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Boston weather: The heat and humidity return on Tuesday

At 5 p.m. EST, the second tropical depression in the Atlantic formed.
At 5 p.m. EST, the second tropical depression in the Atlantic formed.
www.wunderground.com/blog/JeffMasters/comment.html?entrynum=2733

Forecast discussion: High pressure over western New York brought Boston nice weather, although high temperatures were a bit below normal for July. Temperatures were only in the middle to upper 70’s. Thanks to the southeast winds, Boston Harbor is already seeing dense fog. However, as we move through the next 48 hours, our winds will turn to the southwest. This will allow for more moisture from the south to move over New England. This will make our humidity levels increase, and become more oppressive by Wednesday.

For Tuesday, I am expecting temperatures to reach the middle 80’s. I am expecting dewpoint temperatures to reach the upper 60’s by early Wednesday morning. We may see some dense fog along the shoreline. As we move into Wednesday, a cold front now making its way into Minnesota will bring the risk for some showers and thunderstorms. We will begin to see some precipitation early Thursday morning. There may be times when we see some heavy periods of rain.

Looking over the computer models, it appears the precipitation will come to an end just before midnight Thursday night. We will see partial clearing entering early Friday morning. Also, our humidity will drop, as winds come from the northeast. High pressure will then give us nice weather to begin the weekend. However, cooler air will keep our high temperatures below normal.

So far, we have had seven straight weekends without any precipitation. Saturday looks like we will make it number eight. However, the computer models feel we may see some evening showers on Sunday. A slow moving low pressure system over the Ohio River Valley will keep showers, rain, and embedded thunderstorms over us entering next Monday.

Meanwhile, the Atlantic is starting to get busy. As of 5 p.m. EST, the National Hurricane Center issued its first advisory on Tropical Depression Two. It is about 1200 miles east of the Lesser Antilles. However, the low will not be in an area where there will be a good environment for development. At this time, the forecast calls for the system to be a remnant low within 5 days.

72 hour forecast:

Tonight: Clear to partly cloudy skies with a low of 64.
Tuesday: Mostly sunny and more humid with a high of 86. Winds will come from the south-southwest at 10-13 mph.
Tuesday night: Partly cloudy and humid with a low of 71. Winds will come from the southwest at 10-13 mph.
Wednesday: Partly sunny, hot and humid. We will see a high of 88.
Wednesday night: Scattered showers and thunderstorms after midnight with a low of 70.
Thursday: Scattered showers and thunderstorms with a high of 77.
Thursday night: Precipitation ends by 11 p.m. with partial clearing and a low of 63.

Extended Forecast:
Friday: Mostly sunny. Highs 76-79, lows 63-66.
Saturday: Mostly sunny. Highs 80-83, lows 64-67.
Sunday: Partly to mostly sunny. Highs 79-82, lows 63-66.
Monday: Cloudy with scattered showers/thunderstorms. Highs 76-79, lows 64-67.