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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 - Grabouw Απόσταση
Strand 16.7 km
Vyeboom 19.7 km
Hermanus 38.3 km
Παρλ 45.8 km
Cape Town International Airport 48.5 km
Cape Point 59.5 km
Air Force Base Ysterplaat 61.6 km
Table Bay 68.4 km
Molteno Reservior 69.3 km
Slangkop 76.1 km
Worcester 76.4 km
Worcester 76.4 km
Malmesbury 78.6 km
Νήσος Ρόμπεν 79.6 km
Riviersonderend 100.4 km
Robertson 106.7 km
Excelsior Ceres 133.7 km
Ακρωτήριο Αγκούλιας 134.0 km
Struisbaai 136.9 km
Geelbek 140.4 km
Langebaanweg Airport 155.5 km
Langebaan 157.0 km
Cape Columbine 189.0 km
Clanwilliam 208.1 km
Laingsburg 230.4 km
Lambert's Bay 235.2 km
Riversdale 250.6 km
Sutherland 262.0 km
Ladismith 262.3 km
Stilbaai 266.3 km
Vredendal Airport 267.6 km
Calvinia Airport 294.4 km
Nieuwoudtville 295.4 km
Prince Albert 350.6 km
Mossel Bay Airport 350.7 km
Fraserburg Airport 364.5 km
George Airport 376.9 km
Brandvlei 419.7 km
Porterville 435.5 km
Beaufort West 437.3 km
Knysna 454.7 km
Koingnaas 459.5 km
Plettenberg Bay 481.9 km
Vanwyksvlei 505.4 km
Willowmore 508.9 km
Joubertina 542.7 km
Tsitsikamma National Park 545.6 km