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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 - Lahti Distance
Lahti 0.0 km
Pulkkilanharju Lighthouse 32.5 km
Heinola 51.9 km
Porvoo 57.8 km
Mantsala Hirvihaara 59.7 km
Lammi 66.8 km
Porvoo Kilpilahti 67.2 km
Luhanka Judinsalo 75.4 km
Porvoo Emasalo 76.9 km
Kallbadagrund 98.8 km
Helsinki Airport 98.9 km
Rajamäki 99.7 km
Leivonmäki 104.9 km
Vanhakaupunki 110.6 km
Töölö 113.5 km
Pernaja Orrengrund 114.7 km
Nurmijärvi 118.4 km
Hämeenlinna 127.2 km
Halli Airport 128.0 km
Halli 128.5 km
Anjala 133.8 km
Jyväskylä 143.9 km
Utti 144.9 km
Hattula 146.3 km
Vihti 148.2 km
Rankki 160.0 km
Juupajoki 174.1 km
Kunda (Port) 177.3 km
Kirkkonummi Makiluoto 177.7 km
Kotka Haapasaari 185.5 km
Mikkeli 189.3 km
Lohja 190.9 km
Väike-Maarja Parish 195.3 km
Tallinn 197.8 km
Bagaskar 208.1 km
Viitasaari 213.8 km
Vesanto 216.0 km
Tampere 216.0 km
Türi 217.3 km
Ähtäri 223.3 km
Kuusiku 225.0 km
Kiikala Airport 226.7 km
Virolahti 231.2 km
Tampere 232.7 km
Jokioinen 238.0 km
Pakri 238.4 km
Jõgeva 239.2 km
Vaasa Klemettila 241.4 km
Jõhvi 255.4 km
Mustvee 256.0 km
Tammisaari Jussaro 257.0 km
Viljandi 261.0 km
Alajärvi 263.1 km
Juva 267.0 km
Virrat Aijanneva 270.5 km
Pyhajarvi Ol Ojakyla 277.9 km
Lappeenranta 280.4 km
Halsua Kanala Purola 282.9 km
Maaninka 286.3 km
Lappeenranta 286.8 km
Salo 287.0 km
Nigula 287.2 km
Pärnu Airport 287.7 km
Hanko Tvarminne 288.8 km
Tartu 293.2 km
Kuopio 293.7 km
Rūjiena 310.8 km
Kuopio Ritoniemi 311.6 km
Kuopio 315.8 km
Narva 318.8 km
Haapavesi 319.8 km
Valga 322.0 km
Russarö 322.6 km
Hanko 324.7 km
Ylivieska Airport 325.4 km
Joutseno 326.2 km
Gdov 330.6 km
Toholampi 331.4 km
Vierema Kaarakkala 336.6 km
Virtsu 339.7 km
Ainaži 343.1 km
Rantasalmi Rukkasluoto 343.9 km
Kihnu 345.4 km
Vyborg 346.0 km
Võru 347.5 km
Piikkiö 348.1 km
Seinäjoki 357.9 km
Kauhava 361.6 km
Niinisalo 363.8 km
Kankaanpää 363.9 km
Vaala Pelso 365.3 km
Kingisepp 366.3 km
Kokemäki 366.6 km
Priekuļi 368.3 km
Kärdla Airport 370.9 km
Turku 377.6 km
Ruukki 378.8 km
Savonlinna 381.1 km
Zosēni 385.3 km
Zosēni 385.3 km

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