High pressure builds into the Mid-Atlantic region today and will provide us with dry and increasing warm conditions through the end of the work week. Temperatures will likely peak in the lower 70’s this afternoon and not far from 80 degrees on Thursday and then the low-to-mid 80’s on Friday. Low pressure to our west this weekend may be close enough to give us an increasing chance of showers on Saturday and then another chance of showers likely comes on Monday with the arrival of a frontal system.
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Low pressure will ride from NW-to-SE today along a frontal boundary zone bringing us a good chance of showers during the morning and mid-day hours, maybe a thunderstorm as well. It’ll also be cooler than yesterday with highs today confined to the lower 60’s. High pressure will build back into the region on Wednesday and the second half of the work week is looking quite nice with dry and increasingly warm conditions. The weather likely becomes more unsettled this weekend with a returning chance of showers and thunderstorms.
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While it won’t be a widespread or long-lasting event, a fast-moving low pressure system will pack a little bit of a punch on Tuesday and it could produce some decent rainfall for a limited portion of the Mid-Atlantic region. The best chance for the locally heavy rainfall will likely extend from the southwestern part of Pennsylvania to the DC metro region and then eastward to the Delmarva Peninsula and southeastern Virginia. In addition to the production of some rainfall, this system will bring cooler conditions to the Mid-Atlantic region on Tuesday with and east-to-northeast low-level flow of air likely to develop on the north side of the southeastward-moving storm system.
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A frontal system dropped into the region last night from the north and it will stall out today across central Virginia. The day will start off with some patchy fog and an isolated shower, but then it’ll become partly sunny and warm with afternoon highs not far from 80 degrees. Low pressure Low pressure will ride along the frontal boundary zone later tonight and Tuesday bringing us a good chance of showers, maybe a thunderstorm or two and some of the rain can be heavy at times. High pressure takes over at mid-week and the second half of the week is looking dry and warm.
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An upper-level low pressure system continues to push slowly away from the coast and high pressure will build into the region for the weekend. As a result, today will be a bit on the cool side of normal and Saturday is likely to be the nicest day in quite awhile across the Mid-Atlantic region. The weather for Sunday and Monday should feature comfortably warm conditions, but a couple of disturbances can bring scattered showers to the region on both days, maybe even a thunderstorm or two. Showers and thunderstorms are even more likely on Tuesday with the approach of a frontal system and it should turn cooler again by the middle of next week.
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Temperatures will remain below-normal for the next couple of days in the Mid-Atlantic region as an upper-level low slowly pulls away from the Northeast US coastline. Cold air in the upper atmosphere will continue to keep it somewhat unstable around here; consequently, there can be mid-day or afternoon scattered showers for another day. The weekend is shaping up to be quite nice with quieter and milder conditions as high pressure to the north takes control of the weather in the Mid-Atlantic region.
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An unusually cool air mass remains entrenched in the Mid-Atlantic region and an upper-level low spinning overhead will keep it quite unsettled here at mid-week. With cold air aloft, any daytime heating will quickly result in destabilization of the atmosphere leading to clouds, scattered rain showers and perhaps even a rumble of thunder. The air is cold enough that some higher-elevation spots to the north and west can experience ice pellets or graupel mixed in with the rain later today and early tonight. The weather gets quieter and milder at the end of the week and the weekend is shaping up quite nicely.
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An unusually cool air mass for early May has engulfed much of the northeastern quadrant of the nation and it’ll stick around for a few more days. The Great Lakes, Midwest, Mid-Atlantic and Northeast US will be stuck with well below-normal temperatures through much of the remainder of the week with a deep upper-level low pressure system spinning around overhead. With cold air aloft, any daytime heating early in the day will quickly result in destabilization of the atmosphere leading to clouds and scattered rain showers. The air is cold enough that some higher-elevation interior locations of the Mid-Atlantic and Northeast US can even experience ice pellets (graupel) and/or snowflakes mixed in with the rain during the next couple of days. The weather gets quieter and milder at the end of the week.
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After back-to-back soaking rain events, the Mid-Atlantic region will experience quite cool and unsettled conditions for much of this week with a daily chance of showers. An upper-level low will spin around the northeastern states in coming days and cold air aloft will result in instability in the atmosphere leading to the daily chance of patchy clouds and showers. The air mass in the northeastern part of the country during the next few days will feature well below-normal temperatures for the early part of May. Winds will also be quite noticeable during each of the next few days with gusts to 30 mph possible.
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Rain associated with a northeastward moving storm system has spread into the DC metro region and it’ll continue into the day on Saturday. Some of the rain will be heavy at times, watch out for localized flooding, and winds will increase in strength from an east-to-southeast direction. In fact, at the height of the storm, flooding may become an issue along coastal sections of the Chesapeake Bay and Delmarva Peninsula given the fact that a stiff E-SE flow will continue for a several hour period.
By the time we get to the second half of the weekend, a multitude of upper-level lows will begin to consolidate into one as the northernmost system will become the dominant player and acts to “absorb” the other lows. The end result will be one deep upper-level low by the early part of next week centered over the eastern Great Lakes. At the surface (and very similar to the first system on Friday and Saturday), an initial (primary) low will push towards the Great Lakes and a secondary storm will form near the Mid-Atlantic coastline by late Sunday night/early Monday. As with the first event, this second one will result in soaking rains for the DC metro region and winds will become quite a noticeable factor as well. An unusually chilly air mass for early May will follow the second storm for the first half of next week and instability showers may take place from time-to-time.
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