They may be reporting every 2.5 secs, but I believe the rain rate is only updated every 20 seconds. To make matters worse, looking at the davis comms protocol it is not clear what they actually output - as rainrate is defined as clicks per hour! Loop2 packets include 15 minute rainfall, hour rainfall, dialy rainfall - all looks quite complex, and that is just for davis stations!!
Have fun, I'm not commenting further. On Friday, 3 August 2018 08:24:39 UTC+3, Praveen Chandrasekaran wrote: > > Davis vantage stations report every 2.5 seconds I believe and the rainfall > rate is also calculated so. Atleast for stations reporting in rapidfire > mode I believe the same value that gets displayed on the console can be > sent to WU also? > > On Fri, 3 Aug 2018 at 10:43, Andrew Milner <[email protected] > <javascript:>> wrote: > >> Rainfall as a rate is some amount of rain per some defined time period. >> OK, we can measure the rain quantity - but what is the time period over >> which the rain has fallen?? Instantaneous would be a time period of zero >> so would result in zero!! So do we use 1 second, 5 seconds, 10 seconds, 1 >> minute, 5 minutes, 10 minutes, or one hour as the time period?? If you use >> say 10 seconds then I suppose you need to report every 10 seconds (colossal >> overheads at WU if every staion reported every 10 seconds). However, if >> you report every 10 minutes but have a rainrate over a 10 second period, >> what do you report to WU as the rainrate for the 10 minute period? You >> cannot just upload the 10 second rate as over the 10 minute period it would >> not be correct!! So, you are almost forced into the current WU arrangement >> as possibly being the best compromise situation...….. >> >> My view anyway ……. >> >> >> >> On Friday, 3 August 2018 07:17:13 UTC+3, Praveen Chandrasekaran wrote: >>> >>> Hi, >>> >>> I am discussing with Tim Roche of WU over trello on rainfall rate in WU. >>> Ideally I would have liked if WU reported instantaneous rainfall rate than >>> the accumulated rainfall in last 60 minutes. Here is what Tim Roche replied >>> on trello: >>> >>> Rainfall rate and daily precip are inputs to the PWS data. if they are >>> sent we use them. >>> >>> http://wiki.wunderground.com/index.php/PWS_-_Upload_Protocol >>> >>> >>> I have again replied to him with the below: >>> >>> >>> The PWS upload protocol only has below: >>> >>> rainin - [rain inches over the past hour)] -- the accumulated rainfall >>> in the past 60 min >>> >>> This is not instantaneous rainfall rate. This is interpreted as the >>> rainfall accumulated in past 60 mins and sent by weewx to WU. Some details >>> on same in below thread too: >>> https://www.wxforum.net/index.php?topic=9155.0 >>> >>> >>> I was just wondering if weewx can be hacked/modified to send >>> instantaenous rainfall rates instead of SQLSUM. If so where should I make >>> the changes? (restful.py) >>> >>> >>> Maybe others here can also chime in on the trello board so that we can >>> sort out this issue. Reporting rainfall over last hour as rainfall rate >>> doesn't make sense. Particularly in tropical areas where we may get short 5 >>> minutes bursts of rains. >>> >>> >>> Trello board link: >>> >>> >>> https://trello.com/c/roVxyTpV/29-submit-bug-reports-june-july-2018 >>> >>> >>> Regards, >>> >>> Praveen >>> >>> >>> -- >> 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/RIPidfs42h0/unsubscribe. >> To unsubscribe from this group and all its topics, send an email to >> [email protected] <javascript:>. >> 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.
