Ensemble collapse and NaN values during Croton test case DA by HydroDART

[Fatemeh Shirkhanloo]

Dear WRF-Hydro Community,

I am running the standalone version of WRF-Hydro coupled with DART (HydroDART) for the Croton test case to perform Data Assimilation from 2011-08-26 to 2011-09-01.

As you can see in the attached graph, my data assimilation cycle is failing after 2011-08-29, exactly after the hurricane event. As a result, in my output file (preassim_sd_d01.2011082705.nc and analysis_sd_d01.2011083000.nc), I am seeing NaN values for qlink1 variable. This indicates that something is corrupting the model, which causes the ensemble spread to collapse to zero in subsequent cycles.

Any help or assistance on how to resolve this would be greatly appreciated.

Thank you,

Fatemeh