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What are the sources for WeatherOnline forecasts?


The WeatherOnline forecasts are created by using a MOS system developed in-house with the most current US weather services model data (GFS). The statistical methods of the Model-Output-Statistic (MOS)-System were developed in cooperation with the Meteorological Department of the University of Bonn.

What is a MOS-System?


A Model-Output-Statistic (MOS)-System combines the data of the weather forecast model and the locally recorded data for any given point by transforming the model data from a coarse grid to detailed small scale areas.
In order to do so, one needs a large volume of past model forecast data as well as the corresponding recorded data for any given location. The MOS-System relates these two sets of data in an optimized fashion allowing development of the local weather forecast by using the most current model forecast.

What are the time intervals used in the temperature and icons of the local forecasts?


The forecasted maximum temperature always refers to a 12hour window from 6am to 6om local time.
The forecasted minimum temperature always refers to the 12hour window from 6pm of the day before the forecast day to 6 am of the forecast day.
The weather icon for the morning refers to the time between 6am and 12pm local time, the icon for the afternoon is valid from 12am to 6pm local time and the evening icon refers to the time from 6pm to 12am local time.

How often are the current weather conditions and forecasts updated?


The current weather information as well as the satellite images are updated every 30 minutes whereas the radar images are being updated every 15 minutes.
The local weather forecasts as well as the weather charts are updated 8 times a day. The updates start at 2 am CEST or 3 am CEST depending on daylight saving time and continue on a three hourly bases.


Nearby Weather Stations - Siena Distance
Florence/Peretola 54.3 km
Arezzo 61.6 km
Radicofani 67.6 km
Grosseto 67.9 km
Monte Argentario 102.8 km
Pisa 111.4 km
Monte Cimone 117.9 km
Monte Calamita 120.3 km
Calamita 122.4 km
Viterbo 126.2 km
Forlì 127.4 km
Bologna/Borgo 132.8 km
Perugia 134.2 km
Cervia 148.1 km
Civitavecchia 151.3 km
Frontone 158.6 km
Rimini 163.3 km
Point Marina/Ravenna 165.0 km
Vigna Di Valle 167.6 km
Ferrara 168.8 km
Sarzana/Luni 170.5 km
Fiumicino Airport 194.5 km
Rieti 196.3 km
Rome/Urbe 198.5 km
Parma 200.3 km
Monte Terminillo 207.3 km
Guidonia Montecelio 213.1 km
Ciampino 218.6 km
Cap Corse 218.8 km
Pratica di Mare 220.0 km
Bastia - Poretta Airport 220.5 km
Alistro 229.4 km
Ancona/Falconara 230.5 km
Villafranca 231.6 km
Padua Airport 234.3 km
Piacenza 248.5 km
Brescia Airport 255.7 km
Ghedi Air Base 259.1 km
Latina 260.8 km
Solenzara 262.7 km
Venice Marco Polo Airport 263.4 km
Treviso 272.0 km
Istrana 272.3 km
L'Île-Rousse 277.5 km
Frosinone 286.8 km
Calvi/St Catherine 294.0 km
Genova/Sestri 299.9 km
Giovi Pass 302.0 km
Paganella 311.0 km
Orio al Serio Intl. Airport 314.3 km
Figari 317.2 km
Ponza 318.2 km
Ajaccio Napoleon Bonaparte Airport 318.7 km
Capo Pertusato 319.4 km
Linate Airport 327.8 km
Aviano Airport 328.2 km
Rolle 329.5 km
Olbia 331.9 km
Pescara 335.0 km
San Giovanni Teatino 336.7 km
Pula Airport 337.9 km
Bolzano 343.1 km
Portorož 346.3 km
Portorož Airport 347.2 km
Codroipo 347.7 km
Capo Mele 357.5 km
Pazin 359.6 km
Kraftwerk Robbia 359.7 km
Ronchi Legionari 363.4 km
Albenga 364.1 km
Bernina 367.8 km
Trieste 371.0 km
Santa Maria Val Müstair 372.6 km
Mali Lošinj 374.7 km
Piz Corvatsch 378.1 km
Novara / Cameri 381.0 km
City 381.2 km
Vicosoprano 381.9 km
Sils im Engadin/Segl 382.4 km
Buffalora 382.6 km
Monte Generoso 383.8 km
Milan Malpensa Airport 383.9 km
Toblach Airport 385.3 km
Samedan Airport 386.4 km
St. Valentin auf der Haide 386.5 km
Gurgl 389.1 km
Sterzing 389.5 km
Stabio 390.2 km
Grazzanise 392.8 km
Sillian 393.4 km
Brunnenkogel 396.1 km
Scuol 397.2 km
Mittelbergferner 397.4 km
Lugano Airport 398.2 km
Naluns / Schlivera 400.4 km
Grono 401.3 km
Monte Malanotte 404.7 km
Mondovì 406.8 km
Piz Martegnas 408.7 km
Kötschach 410.8 km