A major-league cool-down is coming to the Mid-Atlantic region and the transition from the high heat and humidity to the well below-normal temperatures will come with heavy rainfall, strong-to-severe thunderstorms, and localized flash flooding. A slow-moving cold frontal system will approach the area later today from our north and west, but then only be able to inch its way through the Mid-Atlantic region during the next 24 hours as low pressure forms along its boundary zone. Widespread showers and thunderstorms are likely from early this afternoon into the late-night hours and total rainfall amounts can end up being excessive in some spots raising the concern for potentially significant flash flooding. Much cooler air moves in on Friday on the back side of the slowly departing cold front and low pressure system and we are setting up for one of the nicest weekends of the summer season with very comfortable temperatures and humidity levels.
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Today begins a transition in the Philly metro region from the high heat and humidity of the past few days to much cooler conditions expected here on Friday...the first day of August. A cold front will slowly grind its way through the area later today and tonight as low pressure forms along the boundary zone. Showers and thunderstorms will become numerous for the afternoon and nighttime hours…some of the rain is likely to be heavy at times, some of the storms can be strong, and localized flash flooding is on the table. Showers can linger on Friday morning and the day will be noticeably cooler (jacket weather) with well below-normal temperatures. In addition, an east-to-northeast wind will be quite noticeable in the counter-clockwise flow of air around departing low pressure off the coast. Clearing skies should develop on Friday night and the first weekend of August may turn out to be one the nicest of the entire summer season featuring very comfortable temperatures and low humidity values.
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Temperatures on Tuesday afternoon peaked at 98 degrees in Philadelphia - tying a record for the date from 2002 – and most other sections in the Mid-Atlantic region experienced high heat and humidity. Today will also be a day of high heat and humidity, but big-time relief is coming by Friday and it’s not out of the question that jackets may be required as we close out the work week (and begin the new month of August). A slow-moving cold frontal system will approach the area later tonight from the north and west, but then only be able to inch its way through the Mid-Atlantic region from tomorrow into tomorrow night as low pressure forms along its boundary zone.
Showers and thunderstorms are likely to be somewhat limited in coverage later today and tonight and then they should become more numerous and widespread on Thursday afternoon and night. Some of the rain will be heavy at times during the PM hours on Thursday, some of the storms can be strong-to-severe, and localized flash flooding is on the table. Showers may linger on Friday – the first day of August - and the day will feature a stiff east-to-northeast wind with low pressure pulling away from the east coast. Clearing skies will set in late Friday night and the first weekend of August may turn out to be the nicest weekend of the entire summer season with comfortable temperatures and low humidity levels.
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Today will be another very hot and humid day with plenty of sunshine during the morning hours and then increasing clouds later in the afternoon. The late day clouds will be in advance of a slow-moving cold frontal system which can result in isolated showers and thunderstorms through the evening hours. More numerous showers and thunderstorms are likely on Thursday in what will be a big-time transition day for the Mid-Atlantic region from the high heat and humidity of the first half of the week to much cooler conditions by week’s end.
As the cold front slowly grinds its way through the area, low pressure will form along the boundary zone and increase the chances for some heavy rainfall on Thursday and Thursday night and localized flash flooding is a possibility. Showers can linger on Friday - the first day of August - and the day will be much cooler with well below-normal temperatures and a stiff E-NE wind. Clearing skies should develop later Friday night and the first weekend of August should turn out to be one of the nicest of the entire summer season with very comfortable temperatures and low humidity values.
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Today should be another rain-free day in the region with plenty of sunshine, but continued very hot and humid conditions and afternoon highs well up in the 90’s. A slow-moving cold frontal system will approach the region at mid-week and it can result in some scattered late day and/or nighttime shower and thunderstorm activity. Widespread showers and thunderstorms are likely on Thursday in what will be a transition day for the Mid-Atlantic region as the cold front slowly grinds its way through the area…there is the potential for heavy rainfall and flash flooding. Showers can linger on Friday - the first day of August - and the day will be noticeably cooler with well below-normal temperatures. An east-to-northeast breeze will be quite noticeable as well with low pressure pushing slowly away from the east coast. Clearing skies arrive on Friday night and the weekend should turn out to be one of the nicest of the entire summer season with very comfortable temperatures and low humidity values.
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High heat and humidity will persist in the Mid-Atlantic region through mid-week with high temperatures well up in the 90’s each afternoon, but there is significant relief in sight and the transition from here-to-there may feature some heavy rainfall and possible flash flooding conditions. A slow moving cold frontal system will approach the area late Wednesday and then only be able to slowly grind its way through on Thursday as low pressure forms along the frontal boundary zone. Showers and thunderstorms are likely to be scattered late Wednesday and Wednesday night and then they should become widespread on Thursday. Some of the rain can be heavy at times on Thursday with flash flooding conditions possible as part of the transition from the current high heat to the comfortable air mass coming at the end of week. The arrival of much cooler air on Friday will coincide with the calendar flip from July to August and the first several days of the new month look quite comfortable from the Midwest to the Mid-Atlantic. Showers may linger on Friday morning and the day will feature a stiff E-NE breeze with low pressure pulling slowly away from the east coast. Clearing skies will set in on Friday night and the first weekend of August may just turn out to be the nicest weekend of the entire summer season with comfortable temperatures and low humidity levels.
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A weak frontal system passed through the region last night and the next few days will be hot and humid with afternoon high temperatures well up in the 90’s on Tuesday and Wednesday. It should be rain-free both today and tomorrow, but then a slow-moving cold frontal system will approach the region at mid-week and it could produce late day or evening showers and thunderstorms on Wednesday. Rain is more likely to fall on Thursday in what will be a transition day for the Mid-Atlantic region as the cold front grinds its way through the area and there is the potential for some heavy rainfall. The passage of the cold front by Friday will usher in very comfortable air to close out the work week and begin the month of August, and the weekend could turn out to be the nicest of all summer with a continuation of comfortable conditions.
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Temperatures will climb into the 90’s today ahead of an approaching cold frontal system that’ll then stall in close proximity this weekend. The threat of showers and thunderstorms will increase later in the day, continue this evening, and some of the storms can be strong. With the front hanging nearby this weekend, it’ll be somewhat unsettled with additional showers and thunderstorms possible; especially, during the day on Sunday. It stays very warm and humid during the first half of next week, but a pattern change late next week could bring us a pleasant end to July and start to August.
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Heat and humidity will increase today in the Mid-Atlantic region and temperatures should reach well into the 90’s on Friday along the I-95 corridor. It stays very warm and humid this weekend and through the first half of next week. In terms of prospects for rain, an approaching frontal system late tomorrow will increase the chance of showers and thunderstorms; especially, on the NW side of I-95. This front stalls out this weekend nearby and the result will be the threat of showers and thunderstorms from time-to-time.
Looking ahead, the pattern changes noticeably by later next week across the northeastern states with an upper-level trough of low pressure intensifying over southeastern Canada. Comfortable air is likely to drop south and east from Canada into the Northeast US and Mid-Atlantic region late next week and the first several days of August might be rather pleasant. It is at this time that conditions might change in the tropical Atlantic Ocean which can lead to a ramp up in activity by the middle of the new month and a teleconnection index (MJO) supports this notion.
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Heat and humidity will begin to climb today in the Mid-Atlantic region and temperatures will soar on Friday with afternoon highs likely in the middle 90’s. A cold front approaches the area by tomorrow night and then stalls out in close proximity this weekend. This slow-moving frontal system will bring us the chance of showers and thunderstorms late tomorrow and some of the storms can be strong…weekend looks somewhat unsettled as well.
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