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Relief from humidity and heat will be short

Posted by David Epstein  July 12, 2013 09:30 AM

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During the morning a cold front inched its way past Boston and allowed drier and more comfortable air to make it to the coast. Not everyone is feeling the refreshing air as parts of the south shore and Cape Cod still have dew points in the 60s to near 70. The fact that the front has barely cleared the area is going to be important as we start another weekend. Fronts divide air masses and when you are close to that diving line the weather is often not clear cut. The close proximity of the front is why this morning humid air is so close to the drier air.

I'll be updating the details of the weather on Twitter at @growingwisdom Please follow me there. Feel free to comment or ask questions too.

The dew point, a measure of moisture is a full 10 degrees lower in Boston than it is in Nantucket. I expect the drier air to try to push further south, but not very far. With a northeast wind, temperatures will be much cooler today. I expect the high in Boston to be in the mid-70s this afternoon. Enjoy the coolness.
As for any rain today, I do feel that all areas will stay dry today with the threat of showers out of the forecast. Although we won’t see perfectly sunny skies today, the break in the heat, humidity and showers will be welcome.

Tomorrow a weak storm will develop along the front. This will keep clouds in the forecast. In addition to the lack of sunshine, some areas could see a few showers. The highest risk for rain will be over Cape Cod, but even there the day won’t be a washout.

Sunday, with the front still quite close there will be some clouds, but more in the way of sunshine. As the day progresses you will notice an increase in the humidity as the atmosphere starts to prime itself for heat wave number 3. Temperatures Sunday will reach the 80s.

Heat Returns
Starting Monday and lasting most of next week, the heat will return and you can expect highs to be in the 90-95 degree range inland and in the 80s to near 90F at the coast. Humidity levels will be back in the tropical range and the nights are going to be very uncomfortable for sleeping.

There are early signs that the pattern may break at the end of next week as the jet stream slips south and allows a longer period of less hot weather into the region. That prospect is still a week away and certainly not a sure bet. However, we average 6 days of 90F plus heat in July and after this week I feel we will be at 9 or 10. At some point, averages are going to take hold and break us out of this pattern.

On the outside

All this heat is taking its toll on us as well as plants and animals. I recommend using the cooler weather today and tomorrow to check on your gardens. When it gets back into the 90s, it’s going to be harder to work outside again. A few suggestions would be to stake up perennials, weed, weed, weed, and notice which areas of the garden still might need some added water.

If you want to plant some new seedlings, there is certainly time to do that. The video below shows how I am growing lettuce in containers right now. I have a tray of seedlings I started two weeks ago which can be place in the ground in about a week.

I'll be updating the details of the weather on Twitter at @growingwisdom Please follow me there. Feel free to comment or ask questions too.

This blog is not written or edited by Boston.com or the Boston Globe.
The author is solely responsible for the content.

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About the author

David Epstein has been a professional meteorologist and horticulturalist for three decades. David spent 16 years at WCVB in Boston and currently freelances for WGME in Portland, ME. In 2006, More »
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