Waves of precip moving through the Upper GL will lead to significant snowfall as well as a corridor of potential sleet and freezing rain through the course of this week.

The first impulse via the 06z RDPS, hours 12 / 24 / 36 / 48:

I_nw_EST_2017042406_012I_nw_EST_2017042406_024I_nw_EST_2017042406_036I_nw_EST_2017042406_048

Additional moisture should continue to eject towards the region beyond that point into mid-late week, leading to a messy transition zone between colder air to the NW and our expected end-of-month major warm sector to the S and E.

06z GFS, hours 60 / 72 / 84:

gfs_ptype_slp_ontario_11gfs_ptype_slp_ontario_13gfs_ptype_slp_ontario_15

Accumulated precip-type @ hour 96:

gfs_ptype_accum_ontario_17

The contrast between the varying air masses is quite stark @ hour 84:

gfs_t2m_a_f_east2_15

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