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26 Sep 2020

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difference compared to the storm that hit Corsica yesterday 1 year 7 months ago #923

PTP Topic Author Offline New Member Posts: 15 Thank you received: 2	I see a huge difference compared to the storm that hit Corsica yesterday morning, depending on whether you open the Nice 4km map, or Corsica 4km Michel Attachments:
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difference compared to the storm that hit Corsica yesterday 1 year 7 months ago #924

davidgal
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Administrator
Posts: 299
Karma: 1
Thank you received: 73

Hi Michel,
The Corsica GRIB is produced on a different server (more powerful) running a newer version of WRF and also with different physics scheme settings as allowed be the extra power. All these factor have shown that they give better predictions in general.
The server running production for France 12km, Gulf of Lyon and Nice 4km is using an older version of WRF with settings that occasionally exhibit an over sensitivity to convection events as shown in the cyclogenesis event seen in the Nice GRIB.
The plan is to replace the old server with one, not quite as old, in the coming months and the forecasts will improve.
Best,
David

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difference compared to the storm that hit Corsica yesterday 1 year 7 months ago #925

PTP Topic Author Offline New Member Posts: 15 Thank you received: 2	Ouch, ouch... it seems that the old server produced the best production Michel
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difference compared to the storm that hit Corsica yesterday 1 year 7 months ago #926

davidgal Offline Administrator Posts: 299 Karma: 1 Thank you received: 73	Can you verify that the event shown in the Nice grib is accurate?
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difference compared to the storm that hit Corsica yesterday 1 year 7 months ago #927

davidgal Offline Administrator Posts: 299 Karma: 1 Thank you received: 73	It was indeed a violent convection event. Food for thought on which convection scheme to use. You are correct - the older settings caught the convection and the new ones didn't.
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difference compared to the storm that hit Corsica yesterday 1 year 7 months ago #928

PTP Topic Author Offline New Member Posts: 15 Thank you received: 2	OK, latter... merci...
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difference compared to the storm that hit Corsica yesterday

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