My apologies. I probably could have phrased that better. You are correct that VP2s can generate windchill via hardware; however, an older unit like mine with older firmware doesn't send the windchill value in the LOOP packets.
On Tuesday, January 3, 2023 at 9:39:03 AM UTC-5 [email protected] wrote: > > 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 <[email protected]> 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. > > ------- > [email protected] > Jul 24, 2020, 8:21:48 PM > > to weewx-user > Geez, Gary, you're right! So, you would also have to specify LOOP2 > packets. See the section [Vantage] > <http://www.weewx.com/docs/usersguide.htm#[Vantage]> in the User's Guide. > > [Vantage] > loop_request = 2 > > > -tk > > On Fri, Jul 24, 2020 at 5:13 PM gjr80 <[email protected] > <https://groups.google.com/>> wrote: > 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 [email protected] > 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). >> >> On Dec 31, 2022, at 9:21 AM, Steve Schindler <[email protected]> wrote: >> >> 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> >> >> -- >> You received this message because you are subscribed to the Google Groups >> "weewx-user" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected]. >> To view this discussion on the web visit >> https://groups.google.com/d/msgid/weewx-user/183e065c-2fc6-4b2b-aaff-99ec35fa8ca1n%40googlegroups.com >> >> <https://groups.google.com/d/msgid/weewx-user/183e065c-2fc6-4b2b-aaff-99ec35fa8ca1n%40googlegroups.com?utm_medium=email&utm_source=footer> >> . >> >> >> <wx 2022-12-25 20:56:20.png> >> >> <wx 2022-12-24 20:42:02.png> >> >> -- > You received this message because you are subscribed to the Google Groups > "weewx-user" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > > To view this discussion on the web visit > https://groups.google.com/d/msgid/weewx-user/70448a2d-6bfb-4e85-9e56-97f489dbf515n%40googlegroups.com > > <https://groups.google.com/d/msgid/weewx-user/70448a2d-6bfb-4e85-9e56-97f489dbf515n%40googlegroups.com?utm_medium=email&utm_source=footer> > . > > -- You received this message because you are subscribed to the Google Groups "weewx-user" group. 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