t a d,
If there is snow on the cloud monitors,will that not affect their measurements.It can muck up the IRVR.It will probably think it's sky obscured in fog.
The "Cloud Monitor" aka Cloud BASE Recorder does NOT affect the IRVR.
IF there is ANY loss of visibuility due to "Precipitation" eg, rain, snow etc Then
that "may" affect the IRVR.
SAMOS "Reports" [what IT "sees"]
Viz between two "fixed" points [fairly close together]
Cloud A vertical "static" beam. [If it sees "Nowt", it reports CAVOK]
Precipitation.....NOW there is the "bugbear".....
At Manch, the "sensors" are 2km from the "observer" [The ATSA]. Said ATSA has to accept or decline wx info, when "presented" for a METAR.
SAMOS "reports" 170/04 3000BR NRC 04/03 1004
"MY" obs 170/04 CAVOK 04/03 1004
As atsoo said..It's NOT very good
watp,iktch