back in play in some areas. This system will then move in a general eastward direction and it can have an impact on the Mid-Atlantic region by the latter part of the weekend with mixed precipitation on the table. Much milder weather will follow in Mid-Atlantic/Northeast US later next week after the passage of this storm system off the eastern seaboard.
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