A frontal boundary zone will move into the area today and this should help to knock off a few degrees for today’s highs compared to Tuesday. There will be the chance of showers and thunderstorms this afternoon, tonight and on Thursday when temperatures will climb back into the middle 90’s. Any storm that forms later today, tonight and on Thursday can be strong-to-severe with heavy downpours, damaging wind gusts on the table. The same frontal system should clear through the region by the end of the week paving the way for a more comfortable Labor Day weekend.
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The next few days will remain on the unsettled side across the Mid-Atlantic region with an occasional shower or thunderstorm. Any storm that forms can be quite strong and produce heavy downpours. The month of September will start quite hot as well as unsettled with 90+ degree highs on the table for this afternoon. Signs continue to point to a cold frontal passage by the end of the week which should result in a more comfortable Labor Day weekend.
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The peripheral region of an intense upper-level ridge can often be quite an active area for thunderstorms this time of year and this summer has been no exception. Specifically, the northeastern quadrant of an intense upper-level ridge where northwesterly flow dominates in the overall clockwise circulation around high pressure can often contain numerous bands of thunderstorms, complexes of thunderstorms and even long-lasting lines known as derechos. This “ring of fire” region in the outer peripheral of high pressure with northwesterly flow aloft has been repeatedly showing up this summer extending from the Great Lakes to the Mid-Atlantic and numerous severe weather outbreaks have been the result. A repeat performance is on the table during the next few days with Tuesday, Wednesday and Thursday likely to feature numerous bands of strong-to-severe thunderstorms that will potentially impact the DC-to-Philly-to-NYC corridor.
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The early and middle parts of the week look unsettled in the DC metro region with the chance of showers and thunderstorms from time-to-time. Temperatures will climb to 90 degrees today and then well up in the 90’s for Tuesday, Wednesday and Thursday along with that continuing chance of daily showers and thunderstorms. Looking ahead, the Labor Day weekend could be more comfortable following the passage of a cold front and high pressure to our north taking control.
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A cold front will cross the region today and push off the eastern seaboard potentially bringing an afternoon shower or thunderstorm to some spots. High pressure builds in for the weekend providing us with warm conditions and plenty of sunshine on both days. It turns hotter and more humid during the early and middle parts of next week after high pressure shifts to the western Atlantic Ocean.
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There will be a warm front pushing through the region today and then a cold front on Friday and the weather will be quite unsettled as a result. There is the chance for showers and thunderstorms at just about anytime today and tonight…some of the storms can be strong-to-severe and some of the rain can be heavy. Another shower or thunderstorm is possible on Friday as the cold front works it way off the eastern seaboard. High pressure then pushes back into the area for the weekend providing warm conditions for both Saturday and Sunday and plenty of sunshine.
One final note, there is a lunar eclipse tonight that peaks at 12:13am (ET) with 96% of the lunar surface covered by Earth’s shadow…weather permitting of course and it looks mostly cloudy.
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High pressure remains in control of the weather for one more day, but then a couple of frontal systems will generate unsettled weather around here from late tonight into Friday. A warm front will approach the area later tonight and early Thursday and then a cold front will arrive on Friday. Showers and thunderstorms can move into the area late tonight and continue off and on during Thursday and a residual shower or thunderstorm is possible on Friday. High pressure pushes back into the area for the weekend providing comfortably warm weather conditions for both Saturday and Sunday.
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High pressure will be in control of the weather across the Mid-Atlantic region for the next couple of days resulting in plenty of sunshine and comfortable conditions for the latter part of August. The weather becomes unsettled on Thursday with the arrival of a warm front and this will increase the chance of showers and thunderstorms. The threat of rain continues on Friday as well as a cold front approaches the area from the northwest. The weekend should begin with more comfortable conditions as high pressure pushes in this direction on the back side of the cool front.
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Labor Day is still two weeks away and that puts this outlook in the “speculation” phase; however, there are interesting and somewhat consistent signs of an “omega” blocking pattern in the upper atmosphere over North America which is more typical of winter or spring seasons. An “omega” blocking pattern typically features an upper-level ridge sandwiched in between two upper-level troughs and these systems tend to linger for several days. If indeed this pattern unfolds with an upper-level trough centered over the Northeast US, then any chance for sustained heat for summer’s unofficial end would be quite low in that part of the nation. However, if the ridge sets up over the Northeast US then 90+ degree heat would certainly remain on the table in those urban areas along the I-95 corridor.
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Following the passage of a cold front, a more comfortable air mass has pushed into the Mid-Atlantic region, but it doesn’t come completely on the dry side. There is a band of showers currently sweeping across northern MD and southern PA which could result in an isolated shower across some of the far northern suburbs of DC early in the day. Temperatures should peak later today in the upper 70’s and climb to the low-to-mid 80’s at mid-week with relatively comfortable humidity levels. The combination of a warm and cold front later this week will bring more unsettled weather back to the Mid-Atlantic.
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