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April 15 16 Obs Thread


wxeyeNH
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Central MA, North Worcester:  Had just over 3" here at 7:15 am.  I shook off some bushes at that time and they are already bending again with new snowfall.  My footprints from then are half filled in, so thinking close to 5" total now.  Really heavy stuff though--it's compacting a lot.  Main roads are melting, but side streets were snow covered this am.

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this event probably does 20% give or take better snow stack and intensity performance, with better lower atmospheric gradients.  The whole system probably bombs and UVM is deeper in the atmosphere ..intersecting grown regions and all that jazz, a bit more proficiency. 

33 F S- in Ayer.  ~ 1/2"  as of 9:15.  At dawn there was no snow otg and none falling - although I didn't scrutinize for 'cat paw' content.  Reports seem to suggest it was over to snow and snowing prodigiously just west of here prior to the dawn, but that was pretty well handled.. 226' elevation here at town hall, which is pretty damn low this far inland so we are definitely in a valley. The snow ( presently ) is uniform small to mid size wet snow aggregates, ...when this first commenced here roughly 8:15 ...we had a 1/2 hr of half fist size cotton swabs -

It's interesting that last evening between 8 and 10 we did have cat paw and sleet pinging mixed with the rain beginning around 40 F.  By 11 ..back to plain rain, but down to 38.  It's almost like this system did a typical winter storm sequence, but aloft .... and rained down into a relatively warm boundary layer.   If this were a winter lower thickness, we might have had snow to mix to rain at the front side of WAA ... the precipitation sequence last night seem to suggest that was doing that typology, but above the melt level. Then, secondary takes over and dynamics mixing in traced CAA, and all to snow now. 

I don't 'think' anyone gets 10" lower than 1,200 elevation .. but the 06z NAM seemed to boost QPF and has this rotting in the area through late afternoon... so we'll see who/where max pixel. The other aspect is that given daylight in August 24th equiv insolation, we may not stack everything that falls..  There's a distinction between how much is snowing has fallen, and how much is on the ground at any moment -

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5 minutes ago, STILL N OF PIKE said:

Most models including our trusted euro  ended up having the 925mb way  too far WNW or NW. Its further SE and Over ACK as of 13z

https://www.spc.noaa.gov/exper/mesoanalysis/new/viewsector.php?sector=16&parm=pmsl&underlay=1&source=1#

850 Low is over ACK as well. Look out

HRRR did awesome here

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