Something "strange"??? with total cld cover

Questions and other topics related to UEMS 18.
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emsiwx
Posts: 80
Joined: Sun Aug 12, 2012 11:07 am

Something "strange"??? with total cld cover

Post by emsiwx » Wed Apr 18, 2018 10:47 pm

Hi,

has anyone noticed somehow strange total cloud cover, lately? Most visible over the sea, sharp 100% cloud cover , following the cost, and over the land nothing?

Seems strange to me, compared to forecasts, approx. 1-2 weeks ago, or maybe the same time, when Ptiles download problem occured.

Running 18, not latest version yet though. However, it has appeared with no changes from my side. Or all is OK, and it is just me wrongly thinking it looks no good?

Thanx for your opinions, comments.

Marian

Image

meteoadriatic
Posts: 1565
Joined: Wed Aug 19, 2009 10:05 am

Re: Something "strange"??? with total cld cover

Post by meteoadriatic » Thu Apr 19, 2018 8:09 am

This is a fog.

emsiwx
Posts: 80
Joined: Sun Aug 12, 2012 11:07 am

Re: Something "strange"??? with total cld cover

Post by emsiwx » Thu Apr 19, 2018 4:29 pm

Hi Ivan,

many thanks for your reply. I thought, it could be the fog, or before, when Saharan dust was quite heavyly affecting EU.... I am using Monthly Aerosol db for init.

Did not think, a fog could be so intense, and make such a sudden difference compared to previous runs.

Thank you.

Marian

emsiwx
Posts: 80
Joined: Sun Aug 12, 2012 11:07 am

Re: Something "strange"??? with total cld cover

Post by emsiwx » Thu Apr 19, 2018 10:11 pm

Hi again,

I just can't help myself asking... Do you really think, it is ok for 24h average to get such a "nice milky" look, 100% coverage like that?

I have never ever seen the outputs liked that.

Image

Thank you again in advance for your opinions/comments.

Marian

meteoadriatic
Posts: 1565
Joined: Wed Aug 19, 2009 10:05 am

Re: Something "strange"??? with total cld cover

Post by meteoadriatic » Fri Apr 20, 2018 8:31 am

This shown on map is pretty obviously fog (check low level relative humidity to ensure). With that being said, WRF is generally very bad in forecasting fog, so there is no guarantee that this should happen at all.

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