"'Peter Fletcher' via weewx-user" <[email protected]> writes:
> We are having very odd weather for the time of year in Western New York > State, with peak daytime temperatures nearing 70 ºF. It has also been quite > windy. You can see a display of the conditions at my home here. > <https://fletchers-uk.com/weather/index.html> > I am using a Vantage Pro II with the latest version of weewx, and over the > last few days the indicated and graphed wind chill temperature has been > higher than the indicated heat index temperature, despite winds mostly in > the teens (mph). In fact, it looks as if the wind chill temperature is > being set to be numerically equal to the uncorrected outside temperature. I > now know (having looked it up) that the definition of wind chill requires > an air temperature at or below 50 ºF, so that wind chills calculated by > the standard formula for higher temperatures than that are essentially > nonsense, but I don't think that substituting the uncorrected outside > temperature is better. Would it be possible to display (e.g.) N/A for the > wind chill when the temperature is outside the range for which it can be > validly calculated, and blank the relevant point/line on the graphs under > these conditions? A few points: Your wind chill is higher than heat index only because heat index is lower than temperature. You didn't bring that up, so will assume you don't find that a problem, but once you accept heat index being lower than temperature, I don't think you should object to heat index being lower than wind chill. Is your weather station calculating wind chill, or weewx? I would expect this to be from 'hardware' as weewx calls it, from the archive records from the VP2. I have a VP2 and am seeing essentially the same thing. My dewpoint is about 40F. If the definition of wind chill is that it is equal to temperature >= 50F, that's who it should be as the standard approach. I am curious what definition is in use by weewx in your case, and what the relevant definition is from presumably ukmet. If you want an option to have some wind-chill-prime definition that behaves as you want instead, that seems possibly ok, depending on how many people find that useful vs code size increase/maintenance -- 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/rmimtzutffe.fsf%40s1.lexort.com.
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