模式:

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

更新:
4 times per day, from 3:30, 09:30, 15:30 and 21:30 UTC
格林尼治平时:
12:00 UTC = 20:00 北京时间
Resolution:
0.5° x 0.5° for forecast time <= 384 hrs
参量:
RH 0-300:
地面以上0到300米之间的平均相对湿度
描述:
这幅图显示地面以上0到300米之间大气层的平均相对湿度。 虽然这幅图不如925或700百帕等压面相对湿度图那样重要 ,但是它能反映 极浅薄的湿度逆转,从而也反映逆温。

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://zh.wikipedia.org/wiki/數值天氣預報(as of Feb. 9, 2010, 20:50 UTC).