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PwsFWI: Difference between revisions
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For external reference on the theory behind the pwsFWI you can go the [https://eamcweb3.usfs.msu.edu/HDW/index.html The Hot-Dry-Windy Index: A New FireWeather Index] site of Michigan State University who adopted it as a tool for climatological analysis. The 2018 article on which I based the software is [https://www.mdpi.com/2073-4433/9/7/279 The Hot-Dry-Windy Index: A New Fire Weather Index]. This is an open access article under the [https://creativecommons.org/licenses/by/4.0/ Creative Commons Attribution License].
The userinterface has two formats: ''standard'' and ''beteljuice'' which, you guessed it, has been created by ''beteljuice''.
== Operation ==
[pwsFWI]
Analyse=90
WarningLevel=5 | 6
ResultFormat=beteljuice (the format of the output)
FireImage=true (flames are shown at the end of the scale)
predictionURL=http://api.yourweather.co.uk/index.php?[your API string]
PredictionBackground=Moccasin
CurrentIndexFormat=Standard | Betel-Kocher (the format of the Current value)
CurrentPwsFWI= (this is not a setting but an operational content)
CurrentIndexDay=
== Inner working ==
The inner working is simply running through the daylist from the day where the user chooses to start: minimal 30 or higher if analysis is on. For each day an entry in the pwsFWI list is created and the following values are calculated (see [https://meteo-wagenborgen.nl/wp/2019/08/19/an-effort-for-a-simpler-fire-weather-index/ An effort for a simpler fire weather index]):
#The P<sub>sat</sub> using the August Roch equation
#The Vapor Pressure Deficit
#The dayvalue for the pwsFWI by taking the product of the VPD and the windspeed.
#This pwdFWI fluctuates pretty strong so some smoothing is done when taking rain over the previous five days into account which dampens the fluctuations up and down
The result is the pwsFWI value for that specific day.
With prediction on this can be done up to five days into the future.
The output is then generated with the calculated list.
The value which is used for the user to display - the Current value - can be set to be today or yesterday (default) according to the value of the inifile parameter ''CurrentIndexDay''. Yesterday is the default because that is the last complete and thus known (true) day. Today is still to be measured and therefore is a prediction.
For the output the chosen format is used with a warning level 5 or 6. 5 means a maximum warning level of Extreme (fire danger) and 6 means a maximum warning level of Catastrophic. Catastrophic has been added in Autralia some years ago. The warning levels have been calibrated (non-scientifically) during the first year and were correct according to other systems.
[[Category:CumulusUtils]]
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