An unusually strong “cold air damming” scenario is looking likely for the next few days anchored by a deep high-pressure system centered over southeastern Canada. As a result, a stiff flow of air from the east-to-northeast will form producing far below normal temperatures in the DC-to-Philly-to-NYC corridor for the bulk of the week. In addition to the chill down, the weather will be quite unsettled as well with periods of rain during the next few days as multiple low pressure areas ride along a nearby frontal boundary zone and one of these will intensify over the western Atlantic. With the expected lengthy period of onshore flow, tidal flooding will likely become a big concern along coastal sections by later in the week.
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Temperatures have been consistently peaking well up in the 80’s in recent days along the DC-to-Philly-to-NYC corridor, but there can be quite a change by the middle of next week. An unusually strong “cold air damming” setup is looking likely with deep high pressure centered over southeastern Canada and this could limit temperatures to the 60’s along the I-95 corridor. In addition to the high-pressure system to the north, this scenario will feature a slow-moving frontal boundary zone that will allow multiple low pressure systems to ride along bringing plenty of moisture into the Mid-Atlantic region. And there is the chance that one of these low pressure systems intensifies just off the Mid-Atlantic coastline in “nor’easter” fashion. The bottom line…occasional rain is likely from Sunday into the middle of next week and some of the rain can be heavy at times to go along with much cooler-than-normal temperatures.
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High pressure will return to the area today on the heels of the latest frontal passage and the work week will end on a more comfortable note with lowering humidity values. A stretch of unsettled weather begins on Sunday with occasional rain likely to end the weekend and the rain can get heavy at times. The unsettled weather can last all the way into the middle next week with additional showers from time-to-time and it’ll turn very cool for this time of year. The culprit to the unsettled and cool weather pattern will be strong high pressure to our north combined with a stalled out frontal boundary zone that will allow multiple systems to ride along and bring moisture into the Mid-Atlantic region.
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High pressure will push away from the area today and a cold front approaches from the north and west raising the chance for afternoon and evening showers and thunderstorms. Following the frontal passage on Friday, high pressure will build back into the region providing us with plenty of sunshine and comfortable conditions to end the work week. A couple of frontal systems will impact the region during the second half of the weekend and the early part of next week producing unsettled weather conditions on Sunday, Monday and Tuesday with the chance of showers from time-to-time.
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High pressure that had its origin over central Canada will remain in control of the weather around here for another day with comfortably warm conditions, plenty of sunshine, and moderate humidity levels. Two frontal systems will head this way during the next few days with the first likely to generate isolated showers and thunderstorms late tomorrow and tomorrow night and the other brings unsettled weather to the Mid-Atlantic region for Sunday, Monday and possibly Tuesday as well.
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High pressure that originated over central Canada will remain in control of the weather around here for the next few days with plenty of sunshine on a daily basis and continuing comfortable temperatures and humidity levels. The next frontal system arrives late in the week, but it looks rather weak and this could be a rain-free event. A stronger system could arrive by the latter part of the weekend and early part of next week with a better chance for some widespread rainfall in the Mid-Atlantic region.
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We have now reached rare territory for the Atlantic Basin due to the lack of hurricanes at this stage of the tropical season. In fact, this is the latest time without an Atlantic hurricane during the satellite era which began in 1966 and there is likelihood that one has to go all the way back to 1941 though confidence in the tracking of hurricanes is far less certain in the pre-satellite era. Having said that, an extremely quiet first half of the tropical season does not guarantee an uneventful second half…indeed, there are some signals that activity will pick up later this month.
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On the heels of a frontal passage, the first half of the new work week should be quite comfortable in the Mid-Atlantic region with low humidity values. High pressure to our northwest will be in control and today will feature quite breezy conditions with a stiff northerly flow of refreshing air. Another cold front could bring showers to the area late in the week or early in the upcoming weekend.
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A cold frontal system is pushing through the region today and there will be plenty of clouds and maybe a couple more showers in the area. A disturbance form the Tennessee Valley will push northeastward into the Mid-Atlantic region this weekend and the result will be additional showers and possible thunderstorms…some of the rain can be heavy. Some improvement is likely later Sunday and the new work week should start with plenty of sunshine on Monday and Tuesday and moderately warm conditions.
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A weak cold front will approach the area today and it can produce a couple of showers around here and an isolated PM thunderstorm is possible. The front should clear the coast on Friday morning paving the way for a comfortably warm end to the shortened work week and some clearing skies likely in the afternoon with temperatures peaking near the 80-degree mark. Another disturbance will arrive this weekend and it can cause showers and thunderstorms in the Mid-Atlantic region from Saturday into Sunday.
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