wxsniss

21z HRRR continues 2-3", spot 4" additional in Boston area, especially south shore Best stuff 6-10pm Upstream reports in western MA and CT are promising

19z HRRR bumped up from 18z... another 3-4" in Boston area Maybe a little salvation for all those burned on 2/1

Definitely has helped accums and wintry appeal that we’ve hovered 29-30F... a tick cooler than forecast CF has barely budged all day

I was just about to comment about that... Very pulsatile... fluctuates between nothing to moderate in minutes... on radar, makes me wonder if the cellular OES echoes are the main mechanism for the heavier snow

Amazing to see that efficient accumulation on roads in that photo of Morrissey by 93 Just a few miles away, good rates but we're very slow to accumulate on black asphalt. Accumulating great on unplowed and all other surfaces. Widespread 3"+ with pockets to 6" in eastern SNE when all is said and done. Feels like winter, and not a terrible event relative to how much we've been shafted.

18z HRRR and RAP both put down another 2-3" in same areas it's been snowing all morning, most in same areas it's been snowing all morning For the asphalt accumulation concerns, about half that comes after 5pm

Reaching moderate with some of these echoes... A good prognostic for eastern areas getting another 2-4" between ~1pm-10pm when it's more organized.

Maybe this will help soothe any frustrations... Probably the most incredible thing I've seen this winter:

We've had an amazing stretch, not to mention Feb 2015. Should be an easy tradeoff! But the natural tendency for snow lovers (myself included) is to recalibrate expectations higher, not accept regression to the mean lol

OES cells are brief but great growth... let's hope that maintains this afternoon Re: seasonal impression: Oct, Dec 17, and Superbowl storms were awesome and overachievers for Boston region. Otherwise has been a frustrating winter. BOS metro folks (CoastalWx, Henry's Wx, DotRat, Summerthyme, myself and others) had one of the worst letdowns in recent memory in the 2/1 WAA/firehose... hours of heavy and 1-2F colder would've seen 10"+ like just a few miles inland instead of wet asphalt.

Boston metro had a nice band 4-5am, dropped at least another 0.5” or so

0z RGEM cut back but not terrible... burst of better dynamics from like 3pm-9pm Friday for eastern SNE Looks like another 3-6" ORH east

0z RGEM will be telling... along with GFS, UK, was really robust at 18z.

So cool: look closely between Weymouth and Plymouth... you can see the OES echoes moving inland while the storm echoes move eastward. Probably some under the beam stuff impacting coastal locales further north.

MV was probably seeing 2-3"/hr for a bit today. Personally, I would have loved to see photos and video of 54 dBz rates from an iconic SNE locale that rarely sees that.

Agree... best support for those higher amounts from 18z RGEM, 18z HRRR long range, 18z GFS, and 12z UK... not our most reliable guidance. Stakes are not the highest. We're talking a prolonged 3-6" vs. 4-8" for eastern SNE.

For Boston metro... the irony is we are whitening surfaces more efficiently than the 2/1 storm where we had heavy rates for hours and nothing to show for it.

Counting on enough mechanics with the last pulse Friday...

Wasn't long duration, but would've been an awesome spot for today! Axiom this season: whenever family visits from Philly area, Philly overperforms and Boston region vomits on itself. N=3. Added frustration that they get the impression New England winters are not much different from mid-Atlantic.

that's really impressive

Great post. Some thoughts to add, correct me if I have anything wrong. The fast flow at 250mb could serve as a vent to enhance rather than shear cyclogenesis... Ginx yesterday made an interesting comparison to 2/11/1994 where the jet enhanced rather than sheared mechanics. In contrast, the fast flow and compression at H5/H7 is shearing the WAA component seaward. Other things to look for when thinking about shearing vs. venting in this specific scenario? Too fast? Orientation more west to east rather than northeast?

A definite tick northwest, but still nowhere close to GFS Verbatim a protracted advisory event for most of SNE. The better dynamics still developing too late for eastern SNE and didn't improve much on Euro.

So far sizable tick north on Euro for WAA portion compared to 12z