[R] Classification of wind events

[Stefano Sofia]

Dear R list users,
I am aware that this question is not strictly related, at the present moment, to R code and it is more general. Please forgive me, but I need to share my thoughts with you.

Foehn conditions on the southern slope of Alps happen with strong northerly flows that impact perpendicularly over the Apls. This situation triggers strong northerly leeward winds.
Given a single automatic weather station, I would like to identify these periods starting from wind direction and wind intensity data. Frequency of data is quarter of hour.
I would really find difficult to detect the moving windows of these events:
- I can't analyse data day by day;
- at the beginning and at the end of each event, when the process is not at full speed yet, the rotation is not always perfectly identifiable;
- I cannot claim in principle that the direction of each consecutive observation is costantly and strictly from the chosen direction.

Does anybody have a clue on how to start to build this process in the right way?

Thank you for your attention and your help
Stefano

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Stefano Sofia PhD
Civil Protection - Marche Region
Meteo Section
Snow Section
Via del Colle Ameno 5
60126 Torrette di Ancona, Ancona
Uff: 071 806 7743
E-mail: stefano.sofia using regione.marche.it
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