1. Modeling Group
Onvlee, Dudhia, Auger, Cober, Lean, Alexander, Milbrandt, Steiner, Brown

2. Questions
Identify specific development/improvement efforts that the NWP community can make to improve the performance of NWP in the nowcasting range
New ideas and techniques to improve/optimize the direct/indirect use of NWP for nowcasting.
Suggestions for international collaboration in experimentation concerning the NWP use in nowcasting

3. Not just convection: stable BL
Identify specific development/improvement efforts that the NWP community can make to improve the performance of NWP in the nowcasting range
Not just convection: stable BL
Sensitivity to PBL schemes as much asmicrophysics
PBL depth, water vapor, vertical structure, grey zone (< 1 km)
Surface initialization: snow, physiographic data, complex terrain resolution
Downscaling/post-processing products (terrain, fog)
Verifying
PBL/turbulence in grey zone

4. Short-range physics effects? PBL development of turbulence
Microphysics, aerosol, double-moment, tuning
Shallow cumulus even at cloud-permitting scale (cloud-top PBL)
High-frequency radiation calls (for cloud motion)
Cloud initialization uncertainty
Surface uncertainty (hi-res analysis can be used)

5. Education and training in use of models datasets at high resolution
Use of ensembles (deterministic v ensemble resolution) in nowcasting – how?
Uncertainties (analysis, LBC, model physics, cloud analysis, surface)
Education and training in use of models datasets at high resolution
Next generation of computers changes physics problems to be addressed

6. Field programs (PBL, shallow cu, precipitation, process understanding)
Suggestions for international collaboration in experimentation concerning the NWP use in nowcasting
Field programs (PBL, shallow cu, precipitation, process understanding)
Modelers need to be involved
(FDPs, RDPs)
Shallow cumulus
Convective initiation (UK, Canada)
HYMEX (hydrology cycle)
FROST14 (winter weather, Russia)