GFS - MSLET vs PRMSL issue. Can UEMS initialize on MSLET?

Questions and other topics related to UEMS 18.
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norulz
Posts: 91
Joined: Thu Mar 12, 2015 1:43 pm

GFS - MSLET vs PRMSL issue. Can UEMS initialize on MSLET?

Post by norulz » Sun Sep 02, 2018 12:20 pm

There appears to be a relevant debate going on regarding the accuracy of GFS PRMSL after smoothing is applied. It is claimed that the smoothing of PRMSL reduces resolution of the isobars significantly and this can lead to inaccurate forecasting.

MSLET is also pressure reduced to MSL but without smoothing applied.

Links with more information on this: https://ams.confex.com/ams/33HURRICANE/ ... 40155.html
https://ams.confex.com/ams/33HURRICANE/ ... 018-V4.pdf
http://luckgrib.com/blog/2018/08/28/gfs ... ssure.html

My understanding is that UEMS initializes with PRMSL when using GFS data. The personal tile server (gfsp25pt) includes MSLET in the initialization gribs but is it being used?
How can one force prep into using MSLET and to disregard PRMSL?

David
Last edited by norulz on Mon Sep 03, 2018 11:46 am, edited 2 times in total.

lcana
Posts: 68
Joined: Wed Nov 30, 2011 4:34 pm

Re: GFS - MSLET vs PRMSL issue. Can UEMS initialize on MSLET?

Post by lcana » Mon Sep 03, 2018 10:16 am

Very interesting topic, Norulz!

I'd like to know it too. If anyone knows about this, please share it with us

Best,

Luis

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