Model:

Ververst:

4 times per day, from 08:00, 14:00, 20:00, and 00:00 UTC

Greenwich Mean Time:

12:00 UTC = 13:00 MET

Resolutie:

0.068025° x 0.068025°

Parameter:

Relatieve Luchtvochtigheid op 850 hPa

Beschrijving:

Deze kaart laat de berekende relatieve luchtvochtigheid zien op 850 hPa. Globaal gezegd stijgt lucht op aan de voorkant van troggen en bij fronten. De opstijgende lucht koelt af. Daarbij neemt de relatieve luchtvochtigheid toe. Op een gegeven moment condenseert er vocht en ontstaat er wolkenvorming. Hoge vochtwaardes op 850 hPa - dat is op ca. 1500 m boven zeeniveau - hangen meestal samen met stijgings- en neerslag-actieve gebieden.

FMI:

At the Finnish Meteorological Institute, results from several numerical weather prediction models are utilized. Most of all, these include products from the European Centre of Medium Range Forecasts (ECMWF), located in Reading in the United Kingdom. For shorter range forecasts, more detailed forecasts are produced in-house using a limited area models (LAMs) called HIRLAM and HARMONIE, which are being developed by FMI as an international co-operation programme with a number of European countries.

NWP:

Numerical weather prediction uses current weather conditions as input into mathematical models of the atmosphere to predict the weather. Although the first efforts to accomplish this were done in the 1920s, it wasn't until the advent of the computer and computer simulation that it was feasible to do in real-time. Manipulating the huge datasets and performing the complex calculations necessary to do this on a resolution fine enough to make the results useful requires the use of some of the most powerful supercomputers in the world. A number of forecast models, both global and regional in scale, are run to help create forecasts for nations worldwide. Use of model ensemble forecasts helps to define the forecast uncertainty and extend weather forecasting farther into the future than would otherwise be possible.

Wikipedia, Numerical weather prediction, http://en.wikipedia.org/wiki/Numerical_weather_prediction(as of Feb. 9, 2010, 20:50 UTC).