recalculating heatindex ?

[Tim Tuck]

Hi all,

Is there a way to recalculate heatindex ?

I've just installed the Belchertown skin and I'm looking at the graphs and I see that heatindex was incorrectly calculated i.e. windchill and heatindex appear to be swapped.

Checking my weewx.conf I found that I had set heatindex to hardware_preferred when it should have been software so I think that may have contributed to the problem since I originally had h/w that did that but it failed and I swapped to the Ecowitt which doesn't.

Here is a graph of the data I want to fix...

cheers

Tim

[Susan Mackay]

Not sure if this is what you are after but:

http://www.bom.gov.au/info/thermal_stress/?cid=003bl08

Towards the bottom it gives the formula for 'apparent temperature' (which the article states is called 'heat index' in the US).

Susan

[gjr80]

Hi,

If it is indeed the heatindex data that is incorrect you should be able to use the new --calc-missing action in the wee_database utility to be released with WeeWX v4 to re-calculate your heatindex data. That is of course provided the obs used to calculate heatindex (outTemp and outHumidity) are in fact correct. It would require a little SQL to first set heatindex to None/null in the archive table for the period over which you wish to re-calculate heatindex (--calc-missing only calculates derived observations (eg heatindex) if they are missing, hence the set to None/null) and then just use wee_database --calc-missing.

Gary