Camera Assimilation DA testing with GSI/GSD cloud/hydrometeor analysis Using GSI with all-sky forward model for HRRR assimilation Cloud mask, image correlation, or spectral radiances from camera Sky image derived from GSI first guess

Camera Assimilation (cont’d) Camera image with additional cloud structure GSI analysis strategy Cloud mask for hydrometeor subtraction (non-var) Cloud mask or image correlation term for variational cost function (can also add hydrometeors) Cloud / Clear mask for hydrometeor subtraction

Status Colorado GSI domain test March 30, 2017 test case Camera cloud mask image read into GSI (gsdcloudanalysis) First guess hydrometeor field produces simulated image Cloud mask is used to zero out hydrometeors in camera locations defined as clear

Difference Plan view Colorado GSI domain test March 30, 2017 test case Camera cloud mask image read into GSI (gsdcloudanalysis) First guess hydrometeor field produces simulated image Cloud mask is used to zero out hydrometeors in camera locations defined as clear

Comparison X-sect Colorado GSI domain test March 30, 2017 test case Camera cloud mask image read into GSI (gsdcloudanalysis) First guess hydrometeor field produces simulated image Cloud mask is used to zero out hydrometeors in camera locations defined as clear

Clearing Step Impact – (before) DA testing with GSI/GSD cloud/hydrometeor analysis Using GSI with all-sky forward model for HRRR assimilation Cloud mask, image correlation, or spectral radiances from camera Subset of grid cells cleared along line of sight More Complete Clearing

Clearing Step Impact – (after) DA testing with GSI/GSD cloud/hydrometeor analysis Using GSI with all-sky forward model for HRRR assimilation Cloud mask, image correlation, or spectral radiances from camera Subset of grid cells cleared along line of sight More Complete Clearing

Clearing Step Impact DA testing with GSI/GSD cloud/hydrometeor analysis Using GSI with all-sky forward model for HRRR assimilation Cloud mask, image correlation, or spectral radiances from camera Subset of interpolated grid cells cleared along line of sight More Complete Clearing

Clearing Step Impact DA testing with GSI/GSD cloud/hydrometeor analysis Using GSI with all-sky forward model for HRRR assimilation Cloud mask, image correlation, or spectral radiances from camera Colors in simulated image denote type of grid points. Green - no cloud & no clearing. Yellow - no clearing of gridpoint having cloud. Magenta – clearing of gridpoint having cloud. Orange – clearing of gridpoint having no cloud. Subset of grid cells cleared along line of sight More Complete Clearing

Clearing Step Impact DA testing with GSI/GSD cloud/hydrometeor analysis Using GSI with all-sky forward model for HRRR assimilation Cloud mask, image correlation, or spectral radiances from camera Yellow shade varies with hydrometeor density As before, except with green points removed. Shades of yellow denote varying amount of hydrometeors at each grid point. Subset of grid cells cleared along line of sight More Complete Clearing

Clearing Step Impact DA testing with GSI/GSD cloud/hydrometeor analysis Using GSI with all-sky forward model for HRRR assimilation Cloud mask, image correlation, or spectral radiances from camera Potential Cloud Addition As before except green indicates gridpoints having potential cloud addition according to the cloud mask. Subset of grid cells cleared along line of sight More Complete Clearing

Status Next steps Convert from Hydrometeor Mixing Ratio to Content (kg/m^3) Test cloud addition (with variational techniques) On to Alaska - test access of a couple of FAA Avcams

Distance to Terrain (km) Visibility 0.1 1 10 100 Distance to Terrain (km) Possibly help augment LL edge detection algorithms.

Ceiling is low obscuring the terrain with simulated clouds Visibility Clear Sky Low Clouds Ceiling is low obscuring the terrain with simulated clouds