The overall weather pattern will remain quite active during the next several days with storm threats possible in the Mid-Atlantic/Northeast US both at week’s end and again early next week. The overall weather pattern is also turning colder due in large part to significant high-latitude blocking that has developed over northern Canada/Greenland in response to recent stratospheric warming and to the likely upcoming disappearance of a stubborn ridge over the southern US.
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The overall weather pattern will remain quite active in the Mid-Atlantic region during the next several days with one quick-moving system late tonight and there can be additional threats both early this weekend and early next week. This initial system can generate snow or rain changing to snow from late tonight into early Tuesday across portions of upstate Pennsylvania and western New Jersey and some higher-elevation spots can receive as much as 3-6 inches by daybreak. The overall weather pattern is turning colder due in large part to significant high-latitude blocking that has developed over northern Canada/Greenland and to a disappearing stubborn ridge over the southern US.
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A very impactful storm system will slide out of the SW US later today and begin to intensify over the south-central states by later tonight. After slamming California and the southwestern states, this system will bring accumulating snow, excessive rain, and damaging ice to parts of the eastern half of the nation during the next couple of days. In addition, this system will contribute to a potential severe weather outbreak from later today into Friday across the south-central US.
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Strong low pressure now over the western US will impact much of the nation in coming days with significant snows, flooding rains, damaging ice, and even a severe weather outbreak. Heavy snow continues to fall today in the higher elevations of California’s Sierra Nevada Mountains and will intensify over the Rocky Mountains States from later today into Thursday. By later tomorrow, the strong surface low will slide into the south-central US and ingredients will likely come together for a severe weather outbreak across the Mississippi and Tennessee Valleys from late tomorrow into Friday. After that, this major storm system will push towards the Great Lakes on Friday, grind to a halt as it becomes influenced by intensifying high-latitude blocking and transfer its energy to a secondary low pressure system that will form off the northern Mid-Atlantic coastline. The result will be a significant snow event late in the week across parts of the Upper Midwest and Northeast US and ice can become a serious issue as well in some sections.
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As one storm begins to exit off the Northeast US coastline, another one is already impacting northern California with rain in the lower elevations and snows in the mountains. This system will become a major storm and impact much of the nation in coming days with significant snow, ice and rain all the way from California-to-New England. There is also the threat of a severe weather outbreak later in the week across the Lower Mississippi and Tennessee Valleys.
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There was record warmth in parts of the East on Thursday including in the Mid-Atlantic region where, for example, Washington, D.C.’s Reagan National Airport (DCA) surged to 81 degrees breaking a record set in the late 1800’s. What a difference a day makes…temperatures at mid-day on Friday are in the 40’s in much of the Mid-Atlantic with very gusty NW winds following the early day passage of a strong cold front. The change in weather will become even more dramatic by Saturday as some snow shower activity is likely in the Mid-Atlantic region – including in some of those same areas that reached the 70’s and 80’s just twenty-four hours ago. Looking even farther ahead, accumulating snow and/or sleet is possible from later Monday into early Tuesday across portions of the northern Mid-Atlantic including in the New York City metro region.
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The country is sharply divided today in terms of temperatures with record-breaking warmth in the East and bitter cold in much of the western half of the nation. In addition to the cold, accumulating snow is falling in a swath from the Upper Midwest to northern New England from a storm system that has impacted a large part of the nation in recent days. Snow is also falling across many western states and blizzard warnings have been posted in of all places the southern part of California. In fact, for the first time ever, blizzard warnings have been issued by the San Diego office of NOAA’s National Weather Service for the San Bernardino Mountains.
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The overall weather pattern across the eastern US has been active in recent weeks and there is reason to believe it’ll remain quite energetic over the next couple of weeks. In fact, the Mid-Atlantic/Northeast US can become quite a “battle zone” region with the development in coming days of high-latitude blocking across Greenland/Northeastern Canada at the same time high pressure ridging persists over the Southeast US. There will be times when the SE US ridge shows its strength with warm air surging northward into the Mid-Atlantic region and other times in which the high-latitude blocking flexes its muscle resulting in cold air dropping southward from Canada into the northeastern part of the US.
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An active weather pattern continues across the central and eastern US with one system producing accumulating snow today in the Upper Midwest and then a second system will produce rain, ice, and snow in parts of the eastern US this weekend. One upper-level wave of energy heads to the Great Lakes region today and a second one will dive to the Deep South over the next couple of days. Low pressure is going to form near the Southeast US coastline later Saturday and it will then likely grind its way to the southern Mid-Atlantic coastline by later Sunday. While there will not be any kind of real cold air in place, the chance for significant accumulating snow this weekend is certainly there for the higher elevation locations of the Appalachian Mountains where over a foot can fall.
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An active weather pattern continues across the nation with severe weather a threat later today in the south-central US/Lower Mississippi Valley and accumulating snow on the table later tomorrow across the Upper Midwest. Another system will dive to the southeast over the next few days and reach the southeastern states by early this weekend. Low pressure is likely to form near the Southeast US coastline on Saturday and it can grind its way far enough to the north to impact the Mid-Atlantic region on Super Bowl Sunday. While there will not be any kind of real cold air mass in place, the chance for snow or sleet is on the table in higher elevation locations of the Carolinas and Mid-Atlantic region and potentially in other “dynamically cooled” regions.
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