Welcome to the Cumulus Support forum.

Latest Cumulus MX V4 release 4.4.2 (build 4085) - 12 March 2025

Latest Cumulus MX V3 release 3.28.6 (build 3283) - 21 March 2024

Legacy Cumulus 1 release 1.9.4 (build 1099) - 28 November 2014
(a patch is available for 1.9.4 build 1099 that extends the date range of drop-down menus to 2030)

Download the Software (Cumulus MX / Cumulus 1 and other related items) from the Wiki

If you are posting a new Topic about an error or if you need help PLEASE read this first viewtopic.php?p=164080#p164080

discrepancy value of rain rate

Discussion specific to Davis weather stations
Post Reply
User avatar
actioman
Posts: 118
Joined: Sat 20 Mar 2010 1:01 am
Weather Station: Davis Vantage Pro2 Plus
Operating System: Windows XP SP3
Location: Elvas, Portugal
Contact:

discrepancy value of rain rate

Post by actioman »

Yesterday I noticed there is a discrepancy in the amount of rain rate recorded and shown on the graphs?

Image

Image

It happens to anyone else? Is it a bug?

As you can see in my previous weather station, a fine-offset one, this was more accurate!? :?

Image

Image

Thank you in advance for any help.
Kind Regards, Manuel.

Image
User avatar
mcrossley
Posts: 14388
Joined: Thu 07 Jan 2010 9:44 pm
Weather Station: Davis VP2/WLL
Operating System: Bullseye Lite rPi
Location: Wilmslow, Cheshire, UK
Contact:

Re: discrepancy value of rain rate

Post by mcrossley »

User avatar
actioman
Posts: 118
Joined: Sat 20 Mar 2010 1:01 am
Weather Station: Davis Vantage Pro2 Plus
Operating System: Windows XP SP3
Location: Elvas, Portugal
Contact:

Re: discrepancy value of rain rate

Post by actioman »

Yes indeed helps.
What I did not know was that the same applied to the rain rate data.

Thank you Mark for your help. :)
Kind Regards, Manuel.

Image
User avatar
actioman
Posts: 118
Joined: Sat 20 Mar 2010 1:01 am
Weather Station: Davis Vantage Pro2 Plus
Operating System: Windows XP SP3
Location: Elvas, Portugal
Contact:

Re: discrepancy value of rain rate

Post by actioman »

Yet another question about the same topic.

Before with a fine-offset weather station whenever recorded 0.3 mm of rainfall (which was its least), marked a 3.5 mm of rain-rate, now with the Davis when it registers the 0.2 mm of rain does not mark anything in the rain-rate graph.

This is normal?

Thanks! ;)
Kind Regards, Manuel.

Image
User avatar
steve
Cumulus Author
Posts: 26672
Joined: Mon 02 Jun 2008 6:49 pm
Weather Station: None
Operating System: None
Location: Vienne, France
Contact:

Re: discrepancy value of rain rate

Post by steve »

Yes, it's the way Davis stations calculate rain rate - by the time between tips. So it takes two tips within 15 minutes before it shows a rain rate.

If you want to know more about how your station calculates some of its data (including the answer to your rain rate question), there's a useful document from Davis here: http://davisnet.com/product_documents/w ... iables.pdf
Steve
User avatar
actioman
Posts: 118
Joined: Sat 20 Mar 2010 1:01 am
Weather Station: Davis Vantage Pro2 Plus
Operating System: Windows XP SP3
Location: Elvas, Portugal
Contact:

Re: discrepancy value of rain rate

Post by actioman »

Hi Steve.

Thank you for your answer and the link with so useful information.

I hope you already have your contact lenses and everything is well now with your vision! ;)
Kind Regards, Manuel.

Image
User avatar
steve
Cumulus Author
Posts: 26672
Joined: Mon 02 Jun 2008 6:49 pm
Weather Station: None
Operating System: None
Location: Vienne, France
Contact:

Re: discrepancy value of rain rate

Post by steve »

actioman wrote:I hope you already have your contact lenses and everything is well now with your vision! ;)
No, I'm afraid not; I'm hoping they come in the post this morning. I'm still having to use some glasses that I'm not used to :(
Steve
Post Reply