The grass will certainly get off to a good start in the Mid-Atlantic region over the next few weeks as water will be quite plentiful – much as it was for all of the last growing season. The Mid-Atlantic region will get hit by back-to-back rain events in coming days and each one can result in some heavy downpours and perhaps even some strong thunderstorm activity. Looking ahead, there is even a good chance at a third significant rain event at the end of the next week for much of the eastern US including the Mid-Atlantic as the overall wet pattern shows no sign of slowing down.
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Low pressure will head over the Great Lakes region today and it’ll push a couple of frontal systems our way as we close out the work week. A few showers are likely later today, but the main rain threat is coming tonight and there can be a thunderstorm mixed in as well - some of the rain can be heavy at times. Clouds and sun on Saturday ahead of the next low pressure system and a couple of lingering showers are possible to go along with quite warm afternoon temperatures. More rain is likely here from later Sunday into Monday and this next event can also result in some heavy rainfall in the Sunday overnight hours.
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High pressure will push off the east coast later today, but it should remain close enough for another rain-free day in the Mid-Atlantic region. Low pressure will move through the Great Lakes region on Friday and generate a round of showers here on Friday night along with the chance for scattered thunderstorms. The weekend is not looking too good as clouds will dominate on Saturday and lingering shower activity is likely. Another system will bring more rain here later Sunday into Monday and some of it can be heavy at times late Sunday night/early Monday.
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A cold front crossed the region late yesterday and ushered in slightly cooler air for the mid-week with high temperatures likely to be in the upper 60's later this afternoon compared to near 80 degrees on Tuesday. After a decent day on Thursday, another frontal system will head our way on Friday and there will likely be another round of showers and possible thunderstorms on Friday night which should be followed by high pressure for Saturday and then more rain is likely from later Sunday into early Monday.
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A cold front will cross the region later today and there is the chance for an afternoon shower or thunderstorm. The frontal passage will usher in colder air for late tonight and Wednesday with high temperatures likely to drop from near 80 degrees today to the lower 60’s tomorrow. Another frontal system will arrive late Friday and there will likely be a round of showers and thunderstorms to end the work week which should be followed by high pressure for Saturday, but then more rain is likely on Sunday.
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It is perhaps not too surprising that today’s warm up is leading to some instability in the atmosphere and the result could be an evening thunderstorm anywhere along the DC-to-Philly corridor. Some of the storms can even reach strong levels with the greatest likelihood for that just to the southeast of DC and across the Delmarva Peninsula. At 2PM temperatures ranged from 80 degrees at Dulles to 77 degrees in Philly and the wind is pretty gusty at times out of the southwest. A mesoscale analysis of the surface lifted index in Mid-Atlantic indeed shows some instability in the DC-to-Philly corridor and latest radar echoes are increasing in intensity and coverage across West Virginia and southern Pennsylvania.
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After a decent and mild weekend, it'll turn even warmer as we begin the new work week with afternoon highs well up in the 70's. There can be a few showers and thunderstorms later today, tonight and on Tuesday, but much of the time will be rain-free. A cold front will usher in cooler air for the mid-week and then another system could bring us more rain by late Friday or Friday night.
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High pressure is pushing off the coast this morning and a slow-moving low pressure system will impact the region with some rainfall into the late night hours and it’ll be noticeably cooler as we close out the work week. This late week system looks like it will get out of here just in time to squeeze out a pretty decent-looking mainly dry and noticeably milder weekend before another system impacts the region early next week. It’ll turn even warmer on Monday and Tuesday and the combination of a warm front and a cold front will likely result in occasional showers on both days and perhaps a few thunderstorms mixed in as well.
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A slow-moving low pressure system will impact the region with some rainfall from later tonight into late tomorrow night and it’ll get a bit cooler as we close out the work week. The late week system looks like it will get out of here in time to squeeze out a pretty decent weekend before another system produces more rain in the area from later Sunday night into Tuesday.
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The month of April began with a colder-than-normal air mass in the eastern US and it looks like we’ll have additional cold air outbreaks over the next couple of weeks or so. Teleconnection indices such as the Arctic Oscillation (AO) and North Atlantic Oscillation (NAO) both signal a sharp drop in coming days to negative territory which typically results in the penetration of cold air outbreaks from central Canada into the eastern US. Medium-range forecast maps of 500 mb height anomalies support this notion of additional cold air outbreaks as we progress through the month of April with “high-latitude blocking” in evidence over northern Canada and Greenland.
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