April 2 2018 storm 5.5 10 AM total. Will wait on Mike to verify

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Re: April 2 2018 storm 5.5 10 AM total. Will wait on Mike to verify

Post by Sparky Sparticles on Thu Mar 22, 2018 2:40 pm

I saw the same as Dtone. Last night the next door neighbor was out there after 9pm with the snowblower and shovels doing the shared driveway and a few sidewalks and staircases. When I woke up and looked out the windows from my apartment at 4am they all looked like they were freshly shoveled, even though it was still snowing out there, and were just as clean when the snow ended around 7am.
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Re: April 2 2018 storm 5.5 10 AM total. Will wait on Mike to verify

Post by CPcantmeasuresnow on Mon Apr 02, 2018 7:40 am

Here's the problem today as I see it for getting an accurate total from Central Park.

The Conservancy seems to take measurements at 7:00 or 8:00 am and doesn't take another one until 1PM. As soon as the snow lightens up compression and melting will begin and measurements will become inaccurate and low as each hour passes.
According to NWS guidelines (which I disagree with but that argument is for another day) you take the maximum depth for the day as the official total. The Conservancy most likely will never catch that moment, and another historic, for the time of year, snowfall will go unrecognized. I hope I'm wrong but I probably won't be.

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Re: April 2 2018 storm 5.5 10 AM total. Will wait on Mike to verify

Post by CPcantmeasuresnow on Mon Apr 02, 2018 8:18 am

4.8 inches so far in Central Park.

The big test will be do they get an accurate measurement before 1PM when the snow stops.
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Re: April 2 2018 storm 5.5 10 AM total. Will wait on Mike to verify

Post by CPcantmeasuresnow on Mon Apr 02, 2018 10:50 am

Central Park 5.5 inches at 10 AM which I would guess will be their final total.

Probably close based on Mikes observations.
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Re: April 2 2018 storm 5.5 10 AM total. Will wait on Mike to verify

Post by Math23x7 on Mon Apr 02, 2018 10:58 am

I actually sent this to Upton before I saw the update:

I went to Central Park this morning and took this picture just after nine. This is by the Turtle pond (the Belvedere Castle is on the other side) and there were no tree branches above this ruler that I placed here. I saw that the Conservancy measured 4.8” as of 8 AM. Given the 0.46” of qpf through that time, the ratio is just over 10:1. Between 8 and 9, 0.08” of qpf was observed. Using the 10:1 ratio, it would be approximately 0.8” of snow. This ruler shows about 5.5” of snow, which is consistent with the qpf and the ratios. The next update from the Conservancy should include this new snow. Also, when I took this measurement, it was before I went onto your website to check the snow totals.

(I sent the image I posted in the other thread)

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Re: April 2 2018 storm 5.5 10 AM total. Will wait on Mike to verify

Post by Math23x7 on Mon Apr 02, 2018 10:59 am

Also, I’m now at work so I can’t head back unfortunately

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Re: April 2 2018 storm 5.5 10 AM total. Will wait on Mike to verify

Post by CPcantmeasuresnow on Mon Apr 02, 2018 11:00 am

Math23x7 wrote:I actually sent this to Upton before I saw the update:

I went to Central Park this morning and took this picture just after nine.  This is by the Turtle pond (the Belvedere Castle is on the other side) and there were no tree branches above this ruler that I placed here.  I saw that the Conservancy measured 4.8” as of 8 AM.  Given the 0.46” of qpf through that time, the ratio is just over 10:1.  Between 8 and 9, 0.08” of qpf was observed.  Using the 10:1 ratio, it would be approximately 0.8” of snow.  This ruler shows about 5.5” of snow, which is consistent with the qpf and the ratios.  The next update from the Conservancy should include this new snow.  Also, when I took this measurement, it was before I went onto your website to check the snow totals.

(I sent the image I posted in the other thread)

Mike what do you think the 10Am should have been? Over 6?
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Re: April 2 2018 storm 5.5 10 AM total. Will wait on Mike to verify

Post by Math23x7 on Mon Apr 02, 2018 11:04 am

CPcantmeasuresnow wrote:
Math23x7 wrote:I actually sent this to Upton before I saw the update:

I went to Central Park this morning and took this picture just after nine.  This is by the Turtle pond (the Belvedere Castle is on the other side) and there were no tree branches above this ruler that I placed here.  I saw that the Conservancy measured 4.8” as of 8 AM.  Given the 0.46” of qpf through that time, the ratio is just over 10:1.  Between 8 and 9, 0.08” of qpf was observed.  Using the 10:1 ratio, it would be approximately 0.8” of snow.  This ruler shows about 5.5” of snow, which is consistent with the qpf and the ratios.  The next update from the Conservancy should include this new snow.  Also, when I took this measurement, it was before I went onto your website to check the snow totals.

(I sent the image I posted in the other thread)

Mike what do you think the 10Am should have been? Over 6?

Given that the snow as tapering off and given that the sun angle was increasing and given that the other two nearby NWS stations (EWR, LGA) show similar numbers, I'd say the 5.5" appears to be reasonable.

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Re: April 2 2018 storm 5.5 10 AM total. Will wait on Mike to verify

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