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Boston weather: Hot and humid today, showers and storms late

A quiet looking map Tuesday night will turn more active Wednesday as an approaching cold front triggers showers and storms late Wednesday into Wednesday night.
A quiet looking map Tuesday night will turn more active Wednesday as an approaching cold front triggers showers and storms late Wednesday into Wednesday night.

Tuesday marked a return to warmer temperatures and a gradual increase in humidity as the day wore on. You could feel the heavier air during the morning hours that became more of a stuffy feeling by evening. Temperatures climbed well into the 80s across the area with a few communities reaching 90 degrees.

After a warm and increasingly humid night we are set up for a hot and humid day on Wednesday. With the morning lows hovering around 70 degrees the mercury will have no problem climbing well into the 80s with some areas reaching the low 90s this afternoon. A cold front approaches from the west with the hot and humid air moving over the area on gusty southwest winds ahead of the front. As the front closes in on the area clouds increase during the afternoon with a chance of showers and thunderstorms breaking out late in the afternoon, especially through the interior.

Showers and thunderstorms are expected Wednesday evening and lasting through the first half of the night, then tapering to showers after midnight with still a chance of an isolated thunderstorm. Through the evening and early night hours there is a chance of a strong to severe storm that could produce tropical downpours and gusty winds. The wind threat should diminish thereafter but the chance for a burst of heavy rain will remain overnight. Another muggy night with low temperatures in the upper 60s. Winds turn northwest to north overnight and diminish.

The front will be slow to move across eastern Massachusetts Wednesday night and may not actually move off the coast until very early on Thursday morning. Meanwhile, low pressure rides along the front and this will keep it mainly cloudy with morning showers, becoming more spotty in the afternoon. It turns dramatically cooler Thursday, highs only in the low 70s, as winds turn northeast. It is possible that temperatures remain steady in the upper 60s along the coast, making for quite a cool day for late July.

Thursday night will be much more agreeable for sleeping without the air conditioner as the humidity levels will also have fallen dramatically. The lows fall into the mid and upper 50s inland to low 60s along the coast. Skies stay mostly cloudy.

High pressure builds in from the Midwest during Friday and brings a pleasant day with comfortable temperatures, sunshine and low humidity. Highs in the mid to upper 70s along the coastal plain, low 80s inland.

Fair skies and pleasant temperatures Friday night. Lows in the upper 50s to low 60s once again.

On Saturday there will be a stalled frontal boundary to our south and another front to our north. The proverbial squeeze play will be on with unsettled conditions south and north of the area but we should stay dry and mild. Probably a partly cloudy day on average, highs reminiscent of Friday’s temperature.

By Sunday the clouds take over and there is a chance for showers by late in the day. You will also notice the humidity levels starting to increase again as we close out the weekend.

North Shore beach outlook:

Wednesday: Warm and humid. Partly sunny in the morning and early afternoon, increasing clouds thereafter. Chance of a shower or thunderstorm, especially north of Cape Ann, late in the day. High temperatures in the mid 80s. Gusty southwest winds to 25 mph. UV Index high. Water temperatures in the mid to upper 60s. Moderate chance of rip currents with a 2 to 4 foot surf. High tide just before 10 am, low tide near 4 pm.

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