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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.


Stazioni meteo nelle vicinanze - Portici Distanza
Napoli/Capodichino 8.7 km
Isola di Capri 32.4 km
Grazzanise 38.9 km
Aeroporto di Salerno-Costa d'Amalfi 67.7 km
Campobasso 88.2 km
Trevico 103.3 km
Frosinone 145.0 km
Termoli 147.5 km
Aeroporto di Foggia 149.3 km
Isola di Ponza 154.4 km
Amendola 172.2 km
San Giovanni Teatino 173.4 km
Pescara 175.0 km
Latina 178.2 km
Latronico 203.3 km
Monte Sant'Angelo 203.7 km
Bonifati 218.2 km
Guidonia Montecelio 219.4 km
Ciampino 221.1 km
Pratica di Mare 230.0 km
Monte Terminillo 233.3 km
Vieste 234.1 km
Roma/Urbe 238.3 km
Rieti 240.0 km
Aeroporto di Roma-Fiumicino 256.3 km
Ustica 261.9 km
Pelagosa 271.7 km
Vigna Di Valle 273.0 km
Bari/Palese Macchie 274.8 km
Monte Scuro 279.8 km
Marina di Ginosa 287.3 km
Gioia del Colle 289.5 km
Lamezia Terme 296.4 km
Civitavecchia 308.0 km
Viterbo 308.7 km
Comisa 309.2 km
Messina 312.3 km
Aeroporto di Palermo-Punta Raisi 317.3 km
Perugia 319.2 km
Ancona/Falconara 321.2 km
Reggio Calabria 330.0 km
Frontone 342.6 km
Grottaglie 342.9 km
Lesina 345.1 km
Prizzi 349.2 km
Enna 350.6 km
Lagosta 354.2 km
Sebenico 359.6 km
Crotone 361.2 km
Radicofani 364.2 km
Aeroporto di Spalato-Castelli 365.3 km
Catania/Fontanarosa 369.4 km
Zara 369.6 km
Marjan 371.1 km
Aeroporto di Zara-Zemonico 371.7 km
Base aerea di Sigonella 373.7 km
Aeroporto di Trapani-Birgi 375.2 km
Sciacca 381.6 km
Monte Argentario 391.3 km
Rimini 396.2 km
Arezzo 398.7 km
Macarsca 399.4 km
Lussinpiccolo 401.0 km
Gela 403.0 km
Brindisi/Casale 403.0 km
Gospić 417.8 km
Grosseto 419.9 km
Porto Tolero 420.3 km
Neum 427.5 km
Arbe 427.6 km
Lecce 429.4 km
Cervia 432.5 km
Zavizan 436.8 km
Livno 440.2 km
Aeroporto di Pola 442.7 km
Forlì 445.1 km
Segna 453.2 km
Cozzo Spadaro 453.8 km
Ravenna/Punta Marina 454.0 km
Santa Maria di Leuca 459.0 km
Ragusa 461.1 km
Bihać 463.2 km
Mostar 471.5 km
Firenze/Peretola 476.0 km
Aeroporto di Ragusa-Čilipi 476.3 km
Monte Calamita 484.9 km
Monte Calamita 486.8 km
Bugojno 492.6 km
Sanski Most 498.9 km
Jajce 499.8 km
Pantelleria 507.3 km
Teodo 518.1 km
Ivan Sedlo 518.7 km
Bologna/Borgo Panigale 526.0 km
Ferrara 530.3 km
Banja Luka 532.5 km
Bjelašnica 536.4 km
Zenica 538.3 km
Zenica 538.3 km
Pisa 539.0 km