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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.


Estaciones meteorológicas cercanas - Sivaganga Distancia
Tiruchirappalli aeropuerto 34.2 km
Madurai 41.6 km
Salem 52.3 km
Arogyavaram 81.6 km
Palayamkottai 83.9 km
Pamban 84.4 km
Vellore 100.6 km
Bangalore / Hindustan 114.2 km
Bangalore 121.6 km
Cuddalore 150.1 km
Karaikal 153.7 km
Nagapattinam 155.1 km
Puttalam 156.9 km
Coimbatore/Peelamedu 160.1 km
Mannar 162.5 km
Katunayake 167.5 km
Colombo 168.2 km
Colombo 170.1 km
Thiruvananthapuram Aeropuerto 172.0 km
Jaffna 172.6 km
Udhagamandalam 196.4 km
Chennai aeropuerto 201.7 km
Mysore 205.1 km
Galle 210.1 km
Kurunegala 217.1 km
Anuradhapura Aeropuerto 219.3 km
Ratnapura 224.7 km
Maha Illuppallama 225.4 km
Vavuniya 227.5 km
Alappuzha 228.3 km
Cochín Aeropuerto 229.9 km
Isla Willingdon 244.9 km
Kandy 246.5 km
Nuwara Eliya 262.5 km
Bandarawela 286.5 km
Badulla 293.1 km
Kozhikode 300.7 km
Hambantota 305.8 km
Madikeri 310.7 km
Trincomalee 310.8 km
Batticaloa 362.2 km
Pottuvil 378.9 km
Mangalore/Bajpe 406.4 km