> Tom and Gary confirmed that the VP2 hardware generated values for windchill are only available in the LOOP2 packets.
I’m not sure why you think that is relevant. The question is, whether software or hardware generated, do the loop packets have windchill. I confirmed they do contain windchill (for my VP2) before my initial reply. On Jan 3, 2023, at 6:06 AM, Steve Schindler <schi...@gmail.com> wrote:
Thanks for the suggestion but I don't think that's the issue with my setup. In a previous discussion (https://groups.google.com/g/weewx-user/c/roOG0u8YPX4/m/Tc4vWnznAgAJ), Tom and Gary confirmed that the VP2 hardware generated values for windchill are only available in the LOOP2 packets.
------- tke...@gmail.com
Geez, Gary, you're right! So, you would also have to specify LOOP2 packets. See the section [Vantage] in the User's Guide.
[Vantage] loop_request = 2
-tk Windchill is only in included in the Davis LOOP2 packet, it’s not in the LOOP packet or archive record (the defaults) from the console. So unless you have set WeeWX to use the LOOP2 packet WeeWX will never see windchill from the console, irrespective of StdWXCalculate settings. Gary -------
And the User's Guide states "Not all stations support LOOP2 data. You need firmware version 1.90 or later."
So I don't think the loop_hilo parameter will affect the windchill value with my setup.
On Saturday, December 31, 2022 at 1:07:01 PM UTC-5 jo...@johnkline.com wrote:
Tom and friends will know for sure, but I believe the low you are seeing (at 07:31) is from the archive_day_windchill table.
You likely have the following in your weewx.conf # Whether to include LOOP data in hi/low statistics loop_hilo = True
This tells weewx (well, it tells it to do exactly what the comment says). Note: vantage loop packets do indeed include windchill.
The archive table (produced from vantage archive records) does not include this low and the graphs are produced from archive records.
I don’t think you are seeing anything *wrong*.
Note: these highs and lows in the daily stats get wiped out if you run wee_database —rebuild-daily (which is unfortunate). During the recent cold weather, I noticed a discrepancy between the windchill minimum value in the table and the value/time shown on the graph. For 12-24-22, the
Low Wind Chill in the Since Midnight table is 23.6F at 07:31, but the
graph doesn't reflect that value. It shows a low of about 27F at
about 8:00. For 12-25-22, the temperature discrepancy is about the same
but time difference is greater. See the screenshots below. All other values (temp, humidity, wind) agree between the table and the graphs.
I'm using a Davis VP2 with firmware version 1.82 so WeeWX is
calculating the windchill value.
Any thoughts on what's happening and how it can be corrected?
I'm in Florida so my troubleshooting/testing opportunities are limited to when a cold front passes through. However, I suspect that heat index has the same
problem and, if so, I'll have plenty of time to work on that that this summer.
:-) 12-24
<wx 2022-12-24 20:42:02.png>
12-25
<wx 2022-12-25 20:56:20.png>
<wx 2022-12-25 20:56:20.png>
<wx 2022-12-24 20:42:02.png>
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