Showers and embedded strong thunderstorms in the overnight hours were associated with the passage of a warm frontal system that has resulted in noticeably warmer and more humid air for the Mid-Atlantic region; especially, when compared to the last few comfortable cooler-than-normal days. Today’s temperatures will climb well into the 80’s and the humidity levels have climbed to uncomfortable levels and these harsh conditions will only intensify over coming days. In fact, temperatures should easily reach the 90 degree mark for highs on Friday in the DC-to-Philly-to-NYC corridor and then climb well into the 90's on Saturday, Sunday and Monday - perhaps even a flirtation with the 100 degree mark in some spots on those three days. This stretch of hot and humid weather will likely last for a week or so from its beginning on Friday. The good news is that this extended stretch of heat and humidity could very well be the worst of the summer in the Northeast US as there are signs for more comfortable weather conditions during the second half of July and during the month of August.
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Following the passage of a warm front, it’ll turn noticeably warmer and more humid today and the heat and humidity will continue to build around here on Friday. Temperatures should climb well into the 80’s later today and then reach or surpass 90 degrees on Friday, Saturday and Sunday. It should stay rain-free on Friday and during the upcoming weekend, but the chance for showers and thunderstorms will slowly increase for later Monday, Tuesday and Wednesday (4th of July).
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High pressure to our north has shifted to a position off the east coast and a weak frontal system will slowly approach us from the west over the next 24 hours. As a result, the chances for showers will increase markedly by later today and there will be occasional showers and possible embedded thunderstorms tonight and part of Thursday. Some of the rain can come down hard at times in the overnight hours and early on Thursday. Heat and humidity will build by Friday afternoon and it’ll stay uncomfortable through the weekend and right into the middle part of next week. While the Friday, Saturday, Sunday time period looks to be generally rain-free, the chance for showers and thunderstorms will increase for later Monday, Tuesday and Wednesday (4th of July).
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High pressure over New England will control our weather for another day before it shifts eastward to a position off the east coast by later tonight and early Wednesday. As the high shifts to the east, our low-level winds will change direction and turn to a more southwesterly direction and overall humidity will climb. Also, as a front slides eastward towards the Mid-Atlantic region, our chances for showers and thunderstorms will rise later Wednesday and that threat should continue into Thursday as well. Heat and humidity will then build noticeably around here on Friday and uncomfortable conditions will continue this weekend and likely right into the middle of next week.
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The summer solstice has just passed and the days will grow shorter and shorter from here on out until the winter season gets underway. While winter is still a long way off, there are already some clues that can provide some insight as to what kind of weather we can expect around here in the Mid-Atlantic region. First, signs point to the formation of warmer-than-normal sea surface temperatures by the upcoming winter season in two key areas of the Pacific Ocean: 1) the central equatorial region and 2) the Gulf of Alaska. Second, there is little doubt that solar activity will remain on the low side through the upcoming winter season as we are rapidly approaching the next solar minimum phase from an already historically weak solar cycle #24. Finally, one important wintertime cold air source region for the Mid-Atlantic is Greenland and it is currently experiencing above-normal snow and ice cover. While this is in the speculation phase, all of these factors point to the possibility of cold and snowy conditions in the Mid-Atlantic region during the upcoming 2018-2019 winter season.
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The new work week starts off with very pleasant conditions in the Mid-Atlantic region, but a heat wave is in the making as we reach the end of June and begin the month of July. High pressure over southeastern Canada will build southward today and control the weather around here for the next couple of days. Temperatures and humidity levels will be very comfortable for late June and there will be plenty of sunshine as well each of the next two days. A frontal system will approach the area on Wednesday and there will be a noticeable increase in clouds and humidity and also a chance of showers and thunderstorms from later Wednesday into Thursday. Heat and humidity then returns by the weekend and it looks like this unfolding heat wave will continue well into next week.
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High pressure will lose its influence around here later today as a low pressure system over the Mississippi Valley heads northeastward towards the Great Lakes. This low pressure system will lead to a warm frontal passage here on Saturday and then it will drag a cool front through the region late in the day on Sunday. As a result, scattered showers and thunderstorms will likely threaten from later tonight into tomorrow night and then again late Sunday as the cool front arrives. Large and strong high pressure centered over the Great Lakes early next week will control the weather around here and the result will likely be a spectacular Monday, Tuesday and Wednesday with very comfortable conditions for late June.
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Low pressure will pull away from the east coast this morning and high pressure will build in from the north and bring us improving weather, but just for a relatively short period of time. That same high pressure system will push off the coast early Friday opening the door for more moisture to arrive in the region in the form of scattered showers and thunderstorms which will be take place from later tomorrow into Saturday. A cool front will then arrive late Sunday perhaps accompanied by a few additional late day or nighttime showers and thunderstorms. High pressure situated to our north is likely to result in very nice weather around here in the Monday-to-Wednesday time period - a great time to take a few days off.
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A cool front grudgingly passed through the area yesterday and it is now stalling out just to the south of here. This stalled out front will lead to more wet weather around here as a wave of low pressure is going to move from west-to-east in the overnight hours right along the frontal boundary zone. Showers may begin here by the end of the day and then showers and thunderstorms will become widespread tonight and some of the rain may fall heavily at times. After early clouds and possible lingering showers on Thursday, high pressure will edge in and improve the weather for a short period of time. Another round of showers and thunderstorms is likely to arrive in the Mid-Atlantic region late Friday and continue off and on into Saturday night. A cool front will then pass through the region on Sunday - perhaps with another shower or thunderstorm - and then nicer weather is likely here from Monday through Wednesday of next week with strong high pressure situated to our north.
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A cool front will pass through the region later today and humidity levels will drop compared to yesterday. This front will then stall out just to our south by later tomorrow and this will lead to more unsettled weather conditions around here at mid-week as a wave of low pressure is likely to track right along the frontal boundary zone. High pressure will then try to take control of the weather on Thursday and Friday, but it is likely to move off the coast by early this weekend opening the door for more moisture to head eastward into the region.
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