Low pressure will bring us more rain over the next couple of days and then weak high pressure will try to dry it out some on Friday…the last day of 2021. Strong low pressure will then impact the area on Saturday, New Year’s Day, producing very mild conditions around here and additional rainfall. After another mild and damp day on Sunday, sharply colder air will push into the region on Monday following the passage of a strong cold front.
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An active weather pattern will continue through the week across much of the nation. Multiple low pressure systems will form in a boundary zone region between very cold air sitting across the northwestern states/southwestern Canada and very mild air draped across much of the southern US. The next in a series of low pressure systems will generate some rain around here later this evening and then another one later tomorrow into early Thursday. A stronger storm early this New Year’s Day weekend could have a big impact on a large part of the nation with mild, rainy conditions likely around here, a possible severe weather outbreak in the Tennessee/Mississippi Valleys, and accumulating snow in the Upper Midwest. A second storm could follow from later Sunday into Monday and - given the potential of colder air filtering into the Mid-Atlantic from the northwest - it is a threat that needs to be monitored in coming days.
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An active weather pattern will continue across much of the nation during the next few days and indeed it is likely to last right through the upcoming New Year’s Day weekend. A huge difference in temperatures currently exists across the country from northwest-to-southeast and it is helping to fuel this activity with multiple low pressure systems to deal with as we head into the new year. A strong storm system on Saturday could have wide-ranging impacts from rainy, unusually mild conditions in much of the eastern US, severe weather in the Lower Mississippi and Tennessee Valleys, and accumulating snow from Colorado to Michigan. There is a chance that a follow-up storm takes place at the end of the weekend in the eastern US as sharply colder air pushes in from the northwest….something to monitor closely in coming days.
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The overall weather pattern for the final week of the year will be quite active with multiple systems impacting the region. The week begins with some as low pressure approaches and it can be mixed with snow or sleet at times this morning in the normally colder suburban locations to the north and west of the District. Additional low pressure systems will come our way for the mid and late week time periods bringing some rain shower activity. The weekend could feature a much stronger low pressure system in the eastern US sandwiched between warmer air to the south and east and colder air to the north and west.
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High pressure will move overhead today and this will cause a relaxation of the winds that buffeted the region on Wednesday. A fast-moving low pressure system will pass by to our north later tonight and it could generate a rain or snow shower in the overnight hours. Another low pressure system will approach the region on Friday night and it is likely to generate some rain shower activity on Christmas Eve and Christmas Day. Yet another low pressure system could arrive here early next week with the chance for more shower activity on Monday.
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Low pressure will strengthen off the east coast today and the pressure gradient between the departing low and a building high pressure system to our west will intensify resulting in increasing NW winds around here as the day progresses. It stays quite breezy tonight and Thursday will turn out to be a seasonably chilly day with high pressure in control. Low pressure will pass by to our north on Thursday night and its impact will likely be limited to areas north of the PA/MD border. Another low pressure system can bring some rain showers here on Christmas Day (Saturday).
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Low pressure will head up along the southeast US coastline today and its impact will largely be limited to areas to the south and east of the immediate I-95 corridor. Coastal sections of New Jersey and the Delmarva Peninsula could get a bit of rain out of this system later tonight and a late night rain, sleet or snow shower cannot be ruled out around here.. On the backside of the departing low pressure, winds on Wednesday will pick up in intensity out of the NW as another chilly air mass pushes into the region from the Great Lakes region. Fast-moving low pressure will cross the Northeast US on Thursday night and its impact will mainly be in areas to the north of the PA/MD border.
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Some of the coldest readings of the season so far this morning in the Mid-Atlantic region and it’ll remain on the chilly side today as the holiday shortened week begins. High pressure edges into the area today and then a low pressure system looks like it’ll stay just to our south and east at mid-week. A few waves of low pressure will come close to us later this week and weekend…something to monitor in coming days.
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A weak cool front has pushed through the region and its passage will shed a few degrees off temperatures, but they’ll remain above-normal for this time of year. Low pressure in the Ohio Valley will bring shower activity here later tonight and on Saturday. Following a cold frontal passage, it’ll turn colder for Sunday, Monday and Tuesday in what will be the beginnings of an overall colder weather pattern for the northern US.
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High pressure has shifted off the east coast and this will allow for a warm up on Thursday that should bring temperatures into the middle 60’s for afternoon highs. A weak cool front will push through on Thursday night and shed a couple of degrees off by Friday and then another front will arrive on Saturday. The early weekend system is likely to come with some shower activity for Friday night and Saturday and then it turns colder for Sunday and Monday. Looking ahead, it continues to look like the overall pattern will change to colder next week and beyond for much of the northern US.
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