Thanks for the explanation. That is pretty clear. I guess my confusion lies in that the graph says "hourly rainfall" but is showing interval rainfall. I'm not sure what it should show, to be honest. With a archive interval of 180 seconds, should it multiply by 20 to what the hourly rain would be if that rate lasted for an hour? An aggregation?
What I see now with the scale set to inches while the values are in the hundredths... just looks weird. Dave On Wed, Sep 12, 2018 at 1:31 PM Thomas Keffer <[email protected]> wrote: > "rain" is the amount of rain that fell in the archive interval. > > "rainRate" is a derived quantity, calculated by StdWXCalculate. It's the > amount of rain in a fixed period, divided by the length of that period. The > period is set by option rain_period, with a default of 900 seconds (15 > minutes). > > Posts to the WU use something completely different: the amount of rain > that fell during the preceding 60 minutes. Presumably, the WU then takes > deltas on this number to calculate whatever it is that they are showing. > > -tk > > > On Wed, Sep 12, 2018 at 10:52 AM Pat <[email protected]> wrote: > >> Dave, >> >> The "Rainfall" in your graph is a really a bucket tip as I understand it. >> So if it's only showing 0.01 or 0.02 then that's how many tips per archive >> interval. The code that generates that graph is here >> <https://github.com/poblabs/weewx-belchertown/blob/master/bin/user/belchertown_highchartsSearchX.py#L140> >> . >> >> The wunderground page shows the precip rate. >> >> So I think you're looking for the weewx observation rainRate and not rain >> (which shows the 'bucket tips')...? >> >> For giggles, and since today is a rainy day for me it's easy to test >> this, I changed the SQL to rainRate instead of rain and it gave me the >> graph attached - which is slightly different than wunderground. Not sure >> why to be honest... >> >> >> >> On Tuesday, September 11, 2018 at 11:00:54 AM UTC-4, David Hathaway wrote: >>> >>> Pat, >>> >>> How do I get a reasonable "Rainfall" value on the chart. The Rainfall >>> Total graph looks fine, but the amount looks factored down. I have changed >>> my interval to 5 minutes last week, so I am not sure that is the issue. >>> Meanwhile, the text reports highest rainfall rate was 2.45 in/hr. Not sure >>> what to tweak. >>> >>> See attached. You can also visit >>> >>> https://hathaway.house/weewx/belchertown/ >>> >>> and Wunderground to compare: >>> >>> >>> https://www.wunderground.com/personal-weather-station/dashboard?ID=KTXSUGAR19 >>> >>> Dave >>> >>> >>> -- >> You received this message because you are subscribed to the Google Groups >> "weewx-user" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected]. >> For more options, visit https://groups.google.com/d/optout. >> > -- > You received this message because you are subscribed to a topic in the > Google Groups "weewx-user" group. > To unsubscribe from this topic, visit > https://groups.google.com/d/topic/weewx-user/GSrKZEiPqsc/unsubscribe. > To unsubscribe from this group and all its topics, send an email to > [email protected]. > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "weewx-user" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
