sussexcountyobs Posted February 13, 2019 Share Posted February 13, 2019 22 minutes ago, wdrag said: Ditto on fine snow here in Wantage. 2.4 at 720P and 20.8F. the snow means that that there is possibly only a shallow saturated layer of rh with lift in the -8C range causing the fine snow. Just measured 2 1/4" here. Was wondering why it was snowing here when everybody else is going the opposite direction. My question to you is, what is rh? Link to comment Share on other sites More sharing options...
etudiant Posted February 13, 2019 Share Posted February 13, 2019 NYC Central Park was around 1.5", with graupel all afternoon. Overall, a winter event of little note, but driving was really nasty. 1 Link to comment Share on other sites More sharing options...
gravitylover Posted February 13, 2019 Share Posted February 13, 2019 I've got freezing mist and rain now, temp is 25*! Uggh Link to comment Share on other sites More sharing options...
hudsonvalley21 Posted February 13, 2019 Share Posted February 13, 2019 24/23 here with a light mixture of IP and ZR Link to comment Share on other sites More sharing options...
Rtd208 Posted February 13, 2019 Share Posted February 13, 2019 Picked up around 2.0" of snow/sleet, 0.30" of rain for the day. Current temp 34 w/light rain. Link to comment Share on other sites More sharing options...
wdrag Posted February 13, 2019 Author Share Posted February 13, 2019 8 hours ago, sussexcountyobs said: Just measured 2 1/4" here. Was wondering why it was snowing here when everybody else is going the opposite direction. My question to you is, what is rh? sorry for the delay. RH is relative humidity. Models are generally very good at forecasting deep layered high humidity precipitation, but are not so good with precip at layers of high humidity below ~3000 feet (example when a dry slot cleans out the high humidity above 3000 feet). In yesterdays case, With still very high humidity trapped below the inversion, and probably a temperature of nearly -8C somewhere in that layer, and just a bit of lift (with the secondary developing near the coast-there was convergence here), fine snow may have been produced because snow generally needs to be generated with ice nuclei in a saturated layer of ~ -8C or colder. Also, as a side bar...when precip is changed to rain by a warm layer aloft, it can refreeze to ice pellets (sleet), with a temperature of -6C below that above freezing layer, or to ice pellets by a deep layer of sub0C below the above freezing layer. Anyway, hopefully the first part of your message is answered and my reasoning is possibly not the only answer. Link to comment Share on other sites More sharing options...
wdrag Posted February 13, 2019 Author Share Posted February 13, 2019 Wantage NJ - 8 S of High Point. Final 2.5". glaze on top. Still 28.4F at 4A. Thanks for joining this thread w your obs. Walt Link to comment Share on other sites More sharing options...
sussexcountyobs Posted February 13, 2019 Share Posted February 13, 2019 Thanks for the explanation wdrag. 1 Link to comment Share on other sites More sharing options...
IrishRob17 Posted February 13, 2019 Share Posted February 13, 2019 3.5” snow and sleet, .10 ice final Link to comment Share on other sites More sharing options...
NorthShoreWx Posted February 13, 2019 Share Posted February 13, 2019 1.7" max depth of snow and sleet. Most of it is still there this morning. Total precip 0.77" Snow/sleet - 0.37" Rain - 0.40" The snow sleet SWE could be a little low. That's just what collected in the can melted before the phase shift. 4" can isn't the best way to collect snow. So half the precip was frozen and half was liquid. Plenty of it left this morning, plows still moving it around, and the peanut gallery is quiet. 1 1 Link to comment Share on other sites More sharing options...
LibertyBell Posted February 13, 2019 Share Posted February 13, 2019 13 hours ago, Snow88 said: Any measurements for the NYC area ? 1.2 at NYC 0.8 I think at the airports? 1 Link to comment Share on other sites More sharing options...
LibertyBell Posted February 13, 2019 Share Posted February 13, 2019 14 minutes ago, NorthShoreWx said: 1.7" max depth of snow and sleet. Most of it is still there this morning. Total precip 0.77" Snow/sleet - 0.37" Rain - 0.40" The snow sleet SWE could be a little low. That's just what collected in the can melted before the phase shift. 4" can isn't the best way to collect snow. So half the precip was frozen and half was liquid. Plenty of it left this morning, plows still moving it around, and the peanut gallery is quiet. sleet has staying power! this was like a lesser version of the VD 2007 event Link to comment Share on other sites More sharing options...
wdrag Posted February 13, 2019 Author Share Posted February 13, 2019 My last: Thanks for those added obs the past two days. Here's the remainder of 0.1 estimated radial glaze this morning at 9A (melting). 1 Link to comment Share on other sites More sharing options...
rgwp96 Posted February 13, 2019 Share Posted February 13, 2019 14 hours ago, JerseyWx said: Funny thing is, I measured on it and got 2 inches as well. Now it's freezing rain. Glaze on everything. Sidewalks were terrible this am and side roads . Temps peaked at midnight at 33 than slowly dropped to a low of 30.8 at 430. What’s odd was the most ice I saw on trees was looking towards riverdale (also butler heights area behind hs )and Bloomingdale . Hills to my west and north are higher in elevation (kinnelon and west Milford) had no signs of ice in trees . I have a decent view of both areas from my street 1 Link to comment Share on other sites More sharing options...
