Global Forecast System (GFS) Model Previous called the Aviation (AVN) and Medium Range Forecast (MRF) models. Global model and 64 levels Relatively primitive.

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Global Forecast System (GFS) Model Previous called the Aviation (AVN) and Medium Range Forecast (MRF) models. Global model and 64 levels Relatively primitive microphysics. Sophisticated surface physics and radiation Run four times a day to 384 hr. Major increase in skill during past five years derived from using direct satellite radiance in the 3DVAR analysis scheme. T382 (~35 km) over the first 180 hours (7.5 days) of the model forecast and T190 (70 km) for 180 through 384 hours--major implications for resolution change!

GFS Just changed vertical coordinates from sigma to hybrid sigma/pressure… sigma at low levels to pressure aloft.

Vertical coordinate comparison across North America

GFS Data Assimilation Has a later data cut-off time than the mesoscale models…and thus can get a higher percentage of data. Uses much more satellite assets..thus improve global analysis and forecasts. Major gains in southern hemisphere Based on 3DVAR

Skill Improvements (ECMWF) Useful skill until: day day day 8

Rapid Update Cycle-RUC

RUC A major issue is how to assimilate and use the rapidly increasing array of offtime or continuous observations (not a 00 and 12 UTC world anymore! Want very good analyses and very good short- term forecasts (1-3-6 hr) The RUC ingests and assimilates data hourly, and then makes short-term forecasts Uses the MAPS mesoscale model…which uses a hybrid sigma/isentropic vertical coordinate Resolution: 13 km and 50 levels

13km RUC Improvements expected from 13km RUC - Improved near-surface forecasts - Improved precipitation forecasts - Better cloud/icing depiction - Improved frontal/turbulence forecasts Terrain elevation m interval NCEP computer upgrade allows RUC13 to run in same time as current RUC20

Observations used in RUC Data Type ~Number Freq Rawinsonde 80 /12h NOAA profilers 30 / 1h VAD winds / 1h Aircraft (V,temp) / 1h Surface/METAR / 1h Buoy/ship / 1h GOES precip water / 1h GOES cloud winds / 1h GOES cloud-top pres 10 km res / 1h SSM/I precip water / 6h GPS precip water ~300 / 1h Mesonet ~5000 / 1h METAR-cloud-vis-wx ~1500 / 1h NCEP RUC20 operational RUC13 (at NCEP June 2005) Cloud analysis variables

RUC History – NCEP (NMC) implementations First operational implementation of RUC - 60km resolution, 3-h cycle 1998 – 40km resolution, 1-h cycle, - cloud physics, land-sfc model 2002 – 20km resolution - addition of GOES cloud data in assimilation 2003 – Change to 3dVAR analysis from previous OI (April) 2004 – Vertical advection, land use (April) PBL-depth for surface assimilation (September) 2005 – 13km resolution, new obs, new model physics (June) 2007 – WRF-based Rapid Refresh w/ GSI to replace RUC

More detailed coastline with 13km resolution 13km RUC20km RUC Soil moisture – 22z - 21 Feb 2005 Dark blue = water

WRF RUC A new version of RUC has been developed, but not yet operational that uses the WRF model instead of the MAPS model.