Hi,
A little background as to how WeeWX takes loop data and generates archive
records to save to database. WeeWX accumulates the loop data seen during an
archive interval and when using software record generation (as you are) WeeWX
synthesises an archive record from the accumulated loop data at the end of the
archive period. The value for each observation in the archive record is
calculated from the accumulated values using an extractor function. The default
extractor function is ‘average’. Average is fine for most observations (eg
temperatures and pressures) but is unsuitable for something like rain. For rain
we use ‘sum’ as the extractor function. WeeWX supports the following extractor
functions; avg, count, last, max, min, noop, sum and wind. Each is pretty self
explanatory except for noop and wind. Noop does nothing and wind is a special
extractor that returns wind speed and direction as well as wind gust speed and
wind gust direction.
So in your case you are seeing WeeWX apply the default average extractor to
your lightning data. Clearly that is not what you want for lightning strike
count, you want ‘sum’ just as for rain. Fortunately, you can tell WeeWX what
extractor function to use for an observation. In weewx.conf look for an
[Accumulator] stanza and add an entry as follows:
[Accumulator]
[[lightning_strike_count]]
extractor = sum
If you don’t have an [Accumulator] stanza just add it at the end of the file.
As for lightning_distance, it really depends what you want to extract. There
would seem to be a few possibilities, avg and min seem the two most likely but
you could also use last. I guess it comes down to what data you want to
record/display. Once you’ve worked that out just add an appropriate extractor
entry for lightning_distance.
Oh, and once you have finished your changes to weewx.conf you will need to
restart WeeWX.
Gary
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