WeatherFlow integration: Incorrect values for vapor pressure(inHg) & wind speed (mph)

[stevemha]

The problem

The new WeatherFlow integration in Home Assistant core has a couple of problems possibly involving unit conversions.
(1) Vapor pressure is currently reporting values 50.75752 inHg, much larger than the reported air pressure of 29.84979 inHg. It is physically impossible for vapor pressure to exceed atmospheric air pressure. (Other related values reported to Home Assistant are: Dew point = 59.2 deg F; Humidity = 77.19%)
(2) Wind speed, gusts, and lulls reported to Home Assistant in miles/hour (mph) are lower than those reported in the Tempest App (also in mph) by a factor of approximately 3.6.

What version of Home Assistant Core has the issue?

core-2023.10.0

What was the last working version of Home Assistant Core?

none. WeatherFlow integration is new with version 2023.10

What type of installation are you running?

Home Assistant OS

Integration causing the issue

WeatherFlow

Link to integration documentation on our website

https://www.home-assistant.io/integrations/weatherflow/

Diagnostics information

No error messages observed

Example YAML snippet

No response

Anything in the logs that might be useful for us?

No response

Additional information

No response

[home-assistant]

Hey there @natekspencer, @jeeftor, mind taking a look at this issue as it has been labeled with an integration (weatherflow) you are listed as a code owner for? Thanks!

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[jeeftor]

if you modify your config file and turn on debugging for pyweatherflowudp we can see the values I believe and can probalby reverse engineer whats going on...

[stevemha]

I added the following in my configuration.yaml file and restarted Home Assistant.
logger:
logs:
pyweatherflowudp: debug

Is that what you had in mind? Under Settings > System > Logs, I do not see any log entries mentioning weatherflow.

I repeated with "pyweatherflowudp: info" in configuration.yaml and still don't see any log entries mentioning weatherflow.

Am I doing the wrong thing or looking in the wrong place?
Thanks.

[natekspencer]

FYI, The wind speed values were corrected in 2023.10.1. There was an incorrect native unit assigned to them. I've not seen an issue with vapor pressure values though

[stevemha]

Thanks for the wind speed correction--and for the WeatherFlow integration. Great job!
I can get along without the vapor pressure data, but for your information my current conditions (71.7 deg F temperature, 55.17% humidity, 54.8 deg F dew point) should lead to a vapor pressure of 1.466 kPa or 0.4329 inches of Hg according to my calculations. The WeatherFlow integration is reporting a vapor pressure 43.25 inches of Hg--a factor of 100 higher than my calculations indicate. In any case, current air pressure is 29.87 inches of Hg, and vapor pressure cannot possibly be higher than the air pressure.

Thanks!

[stevemha]

A factor of 100 vapor pressure error could occur if source units were switched between kPa and bar.

[natekspencer]

A factor of 100 vapor pressure error could occur if source units were switched between kPa and bar.

I was able to find the issue in the library. Thanks!

[jeeftor]

👏🏼