A wave of low pressure will deepen as it tracks along the east coast of the USA this weekend before heading into Atlantic Canada and decaying next week. NS, NB & PEI will  be affected later on Sunday and into Monday with the storm depicted in the 985-990mb range at this time; subsequently weakening as it moves towards NL through mid-week.

06z RGEM @ hour 12 / 24 / 36 / 48:

I_nw_EST_2017051306_012I_nw_EST_2017051306_024I_nw_EST_2017051306_036I_nw_EST_2017051306_048

00z GFS total precip @ hour 96:

gfs_tprecip_quebec_17

gfs_tprecip_labrador_17


The passage of this system will finally allow upstream continental ridging to shunt eastward and bring notably warmer conditions next week as another dynamic closed upper low dives SE along the west coast.

00z EPS 500mb height anomalies @ hour 96 / day 4:

ecmwf-ens_z500a_namer_5

00z EPS 500mb height anomalies @ hour 168 / day 7:

ecmwf-ens_z500a_namer_8

The ensuing western trough / eastern ridge configuration could spawn unsettled & potentially severe weather as the trough successively migrates downstream.

00z EPS 500mb height anomalies @ hour 240 / day 10:

ecmwf-ens_z500a_namer_11

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