HansR

Analysis of pwsFWI prediction

  • HansR 

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.

Read More »Analysis of pwsFWI prediction

Predictions of pwsFWI

  • HansR 

Introduction

The past months I blogged several times about my Fire Weather Index for personal weather stations on the basis of Cumulus as data acquisition software. So if you’re new here and don’t know what pwsFWI is about, check out the previous blogs on the subject. Currently, pwsFWI is part of a small software package named CumulusUtils. This meteo website/blog is the home of the package which is distributed through the Cumulus support forum. If you have a weather station which can cooperate with Cumulus, don’t hesitate and get it, it’s free.

Read More »Predictions of pwsFWI

Winter is coming

  • HansR 

Last night Daylight Saving Time switched back to its winter position. That itself is nothing special. Well, maybe it is because the EU is really thinking of abandoning the twice per year hour shift, it is biologically deregulating.

But that is not why I write this [short] message. The switch itself showed up nicely on the temperature graph of my weather station and, as if it was saying Winter is Coming, exactly on the time of the hour switch, the temperature fell from 15 to 10 degrees within an hour and a half.

It shows all nicely on the chart (after the break). Read More »Winter is coming

Summer is over

  • HansR 

You know it is coming, the end of summer, but where I live it usually comes slowly and somewhere end of October you know it is gone. Not this year. This year it was in an instant, well, we may have some nice weather in October of course, but the end was there. And I will show you with some graphs.

Read More »Summer is over

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.

Read More »On the programming of CumulusUtils

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.

Read More »Evaluating FWI for Personal Weather Station