Record heat continues with mostly sunny skies near Boston, storm chance north
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Diverging Reports Breakdown
Heat wave to peak with all-time high records in play for the Boston area
Temperatures will soar 20 to 25 degrees above the 30-year average high temperature on Tuesday. The heat index reached 114 degrees in Brookfiled, 110 at Westfield-Barnes Airport near Springfield, and 105 in Norwood. In Boston, the record high for June 24 is 95 degrees, set in 2013. Tuesday will be mostly clear until a front brings scattered showers and thunderstorms late. There may be a rogue severe storm up north that can bring a brief heavy downpour and gusty winds. The south shore may end up a touch cooler, ending up in the low 90s and heat index values in the mid-to-high 90s. The air will feel muggy and uncomfortable, almost tropical, almost like we’re living in the desert Southwest. It will be partly to mostly clear at night, with lows in the upper 70s and mid-90s under mostly sunny skies in the southeastern Mass.: Hot and muggy with loads of humidity, with highs reaching triple digits.
With dew points well into the 70s, some areas in southern New England broke 100 degrees on the heat index. The heat index reached 114 degrees in Brookfiled, 110 at Westfield-Barnes Airport near Springfield, and 105 in Norwood. Even Natick reached a heat index of 113.
A slight sea breeze kept Logan Airport just short of 90 degrees Monday afternoon, while temperatures soared into the 90s just a mile or two inland, a blast of heat that will continue for a third day on Tuesday.
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New England will soar 20 to 25 degrees above the 30-year average high temperature on Tuesday. Tropical Tidbits
A quick look at Tuesday
Extremely hot with loads of humidity, with highs reaching triple digits and heat index values nearing 110 degrees in Greater Boston, and much of southern New England.
Heat alerts are all over the place, so please make sure you’re careful. Listen to your body and take breaks if spending time outdoors. Heat exhaustion or stroke can happen in minutes on Tuesday.
Heat alerts extend across much of New England through Tuesday evening. Boston Globe
A few clouds will begin to build in the afternoon as a weak cold front makes its way into the region from the northwest. This front arrives in Boston too late in the evening to have any impact on the hot weather, but a few showers and thunderstorms may pop up across northern New England to cool things down a touch. There may be a rogue severe storm up north that can bring a brief heavy downpour and gusty winds.
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The setup — extreme heat and humidity reaching dangerous levels
It’s like we’re living in the desert Southwest. The dome of high pressure reaches peak intensity on Tuesday, paired with the extremely high sun angle, setting up what could be a record day for high temperatures across parts of New England.
Take a look at expected highs across the region. Temperatures when you head out the door on Tuesday morning will already be in the 80s.
Highs on Tuesday will reach the 100s across Southern New England, including Boston. Boston Globe
A strong westerly breeze could keep the sea breeze away on Tuesday, allowing heat to stretch to the coast. Boston Globe
There’s not much expected in terms of precipitation on Tuesday afternoon and evening, but a dry, cold front will push into Northern New England and bring some relief, along with pop-up showers and thunderstorms.
Any storms should die out before reaching Massachusetts, and certainly Boston, keeping Tuesday hot and muggy from sunup to sundown.
Tuesday will be mostly clear until a front brings scattered showers and thunderstorms late. Boston Globe
Dew points are high, driving ‘feels-like’ temperatures into the 100s
The dew points will be driving heat index values into the triple digits with plenty of moisture in the air, keeping the solar radiation from the sun locked in place near the surface. The air will feel muggy and uncomfortable, almost tropical.
Dew points will push into the upper 60s and low 70s on Tuesday. Boston Globe
Take a look at the heat index values forecast for the region Tuesday afternoon.
A look at near or peak heat index values Tuesday afternoon, with most of the region reaching triple-digits. Boston Globe
Heat index values will soar into the triple digits across most of Southern New England on Tuesday. Boston Globe
Weekend sneak peek
We saw the Saturday rain streak come to an end with a stunner of a day this past Saturday. But Sunday morning brought rain to Boston, extending the streak of measurable rain during the weekend in Boston to 15 straight weeks, a record.
This weekend also looks to be active as this high-pressure ridge breaks down and introduces a chance of a storm on Saturday. It’s early, but indicators show at least the chance for scattered showers.
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Tuesday’s breakdown
Greater Boston: Intense heat. Westerly breeze pushes back the sea breeze. Highs to low 100s under mostly sunny skies. Dew points make the heat index 105 to 110 degrees. Staying partly to mostly clear at night with lows in the upper 70s.
Southeastern Mass.: Hot under sunny skies. Temperatures pushing into the upper 90s, some local highs of 100 degrees. The south shore may end up a touch cooler, ending up in the low 90s. South of Route 44 may also stay closer to 90 degrees. Heat index values are in the mid- and upper 90s with high humidity. Mostly clear at night with lows in the low 70s.
Central/Western Mass.: Feeling hot, hot, hot. Highs range from the low 90s in the Berkshires with triple digits possible from Worcester to Springfield under mostly sunny skies. Heat index values to the mid-100s are possible. Partly cloudy at night with lows in the mid-70s.
Cape and Islands: A hot day is in store but escaping the intense heat. A breeze of about 10 miles per hour will help keep highs near 80 across the beaches, but closer to the bridges, it could creep up to 90. Humidity makes it feel warmer regardless. Partly cloudy skies at night with lows in the low 70s.
Rhode Island: Providence and areas north, you’re in for triple-digit highs with heat index values close to 105. Closer to the coast, highs will stall in the upper 80s and low 90s with feels-like temps to the mid and upper 90s. Partly cloudy at night with lows in the 70s.
New Hampshire: Sunny start with increasing clouds. Highs in the low to mid-90s with heat index values closer to 100. A few afternoon showers and thunderstorms pop up, mainly north of Concord. Partly cloudy at night with lows in the low 70s.
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Vermont/Maine: Feeling hot with highs in the mid-90s across both states. High humidity will make it feel closer to the upper 90s. Spotty showers and thunderstorms in the afternoon with an isolated chance for a severe storm packing gusty winds. Lows to the low and mid-70s under partly cloudy skies.
The forecast across Boston for the next seven days. Boston Globe
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Ken Mahan can be reached at ken.mahan@globe.com. Follow him on Instagram @kenmahantheweatherman.