alex Posted February 13, 2019 Share Posted February 13, 2019 30 minutes ago, powderfreak said: Your area will be interesting. All models show severe downsloping NW of the Whites with like 50kt gusts. It's snowing nicely but it's like a blizzard because of the wind. It just blows everywhere. I'm not a fan of wind lol Link to comment Share on other sites More sharing options...
Ginx snewx Posted February 13, 2019 Share Posted February 13, 2019 3 minutes ago, dendrite said: The cold layer below the melting layer is cold enough to produce its own small snow crystals. The problem is, there isn’t enough lift in that level to really get any decent snow growth. So you end up with sleet and snow grains. A human observer would code it -PLSG. ASOS is automated so it usually just gets called -SN. I really only see -SG from MWN. You will like this Mike Solomonoides took this in Farmington, Dendrite examples and sleet 1 Link to comment Share on other sites More sharing options...
ORH_wxman Posted February 13, 2019 Share Posted February 13, 2019 3 minutes ago, wxsniss said: Agree I think 2 other variables that meh-ed this event, even with H75 advance and timing of sleet changeover as it was: 1) the poor snow growth: it was baking soda just about the entire event... the lift was always significantly displaced from the DGZ... decent dendrites for the past 6 hours and we'd have a different tune in here 2) the initial thump was actually kind of meager: guidance last night was hinting at a more robust thump, ~0.5+ qpf for parts of SNE before a changeover... and then it kind of back off today. It came in like a wall but then was pretty meager the middle 3-4 hours. I made a post last night going over typical parameters we want to see for solid warning amounts in a transition SWFE. You want a classic "cross hair" sig on the soundings...that's just a quick way of saying the omega lines up with the snow growth zone...and you typically want big omega too. Not just some 15 micro bars per second maxima. We didn't have a cross hair sig in this event so that is why it is good to stick to advisory amounts. 12/16/07 had a big cross hair sig despite it being a SWFE it had this bullseye at like 550-600mb where the snow growth temps were. Point two, which you mentioned, is a good one too. You want a big thump of rates on liquid equivalent. Seemed to start off that way today but then died off after the first 90 min or so. So even with crappy snowgrowth, we could have maybe tickled 5-6" if the rates stayed high...but it's usually good to see at least a tenth per hour of LE on the model guidance. Link to comment Share on other sites More sharing options...
dendrite Posted February 13, 2019 Share Posted February 13, 2019 Just now, Ginx snewx said: You will like this Mike Solomonoides took this in Farmington, Dendrite examples and sleet Nice. A few small dendrites in there and plenty of needles. I see some regular plates and sectored plates too. Link to comment Share on other sites More sharing options...
MarkO Posted February 13, 2019 Share Posted February 13, 2019 Very interesting here right now. Sleet mixed in with snow about 45 min ago, since then it appears there is better lift in the DGZ and we now have partial melting of dendrites refreezing. Still mostly accumulating snow. Link to comment Share on other sites More sharing options...
wxeyeNH Posted February 13, 2019 Share Posted February 13, 2019 13.4F SN- 2" Fair snow growth. Very light winds Link to comment Share on other sites More sharing options...
CoastalWx Posted February 13, 2019 Share Posted February 13, 2019 Will make low end of range which is all I care about lol. Link to comment Share on other sites More sharing options...
CoastalWx Posted February 13, 2019 Share Posted February 13, 2019 Essex county getting heavy snow. Link to comment Share on other sites More sharing options...
Sugarloaf1989 Posted February 13, 2019 Share Posted February 13, 2019 Moderate sleet and pixie dust, 23F. Link to comment Share on other sites More sharing options...
HoarfrostHubb Posted February 13, 2019 Share Posted February 13, 2019 Decent sleet here in N ORH county. Looks like our snow ended st around 3.5” and is being beaten down by the sleet. 18.9F Link to comment Share on other sites More sharing options...