MJO812 Posted February 13, 2019 Share Posted February 13, 2019 39 minutes ago, LibertyBell said: 1.2 at NYC 0.8 I think at the airports? Only 0.8? That seems low Link to comment Share on other sites More sharing options...
rgwp96 Posted February 13, 2019 Share Posted February 13, 2019 5 hours ago, wdrag said: sorry for the delay. RH is relative humidity. Models are generally very good at forecasting deep layered high humidity precipitation, but are not so good with precip at layers of high humidity below ~3000 feet (example when a dry slot cleans out the high humidity above 3000 feet). In yesterdays case, With still very high humidity trapped below the inversion, and probably a temperature of nearly -8C somewhere in that layer, and just a bit of lift (with the secondary developing near the coast-there was convergence here), fine snow may have been produced because snow generally needs to be generated with ice nuclei in a saturated layer of ~ -8C or colder. Also, as a side bar...when precip is changed to rain by a warm layer aloft, it can refreeze to ice pellets (sleet), with a temperature of -6C below that above freezing layer, or to ice pellets by a deep layer of sub0C below the above freezing layer. Anyway, hopefully the first part of your message is answered and my reasoning is possibly not the only answer. Walt a Met here a few years ago here kind of explained the same thing saying the fine snow must have formed right below the warm layer . I’m in butler and had that fine snow as well most of the day . They were needle shaped when I examined them on my glove. 1 Link to comment Share on other sites More sharing options...
JerseyWx Posted February 13, 2019 Share Posted February 13, 2019 21 minutes ago, rgwp96 said: Sidewalks were terrible this am and side roads . Temps peaked at midnight at 33 than slowly dropped to a low of 30.8 at 430. What’s odd was the most ice I saw on trees was looking towards riverdale (also butler heights area behind hs )and Bloomingdale . Hills to my west and north are higher in elevation (kinnelon and west Milford) had no signs of ice in trees . I have a decent view of both areas from my street Yeah the freezing rain came in last night and put a hard shell over everything. I can actually see the heights from where I am across town. Link to comment Share on other sites More sharing options...
gravitylover Posted February 13, 2019 Share Posted February 13, 2019 So this morning around 10 when I finally went out it was 2" compacted snow topped with 1" of sleet and .2-.3" clear ice over everything. Areas that were shoveled or blown yesterday after the sleet was mostly over were solid ice but also melted off quickly. There's a fair bit of melting on asphalt but not on anything else, this stuff is locked up solid even though it's 37* out there. At least the ice has pretty much fallen out of the trees now because it was windy for a while this morning. The roads aren't bad but they're narrow. Link to comment Share on other sites More sharing options...
NorthShoreWx Posted February 13, 2019 Share Posted February 13, 2019 3 hours ago, rgwp96 said: Walt a Met here a few years ago here kind of explained the same thing saying the fine snow must have formed right below the warm layer . I’m in butler and had that fine snow as well most of the day . They were needle shaped when I examined them on my glove. We had the same fine snow here as well right up until everything changed to rain around 6pm. I've seen it in just about every sleet event we've ever had. It probably happens during snowstorms too, but you wouldn't notice it then. 1 1 Link to comment Share on other sites More sharing options...
CPcantmeasuresnow Posted February 13, 2019 Share Posted February 13, 2019 4 hours ago, LibertyBell said: 1.2 at NYC 0.8 I think at the airports? 3 hours ago, Snow88 said: Only 0.8? That seems low Actually all 6 reporting stations were between 1.2 and 2.0. Central Park was low on the totem pole this time, a throw back to the zookeepers measurements of winters past. The park 1.2 LGA 1.5, JFK 1.2 EWR 1.9 Bridgeport 1.3 and Islip 2.0 1 1 Link to comment Share on other sites More sharing options...
IrishRob17 Posted February 14, 2019 Share Posted February 14, 2019 23 hours ago, IrishRob17 said: 3.5” snow and sleet, .10 ice final Melted down to .87 Link to comment Share on other sites More sharing options...
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