Austria Alps 500m AROME case studies for precipitation
To test the 500 m AROME setup for precipitation forecasts, a number of high precipitation cases were chosen. The cases are currently being one by one by Geosphere, the results and possible problems are gathered here.
At the moment, almost all 48 hour runs which are not in June, July, or August, crash at some point with such a message: Crash at step 2212 with Message: Suspicious low temperature : 149.898161213406 At point and location : 12 LAT= 46.8164081937093 LON= 8.96416167935904 At snow level / total layer: 7 / 12 This appears to be connected to the snow scheme, which crashes at very small snow layer thicknesses. This is, apparently, a known problem, and a fix was applied to the code to prevent it from happening:
REAL, PARAMETER :: XSNOWDMIN = 0.000001 ! (m)
However, this does not help. We weill test increasing XSNOWDMIN further, because a snow depth of one hundredth of a mm isn't something that is observed in the real world.
It was also suggested by Aaron Boone to modify ini_surf_csts.F90 by changing
X_RI_MAX = 0.2
to
X_RI_MAX = 0.15 ! or even 0.10
Both of these suggestions are being tested and results will be published here.
