Heaviest rainfall slowly moving east

The end of the rain isn’t that far away. Already we are seeing flood watches dropped for the central and western part of the area as a cold front slowly marches eastward. The morning heavy downpours continue, but they are inching their way out to see. I actually expect the evening to be much better with only a few leftover showers.

The image below shows the flow of the rain as of late morning. While the position of the rain showers will change by the time you read this, you can get an idea of how the elements of rain are moving this morning.

loop late am.gif

The air is very saturated. The amount of water in the air means any rain showers we have will potentially come with torrential downpours. These showers might be heavy enough to create street flooding and even cause some roads to become temporarily impassible.


The reason for all the rain today continues to be a strong flow of air from the south and a slow moving cold front to our west. Eventually, this frontal system will pass off the coast and then the rain will finally shut down.

The atmosphere is a bit different today than yesterday. While we certainly could and will see thunderstorms today, I don’t expect the severity of Tuesday to be repeated. With one to three inches of rain being forecast streams and small rivers could rise to bank full in a short period of time. Rainfall rates might reach 3 inches in one hour in some of the showers today. You might have to pull over if you are driving. The most likely areas of potential flooding will be over eastern and southeastern Massachusetts. West of Route 495, there isn’t a risk for flooding any longer.


The front will push off the coast overnight and bring an end to the rainfall. Thursday brings back the sunshine and lowers the humidity. The next stretch of dry weather should continue into the weekend and with seasonable temperatures this will be an ideal weekend for all mid-summer outdoor activities.

I don’t much in the way of noticeable humidity starting tomorrow and continuing into the weekend. Next week some clouds and the chance of showers will resume, but I am not expecting a return of the pattern of the past few days with the oppressive humidity.
Longer range shows some heat building in the center of the country, but presently I don’t see any prolonged 90 degree weather returning to southern New England.


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