Trixology
WeatherCat => WeatherCat Feature Requests => Topic started by: monymony on December 11, 2017, 11:30:12 PM
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In addition to already being able to track daily snowfall, the ability to also track the daily snow depth would be a great addition.
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Yes! I am currently tracking today's snow depth on my banner, but being able to have a record of snow cover by day would be a welcome addition.
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Signed! [snowflake]
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I assume, dangerous as that may be, that depth values are done manually. At least I would think any kind of automatic sensor could be expensive. Snow is so much more fragile than other physical matter. It doesn?t take much to disturb it and thereby alter its state/shape and possibly its proximity to the measuring device. I can think of many complex ways to measure but they all have a weakness and probably reliability problems. I would think even picking a location could seriously affect the data. Anyone know how the NWS or other official organizations measure this stuff? I suspect the local NWS office uses a pre-cooled yard stick! Maybe just a foot long ruler!! [lol] We usually fire any weatherman who doesn?t prevent any snow accumulation!! [rolleyes2]
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Here you go, X-Air:
https://cocorahs.org/media/docs/measuringSnow2.1.pdf
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Here you go, X-Air:
https://cocorahs.org/media/docs/measuringSnow2.1.pdf
That is exactly how I do it.
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Thanks for the link! As I said, it's rather complicated and it's prone to lots of human erer! Plus, this method is completely manual, absolutely no kind of "automation".
Of course, the human error part is mitigated with important tips like: "Before it snows, put your snow measuring board outside." It's probably very frustrating to also forget where that board is! "Oops! Can I still measure the snow on the board with my size 13 foot print?"
Personally, I prefer our local method of simply firing any weather person who allows:- more than two inches for one event
- more than 2 days of ground coverage
I'm sure most of those who enjoy snow and weather data collection don't mind doing the work required to do the measuring. For folks who only get problems from occasional snow, I doubt many will do this for free. [blush]
As I understand the process described, you are not really asking for an automatic/mechanical/electronic device as much as a place to enter the data in WC. Of course, WC would need to make use of the data. That is a somewhat easier task, after all, "programming is simply typing"! cmu:-)
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Ref: Forgetting the location of the snowboard
See slides 7 & 8 ... snow flags or reflectors prevent forgetting unless you?re in Blick country where the snow depth sometimes covers and/or drifts over the flags. Mine are 48 inches tall and luckily I haven?t seen a snowfall that deep.
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My two cents, or maybe three...
I am measuring the new fallen snow now since a while and I accumulate the fallen snow yearly (seasonly). Till now I was not interested in measuring snow coverage, but as Meteotemplate offers this as an option I began to do so since yesterday (major snowfall) and try to continue the rest of the season. The quality goal is to be exact in new/fresh fallen snow, not in the depth of coverage. This is only interesting for me if the was a closed snow surface or not. To get really exact measurements of snow depth there is no way to go around such a toy like this:
http://www.sommer.at/en/products/snow-ice/snow-depth-sensor-ush-8
I think I am going to ask them if I should sell my Ferrari for it or only the Fiat. lol(1)
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If you have the ability to DIY electronics, then there are plenty of threads on the wx forum about hacking laser (and ultrasonic) "tape" measures into snow depth measuring devices. They provide an automated method that is easier on the pocket - if not the brain.
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Since I know absolutely nothing about the point of measuring snow depth...
I would think the amount of water in the snow would be of more importance than the depth (unless one runs a ski resort). The pdf covers converting the frozen precip to liquid. I think that the discussion spoke of doing these manual inspections at a specific time each day. I assume that also meant only once a day. However, a lot of snow could sublimate in 24 hours, so the amount of water may still not equate to how much finally gets into the soil or aquifer. I guess I'm not sure what the measurements are actually for nor how accurate they may be in meeting that purpose.
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xair:
I think a graph such as this one used by the avalanche warning authority in Tyrol may show a good use of tracking snow depth:
(In addition to that: Aren't weather data collectors a bit crazy? So why not collect this data, too? ;D )
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In addition to that: Aren't weather data collectors a bit crazy? So why not collect this data, too?
Are you asking for data on craziness or snow depth?! I'll admit to being more than a bit crazy. And I don't like snow as much as I did in my much younger days.
Seriously, avalanche warnings are certainly worth knowing. Around here, we still have to warn people not to drive on flooded roads... talk about crazy people! And there are people who actually chase tornadoes!!! They usually only catch one... [banghead] [rolleyes2]
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Just to clarify, this would be exactly the same as daily snowfall, but for the current depth of snow?
What data could be derived/calculated from this data - currently the daily snow capture allows the calculation of accumulated snow over a period of time - for example weekly, monthly or annual. What could be done with snow depth - average over a period of time? - i.e. average snow depth in December...
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Just to clarify, this would be exactly the same as daily snowfall, but for the current depth of snow?
For me that would be perfect.
What data could be derived/calculated from this data - currently the daily snow capture allows the calculation of accumulated snow over a period of time - for example weekly, monthly or annual. What could be done with snow depth - average over a period of time? - i.e. average snow depth in December...
A graph like the attached one or that I posted yesterday? Not the accumulated snow over the period, but the real coverage of the surface.
:)
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Another example, I feeded December 2017 in Meteotemplate with manual readings:
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Just to clarify, this would be exactly the same as daily snowfall, but for the current depth of snow?
Yes, this would be the same as the daily snow.
For why, daily history, consecutive days with snow on ground, maximum snow depth for season all quickly come to mind. If I did not just wake up I?m sure I could think of many more. :)
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What data could be derived/calculated from this data - currently the daily snow capture allows the calculation of accumulated snow over a period of time - for example weekly, monthly or annual. What could be done with snow depth - average over a period of time? - i.e. average snow depth in December...
CoCoRaHs and other organizations want NEW snow depth, and TOTAL depth of snow on the ground. So if I had 8" on the ground yesterday, and it snowed 4" today, I would measure and find the total depth, which would be something equal to or less than 12". NWS wants two measurements a day, 12 hours apart. Even on a day without NEW snow, the measurement usually change due to melting or compacting.
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Yep, as Steve said. See attached screenshot from the CoCoRaHS training materials.
SWE = Snow Water Equivalent (the amount of water content in a snowfall)
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Thanks for the feedback folks - added to the list [tup]
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Just working on the 3.1 plan - I've added this one there, but it may still move out (draft plan).
Cheers,
Stu.
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If you have the ability to DIY electronics, then there are plenty of threads on the wx forum about hacking laser (and ultrasonic) "tape" measures into snow depth measuring devices. They provide an automated method that is easier on the pocket - if not the brain.
Perhaps an Arduino connected to a downward-pointing ultrasonic sensor would work. A software library (free) converts the pulse return time to a fairly accurate distance measurement. The two devices together will cost between 10 and 20 USD.