CoastalWx Posted February 13, 2019 Share Posted February 13, 2019 6 minutes ago, ORH_wxman said: I made a post last night going over typical parameters we want to see for solid warning amounts in a transition SWFE. You want a classic "cross hair" sig on the soundings...that's just a quick way of saying the omega lines up with the snow growth zone...and you typically want big omega too. Not just some 15 micro bars per second maxima. We didn't have a cross hair sig in this event so that is why it is good to stick to advisory amounts. 12/16/07 had a big cross hair sig despite it being a SWFE it had this bullseye at like 550-600mb where the snow growth temps were. Point two, which you mentioned, is a good one too. You want a big thump of rates on liquid equivalent. Seemed to start off that way today but then died off after the first 90 min or so. So even with crappy snowgrowth, we could have maybe tickled 5-6" if the rates stayed high...but it's usually good to see at least a tenth per hour of LE on the model guidance. Cross hair sig wasn’t an option but I thought we good get a good thumpnof decent flakes which is what we had for two hours. That kind of fizzled as LLJ wasn’t ramped up yet I guess. Link to comment Share on other sites More sharing options...
MarkO Posted February 13, 2019 Share Posted February 13, 2019 Oddly it's back to snow (little sleet if any) and low level pixie. 22.3/21 Link to comment Share on other sites More sharing options...
CoastalWx Posted February 13, 2019 Share Posted February 13, 2019 And here comes the other SWFE climo. The dryslot of showery precip. 1 Link to comment Share on other sites More sharing options...
Tom12309 Posted February 13, 2019 Share Posted February 13, 2019 17 minutes ago, dendrite said: The cold layer below the melting layer is cold enough to produce its own small snow crystals. The problem is, there isn’t enough lift in that level to really get any decent snow growth. So you end up with sleet and snow grains. A human observer would code it -PLSG. ASOS is automated so it usually just gets called -SN. I really only see -SG from MWN. That's why this site is so awesome and I don't throw that word around. You see a phenomenon you don't understand and somebody's gonna know why it is so. Link to comment Share on other sites More sharing options...
PowderBeard Posted February 13, 2019 Share Posted February 13, 2019 19 minutes ago, wxsniss said: 1) the poor snow growth: it was baking soda just about the entire event... the lift was always significantly displaced from the DGZ... decent dendrites for the past 6 hours and we'd have a different tune in here Awful snow growth. There was a 5-10 minute span prior to mixing I saw some actual flakes. Link to comment Share on other sites More sharing options...
codfishsnowman Posted February 13, 2019 Share Posted February 13, 2019 46 minutes ago, Lava Rock said: U bet we do Sent from my Pixel 2 using Tapatalk you guys could have 5 years in a row like this or better up there and deserve every inch....it is supposed to snow up north Link to comment Share on other sites More sharing options...
alex Posted February 13, 2019 Share Posted February 13, 2019 9 minutes ago, wxeyeNH said: 13.4F SN- 2" Fair snow growth. Very light winds Really??? How is it that it's a tornado up here and you have light wind? Make the wind go away lol Link to comment Share on other sites More sharing options...
Lava Rock Posted February 13, 2019 Share Posted February 13, 2019 you guys could have 5 years in a row like this or better up there and deserve every inch....it is supposed to snow up northHa. I thought u were being facetiousSent from my Pixel 2 using Tapatalk Link to comment Share on other sites More sharing options...
40/70 Benchmark Posted February 13, 2019 Share Posted February 13, 2019 3" S+ 22.1/20.5 Link to comment Share on other sites More sharing options...
dendrite Posted February 13, 2019 Share Posted February 13, 2019 2 minutes ago, alex said: Really??? How is it that it's a tornado up here and you have light wind? Make the wind go away lol Upslope on NW flow...downslope on SE. Link to comment Share on other sites More sharing options...
geo1 Posted February 13, 2019 Share Posted February 13, 2019 10 minutes ago, MarkO said: Oddly it's back to snow (little sleet if any) and low level pixie. 22.3/21 Same here and actually picked up at least another inch maybe up to 4. Link to comment Share on other sites More sharing options...
