A strong cool front will cross the Mid-Atlantic region late today and it is likely to generate another round of showers and thunderstorms; primarily, focused in the period from mid-afternoon to early evening. Some of the storms late today can be strong-to-severe with the highest chance for severe weather along and to the south and east of I-95. High pressure will follow the passage of the cool front on Wednesday, but additional frontal systems will keep it somewhat unsettled later in the week.
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Heavy rain and severe thunderstorms rocked the Mid-Atlantic region last Monday and a somewhat similar overall weather pattern can bring a repeat performance from late today into Tuesday. In a situation like a week ago, several ingredients will come together in the atmosphere that will raise the chance for heavy downpours and severe thunderstorms which can produce damaging wind gusts, hail and even isolated tornadoes. These ingredients include a vigorous upper-level low that is currently pushing eastward across the Upper Mississippi Valley, copious amounts of available moisture, strong jet streaks at multiple levels of the atmosphere, and a strong surface cool front that ultimately crosses the Mid-Atlantic region late Tuesday. The time period for the potential heavy downpours and severe thunderstorms will be from late today into Tuesday night.
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A warm front arrives in the region later today and a strong cool front will cross the area on Tuesday. The combination of these two systems and other ingredients in the atmosphere will once again raise the chance of some heavy rainfall around here from early tonight into Tuesday and there is the threat of strong-to-severe thunderstorm activity with damaging wind gusts a risk. Following the passage of the cool front, the second half of the week will likely be rather quiet for a change featuring generally warm and dry conditions.
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Drier air returns to the Mid-Atlantic region on Friday as high pressure edges its way into the area and temperatures will be comfortably warm. The weekend will feature warm conditions and a weak frontal system can cause some shower and thunderstorm activity late tomorrow and tomorrow night. Any shower or thunderstorm that forms on Saturday can produce heavy rainfall. A stronger cool front will approach from the northwest early next week and it could produce a round of showers and thunderstorms around here on Monday night.
Note – Perseid meteor shower peaks late Saturday night into early Sunday morning
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Low pressure will pass through the region later today bringing with it occasional rain and possibly a strong PM thunderstorm or two. The rain will likely reach the area by late this morning and continue into the early evening hours. In South Philly, where it was a special night for the Phillies on Wednesday, rain could end in time for the Phils and Nats to play ball later in the evening. High pressure will follow for the last day of the work week producing warm and dry conditions across the Mid-Atlantic. The weekend will feature warm conditions and primarily rain-free; however, a few showers are possible late Saturday and Saturday night and maybe a thunderstorm. Looking ahead, a potent system may reach the Mid-Atlantic region late Monday raising the chances (once again) for heavy showers and strong-to-severe thunderstorms.
Note- the Perseid meteor shower peaks late Saturday night into early Sunday morning
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A widespread severe wind event rocked the Mid-Atlantic region this past Monday and a key ingredient was a vigorous wave of low pressure aloft that crossed the Great Lakes on a path towards the northern Mid-Atlantic. Other ingredients included multiple jet streaks in the atmosphere, a strong surface cool front, and an influx of very moist air from the southeastern states on the front side of the front. A similar overall weather pattern may repeat itself from later Monday into Monday night. While still several days away, many of these same factors may indeed come together early next week and the result can be another round of heavy showers and strong-to-severe thunderstorms for the Mid-Atlantic region.
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High pressure pushed into the Mid-Atlantic region on Tuesday and it will stay in control for another day here at mid-week. A frontal system will arrive on Thursday and there will be occasional rain with possible thunderstorms. Some of the rain that falls on Thursday can be heavy at times and some of the storms can be strong. Drier air returns for Friday and the weekend looks to feature quite warm conditions with just a chance for a few showers on Saturday night. Looking ahead, a potent system may reach the Mid-Atlantic region late Monday raising the chances (once again) for heavy showers and strong-to-severe thunderstorms.
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After a severe wind event rocked the Mid-Atlantic region late yesterday, the weather will calm down today as high pressure edges in this direction. Winds will increase today as partial sunshine develops and the humidity levels will drop to much more comfortable levels. High pressure is to stay in control of the weather at mid-week and then another disturbance arrives later in the day on Thursday with a renewed threat of showers.
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The severe weather threat is increasing across Maryland, Virginia and the Washington, D.C. metro region where skies have cleared allowing for temperatures to climb well up into the 80’s. Clouds should thin out across southern PA during the next couple of hours. This daytime heating is helping to destabilize the atmosphere setting the stage for what appears to be a widespread severe wind event later today into early tonight across Maryland, Virginia and Washington, D.C. and it is likely to extend up across much of southern PA including the Philly metro area. In addition to the low-level heating, ingredients include ample available moisture and powerful jet streaks at multiple levels of the atmosphere (e.g., 250 millibars, 850 millibars). The potential exists for wind gusts to reach into the 60-75 mph range with power outages on the table. Tornadoes are also in the picture during this weather event…expect a tornado watch to be issued shortly for many areas. The likely timetable for the severe weather in the DC-to-Philly corridor is 4-8pm.
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A very active beginning to the week as a potent system crosses the Ohio Valley and enhances upward motion in the Mid-Atlantic region. The result will be occasional showers and embedded thunderstorms…some of the rain can be heavy at times and some of the storms can reach severe levels with damaging wind gusts a threat…maybe even an isolated tornado. High pressure will return for the mid-week period before somewhat unsettled weather heads this way later in the week.
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