My heat index never works right

[David Barto]

Vantage Pro 2. The heat index reports correctly on the console, but on both the standard skin and on BelcherTown I get the following:

Note how the heat index becomes the temperature at the same point that the humidity falls below 40%. Happened yesterday and again today. I’m having Weewx calculate the heat index in software now, and it failed the identical way when I was using the hardware.

Why is this? The heat index doesn’t step function to be the temperature in real life like that.

David

[Tom Keffer]

I tend to agree. Originally, the calculation was based on this chart, which is not valid below 40°F. But, there are other methods of calculating it.

Opened issue #601 to remind us. This is an easy task if someone wants to take it on.

-tk

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[David Barto]

And when it is fixed, I’ll have a solid reason to upgrade from 3.9.2. 8^)

What a great ‘experimental’ system, now in its 4th major release cycle. When will the experimental tag be coming off?

Thanks,

David

On Sep 5, 2020, at 10:28 AM, Tom Keffer <tke...@gmail.com> wrote:

I tend to agree. Originally, the calculation was based on this chart, which is not valid below 40°F. But, there are other methods of calculating it.

Opened issue #601 to remind us. This is an easy task if someone wants to take it on.

-tk

On Sat, Sep 5, 2020 at 9:59 AM David Barto <ba...@kdbarto.org> wrote:

Vantage Pro 2. The heat index reports correctly on the console, but on both the standard skin and on BelcherTown I get the following:

<Screen Shot 2020-09-05 at 9.57.42 AM.png>

Note how the heat index becomes the temperature at the same point that the humidity falls below 40%. Happened yesterday and again today. I’m having Weewx calculate the heat index in software now, and it failed the identical way when I was using the hardware.

Why is this? The heat index doesn’t step function to be the temperature in real life like that.

David

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[Tom Keffer]

LOL! The experiment is never over.

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[Tom Keffer]

Fixed in commit 4a0a9c1, to appear in V4.2.