Reactions to : Introducing RainCheck

Excited to see this. It sounds like a great solution. Of course I’m bummed to be located outside the contiguous lower-48 states though. Here in Alaska, we’re a little data sparse but I would hope there is enough available data to expand RainCheck calibrations to this part of North America. Would really love to see the RainCheck data expanded to include Alaska.


Awesome! Will this hopefully fix the issue where heavy rain is underreported? I know in thunderstorms here in the US I’ve had the final amounts be 2-4x lower than nearby stations and radar estimates indicate, mainly during thunderstorms or heavy rain events.


I assume this will mean that over time the Sky’s reported rain should eventually match the RainCheck value.


I live in a region with very isolated rain/thunderstorms. I often get accumulation when the Dept. of transportation station 2 miles away shows 0. I want CL, but still desire autonomy from the ‘official’ readings. The corrected rainfall from Saturday now shows 0.00", whereas we had several downpours in the afternoon that originally reported .08". Also of interest, the daily accumulation over the last few days is now 0.00, but I still have duration reports of 6 minutes, 5 minutes, etc. :slight_smile:

I studied your approach to “always improving” using this forum before I purchased my system a few weeks ago. This kind of serious improvement work is another great example of the WF approach to this set of devices - congratulations on continually working with your users to improve the experience and giving users the ability to opt-out if they don’t like the change. This will lead to much success for your company. I looked at my station via a web browser a few minutes ago and saw that logo already showing next to yesterday’s data.


This is the last 7 days readings from my peet bros pro
compared to my Sky. Sky is column two. Not bad !
.04 .04
.03 .05
.00 .00
.21 .17
.84 .83
.40 .37
.65 .87


Do we have an exact date to look for on this update. Last storm my weather flow was off by over 2”. Was a very heavy storm. Actual total rain fall was 3.49” WF showed 2.05”. This data was for June 6, 2019 in Farmington AR 72730

It should be visible now or at least by tomorrow. Check your station on the Web if you don’t have the updated app yet. If you see the RainCheck logo next to yesterday’s precipitation value, then it is in place.


Merci pour l’info, à quand l’utilisation de ce service en France ? :slight_smile:

Mine actually adjusted the rainfall amounts for everything I’ve seen in June. It fixed a lot of the low amounts and bumped them up much closer to where they should have been. Try going back in the weatherflow app and checking the history for that day to see if it changed.

I saw that past rainfall totals have changed upward for me.
My question is if the current rainfall amounts are affected. We are having heavy showers now and WF has .37" but my Stratus rain gauge has .55". Rain check is on.

We agree!

Yes, RainCheck will help with both under- and over-reporting in the raw values.

Correct, over time the difference between the raw value and the RainCheck value should decrease.

Very interesting. It’s definitely possible for RainCheck to miss very brief showers that your SKY records, resulting in RainCheck “zeroing out” rain that actually fell. We will be looking at improved rules for when RainCheck should “zero out” raw data (essentially tagging it “false rain” - which is another part of the CL process for rain), vs. leaving it non-zero.

Note, when RainCheck “zeroes out” your SKY this does not affect the ongoing auto-calibration part of the CL process for your SKY.

Good catch. There was a bug in the web app causing that issue, and it has just been fixed. Please let us know if you’re seeing this bug in one of the mobile apps.

Thanks for being one of those engaged users, Ron!

RainCheck has been running since June 1. Checking your station, the RainCheck value shows 2.74" for June 6 at your location.

Not directly. RainCheck is updated once a day for yesterday’s rain so it does not apply to current (raw) rainfall amounts shown in the app. Look for the RainCheck logo to indicate the RainCheck value.

I say “not directly” because the ongoing auto-calibration side of the rain component of CL will adjust the calibration over time, and that does affect the raw value you see before RainCheck runs.


I am not clear on where the setting is to allow the rain data to flow into weather underground.

Referencing this post:

As part of this rollout, we will also be making a change to the way we push data to Weather Underground. In the interest of quality, since RainCheck operates several hours after the data is collected, and since WU is unable to update data after the fact, we will NOT be providing precipitation data to WU by default for new stations linked to WU. There will be no change for existing users. And all users will be able to specify whether their SKY’s precipitation data is pushed to WU or not via an option in the app.


It’ll update the next day after 8am with the adjusted total. As time goes on the calibration will bring it so that both are pretty close to reality. How close did yours end up being to the stratus after adjusting?

This last rain was strange. WF had .38" before calibration. Calibration brought the total WF rain to .39".
Stratus had .55".
The previous adjustments brought the WF very close to the Stratus gauge.

I would say in a few weeks it should get pretty close to it as the CL process continues. I’m still waiting for a good thunderstorm here but already I had a nice heavy shower. It showed .18 and radar estimated .18-.20 over my house so pretty much dead on. I’m pretty excited because previously a heavy shower like this would register .08-.10 and would be too low.

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Sorry if I missed this detail, but can I still view the previous raw, uncorrected rain data somewhere after 8a each day? I myself am a CoCoRaHS observer and have been keeping tabs on my manual readings vs. observations from SKY. (Needless to say, they’re really close!)

I have an example from last week even where the two were off by 0.06” (WF: 0.16, me: 0.10, not bad really) but now WF changed to show as 0.11 with RainCheck. If I hadn’t jotted the old reading down before this change (or gotten to it before the correction was applied), I’ll no longer be able to monitor this.

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I have had a couple different rain events now that used the rain check. However, this has made the data significantly worse. For example, it rained for 42 minutes yesterday and the SKY recorded 0.1" of rain. A little high, but very close. Actual was around 0.07" according to my 4" gauge. For both events now, the rain check has adjusted my data to read 0.00" of rain. Should I just opt out of this feature? Or is there another solution?

That actually seems like the raincheck did a pretty good job then, within .01 is excellent. I haven’t found a way to view the stats after it updates to the raincheck value but what I do is check it at the end of the day or before 8am the next day to see what the difference was.

cmottice, I saw where someone else reported the same thing happening. It may be a bug with it zeroing that out, maybe one of the staff members can provide some insight on that.

It has really rained hard over the last 5 to 6 hours. Every station around me is reporting much higher amounts of rain than me. We just installed this 5 days ago so we are new. However, I was expecting to see a much higher rainfall total based on the intensity of the rain and the length of time. We live on a lake and the water that pooled on the ground doesn’t pool without a huge rainfall amount. I will give it time but both my wife and I don’t believe our precipitation readout.