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Everything posted by NorthShoreWx
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Biggest Pre-winter snowfalls at Central Park: 16.0" December 19-20, 1948 15.2" December 11 - 12, 1960 14.0" December 5 - 7, 2003 12.7" December 15, 1916 10.5" December 16 - 17, 2020 10.0" November 26-27, 1898 Makes the top 5 in the past 150 years. Sounds really substantial when you put it that way.
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December 16-17, 2020 Storm Observations and Nowcast
NorthShoreWx replied to wdrag's topic in New York City Metro
This might be best part of the storm here. Borderline blizzard conditions.- 1,011 replies
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December 16-17, 2020 Storm Observations and Nowcast
NorthShoreWx replied to wdrag's topic in New York City Metro
Not a total porking. We went over to sleet around midnight with the temp around 31 and had light accumulatons of sleet. Didn't go above freezing until sometime beteween 3 and 4 and got a little rain during that time, but barely enough to start to "darken" the thin layer of sleet that had accumulated on previously cleared surfaces. Temp peaked at 34.3 at 4:12 and had dropped back to 29 by 4:45. The snow since then is crappy flakes, but the lowest visibilities of the entire event. Basically nothing melted and we are approaching 6" with ongiong snowfall.- 1,011 replies
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December 16-17, 2020 Storm Observations and Nowcast
NorthShoreWx replied to wdrag's topic in New York City Metro
When the guidance on measuring snow changed several years ago (and for the life of me I can't find when it happened, but I remember that it did indeed happen), the instructions included that the board would no longer be wiped at a phase change. I've never agreed with that. As a hypothetical example: 1. In a 20 hour period 3" sleet falls with 1.00" liquid followed by 6" snow with 0.5" liquid. Total precip =1.50" Daily Snow measured = 9" 2. Same scenario but the snow falls first and gets beaten into unconsciousness by the sleet. (assuming for this exercise that the snow and sleet depth at end was 6") Total precip = 1.50" Daily Snow measured = 6" The exact same precip fell in both storms and its all still lying on the ground, but a casual observer would easily conclude that the event where 9" was measured was bigger than the 6" event. You can make inferences based on the liquid equivalent, but in the end you are losing information about the amount of snow and sleet that fell. In many ways snow depth and SWE are more important metrics, but snowfall is a different statistic and is what most of us are more interested in That being said, there were a lot of phase changes tonight.- 1,011 replies
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December 16-17, 2020 Storm Observations and Nowcast
NorthShoreWx replied to wdrag's topic in New York City Metro
Sleet here for the first time. temp still 31. 4.9" (11:45)- 1,011 replies
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December 16-17, 2020 Storm Observations and Nowcast
NorthShoreWx replied to wdrag's topic in New York City Metro
Light to moderate snow continues. The wind has increased over the past hour and there is considerable blowing snow. No pingers that I could detect so far. Was very light snow during that last lull. Had 4.3" as of 9:30. I doubt we've hit 5" yet. Temp up to 31 (11:26PM)- 1,011 replies
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December 16-17, 2020 Storm Observations and Nowcast
NorthShoreWx replied to wdrag's topic in New York City Metro
It's 40ish right on the beaches down that way but low to mid 30s a few miles inland.- 1,011 replies
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December 16-17, 2020 Storm Observations and Nowcast
NorthShoreWx replied to wdrag's topic in New York City Metro
Any reports of OES in Monmouth County? https://weather.cod.edu/satrad/nexrad/?parms=DIX-N0Q-1-24-100- 1,011 replies
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Got it. The actual NAM model soundings at h51 were all comfortably below freezing at all levels above the immediate surface (where they were 32 or 33).. Not sure how that map is calculated since the model soundings should drive what's drawn on the map and there is no way to derive sleet or zr from the sounding..
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Wasn't inferring it was an analog. Not sure there are many analogs for this one (as modeled) , but there are certainly examples where both areas got hit hard.
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March 2001 The discussion that started it all: http://www.northshorewx.com/HPC20010302.html And the ultra-modern 2001 hi-tech graphics:
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Precisely. NAM soundings IMBY show snow through hour 54. Then light sleet with a little drizzle for an hour or so after that and back to all snow for the duration. The mixed precip occurs with the dryslot.
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Soundings look comfortably all snow over NYC on 0Z/h51 Nam. What are you looking at? Edit Soundings indicate a brief mix with IP around hour 53, then all snow again afterwards. Maybe an hour of mix, but not at hour 51.
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I think we're on the same page. White Plains is farther inland than Huntington which is farther inland than Babylon. LIS shouldn't be treated as just another lake, but it can't hold a candle to the ocean.
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I've been doing the max depth thing, although I will wipe a board once a day in the AM , even during a continuing storm. That's the number I provide in spotter reports. I double it for posting here. To be fair that doc leaves open the possiblity for 6 hour wipes (i.e., at airports), so the issue remains confusing, I'm not sure if it is the latest and greatest however.
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Relatively common. A good way to think of it is the south shore folks are on the beach and the north shore folks are 10 or 15 miles inland. The LI Sound isn't insignificant, but it's a much smaller body of water and after October also colder. In 2015, a significant portion of the Sound froze over. if anything, it adds more snow than it detracts.
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You missed a good one. 14" total here including about 6" in 2 hours. Ended as some freezing drizzle on the north shore while it was plain rain in OC. Some of those guys were a combo of disbelief and less than happy with the topsy turvy outcome.
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December 2020 General Discussions & Observations Thread
NorthShoreWx replied to bluewave's topic in New York City Metro
There was definitely that potential, but we had a slow meltout right through the first days of March. -
December 2020 General Discussions & Observations Thread
NorthShoreWx replied to bluewave's topic in New York City Metro
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December 5-6, 2020 Storm Observations and Nowcast
NorthShoreWx replied to Baroclinic Zone's topic in New England
That's in the eye -
Oops, wrong season. But do loop that radar over the past 3 or 4 hours.
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Well, there's an SE wind at ACK, the latest ERC is almost complete and it looks like the center is gonna go right up Buzzards Bay Cool feature on the radar: https://weather.cod.edu/satrad/nexrad/index.php?parms=OKX-N0Q-1-48-100-usa-rad
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12" here March 2001
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Def band over central LI modeled on the NAM around noon has my attention. Not holding my breath but it'll be worth a look out the window.
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