The combination of an upper-level trough, a slow-moving surface frontal system, and an extremely humid air mass will result in strong-to-severe thunderstorms later today and early tonight and there can be a repeat performance later tomorrow. Any shower or thunderstorm in this tropical air mass can produce flooding rainfall given the well saturated nature of the grounds in the Mid-Atlantic region. Temperatures today have soared to 90+ degrees all along the DC-to-Philly-to-NYC corridor and the high humidity is making for a very uncomfortable day. The unsettled weather pattern continues from Thursday into Sunday with a daily shot at showers and thunderstorms.
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Tropical air is in place across the region and an upper-level trough of low pressure will combine with a slow-moving surface frontal system to enhance upward motion during the afternoon and evening hours. This combination of ingredients can lead to severe thunderstorms for later today and early tonight and tropical downpours can cause flash flooding given the already well saturated grounds. The unsettled weather pattern will continue through the second half of the week with a daily shot at additional showers and thunderstorms and some of that rain is likely to be heavy at times. .
As far as temperatures are concerned, today could turn out to be the hottest day of the week with afternoon highs near the 95-degree mark. The heat today combined with the high humidity will make for very uncomfortable conditions all along the DC-to-Philly-to-NYC corridor. The remainder of the week is likely to feature temperatures a bit more limited around here compared to today with 90 degrees the likely afternoon high.
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A very unsettled stretch of weather is in store for the Mid-Atlantic region with a shot of showers and thunderstorms on a daily basis right into the upcoming weekend. The rainfall during the next few days will be enhanced by a tropical air mass that pushed northward this weekend along with the remnants of Tropical Storm Chantal. In addition, a slow-moving upper-level trough of low pressure now centered over the Great Lakes will enhance upward motion in the Mid-Atlantic region between now and mid-week. As a result, tropical downpours are possible during each of the next few days which can bring flash-flooding conditions to portions of the Mid-Atlantic region with today’s greatest concern centered around the Chesapeake Bay region. Any thunderstorm from later today into the mid-week can reach strong-to-severe levels with perhaps the highest risk of severe weather coming on Tuesday afternoon and evening.
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After a dry and warm holiday weekend, the weather will turn noticeably more humid today with an influx of tropical moisture from the remains of Tropical Storm Chantal which formed during the weekend over the western Atlantic. The week as a whole will be very unsettled with the daily chance of showers and thunderstorms…some of the storms can be strong and some of the rain will be heavy at times. High pressure ridging that has been in control will retreat offshore today as low pressure troughing develops across the Midwest/Great Lakes region and combines with a tropical air mass to influence our weather.
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A cold front will drop southeastward today through the northeastern part of the country and it can set off a late day/early evening shower across the far northern suburbs. High pressure builds into the area on Friday and the 4th of July holiday should turn out to be very nice with comfortably warm conditions, lower humidity, and plenty of sunshine. The weekend looks good as well with warm and dry conditions on both days and plenty of sunshine. Warmer, more humid, and unsettled weather conditions will return to the Mid-Atlantic region early next week.
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The cold front that pushed into the Mid-Atlantic region during the overnight hours will hang up for a bit along the eastern seaboard resulting in plenty of clouds this morning and the chance of lingering showers and thunderstorms. High pressure will take control of the weather later today and then a weak cold front will arrive late in the day on Thursday with an isolated shower or two possible. Following the passage of the weak cold front, the Independence Day holiday on Friday should turn out to be very nice in the Mid-Atlantic region with plenty of sunshine, low humidity, and comfortably warm conditions and that nice weather should continue for much of the upcoming weekend as well.
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There were strong-to-severe thunderstorms yesterday afternoon and last night across portions of the Mid-Atlantic region and there can be a repeat performance later today and tonight across an even more widespread area. The combination of an incoming surface cold front, strong and intensifying upper-level support, increasing wind shear, and an entrenched warm and very humid air mass will help to destabilize the atmosphere this afternoon. Showers and thunderstorms should increase in coverage and intensity during the mid-day and early afternoon hours across central and western sections of the Mid-Atlantic and then these storms will trek to the east and likely reach the DC-to-Philly-to-NYC corridor during the mid-to-late afternoon/early evening hours (2-9pm timetable). Some of the storms are likely to reach strong-to-severe levels producing torrential rainfall/flash flooding, and potentially damaging wind gusts. The frontal system will hang up for awhile on Wednesday morning near the east coast and there can be lingering showers and thunderstorms along the immediate I-95 corridor and points from there to the coastal sections of New Jersey and the Delmarva Peninsula.
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A “conventional” surface cold front will approach the area later today from the northwest (last week’s “back door” cold front moved from northeast-to-southwest). In addition, an upper-level trough will shift eastward into the Mid-Atlantic region, intensify and enhance upward motion all along the I-95 corridor. Given the combination of these systems and the entrenched heat and humidity, showers and thunderstorms will reform this afternoon and there is the risk that some of the storms will reach strong-to-severe levels containing torrential rainfall/flash-flooding and damaging wind gusts.
High pressure will take control of the weather on Wednesday and then a weak cold front will arrive late in the day on Thursday with an isolated shower or two possible. Following the passage of the weak cold front, the Independence Day holiday on Friday should turn out to be quite nice in the Mid-Atlantic region with plenty of sunshine, lower humidity, and comfortably warm conditions and that nice weather should last into at least the first part of the upcoming weekend.
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There was a break in the action on Sunday across the northern Mid-Atlantic region, but strong thunderstorms hit many spots across southern sections to close out the last weekend of June. The threat of showers and thunderstorms will become quite high throughout the entire Mid-Atlantic region from later today into tonight, and this threat will continue Tuesday and Tuesday night...both time periods will come with the risk of strong-to-severe thunderstorms. The combination of a stationary front that turns around later today and pushes northward as a warm front, and the approach of a cold front later tomorrow will keep it unsettled around here, and any thunderstorm on either day can produce torrential rainfall and damaging wind gusts. High pressure pushes in for the mid-week and then a weak cold front comes through late Thursday paving the way for a very nice Independence Day holiday on Friday featuring plenty of sunshine in the Mid-Atlantic region, lower humidity levels, and comfortably warm conditions.
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A couple of frontal systems will keep it unsettled around here for the next couple of days and temperatures will run at very warm levels. A warm front pushes northward through the region today and then a cold front approaches from the northwest on Tuesday. There can be showers and thunderstorms both today and tomorrow with these two systems and any storm can be on the strong-to-severe side with torrential rainfall and damaging wind gusts on the table. High pressure will follow the passage of the cold front at mid-week and then a weak front comes through late Thursday leading to a nice 4th of July holiday on Friday plenty of sunshine, warm and less humid conditions.
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