2016-02-06, 19:19:30
Yes, when no METAR is available, the weather is purely generated from GRIB data.
In your case, the neareast station in the sim is ED6C which is interpolated by the GRIB stations 18670 18669 18542 and 18541 (the numbers are used internally and do not mean anything).
So, probably none (respectively the minority) of these stations reported snow.
Anyhow: other than for winds (aloft) GRIB data is not really that useful and accurate. METAR reports are far better when it comes to clouds, rain, pressure, etc.pp.
In your case, the neareast station in the sim is ED6C which is interpolated by the GRIB stations 18670 18669 18542 and 18541 (the numbers are used internally and do not mean anything).
So, probably none (respectively the minority) of these stations reported snow.
Anyhow: other than for winds (aloft) GRIB data is not really that useful and accurate. METAR reports are far better when it comes to clouds, rain, pressure, etc.pp.
Regards