Model:

GFS (Global Forecast System) Global Model from the "National Centers for Environmental Prediction" (NCEP)

Ververst:
4 times per day, from 3:30, 09:30, 15:30 and 21:30 UTC
Greenwich Mean Time:
12:00 UTC = 13:00 MET
Resolutie:
0.5° x 0.5° for forecast time <= 384 hrs
Parameter:
Gemiddelde relatieve luchtvochtigheid tussen 0 en ca. 300 m boven grondniveau
Beschrijving:
Deze kaart spreekt voor zich. De kaart is minder belangrijk dan de vochtkaarten voor 925 en 700 hPa, maar geeft wel goede aanknopingspunten voor vlakke vochtverdelingen en temperatuurinversies.
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).