I hope your Father’s Day was as wonderful as mine. To have my daughter and sons home for the day is all I really wanted- but I did receive a great CD, some tools and those new trekking poles will be used on our hike to “Isolation” on Tuesday. Overall, the weather was splendid today with areas of clouds and sunshine. Most places that were socked in with clouds yesterday had sunshine today and vice versa. It was fantastic for outside activities but still too cool along the coast. That is all going to change in a very big way following a nippy night ahead. Many of the cooler suburbs will sport temperatures in the middle to upper 40s as low cloudiness over the ocean expands westward over Cape Cod early this evening and later tonight across much of the rest of the region. Lock up the cool air in your home tonight in prep for the transformation to sweltering conditions at midweek!

The low cloudiness will be scoured out to reveal a decent supply of sunshine many areas and patches of clouds in other places tomorrow. The temperatures will be about 3-5 degrees higher than today in most locations. The blocking action over the Atlantic will break down as an upper level low pressure circulation lifts northeastward and allows high pressure over the Northeast to settle southward. Its upper level counterpart will actually strengthen and the clockwise flow around the surface pressure system will capture the hot air in the middle of the nation and propel it into the Northeast. The warmup commences Tuesday with highs in the lower 80s except lower 70s at south-facing coastal areas. After that, the core of the hot air mass will surge over the region later Wednesday and Thursday. Lower 90s are likely on Wednesday as, appropriately, summer starts at 7:09pm to be followed by many new record high temperatures on Thursday. For instance, I am predicting Boston’s 1949 record of 95 degrees on Thursday, June 21 to be eclipsed by 1 or 2 degrees. The only cooler locations will be on Cape Cod with highs in the upper 70s to middle 80s. There will be hot land breezes at east-facing beaches. In addition to the heat, the humidity will become high with dewpoints rising to 65-70 degrees. This is a high confidence forecast so get your air conditioning and fans ready. It will be quite a shock after the below average temperatures of this month.

Presently, it appears the hot weather will be booted out of here as the ridge collapses and the jet stream reconfigures and delivers cooler air out of Canada again next week. Between the heat and the cool-down, there is a risk of a potent short wave digging in to produce a developing storm near the region next Sunday. It is too premature to be sure of specifics but the stage may be set for some healthy showers and storms on Sunday with backlash rains and gusty winds Sunday night into Monday. Once the storm exits, cooler and drier air will rush in from Canada.

Melissa Mack delivers her AccuWeather Forecast in the morning and Todd Gutner follows later in the day.

Make it a great week!