Forecast discussion: Boston, and the rest of Southern New England, has been waiting for one of those hot, hazy, and humid days of summer. Although much of inland Massachusetts reached 90 degree or more temperatures, Boston’s Logan Airport only reached 88 degrees. But, if you add the humidity, the heat index made it feel like the lower 90’s. The hottest temperature I could find seems to be near Brookline, MA, which had a temperature of 97 degrees as of 4 p.m.
So, how long will this heat and humidity last? Well, the heat is going to remain, but we will see a drop in the humidity by Friday. As we move into Thursday, a cold front passing through the Great Lakes and down into the Mississippi River Valley will pass through New England Thursday night. Ahead of the front, we will see scattered showers and thunderstorms. Some thunderstorms might be strong, and create small hail, strong winds, and lightning. A particular cell passed through Narragansett, RI yesterday evening. The activity will end by Friday morning, with bright sunshine expected by the afternoon. Temperatures will remain in the upper 80’s, and it is possible we could reach 90 degrees.
We will enter the weekend with weak high pressure ridging giving us a mix of clouds and sun by Saturday afternoon, but a weak cold front passing through the Northeast U.S. could bring precipitation during the evening. The front will pass offshore by Sunday morning, and we will return to bright sunshine to end the weekend. A new cold front could bring more precipitation by Monday night, and end by Tuesday. However, the European model keeps us much drier, with the front passing through without as much moisture. For now, I will keep the risk of precipitation in the forecast, but I am losing confidence in the American model’s forecast scenario.
After Friday, we may have lost some of the humidity, but the heat will remain. Temperatures through the extended period will have daytime highs in the middle to upper 80’s, with lows in the upper 60’s to lower 70’s.
72 hour forecast:
Tonight: Partly cloudy until 2 a.m. with increasing clouds. We will see a low of 75.
Thursday: Partial sunshine changes to overcast skies with scattered showers/thunderstorms starting by 4 p.m. We will see a high of 89 with south-southwest winds of 13-16 mph. Some thunderstorms may be strong, with small hail, lightning, and gusty winds.
Fenway Park Forecast (7:10 p.m. vs. White Sox): Passing shower/thunderstorm, 83.
Thursday night: Scattered showers/isolated thunderstorms with a low of 71. Winds will come from the west-southwest at 7-10 mph.
Friday: Isolated showers/thunderstorms until 7 a.m. with late morning sunshine. It will become less humid. We will see a high of 88.
Friday night: Partly cloudy with a low of 69.
Saturday: Mostly sunny through the morning, with increasing clouds during the early afternoon. We will see a high of 88.
Saturday night: Showers/thunderstorms possible after 8 p.m. with a low of 70.
Sunday: Overcast with scattered showers/thunderstorms until 7 a.m. Mostly sunny skies expected by 11 a.m. Highs 85-88, lows 68-71.
Monday: Partly to mostly sunny with increasing clouds through the afternoon. Scattered showers and moderate rain expected by 11 p.m. Highs 85-88, lows 69-72.
Tuesday: Showers/thunderstorms end by 10 a.m. with partly sunny skies. Highs 84-87, lows 67-70.
Wednesday: There is a slight chance for rain/thunderstorms for the south coast during the morning. Otherwise, partly sunny skies expected. Highs 84-87, lows 66-69.