Gaper question: NWAC's 24 hour snowfall

Exactly how does the 24 hour snowfall sensor work at NWAC's telemtry sites? It seems to reset itself at a set interval, is this correct? If so what is that interval?

0.166666667

What's that based on? If you look at the telemetry data below, if the 24 hour snowfall was reset at 4am then it must of snowed 5"s between 4am and 5am, which I don't think happend:<br><br> MM/DD Hour Temp Temp RH RH Wind Wind Wind Hour Total 24 Hr Total<br> PST F F % % Avg Max Dir Prec. Prec. Snow Snow<br> 6600' 5250' 6600' 5250' 6600' 6600' 6600' 5250' 5250' 5250' 5250'<br>

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<br> 1 29 2300 31 34 100 93 37 62 253 0 0 -0 110<br> 1 30 0 30 33 98 90 38 63 251 0 0 -0 110<br> 1 30 100 30 32 100 100 42 62 249 .03 .03 -0 108<br> 1 30 200 25 28 99 99 31 55 259 .19 .22 2 112<br> 1 30 300 23 26 98 99 27 53 264 .12 .34 3 112<br> 1 30 400 22 25 98 99 27 44 256 .11 .45 4 113<br> 1 30 500 21 25 98 99 28 52 262 .06 .51 5 116<br> 1 30 600 21 24 98 98 30 66 275 .09 .6 6 115<br> 1 30 700 20 24 97 98 29 57 280 .11 .71 7 114<br> 1 30 800 19 22 97 98 30 60 283 .08 .79 9 116<br> 1 30 900 19 22 97 98 35 65 278 .05 .84 9 118<br> 1 30 1000 20 22 97 97 35 71 279 .04 .88 11 119<br> 1 30 1100 21 22 97 97 34 65 280 .07 .95 11 117<br> 1 30 1200 21 22 97 97 36 63 281 .07 1.02 12 118<br> 1 30 1300 19 21 97 97 29 60 275 .06 1.08 12 117<br> 1 30 1400 21 22 97 97 38 65 279 .05 1.13 13 117<br> 1 30 1500 19 22 97 97 32 57 280 .09 1.22 14 114<br> 1 30 1600 20 21 97 97 31 58 281 .08 1.3 14 117<br> 1 30 1700 21 20 98 97 34 56 281 .03 1.33 14 119<br> 1 30 1800 17 20 96 96 32 51 280 0 1.33 15 119<br> 1 30 1900 18 20 96 97 32 58 286 .02 1.35 44 116<br> 1 30 2000 18 20 96 97 35 57 288 .02 1.37 15 118<br> 1 30 2100 18 20 97 97 26 43 277 .05 1.42 16 116<br> 1 30 2200 18 21 96 97 31 47 286 .08 1.5 16 119<br>

They typically reset at 6AM, although I see some variations. It isn't really "24-hour snowfall" but "snowfall since 6AM". You can see the resetting behaviour more clearly if you look at the snowfall views in the Powderstash telemetry graphs.

So does someone have to manually reset the 24 hour counter? If that's the case then for Hood Meadows (which is what's above and what Frieshie linked to on his amazing site), Meadows most of either 1) skipped resetting their counter or 2) resest it at 1am on Friday morning in order to obtain that 19" in 24hour figure. <br><br>Gaper Jeffey

I find the "24 hr snow" data most useful when compared to the "total snow" (snow depth) and "Precip" data. Sometimes one of these sets of data has errors, and can be discounted by comparing to the others. The "total snow" (snow depth) info is also useful because you can look at increases (or decreases, with rain) over any time period you'd like, without having to take into account the re-setting factor. You can even see snowpack settling during dry spells in this data.<br><br>freshie, I was updating the Weather Links section and added a link to your telemetry graphs (Mountain Conditions menu) - hope that's OK. The graphs are a nice way to get another view of the telemetry data, and I can see them now on my new computer. Thanks!