3 rd Annual WRF Users Workshop Promote closer ties between research and operations Develop an advanced mesoscale forecast and assimilation system   Design Priorities: 1-10 km horizontal grids Portable and efficient on parallel computers Advanced data assimilation and model physics Well suited for a broad range of applications Community model with direct path to operations Overall WRF Goals:

WRF Project Collaborators n Signatory Partners: – NCAR Mesoscale and Microscale Meteorology Division – NOAA National Centers for Environmental Prediction – NOAA Forecast Systems Laboratory – Air Force Weather Agency – Federal Aviation Administration – Navy NRL Marine Meteorology Division n Additional Collaborators: – OU Center for the Analysis and Prediction of Storms – Department of Defense HPCMO – NOAA Geophysical Fluid Dynamics Laboratory – NASA GSFC Atmospheric Sciences Division – NOAA National Severe Storms Laboratory – EPA Atmospheric Modeling Division – University Community

WRF Development Teams

24 October 2001 WRF forecast– 12 km Grid (Michalakes, 2001)

24h WRF forecast valid 00Z 25 October 2001 WRF vertically integrated cloud waterSatellite cloud image

25 Oct 18:30 UTC24 Oct 18:30 UTC25 Oct 00 UTC25 Oct 12 UTC26 Oct 00 UTC24 Oct 12 UTC WRF 12 km grid – Coastally Trapped Disturbance

Registered WRF Users (6/21/02) WRF Principal Partners 75 NCAR 33 NCEP 16 FSL 13 OU/CAPS 4 AFWA 9 U.S. Universities 141 U.S. Government Labs 91 Private Sector 78 Foreign Total 727 WRF Web site:

Projected Timeline for WRF Project

24 h Forecast Precipitation, Valid 12Z 12 May km ETA 22 km WRF 10 km WRF 8 km NHM 24 h RFC Analysis

km Cumulus Parameterization Resolved Convection LES PBL Parameterization Two Stream Radiation 3-D Radiation Model Physics in High Resolution NWP Physics “No Man’s Land”

Key Scientific Questions for Storm-Scale NWP n What is the predictability of storm-scale events, and will resolution of fine-scale details enhance or reduce their prediction? n What observations are most critical, and can high-resolution data (e.g. WSR-88D) from national networks be used to initialize NWP models in real time? n What physics is required, and do we understand it well enough for practical application? n How can ensembles be utilized for storm-scale prediction? n What are the most useful verification techniques for storm and mesoscale forecasts? n What networking and computational infrastructures are needed to support high-resolution NWP? n How can useful decision making information be generated from forecast model output?