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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 - Peravurani Distancia
Pamban 21.9 km
Tiruchirappalli Intl. Airport 51.1 km
Vellore 54.8 km
Cuddalore 73.2 km
Karaikal 75.3 km
Nagapattinam 76.7 km
Puttalam 87.3 km
Mannar 87.6 km
Jaffna 95.5 km
Kadapa 96.3 km
Arogyavaram 101.8 km
Katunayake 101.9 km
Colombo 104.3 km
Colombo 106.4 km
Salem 115.2 km
Madurai 119.9 km
Nellore 123.4 km
Chennai Intl. Airport 125.3 km
Anuradhapura Airport 144.4 km
Galle 144.4 km
Kurunegala 144.8 km
Maha Illuppallama 150.9 km
Vavuniya 151.5 km
Ratnapura 154.7 km
Palayamkottai 161.5 km
Kandy 173.2 km
Bangalore / Hindustan 177.5 km
Bangalore 186.1 km
Nuwara Eliya 189.4 km
Anantapur 198.4 km
Bandarawela 212.8 km
Badulla 219.0 km
Hambantota 232.8 km
Trincomalee 234.2 km
Coimbatore/Peelamedu 236.2 km
Thiruvananthapuram Airport 250.3 km
Ooty 272.1 km
Mysore 278.5 km
Batticaloa 286.0 km
Pottuvil 303.3 km
Alappuzha 306.6 km
Kochi Airport 307.8 km
Chitradurga 317.9 km
Willingdon 322.9 km
Kozhikode 377.3 km
Madikeri 385.5 km

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