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Eastern Mass Gets Their Swag Back - SWFE on Steriods - Region wide Major Snowfall - Jan 25-26, 2026 Nowcast/Obs.

Sey-Mour Snow

By Sey-Mour Snow,
in New England

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MJO812
MJO812

Greetings from weenieville

Damage In Tolland
Damage In Tolland
CT Rain
CT Rain

17.0" here

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wxsniss

wxsniss

Posted
Posted
6 hours ago, weathafella said:

I would like to see BOS eclipse 20.  Shouldn’t be too hard with 18.6 at 7AM.  I don’t care about my own total which is probably close to Logan’s and I’ll measure after I get my morning activity done.  

Was thinking the same. I think we have a real shot at 20" total looking at radar, and from soundings at 0z we could get better snowgrowth than we had all day yesterday...

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wxsniss

wxsniss

Posted
Posted

Sorry not fresh, but wanted to add to thread for legacy / archival purposes... I thought this was a nice bit from the Box AFD last night detailing the storm.

I'm still not sure why snowgrowth wasn't as good as many (including this AFD) expected... but with Cocorahs having generally 1.4-1.7 qpf / snow totals 15-20" (@Ginx snewx's call all week) with areas 20"+ in the expected north shore and Worcester hills... seems like SLRs ~10-12:1? Still achieved 1-1.5" / hr rates for almost entire duration. 

KEY MESSAGE 1...Major winter storm continues this evening and
overnight. Difficult to impossible travel conditions persist through
12-2am with 1-3" per hour snowfall rates.

After a bit of an early start, snowfall rates have increased to 1
inch per hour across much of the CWA this afternoon. These dangerous
travel conditions continue well into the overnight as low pressure
deepens offshore helping to increase mid level frontogenesis. The
bulk of the snow falls through about 06z with gradual improvement
into Monday morning as a dry slot works its way into the region.
Storm totals are still holding steady as of the 18z update with
totals expected to be in the 12"-18" range across the majority of
southern New England, with 8"-12" expected on the Cape, Islands, and
immediate southern coast. The higher elevations and northeastern MA
will likely see 18"-24" for much of the 495 corridor including the
Boston metro area.

Coastal low takes shape off the Del Marva Peninsula this afternoon
helping to further increase mid-level frontogenesis. In response, a
deep and robust layer of lift will extend through much of the column
including the dendritic growth zone (DGZ). BUFKIT soundings even
show the potential for 2 favorable layers for dendritic growth, one
in the mid to upper levels, and another closer to the surface with
the deep and substantial near surface cold pool. Attention turns
from mid level frontogenesis to lower level frontogenesis (925-
850mb) as a steep low level temperature gradient associated with an
incoming coastal front approaches from the south. Coastal front
initially races north across the ocean then slows to a crawl this
evening as it encounters the wedge of low level cold air on land.
Warm front aloft still continues north overnight, so expecting +SN
to slowly transition to heavy sleet along the south coast and move
inland between 00-05z Furthest inland extent looks to be along west
to east corridor extending from Providence RI to Plymouth MA. In
these locations the mid level warm nose increases to +1-2C. Perhaps
a bit more exciting for us weather lovers is the non-zero
chance for +TSSN as the mid levels warm enough for some elevated
instability this evening into the overnight. Northeasterly LLJ
increases to 30-40kts this evening as the low center passes just
S of Nantucket. Thus, could see a period of gusty winds and
blowing snow especially over the southern waters, Cape and
Islands. HREF blizzard probs remain around 20%-30%, between 22
and 05z. The limiting factors for blizzard conditions along the
south coast will be sleet and lower snow ratios as well as the
short lived nature of the gustiest winds.

Further inland, the  mid level warm front stops short of changing
the precip type to sleet and instead brings a lower ratio snow that
that will help to cap totals between 12 and 18 inches for much of
the interior. Impressive temperature gradient develops overnight
with surface temps rising to near 32 as far inland as PVD but
staying in the lower teens at ORH on the other side of the surface
warm front!

Prolific snow winds down from SW to NE as a mid level dry slot
pushes into southern New England as 500-700mb RH values fall to 40-
60%. RH values like these are hostile to snow crystal growth and
instead favor a period of "snizzle" or flurries. Any lingering snow
eventually tapers to light flurries. Last hold out for light to
moderate snow will be northeastern Massachusetts as northeasterly
flow on Monday will allow for ocean-driven snow showers to persist
into Monday afternoon. The next key message will better focus on
Monday`s snowfall.
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jculligan

jculligan

Posted
Posted

Best snow growth of the entire event right now. We've picked up an additional 1.7" since noon today, which brings the storm total to 18.0 inches. We'll see if we can still pull off 20" before all is said and done.

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