40/70 Benchmark Posted February 13, 2019 Share Posted February 13, 2019 11 minutes ago, MarkO said: Oddly it's back to snow (little sleet if any) and low level pixie. 22.3/21 No sleet here yet...good growth now. Really improved while I shoveled. Link to comment Share on other sites More sharing options...
backedgeapproaching Posted February 13, 2019 Share Posted February 13, 2019 5 minutes ago, alex said: Really??? How is it that it's a tornado up here and you have light wind? Make the wind go away lol Like PF said, those downsloping winds pretty well modeled in your area and western slopes of greens. Its howling here with mod IP and still little snow mixing in. Link to comment Share on other sites More sharing options...
powderfreak Posted February 13, 2019 Share Posted February 13, 2019 4 minutes ago, alex said: Really??? How is it that it's a tornado up here and you have light wind? Make the wind go away lol Dead calm here on the eastern side of the Spine with air filled thick with flakes.... while a Wind Advisory is in effect on the west side for gusts to 50mph. Calm on the upslope (the low level jet is rising to get over the mountains), strong winds mixing down on the downslope. Which is why we get high winds in Stowe on NW flow. Edit: Not sure why that graphic is so small, ha. Link to comment Share on other sites More sharing options...
DomNH Posted February 13, 2019 Share Posted February 13, 2019 Was out 20 minutes ago shoveling to avoid a complete mess tomorrow morning..great growth before the switch flipped. Link to comment Share on other sites More sharing options...
codfishsnowman Posted February 13, 2019 Share Posted February 13, 2019 5 minutes ago, Lava Rock said: Ha. I thought u were being facetious Sent from my Pixel 2 using Tapatalk not at all, I cant imagine what it was like watching the eastern sne snowbowl up there...I did just ok down here and it drove me nuts watching them score 15 to 30 inch events like it was just another storm lol that is why I am blown away by all the complaining from some of those folks Link to comment Share on other sites More sharing options...
powderfreak Posted February 13, 2019 Share Posted February 13, 2019 1 minute ago, 40/70 Benchmark said: No sleet here yet...good growth now. Really improved while I shoveled. Must mean the warmth is nearby. I love how that happens. You get the mid-level warmth to cause the smaller flakes to aggregate into bigger flakes as they get slightly wet aloft. There's probably some spring blue bomb going on at like H7-H8 at 32.1F. Link to comment Share on other sites More sharing options...
40/70 Benchmark Posted February 13, 2019 Share Posted February 13, 2019 2 minutes ago, powderfreak said: Must mean the warmth is nearby. I love how that happens. You get the mid-level warmth to cause the smaller flakes to aggregate into bigger flakes as they get slightly wet aloft. There's probably some spring blue bomb going on at like H7-H8 at 32.1F. I though that, too...but its snowing in Wilmington and Lowell, so... Link to comment Share on other sites More sharing options...
powderfreak Posted February 13, 2019 Share Posted February 13, 2019 36 minutes ago, wxsniss said: 1) the poor snow growth: it was baking soda just about the entire event... the lift was always significantly displaced from the DGZ... decent dendrites for the past 6 hours and we'd have a different tune in here This got me thinking how rare it is to get great snow growth in these types of events. The mid-level warmth is also what's causing the best lift, so naturally as that level warms we lose snow growth. I mean you don't even have to look at soundings in these events to know its going to be baking soda or thousands of needles. Given the size of the flakes up here it wouldn't surprise me if this came in under 10:1 even for part of this. It's like a fog and air is thick with snow, but they are the smallest flakes you can get. Link to comment Share on other sites More sharing options...
MarkO Posted February 13, 2019 Share Posted February 13, 2019 sleet and pixie dust now. You can see what happened on radar. I envision what PF said, seems to explain things. Link to comment Share on other sites More sharing options...
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