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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.


Poblíž povětrnostní stanice - Semnán Vzdálenost
Semnán 0.0 km
Dasht-e Naz (Letiště) 75.3 km
Gharakhil 87.2 km
Babolsar 112.7 km
Ghuchan 130.2 km
Esenguly 142.1 km
Gorgán 144.3 km
Shahrud 192.1 km
Nowshahr 210.5 km
Khur 221.4 km
Letiště Teherán-Mehrabád 226.5 km
Nowshahr (Letiště) 226.5 km
Kashan 240.1 km
Teherán Letiště 248.5 km
Jazd 264.8 km
Jazd 264.8 km
Isfahán 279.2 km
Ábáde 303.0 km
Rámsar 316.2 km
Maraveh Tappeh 323.3 km
Bereket 337.2 km
Šahr-e Kord 357.5 km
Kazvín 379.7 km
Kisyl-Arwat 390.6 km
Tabas 412.4 km
Arák 422.1 km
Rašt 432.8 km
Aligudarz 437.9 km
Bandar-e Anzali 455.8 km
Bodžnúrd 456.1 km
Sabzevar 478.7 km
Bäherden 484.5 km
Masjed Soleyman 521.0 km

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