Strong high pressure shifts offshore today and this will result in a warming trend for the Mid-Atlantic region. Temperatures can climb to the 80 degree mark today to go along with plenty of (hazy) sunshine and then soar to the middle and upper 80’s on Wednesday and Thursday...a few spots can top out at 90 degrees. The weather turns more unsettled again for the end of the week and the early part of the weekend with an approaching frontal system and an increasing chance of showers and thunderstorms.
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Strong high pressure builds just to the south of here today and it’ll be in control of the weather for the next few days. As it gradually slides to the south and east, a warming trend will get underway and temperatures will climb from a chilly start to the day this morning to the upper 80’s for afternoon highs on Wednesday and Thursday. The weather becomes somewhat unsettled late in the week with a weak upper-level trough forming in the eastern states.
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A heavy rain event is headed to the Mid-Atlantic region with as much as 3 or 4 inches on the table in some spots...
A cold front will stall-out in close proximity later today and low pressure will form along its boundary zone. As a result, showers and thunderstorms are likely to impact the region from later today into later Saturday...some of the rain will be heavy at times and some of the thunderstorms can be strong-to-severe with damaging wind gusts and possible hail. Another cold front will cross the region late tomorrow sweeping away the unsettled weather and it’ll turn drier on Sunday with plenty of sunshine to go along with windy and cooler-than-normal conditions for the first day of June. The first half of next week looks dry as well with increasingly warm conditions leading to high temperatures well up in the 80’s by mid-week.
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The 2025 Atlantic Basin tropical season officially gets underway on Sunday, June 1st, and there are signs that the initial threat could come as early as ten days or so from now (i.e., June 8, 9, 10th time frame). A teleconnection index known as the Madden-Julian Oscillation or MJO appears to be foreshadowing the potential of tropical troubles in this time frame as it transitions into a “phase” that is generally quite favorable for activity in the Atlantic Basin. In addition, a second favorable sign may be the evolution of the upper-level pattern of highs and lows across North America which may feature strong ridging over southeastern Canada in about ten days or so. A strong ridge in this part of North America is often favorable this time of year for an “undercutting” tropical system in the southwestern Atlantic, Gulf of America, or Caribbean Sea where sea surface temperatures are generally warmer-than-normal.
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It’ll turn warmer today following the unseasonably cool weather conditions on Wednesday and this afternoon’s high temperatures should end up in the low-to-mid 70’s. Skies will be mainly cloudy this morning and then some brightening for the mid-day and afternoon hours. A cold front will cross the region tonight with a few showers possible and then it’ll stall nearby on Friday. Low pressure will then ride up along the stalled-out frontal boundary zone bringing with it more rain and possible thunderstorms to the Mid-Atlantic region from later Friday into Saturday….some of the rain can be heavy and some of the storms can be strong. Another cold front arrives late Saturday sweeping the unsettled pattern away and the overall pattern turns drier and increasingly warm during the early part of next week (which is the beginning of the month of June).
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Low pressure is intensifying near the Mid-Atlantic coastline this morning and it will keep it breezy and quite cool around here through tonight with periods of rain. This system will push away on Thursday, but a cold front will approach and then stall in the area for the late week. There can be a few showers from Thursday into Friday and then a period of steadier (and more beneficial) rain is likely from late Friday into Saturday as low pressure forms along the stalling-out frontal boundary zone. Temperatures will be well below-normal today with an ocean flow of air and will remain slightly below-normal right into the weekend. The pattern looks like it’ll turn warmer and drier as we transition to the beginning of June on Sunday and into early next week.
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Recent rain events in the Mid-Atlantic region have helped to alleviate drought conditions that began to develop last fall and more beneficial rainfall is on the way with two storm systems. Clouds will lower and thicken today as high pressure shifts off to the east of here and low pressure pushes into the Ohio Valley. A new low pressure system will form by early tomorrow near the Mid-Atlantic coastline and it will produce periods of rain for the mid-week and quite cool conditions as a low-level ocean flow of air forms in the DC-to-Philly-to-NYC corridor. In fact, temperatures may end up being some twenty degrees below-normal on Wednesday with the influence of the still chilly western Atlantic Ocean. A cold front then pushes through the region on Thursday night with a few showers and stalls in the area on Friday. Another low pressure system will likely ride up along that stalled-out boundary zone potentially bringing another round of soaking and beneficial rainfall to the Mid-Atlantic region from late Friday into Saturday.
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More beneficial rainfall is headed to the Mid-Atlantic region…high pressure shifts to our east today and low pressure will make a move up the Ohio River Valley and then a new low pressure system will form near the Mid-Atlantic coastline. As a result, rain can push into the area later tonight and the mid-week will feature periods of rain and quite cool conditions as the result of an ocean flow of air. A cold front can produce more shower activity in the region later in the week and even a period of steadier rain is possible from later Friday into Saturday. Temperatures will be well below-normal for the next couple of days for the latter part of May and remain a bit below-normal as we head into the weekend.
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Tropical moisture continues to flow up along the eastern seaboard and it is accompanied by a slow-moving upper-level low pressure system. The result here will be another couple of days with occasional showers and thunderstorms can get into the mix as well. After this upper-level low finally “opens up” and exits off to the north and east later in the week, there can be a lull in the action for a brief time. However, another low pressure system will head towards the Great Lakes by the end of the week and it will throw a couple of fronts our way between later Friday and Saturday night. As a result, there will be a renewed threat of showers and thunderstorms from later Friday into Saturday and then drier air should finally return to the region for Sunday and Monday.
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A plume of tropical moisture is flowing northward today along the eastern seaboard and this widespread area of moisture is supported aloft by a slow-moving and vigorous upper-level trough of low pressure. The end result here will be another extended period of showers from today through Thursday and there can be an isolated thunderstorm or two mixed in as well. At week’s end, another system over the Great Lakes will throw a couple of fronts our way and this will renew the threat of showers here from late Friday into Saturday and perhaps even a few strong thunderstorms as well.
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