On the programming of CumulusUtils

  • HansR 

Introduction

Having developed theoretically a Fire Weather Index (see my pwsFWI) and creating a first implementation of it in C for analytical purposes, I needed to take the software a bit further to make it more robust and useful. I had some feedback which made me realize it was urgent to have a good Fire Weather Index (FWI) for Personal Weather Stations (PWSs).

This blog is about the context and the actual programming requirements.

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Evaluating FWI for Personal Weather Station

  • HansR 

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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The Canadian FWI

  • HansR 

Introduction

I will describe the Canadian FWI as it appears in (scientific) literature. The basic reason for describing this complex fire-weather index is, that it is heavily used in some big countries, notably Canada, France, Australia and New Zealand and that the description of the method of calculation is not readily available.

The FWI also has been introduced in 2007 [1] as the method to assess the fire danger level in a harmonized way throughout Europe.  

Some extensive studies have been made, to measure its performance and its relevance. FWI also contains most parameters relevant to estimating the danger level of the weather in relation to nature fires. In short: the FWI is an important tool for estimating and studying fire weather and fire spreading, with a huge knowledge base spanning almost 100 years.Read More »The Canadian FWI

Another top10 approach

  • HansR 

An example for this top10 approach you will find on the weather site.

As a variation to existing top10 lists, I wrote a small program (in C) which reads dayfile.txt from Cumulus once per day just after midnight and for selected measurements it creates a sorted top10-list. From that list it creates a HTML-table and writes that to a text-file. That file can be included by the user on a website wherever he wants simply by a PHP-include (which is the easy way to include I think).

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PWS – Calibrations: UT330C

  • HansR 

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:Read More »PWS – Calibrations: UT330C

PWS – Calibrations

  • HansR 

The Davis Vantage PRO 2+, the hardware which forms the basis of the PWS De Wilgen is not a measurement device without flaws. As any measuring device – a thermometer, hygrometer etc… – it requires calibration and a calibration needs to be checked regularly. I use two types of calibration.

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