There is a surface low pressure system this morning near the Outer Banks of North Carolina and satellite imagery clearly shows an upper-level low spinning over the central part of the same state. This upper-level has resulted in substantial rainfall in recent days across the Carolinas and westward to West Virginia and southwestern Virginia and it is about to finally make a move to the next. As a result of this movement, showers will move into the DC metro region later today and likely edge into Philly later tonight or early Thursday and once the threat of rain arrives, it’ll likely stick around all the way into next week. In fact, another significant upper-level trough of low pressure is likely to push into the Great Lakes/Mid-Atlantic/NE US by the middle of next week and this will more than likely continue the wet pattern that is unfolding for this part of the nation.
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Our stretch of nice weather with rain-free conditions and comfortable temperatures and humidity levels is about to end. High pressure that has been to our north in recent days will shift off the east coast over the next 24 hours and this shift in location will open the door for much more humid air to push into our region and with it will come the threat of showers and thunderstorms. The chance for showers here will increase by later tonight and that threat of rain will stick with us all the way into the first half of next week and there can be thunderstorms mixed in as well.
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High pressure to our north continues to control the weather around here and it’ll produce another couple of comfortable days in the region. This system will push off the coast on Wednesday and this shift in location will open the door for warmer, more humid air for the latter part of the week and a renewed threat of showers and thunderstorms. The threat for rain looks like it’ll return here by Thursday and then last through the upcoming weekend on the backside of the soon-to-depart high pressure system.
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High pressure to our north will control the weather around here through mid-week and it’ll stay quite comfortable for a couple more days. The high pressure system will shift off the coast at mid-week and this will begin a warm up for the second half of the week. Temperatures should hold in the 70’s for highs for the next two days, but then reach 80 degrees at mid-week and well up into the 80’s by later in the week.
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A cooler-than-normal air mass will push into the region early this weekend resulting in very comfortable temperatures for the weekend and also for the first half of next week. While there will be plenty of sunshine during the weekend and the early part of next week, the atmosphere will become somewhat unsettled given the unusually cool air aloft and this can result in a shower from time-to-time. High pressure to our north will be the main player this weekend and early next week and there will be an upper-level trough slowly dropping southward into the Carolinas.
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A slow-moving cool front will bring us occasional showers today and there can be a strong thunderstorm mixed in as well. A cooler-than-normal air mass will push into the region early this weekend resulting in comfortable temperatures for the weekend and the first half of next week. The atmosphere will become increasingly unsettled, however, with the combination of cool air aloft and a slow-moving upper-level trough moving in overhead. Showers cannot be ruled out later Saturday and there is a likelihood for showers on Sunday, Monday and perhaps Tuesday as well.
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Low pressure over the Great Lakes region will intensify today and a trailing cold front will approach our area from the northwest. The approach of the front will increase the chance of showers and thunderstorms around here by day's end and it'll keep it unsettled tonight and on Thursday as it drags very slowly through the region. A cooler-than-normal air mass will push into the region early this weekend resulting in more comfortable weather conditions on Saturday and Sunday and the cooler-than-normal weather will stick around into the early part of next week. With cooler air aloft, the weekend and early part of next week will become somewhat unsettled and showers will likely be a threat on Saturday, Sunday and Monday.
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High pressure will push off the coast today and this will allow for much warmer air to move into the Mid-Atlantic region from the southern states. A frontal system will approach the area late Wednesday and increase the chance of showers and thunderstorms and then this same front will stall out in the area and weaken later in the week. Another frontal system will follow early this weekend and it can bring us a chance of showers and thunderstorms on either weekend day.
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A “derecho” is defined as a widespread, long-lived wind storm associated with bands of quickly moving showers and thunderstorms. Although a “derecho” can produce destruction similar to that of a tornado, the damage typically occurs in one direction along a relatively straight path. By definition, if the extent of wind damage is for more than 250 miles, includes wind gusts of at least 58 mph along its path, and also includes several, well-separated wind gusts of 75 mph or greater, then the event may be classified as a “derecho”. One such event took place last Wednesday, June 3rd, across much of Pennsylvania and New Jersey - and some are still feeling the impact.
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High pressure will control the weather today in the Mid-Atlantic region and provide us with plenty of sunshine and comfortable conditions, but it’ll turn warmer on Tuesday after it shifts off the east coast. A cold front will then approach from our northwest on Wednesday night – perhaps accompanied by showers and thunderstorms – and then it may stall out and slowly weaken around here later in the week. Another cold front is likely to arrive from the northwest early in the weekend. Elsewhere, the remains of Tropical Storm Cristobal will push northward over the next few days producing heavy rainfall all along the Mississippi Valley from the Gulf of Mexico to the Canadian border.
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