Ensemble Prediction

Weather is unpredictable. Small differences in initial conditions can develop into big differences in the pattern of circulation, in the timing and location of cyclones, rainfall etc. This is true no matter how good the initial observing system is. The approach taken by organisations such as ECMWF or NCEP is to re-run numerical forecast models [...]

February 2, 2010 · joe · 11 Comments
Tags: ,  · Posted in: Climate

Visualizing the jet stream

Jet streams are narrow tubes of strong westerly winds which circle the earth at ≈ 10km elevation. These strong winds separate regions of cold and warm air. Surface weather at mid-latitudes is affected by the chaotic meanderings of jet streams. The above wind speed maps are based on NCEP GFS analysis at 300mb pressure level (equivalent [...]

January 14, 2010 · joe · No Comments
Tags:  · Posted in: Climate