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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 - Williston Απόσταση
Fraserburg Airport 89.0 km
Brandvlei 103.9 km
Sutherland 111.1 km
Calvinia Airport 128.6 km
Vanwyksvlei 144.2 km
Laingsburg 192.5 km
Nieuwoudtville 203.4 km
Beaufort West 209.2 km
Prince Albert 226.0 km
Ladismith 226.9 km
Excelsior Ceres 236.1 km
Clanwilliam 241.8 km
Porterville 257.3 km
Prieska 266.7 km
Vredendal Airport 271.1 km
Robertson 279.5 km
Riversdale 286.3 km
Worcester 286.6 km
Worcester 286.6 km
Pofadder 287.7 km
Augrabies Falls 293.2 km
Lambert's Bay 296.4 km
Άπινγκτον Αεροδρόμιο 307.1 km
Riviersonderend 313.1 km
Stilbaai 317.5 km
George Airport 320.6 km
Mossel Bay Airport 323.9 km
Παρλ 329.3 km
Malmesbury 330.3 km
Vyeboom 344.1 km
Willowmore 349.8 km
Langebaanweg Airport 350.0 km
De Aar 350.7 km
Geelbek 367.2 km
Knysna 368.5 km
Langebaan 370.5 km
Struisbaai 372.0 km
Strand 372.6 km
Hermanus 373.8 km
Cape Columbine 375.2 km
Cape Town International Airport 376.4 km
Ακρωτήριο Αγκούλιας 376.8 km
Air Force Base Ysterplaat 379.2 km
Springbok Airport 379.5 km
Νήσος Ρόμπεν 382.8 km
Table Bay 384.5 km
Molteno Reservior 389.1 km
Plettenberg Bay 390.1 km
Postmasburg 392.7 km
Slangkop 412.3 km
Cape Point 413.8 km
Graaff-Reinet 413.8 km
Joubertina 416.1 km
Koingnaas 422.2 km
Tsitsikamma National Park 431.9 km
Kathu 445.4 km
Noupoort 449.3 km
Vioolsdrif 462.4 km
Kuruman 492.3 km
Patensie 499.9 km
Κίμπερλεϊ Αεροδρόμιο 502.1 km
Port Nolloth 502.9 km
St Francis Bay 524.9 km
Alexander Bay 569.3 km
Taung 579.3 km
Taung 579.3 km