Tag Archives: calibration

Analysis of pwsFWI prediction

Introduction

In my previous blog I described why and how the predictions on pwsFWI were implemented. Also I promised a short analysis:

We’re now in version 1.8.3 and it seems all to be working OK. The testing is back on the meteorological level, trying to find out how much a two day ahead prediction will differ from the actual calculation when the day has past.

In this blog I will show the results and try to interpret them.
Please note that this is not a scientific or even a full analysis as I am lacking the resources and the data for that.

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Evaluating FWI for Personal Weather Station

In An effort for a Simpler Fire Weather Index I described my new FWI and the theory behind it. In short, this pwsFWI (as I have baptised it) is meant to be a generic FWI, valid everywhere and independent of geology and vegetation.

The pwsFWI is a (not too) complex measure of local meteorology, an indicator composed of humidity, wind speed and temperature. It fluctuates under ‘normal’ conditions and if it becomes dryer (a longer period without rain, the number becomes higher. As soon as it starts raining, the value starts dropping.

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PWS – Calibrations: UT330C

For amateur meteorologists it is not always easy to calibrate their equipment, unless you yourself are working at a meteorological service or know people who do, it can be difficult to get the readouts correct within the limits of error of the weather station. I described this already a short time ago.

The UT330C

So now I have this new UT330C. I bought it in China and it arrived pretty fast (11 days). It measures temperature, humidity and pressure within reasonable error limits: Continue reading