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With the models under some degree of scrutiny I always forget which has higher resolution here and there and at what time frames. After some digging around put this together and hope it is some use as a point of reference, this is not my area of expertise so please edit, add to, correct, grow etc etc Data for numerical weather prediction is provided by observations from satellites, from the ground (both human and from automatic weather stations), from buoys at sea, radar, radiosonde weather baloons,, wind profilers, commercial aircraft and a background field from previous model runs. The gist of this is shown by this handy pic from a non-blacked out Wikipedia and ensembles depicted from UKMO website. UKMO Unified Model - Global Model 25Km Resolution 70 Vertical Levels 144 Hours UKMO North Atlantic and European Model NAE 12Km Resolution 70 Vertical Levels 48 Hours UKMO - Other 1.5km Resolution UK 70 Vertical Levels 36 Hours 4Km Resolution Surrounding Areas ã€€ ã€€ ECM / IFS 16 /31km? unsure.. Operational / Deterministic run is Twice Hortizontal Resolution of Ensembles 240 Hours Operational 60 Vertical Levels Ensembles 40 Vertical Levels 51 member Ensemble suite http://www.ecmwf.int...techniques.html ã€€ GFS 35 km / 64 vertical layers High Resolution runs to 192 Hours / 7 days - every 3 hrs 70 km / 64 vertical layers Lower Resolution runs from 192 - 384 Hrs - every 12th hr 22 Ensemble Suite 9 including Control / Operational GEFS using current operational GFS -increase in horizontal resolution from 70 km to 55 km (T254) for 0-192 h, and 70 km (T190) for 192-394 hours -increase in vertical resolution from 28 to 42 layers for 0-384 hours http://www.emc.ncep..../GEFS/mconf.php