Author Topic: Weather Underground Issues and Bug Tracking - Check here before posting  (Read 10168 times)

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Offline SoMDWx

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Re: Weather Underground Issues and Bug Tracking - Check here before posting
« Reply #200 on: December 04, 2019, 11:01:55 AM »
Most, if not all, snow measurements are taken manually while rain gauges (with heaters) will report liquid equivalents... There would have to be  way for WU to receive both of those methods much like the NWS local offices do via storm report  and mPing...

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Offline 56kz2slow

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Re: Weather Underground Issues and Bug Tracking - Check here before posting
« Reply #201 on: December 04, 2019, 11:28:15 AM »
On the WU website, snow and rain precipitations are not separated in the hourly, 10-day forecast and history.  Today is fine.  For example here yesterday, we received 5 cm of snow, and 10 mm of rain.  Most weather website separate the two because they are measured with different units of measure, and have a different consistency.

Most weather stations are not designed to distinguish between rain and snow. Weather Underground is designed to be a a website that reports exactly what the stations report. So I don't see this as an issue that needs to be addressed, as I don't see a solution to be implemented.
I'm referring to the forecast sections, not historical.

Edit to add.  I guess in my original post, I mentioned history too.  But given history and forecast are 2 different functions, let's focus on forecast only.
« Last Edit: December 04, 2019, 11:32:34 AM by 56kz2slow »

Offline galfert

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Re: Weather Underground Issues and Bug Tracking - Check here before posting
« Reply #202 on: December 04, 2019, 12:42:25 PM »
On the WU website, snow and rain precipitations are not separated in the hourly, 10-day forecast and history.  Today is fine.  For example here yesterday, we received 5 cm of snow, and 10 mm of rain.  Most weather website separate the two because they are measured with different units of measure, and have a different consistency.

Most weather stations are not designed to distinguish between rain and snow. Weather Underground is designed to be a a website that reports exactly what the stations report. So I don't see this as an issue that needs to be addressed, as I don't see a solution to be implemented.
I'm referring to the forecast sections, not historical.

Edit to add.  I guess in my original post, I mentioned history too.  But given history and forecast are 2 different functions, let's focus on forecast only.

I'm going to defer to others to chime in and see if they agree with you or not that this is a needed feature. The way I see it is it is either a rain day or a snow day. Total precipitation for the day is water content not height of snow.  I suppose it could snow at night and then rain during the daylight hours...but is this really an issue? Its combined because snow is water just like rain. Well maybe I don't see the issue as I live in Florida and I never see snow. Hence why if you get others to agree with you then okay.  Many weather stations measure snowfall by using heaters and they report the melted snow equivalent as rainfall. I don't see the need to separate anything. The only possible issue I see is that snow accumulation height is not reported for the forecast...which has nothing to do with total precipitation...hence no need to separate anything.
« Last Edit: December 04, 2019, 12:44:38 PM by galfert »
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Offline 56kz2slow

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Re: Weather Underground Issues and Bug Tracking - Check here before posting
« Reply #203 on: December 04, 2019, 02:09:14 PM »
I'm going to defer to others to chime in and see if they agree with you or not that this is a needed feature. The way I see it is it is either a rain day or a snow day. Total precipitation for the day is water content not height of snow.  I suppose it could snow at night and then rain during the daylight hours...but is this really an issue? Its combined because snow is water just like rain. Well maybe I don't see the issue as I live in Florida and I never see snow. Hence why if you get others to agree with you then okay.  Many weather stations measure snowfall by using heaters and they report the melted snow equivalent as rainfall. I don't see the need to separate anything. The only possible issue I see is that snow accumulation height is not reported for the forecast...which has nothing to do with total precipitation...hence no need to separate anything.

You are right, most weather stations don't measure snow.  They still use yardsticks in most places.  I'm talking about the hourly and 10 day forecast.  That part is not handled by our PWS, but from WU directly.   The forecast keeps showing mm all the time, even when it's snow which is measured in cm.  For example, it's calling for 2.5 cm in Montréal overnight.  That's 25 mm, but they are showing 2.5 mm in the forecast:   https://www.wunderground.com/forecast/ca/montreal   Oddly, the mobile app does it right.

So, they need to switch the units of measure when switching from rain to snow and back.


Offline galfert

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Re: Weather Underground Issues and Bug Tracking - Check here before posting
« Reply #204 on: December 04, 2019, 02:47:30 PM »
Interesting. So what do they do in the US for snow in regards to units?
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Offline 56kz2slow

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Re: Weather Underground Issues and Bug Tracking - Check here before posting
« Reply #205 on: December 04, 2019, 05:13:23 PM »
Not sure how the do it in US, I believe tenth or hundredth of inches, but the unit is still inches.  I mean, they could express snow in millimetres, but that is not the norm.  However, here they did the conversion to centimetre, but kept the millimetres as the unit.  2.5 cm = 25 mm, that's fine, but 2.5 cm <> 2.5 mm.

Here's an imperial example:
« Last Edit: December 04, 2019, 05:15:24 PM by 56kz2slow »

Offline PaulMy

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Re: Weather Underground Issues and Bug Tracking - Check here before posting
« Reply #206 on: December 04, 2019, 07:18:18 PM »
For the CoCoRaHS participants the US unit for snow is in 1/10"  https://www.cocorahs.org/Content.aspx?page=snow  and for Canada is metric units 0.1 cm

Rain or snow-water-equivalent is in 1/100 inch or .2 mm

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Offline 56kz2slow

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Re: Weather Underground Issues and Bug Tracking - Check here before posting
« Reply #207 on: December 05, 2019, 06:16:03 PM »
I finally found a good example, we have snow in the forecast.  In the top half, the units are metric, bottom half Imperial.  We are supposed to get 2.3" of snow on Dec 11, or 5.8 cm.  However, WU is showing 5.8 mm (0.58 cm).

So the issue is that in Imperial, the unit between rain and snow is the same, however the unit is different in metric, so they convert, but forget to update the unit to reflect the conversion.

Offline galfert

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Re: Weather Underground Issues and Bug Tracking - Check here before posting
« Reply #208 on: December 13, 2019, 12:53:23 PM »
I finally found a good example, we have snow in the forecast.  In the top half, the units are metric, bottom half Imperial.  We are supposed to get 2.3" of snow on Dec 11, or 5.8 cm.  However, WU is showing 5.8 mm (0.58 cm).

So the issue is that in Imperial, the unit between rain and snow is the same, however the unit is different in metric, so they convert, but forget to update the unit to reflect the conversion.

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