Miguel Pierre

Thursday Overview: Cooler and drier air arrives

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After a cold front passed through with some showers and thunderstorms on Wednesday evening, another cooler and drier airmass has settled into the area. Temperatures are in the 50s and lower  60s over the region early this morning. High pressure will provide beautiful weather, with mostly sunny skies today. Temperatures will only reach the lower or middle 70s this afternoon over the region. Which is big refreshing, difference from yesterday 90 degree heat. These temperatures are also slightly below normal for mid-September.

Mostly clear skies and calm winds, will lead to more radiational cooling tonight. Temperatures may get down to 50s and some 40s over much of the region. Closer to New York City, low temperatures may be closer to 60. You may want to wear a light jacket or sweater headed to work or school tomorrow morning. Friday and Friday night will be similar to today and tonight, with high pressure remaining in control. Some other highlights over next several days.

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John Homenuk

Synopsis: Autumn air in the Northeast US late week

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A powerful cold front and thermal gradient, associated with a northern stream atmospheric disturbance, will move toward the area later this week. Along with some showers and storms, the front will bring a much cooler and drier airmass, with origins in Canada, allowing temperatures to fall fairly dramatically on Thursday and Friday. This will come in stark contrast to the overall warm and moist regime which our area has been settled in for quite some time now.

The front will move through later Wednesday, without too much fanfare. Lingering through Wednesday night, a few showers and storms will be possible, but overall limited atmospheric instability will preclude any threat for organized thunderstorms or hazardous weather. Instead, the main story will be a wind shift and temperature drop, as very cool air aloft rapidly shifts into the region and winds turn west-northwesterly.

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Doug Simonian

Premium Weekly Outlook: Unseasonable warmth bookended by tastes of fall

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Another relatively calm and dry week looks to be in-store, as we’ll start off with a taste of fall, moderate to unseasonably warm temperatures, and then again experience a taste of fall. A cold front that moved through on Saturday night has completely cleared the area, giving way to a broad area of high pressure across the region. This has helped dropped humidity substantially, bringing us very comfortable temperatures — we started in the 50s in many locations —  as well as a lovely crisp morning. This high pressure will be in-control for today, with light winds, mostly sunny skies, and temperatures rising into the upper 70s to around 80. The weak wind flow may allow for some seabreezes to develop, but without a big difference in temperature between the land and ocean, these seabreezes should not be too strong, nor penetrate too far inland.

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John Homenuk

Long Range: Autumn cold blasts, southeast ridge

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Meteorological Autumn technically began 9 days ago now. Although Hermine took much of the focus off its start and placed it on tropical weather, the first 9 days of the meteorological season have offered an ironically similar pattern to what had been observed over the last month or so of summer. Warmer temperatures have dominated in the East — especially the Mid Atlantic. Much of this owes to a Southeastern US ridge, which has built back continually over the past 2 months, even when forecast models have suggested otherwise.

Meanwhile, back west, cold fronts and disturbances have continued to drop southward through the Northern Great Plains and into parts of the Great Lakes and Mississippi and Ohio Valleys. By and large, however, the colder than normal temperature anomalies associated with these disturbances have remained west of the Mississippi River. Airmass modification has essentially nullified any below normal temperature anomalies as they move east of there.

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