Uncommon May nor'easter to bring rain, snow to New England states just
before Memorial Day weekend
[May 22, 2025]
By ISABELLA O'MALLEY and PATRICK WHITTLE
SCARBOROUGH, Maine (AP) — An unusual May nor'easter is set to wallop New
England on Thursday, providing a soaking before the Memorial Day holiday
weekend with weather more commonly associated with fall and winter.
Nor'easters usually arrive in the end of fall and winter and bring high
winds, rough seas and precipitation in the form of rain or snow. This
week's nor'easter could bring wind gusts over 40 mph (64 kph) and up to
2 inches (5 centimeters) of rain in some areas. Snow is even possible at
high elevations.
The storm has New Englanders preparing for a messy couple of days during
a time of year usually reserved for sunshine and cookouts.
What is a nor’easter?
A nor'easter is an East Coast storm that is so named because winds over
the coastal area are typically from the northeast, according to the
National Weather Service. The storms can happen at any time of the year,
but they are at their most frequent and strongest between September and
April, according to the service.
The storms have caused billions of dollars in damage in the past. They
usually reach the height of their strength in New England and eastern
Canada. The storms often disrupt traffic and power grids and can cause
severe damage to homes and businesses.
“We have a stronger jet stream, which is helping intensify a low
pressure system that just happens to be coming up the coast. And so
that’s how it got the nor’easter name,” said Kyle Pederson, a
meteorologist at the National Weather Service in Boston.
Who will see rain and snow
The heaviest rain is likely to fall in Rhode Island and southern and
eastern Massachusetts, Pederson said. Localized nuisance flooding and
difficult driving conditions are possible Thursday, and catastrophic
flooding is not expected.
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Snow weighs down trees in Concord, N.H., April 4, 2024. (AP
Photo/Kathy McCormack, file)
The storm is then expected to pass, leaving light rain and patchy
drizzle, on Friday.
“It's just really a nice dose of rain for the region — not expecting
much for flooding,” Pederson said.
Snow is expected to be confined to mountainous areas, but
accumulations there are possible.
Why nor’easters are rare in May
Nor’easters are usually winter weather events, and it is unusual to
see them in May. They typically form when there are large
temperature differences from west to east during winter when there
is cold air over land and the oceans are relatively warm.
But right now there is a traffic jam in the atmosphere because of an
area of high pressure in the Canadian Arctic that is allowing
unusually cold air to funnel down over the Northeast. The low
pressure system off the East Coast is being fueled by a jet stream
that is unusually south at the moment.
“It really is a kind of a winter-type setup that you rarely see this
late,” said Judah Cohen, seasonal forecast director at the private
firm Atmospheric and Environmental Research.
If this type of pattern in the atmosphere happened two months
earlier, he said, “we’d be talking about a crippling snowstorm in
the Northeastern U.S., not just a wet start to Memorial Day
weekend.”
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O'Malley reported from Philadelphia.
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