Today was indeed exquisite with fresh dry air, a deep blue sky and a pleasant breeze for most outside activities like apple picking, golfing, walking, running, biking, hiking, etc. but not swimming. The ocean and lakes have cooled off quite a bit from the max temperatures back in late August. There were hundreds and hundreds of board surfers in wet suits enjoying the 4-6 foot rollers slamming onto New England beaches. It was very picturesque as the brisk offshore wind produced blow off spray from the sharp-cresting breakers. Air temperatures maxed out in the range of 68-74. With a decreasing wind and very dry air, it will cool down to the lower to middle 40s in many of the suburbs to the lower 50s around Boston under a mainly clear sky. By daybreak, some mid and high level cloudiness could be streaming into the region as a potent disturbance aloft arrives. Its attendant pool of cold air will result in an unstable environment so expect the sky to become at least 50% covered by puffy clouds which might release virga or shower streaks descending from the clouds most of which will dry up on the way to the ground. It will be cooler with less wind than today with highs generally 64-68.
Looking ahead, it will be a typical first week of fall with milder air streaming in for Tuesday and Wednesday with highs of 70-75. It will be a cold start Tuesday morning in the 40s but Wednesday morning will be milder as a cold frontal boundary shifts southeastward into the region from southern Canada. A stream of some moisture ahead of the front may be sufficient to trigger scattered showers anytime Wednesday especially in the afternoon and evening. The boundary will move offshore Thursday morning as a sprawling high pressure system builds across southern Canada. The forecast becomes uncertain over the upcoming weekend because latest guidance is not giving a green signal that the high pressure will settle over New England to protect the area with sunshine, cold nights and pleasantly cool days. Instead, an evolving upper air trough of low pressure may create developing low pressure on the Mid-Atlantic coastline. It is presently unclear if the northern fringe of rain will penetrate into southern New England. Currently, I am leaning in the direction that most of the wet weather will be steered out to sea near or just south of Cape Cod on Saturday. A more important storm emerging from the Ohio Valley could soak the area at the beginning of October. It is too premature to be confident about next weekend at this time.
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Melissa Mack returns from vacation and delivers her AccuWeather Forecast in the morning and Todd Gutner will follow later in the day. I’ll be providing midday forecasting coverage on WBZ NewsRadio 1030 tomorrow and Tuesday.