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Hot & Humid On Tuesday: After a cool and wet holiday weekend, the heat and humidity will return in vengeance on Tuesday. A southwesterly wind flow around a high pressure ridge will lead to afternoon high temperatures of 90 to 95 Degrees across all of Western and Central Mass. In addition to the heat, it will be quite humid with heat index numbers of near 100 Degrees expected from late morning through the afternoon hours. One thing that may make it feel a little more tolerable are the gusty southwest winds which will gust up to 30 to 35 mph at times. Severe Thunderstorms Very Likely Between 3 pm & 8 pm Tuesday: A bigger concern on Tuesday will be the threat for strong to severe thunderstorms between about 3 pm and 8 pm Tuesday. A piece of atmospheric energy is expected to push into this hot, humid and very unstable air mass during Tuesday afternoon. Strong to severe thunderstorms are expected to develop across the entire area beginning around 3 pm or so on Tuesday and then continue through the late afternoon and evening hours before coming to an end around 8 pm or so Tuesday. Strong wind gusts of up to 60 to 70 mph is likely to be the main threat with any severe storms. In addition, given the very humid air mass that will be in place, extremely heavy rainfall with localized street flooding will also be a threat. Finally, there are some signals in the data that suggest the possibility for a rotating severe storm or two that could produce large hail or even a tornado or two. I will be monitoring the weather very closely on Tuesday and will have additional updates as needed.

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Very hot and humid weather is expected to continue throughout this afternoon with temperatures reaching the middle 90s and heat index numbers of up to 105 Degrees. Strong to severe thunderstorms are currently occurring over parts of Maine, New Hampshire and Vermont. These storms are expected to push southeastward over the next few hours and reach Western and Central Mass by very late this afternoon. These thunderstorms will bump into a very hot, very humid and very unstable air mass and thus these storms are likely to remain strong to severe as they push through during the very late afternoon and evening hours of today. It looks like strong to severe thunderstorms will push southeastward across Western and Central Mass beginning around 4 to 5 pm or so this afternoon and then continue well into this evening. I expect that these storms will move out of our area close to midnight tonight. The main threat from any severe thunderstorms will be strong wind gusts of up to 55 to 70 mph. In addition, given the very humid air, extremely heavy rainfall with the potential for localized flash flooding will also be a threat. Finally, frequent lightning is expected with most of the thunderstorms late this afternoon and this evening. I am monitoring the weather extremely closely and will have additional updates as needed.

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Wednesday afternoon and Wednesday evening could be quite active across all of Western and Central Mass with strong to severe thunderstorms very likely. Before then though, Tonight is expected to be a very warm and very humid night with low temperatures near 75 Degrees expected. Any thunderstorms that are occurring right now should be done by about sunset. Another very hot and humid day is expected on Wednesday with high temperatures of around 95 Degrees expected. The thunderstorm potential is expected to increase dramatically as a piece of atmospheric energy pushes into New England from the Great Lakes region. The amount of unstable air is expected to be very high and there is expected to be high enough shear available leading to the possibility of a couple of rotating thunderstorms. At this point, it appears that strong to severe thunderstorms will push east-southeastward across Western and Central Mass beginning around 3 to 4 pm or so Wednesday afternoon and continuing into the evening hours of Wednesday. These storms are expected to push out of the area by about 8 to 9 pm or so. The main threat from any severe thunderstorms will be strong wind gusts of up to 55 to 70 mph. In addition, given the very humid air, extremely heavy rainfall with the potential for localized flash flooding will also be a threat. Finally, frequent lightning is expected with most of the thunderstorms on Wednesday afternoon and evening. I will be monitoring Wednesday’s severe weather situation very closely and will have updates as needed.

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