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Boston Weather: 25.0°F | Mostly Cloudy

Weather: Hazy Days of Summer

By Michael J. Ring
STAFF METEOROLOGIST -- While last night’s showers have brought us respite from the sticky heat, another meteorological nemesis may return over the next few days--haze from the Canadian forest fires.

Since being sparked by lightning on July 2, the fires in northern Quebec have burned over 250,000 acres. Soot particles have coated cars in Montreal, while the fires’ smoke plume reached as far south as North Carolina this weekend. The smoke has affected the Maritime Provinces over the past few days.

Why did the smoke come in our direction over the weekend? On Friday and Saturday a low pressure system slid off the Maine coast. In the wake of the low, winds aloft shifted from southerly to northerly and brought the haze our way.

On Monday and Tuesday, winds from the south blocked the smoke from traveling in our direction (but brought us the steamy weather instead). However, with the passage of a cold front last night, winds are again blowing from the north, potentially bringing the smoke back our way. However, with better low-level circulation than the relative stagnation seen this weekend, whatever haze we receive should be more diffuse than Sunday’s smoke.

Extended Forecast

Today: Mostly sunny and much more comfortable. High near 80ºF (27ºC).

Tonight: Partly cloudy. Low near 56ºF (13ºC).

Thursday: Partly cloudy, with the potential of some haze from the Quebec fires. High near 78ºF (26ºC). Low near 58ºF (14ºC).

Friday: Sunny and slightly warmer. High near 83ºF (28ºC) and low near 60ºF (16ºC).

Weekend: Partly cloudy both days, with temperatures similar to Friday’s.