Forecast discussion: We received some showers and light rain in Boston if you happened to be up before 5 a.m. A warm front pushing through Southern New England helped to create that precipitation. Logan Airport received 0.14 inches of rainfall in just 4 hours. As we move into the evening, the high dewpoint temperatures will make it quite uncomfortable for sleeping without a fan or air conditioning. Also, there is the chance for more showers and thunderstorms to develop during the overnight.
Any showers or thunderstorms will come to an end when we wake up Sunday morning. There will be a brief lull during the daytime hours, as some sunshine will return. This will help raise temperatures, and we could see our first 90 degree day of the summer season. However, all that heat and humidity may help create some strong or even severe thunderstorms by the early evening. These thunderstorms will persist into the overnight, with lightning and some small hail possible. Also, strong wind gusts are possible due to downdrafts coming down to the ground from these thunderstorms.
By Monday morning, the frontal boundary will pass to our east, and high pressure ridging will build over the Northeast U.S. The American model continues to keep us wet into Monday, while the European model moves the cold front faster. At this time, it seems the American model has been very inconsistent with the speed of the front. So, I will go with the European model’s forecast, giving us dry but still very warm conditions on Monday. This high pressure ridging will remain over the eastern U.S., while an upper level trough slowly digs south and over the Northeast U.S. This will help slowly lower our temperatures through the week, making it more comfortable. Daytime highs will remain in the lower to middle 80’s after Tuesday, with lows in the middle 60’s.
72 hour forecast:
Tonight: Mostly cloudy skies with isolated showers/thunderstorms possible. Patchy fog will develop as the humidity rises. We will see a low of 72.
Sunday: Isolated showers end by 8 a.m. Partly sunny skies expected, becoming hot, and staying humid. We may see isolated showers and thunderstorms by 5 p.m. We will see a high of 92 with south-southwest winds of 11-15 mph. Heat indexes may reach the upper 90’s.
Sunday night: Showers, rain, and possible strong to severe thunderstorms expected. Lightning and small hail may be within strong thunderstorms. Thunderstorms may also create some downdraft winds. Some thunderstorm cells could create bow echoes, meaning a tornado may form. We will see a low of 73 with southwest winds of 8-11 mph, and gusts to 40 mph in thunderstorms.
Monday: Showers/thunderstorms end by 8 a.m. with mostly sunny skies. We will see a high of 90.
Monday night: Partly cloudy with a low of 69.
Tuesday: Mostly sunny with a high of 85.
Tuesday night: Partly to mostly cloudy skies and a low of 69.
Wednesday: Mostly sunny. Highs 83-86, lows 64-67.
Thursday: Partly to mostly sunny. Highs 80-83, lows 63-66.
Friday: Partly sunny. Highs 81-84, lows 64-67.
Saturday: Mostly sunny. Highs 80-83, lows 63-66.