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Discrepancies in Forecasts between 00z and 12z runs in WRF 4km model
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Discrepancies in Forecasts between 00z and 12z runs in WRF 4km model 3 weeks 2 days ago #961

  • ameerrh
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Hi,
I am writing to bring to your attention an ongoing issue with the WRF 4 km model that has been observed over a prolonged period, specifically with discrepancies between the 00z and 12z runs. The 12z run is forecasting no precipitation in the coming days, whereas the 00z run predicts rain.
Additionally, the 12z run is forecasting unusually low temperatures during the night compared the 00z run.

Could you please check the reasons of these discrepancies?
Is it related to the use of different cumulus, microphysics, or radiation schemes between the two runs (00Z and 12Z)?

Furthermore, I have also noticed that the 00Z run appears to be overestimating simulated radar reflectivity.
Could you please look into this issue , along with the discrepancies mentioned above, and work towards resolving them?

Thank you

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Discrepancies in Forecasts between 00z and 12z runs in WRF 4km model 3 weeks 2 days ago #962

Hi Ameerrh,
Thanks for noticing.
The 00z and 12z runs are on different servers. The 12z was not running a cumulus scheme on the nested 4km domain but only on the 12km domain. It also was running a different micro physics scheme.
I have edited the setting to match the 06z run and set a new common micro physics scheme for both models
There should now be more consistent forecasts from the two models.

David

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Discrepancies in Forecasts between 00z and 12z runs in WRF 4km model 3 weeks 1 day ago #963

  • ameerrh
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Hi David,
Thank you for your prompt response.
I have compared the precipitation forecasts from the 00z and 12z runs today, and there is still a significant difference between them.
Additionally, it appears that the model did not provide the simulated radar reflectivity forecasts for either the 00z or 12z runs. What is the reason?

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Discrepancies in Forecasts between 00z and 12z runs in WRF 4km model 2 weeks 6 days ago #964

Hi Ameer,
Pls contact me via gmail so that I may be able to help you further
u s r sy.wild.silk
Thanks, David

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