Another period of unsettled weather is coming to the Mid-Atlantic region from later today through tomorrow night and it can include some heavy rainfall and strong thunderstorm activity. A weak frontal boundary zone will stall out in the Mid-Atlantic region today and a strong cold front approaches later Thursday. The stalled-out boundary zone will be the focus of any shower or thunderstorm activity that forms later today and tonight and then low pressure will develop nearby on Thursday enhancing the chance of showers and potentially strong-to-severe thunderstorms. High pressure will take back control by the time we get to the weekend which is shaping up to be quite nice in the Mid-Atlantic region.
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Hot weather dominated the scene today across the Mid-Atlantic and Northeast US and one of the ways to get relief is from a “conventional” cool frontal system that passes from west-to-east. However, long-time residents of the Mid-Atlantic and Northeast US know that one other way to get a break in the heat is for a back door cool front to slide from northwest-to-southwest which can produce dramatic temperature changes in a short period of time. That is exactly what happened today in Boston with a temperature drop of nearly 20 degrees in about 10 minutes and a big change is in store on Wednesday for New York City and New Jersey.
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A hot day begins the holiday-shortened week in the Mid-Atlantic region with high temperatures this afternoon in the lower 90’s. A cold front approaches the region later tomorrow bringing with it a chance of showers and thunderstorms. This front will tend to stall out by Thursday and an area of low pressure will ride along the boundary zone likely resulting in additional shower and thunderstorm activity. High pressure is likely to take control of the weather as we get to the weekend which may turn out to be quite nice with comfortably warm temperatures.
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The combination of an increasingly humid air mass, strong surface frontal system and a vigorous mid-level low will help to generate numerous showers in the Mid-Atlantic region from today into tonight and possible severe thunderstorms. In fact, there may be two bands of thunderstorms to closely monitor during this event- one during the mid-day/early afternoon hours and a second during the late evening. The main severe weather parameter threats will be damaging wind gusts and “flash-flooding” downpours., and isolated tornadoes are also on the table. The upper-level low will be rather slow-moving in an easterly direction and this will result in an unsettled weather day on Saturday with scattered showers and isolated thunderstorms. The upper-level will then exit off the coast by Sunday resulting in improvement to end the weekend and the weather on Monday, Memorial Day, should feature plenty of sunshine, very warm conditions, and highs well up in the 80’s.
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The combination of an increasingly humid air mass, strong surface frontal system and a vigorous mid-level low will help generate numerous showers on Friday and Friday night in the Mid-Atlantic region and possible severe thunderstorms. In fact, there may be two bands of thunderstorms to closely monitor during this event- one during the mid-day/early afternoon hours and a second during the late evening associated with the frontal passage. The main severe weather parameter threats will be damaging wind gusts, “flash-flooding” downpours, and isolated tornadoes are even possible. The upper-level low will be rather slow-moving from west-to-east and this is likely to result in an unsettled weather day on Saturday in the Mid-Atlantic region with scattered showers and strong thunderstorms. The upper-level will exit off the coast on Sunday resulting in improvement to end the weekend and the weather on Monday, Memorial Day, should feature plenty of sunshine, very warm conditions and highs well up in the 80’s.
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A strong frontal system will produce another round of showers and thunderstorms in the Mid-Atlantic region from Friday into Friday night and some of the storms can be on the strong-to-severe side with heavy downpours. The upper-level support for this system will be slow-moving and could result in some residual shower activity on Saturday as it drifts overhead and a thunderstorm is possible as well, but the day will not be a washout. This upper-level low will exit off the coast by Sunday resulting in improvement and then the weather on Monday, Memorial Day, should feature plenty of sunshine and highs well up in the 80’s.
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A strong frontal system will produce another round of showers and thunderstorms in the Mid-Atlantic region on Friday and some of the storms can be on the strong-to-severe side. The upper-level support for this system will be slow-moving and could result in some residual shower activity on Saturday in the Mid-Atlantic region as it drifts overhead. This upper-level low will exit off the coast on Sunday resulting in improvement and then the weather on Monday, Memorial Day, should feature plenty of sunshine and highs in the 80’s.
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High pressure will continue to produce a low-level flow of air today out of the east and this will keep a cap on temperatures despite the return of some sunshine. It’ll turn warmer and more humid by late in the work week ahead of the next cold front and that system is likely to bring us another round of showers and thunderstorms…some of those storms later Friday can be on the strong side. The upper-level system associated with the cold front will linger for awhile this weekend and showers will remain a threat on Sunday. Conditions should improve on Sunday and then Monday, Memorial Day, is likely to turn out mainly sunny and quite warm with highs in the 80’s.
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Low pressure will pull away from the region this morning, but the day will still feature plenty of clouds, cool conditions and an isolated shower or two. In fact, it stays on the cool side of normal for the next few days with an easterly flow of air putting a cap on temperatures in the Mid-Atlantic region. It does turn warmer on Friday ahead of the next cold front which could bring with it another round of showers and strong thunderstorms at the end of the work week. There is a chance that the late week frontal passage paves the way for the bulk of the Memorial Day weekend to feature decent weather, but still a few questions have to be ironed out.
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A much different air mass has pushed into the Mid-Atlantic region following the passage of a strong cold front late yesterday that included some strong-to-severe thunderstorm activity. Today will be cooler and noticeably less humid than yesterday and the overall cool pattern will last through the week. Low pressure to our south will approach the area tonight and rain is likely and some of it can be heavy…watch for localized flooding. Showers may start the day on Tuesday and there can be a shower or two at mid-week as well. Another strong cold front will impact the region by the end of the work week leading into the Memorial Day weekend.
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