Humidity levels remain rather high this morning and the combination of this moist air mass and a nearby stalled out frontal system will likely lead to scattered showers and thunderstorms later today and tonight. The chance of showers and thunderstorms will continue on Saturday and then likely increase tomorrow night and Sunday as low pressure rides up along the stalled out frontal boundary zone. Some of the rain that falls from tomorrow night into Sunday can be heavy at times and localized flooding may become an issue once again. Temperatures over the next few days will be rather comfortable for this time of year as strong high pressure builds across southeastern Canada and produces a northeasterly flow of air around here.
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The overall weather pattern will remain very unsettled in parts of the Mid-Atlantic region right though the upcoming weekend with the threat for more torrential downpours and localized flash flooding; especially, south of the PA/MD border. The combination of an extremely humid air mass, a stalled out frontal boundary zone, and multiple low pressure systems should provide enough “lift” in the atmosphere to continue to produce heavy rainfall with rain rates of 2+ inches per hour. Given the already very well-saturated grounds, this additional rainfall can lead to some serious localized flash flooding conditions. With limited wind flow in the lower atmosphere, any shower or thunderstorm that develops in this pattern will be slow-moving and potentially resulting in a few inches of rain over a relatively short period of time.
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The overall weather pattern will remain quite unsettled around here over the next few days with the threat for more torrential downpours and localized flash flooding. The combination of an extremely humid air mass, a stalled out frontal boundary zone, and multiple low pressure systems should be able to provide enough “lift” in the atmosphere to result in additional heavy rainfall and given the already well-saturated grounds, this can lead to flash flooding conditions. As far as temperatures are concerned, it will not be as warm today as recent days and below-normal temperatures should be the rule for Friday and the upcoming weekend as strong high pressure builds across southeastern Canada.
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The overall weather pattern will remain quite unsettled in the Mid-Atlantic region over the next several days with the threat for more torrential downpours with rates of 2+ inches per hour and flash flooding conditions. The combination of an extremely humid air mass, a stalled out frontal boundary zone, and multiple low pressure systems should be able to provide enough “lift” in the atmosphere to result in heavy rainfall in coming days and given the already well-saturated grounds, this can lead to some serious flash flooding. In fact, there were torrential downpours in the pre-dawn hours across northern Virginia that resulted in damage to roadways in places like Manassas Park and the entire DC-to-Philly-to-NYC corridor remains under “flash flood watches” as a result of the potential for more heavy rainfall and saturated grounds.
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An unsettled second half of the week begins today in the DC metro region and lasts right through the upcoming weekend. A weak frontal system will stall out nearby later today and several areas of low pressure will ride along the boundary zone in coming days. As a result, there will be a good chance of showers and possible PM thunderstorms on a daily basis through Sunday and any rain can be heavy at times given the high available amounts of moisture in the atmosphere. Flash flooding is a concern given the potential of some heavy rainfall and the already well-saturated grounds from recent soaking rains. In addition to the increased chances for rain, this unsettled weather pattern will bring about a cool down as we progress through the week with cooler-than-normal highs in the low-to-mid 80’s by week’s end and likely continuing this weekend as well.
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An unsettled second half of the week is coming to the Mid-Atlantic region as a weak frontal system will stall out in nearby proximity. In addition to the stalled out frontal boundary zone, there will be several areas of low pressure that develop and track along this front right through the upcoming weekend. As a result, the chance of showers and thunderstorms will be quite high on a daily basis from tomorrow through Sunday and temperatures will trend downward as the week progresses.
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It looks like another 24 hours or so of unsettled weather conditions for the Mid-Atlantic region due to the combination of upper-level energy, a meandering frontal system, and strong winds in the upper part of the atmosphere. There can be additional showers and thunderstorms today and tonight with the chance for some heavy rainfall at times and, given the already well-saturated grounds, this could lead to flash flooding in some spots. High pressure will build into the area this weekend and there will be improving weather conditions although a couple of showers cannot be ruled out for Saturday, maybe a thunderstorm. Elsewhere, the Atlantic Basin tropical scene looks rather quiet and should stay so for the next several days. One final note, the annual Perseid meteor shower will peak next week…best to look for meteors in the pre-dawn hours of Tuesday, Wednesday and Thursday.
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The next couple of days and nights look very unsettled in the Mid-Atlantic region as a frontal system will meander nearby leading to the chance of showers and thunderstorms right through tomorrow night. Flash flooding is indeed a concern given the already well-saturated grounds and the expected new rainfall which can be heavy at times. Looking ahead, the weekend is shaping up to be pretty decent for this time of year with a chance for a shower or thunderstorm on Saturday and then likely rain-free conditions on Sunday. Temperatures will turn cooler today and remain rather moderate over the next few days. As far as the tropics are concerned, it looks quiet on that scene with a lull in the action for the Atlantic Basin during the next several days.
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A quiet day is coming to the Mid-Atlantic region following the wild weather of Tuesday that was associated with Tropical Storm “Isaias”. “Isaias” has raced into the southeastern part of Canada and high pressure will build into the region and generally take control of the weather for the next few days. There can be a few scattered showers and thunderstorms over the next few days as a weak front meanders in the region, but much of the time should be rain-free. As far as the tropics are concerned, it looks quieter on that scene as well with a lull in the action for the Atlantic Basin which has had a very active season so far.
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The good news is that “Isaias” is accelerating to the northeast and the wild weather should wind down later this afternoon in much of the Mid-Atlantic region. In fact, the sun could actually return in portions of the Mid-Atlantic region later today. The bad news is that there is another several hours to get through before we get to that point with some pretty rough weather including more flooding rainfall, powerful and potentially damaging wind gusts, numerous power outages and isolated tornadoes. By later tonight, “Isaias” will race across interior New England on its way to southeastern Canada and the weather in the Mid-Atlantic region will improve markedly overnight and on Wednesday.
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