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dave epstein

Boston area has seen its wettest fall on record. More rain is coming

Umbrellas have been necessary in Boston a lot recently, and that may continue.
Umbrellas have been necessary in Boston a lot recently, and that may continue. (Jonathan Wiggs/Globe staff/file)

The latest round of rain overnight and into Sunday morning has now ended, but there’s another batch of it on the way.

The next rain storm is actually part of the same system, and it’s going to bring a major snowstorm to the middle part of the country. This storm will track to the west of New England and therefore we will see its milder effects.

If your travel plans call for you the be in the Midwest on Monday, be aware of the latest forecasts. There will be some travel delays especially overnight and into Monday morning.

A foot or more of snow could fall through Monday in some parts of the midwest.
A foot or more of snow could fall through Monday in some parts of the midwest. (WeatherBell)

But for us here in New England, the rain continues. We just had four days without rain, and for many this was the first time we’ve had a stretch this dry since September. You have to go back to the first five days of September to find a stretch of five days without a trace of rain.

Monday morning will be dry and so you don’t have to worry about commuting into work on wet roads. However, in the afternoon, the rain will return, and many areas could see another half to an inch.

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The rain will end early Tuesday, but this will be the ninth Tuesday of twelve with some rain. This will also put Boston well over 8 inches of rain for this month. But it’s not the most rain Boston has seen in November — that was back in 1876 when 11.03 inches fell.

Wettest fall ever

The Blue Hill records go back to the late 1800s, the oldest in the country. After today’s rain, they will record 2018 as the wettest meteorological fall ever for the Boston area. This is the period between Sept. 1 and Nov. 30.

Why so wet?

The reason for all the rain is that the jet stream has continued in an active pattern since the early part of September. The jet stream is the catalyst and conveyor belt for most types of low pressure areas in this part of the country. When it’s crossing our regions, we often see storms. You’ll remember the humidity we had this summer and into the fall. As the jet stream underwent a new configuration, it’s set up such that we’ve had multiple storms moving through the region. I don’t see a break in this pattern for the foreseeable future, meaning we’re going to see more wet weather.

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The jet stream is forecast to spawn a new storm early in December.
The jet stream is forecast to spawn a new storm early in December.(Tropical Tidbits)

There will be another storm during the first week of December. What type of precipitation we see will depend on how much cold air gets involved with the systems and how they track. Although temperatures look to be below average over the next week, there are some signs that we may see a lack of cold air in the country during the first part of December.

The bottom line with all this precipitation is that forecasters are going to be kept on their toes in the coming weeks, and we will certainly have to pay attention to large rivers and streams for flooding if this continues through spring.