Hoogte/Temp. 850 hPa NAM Model

Model:

Ververst:

4 times per day, from 0:00, 06:00, 12:00 and 18:00 UTC

Greenwich Mean Time:

12:00 UTC = 13:00 MET

Resolutie:

32km

Parameter:

Geopotentiaal op 850 hPa (doorgetrokken lijn) en Temperatuur op 850 hPa(gekleurd, stippellijn)

Beschrijving:

Deze kaart geeft door samengedrukte isothermen meestal duidelijk de positie van fronten aan. Daarnaast is de 850-temperatuur (ca. 1500m boven zeeniveau) een belangrijke maat voor de verwachte maximumtemperatuur aan de grond (2m). In veel wintersituaties (vaak bij rustig weer) is dit verband er niet.

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).