For next week
.LONG TERM /TUESDAY THROUGH FRIDAY/...
Brief reprieve from the cold and a period of active weather still on
track. Trend that keeps showing up, now even in the ECMWF guidance,
is a quicker return to cold and possible snow as early as Thursday.
MOS guidance from GFS and ECMWF look pretty similar on Thursday
now, at least over western NY. Still time to sort this all out
though as there will likely be changes as this system is still
over the Gulf of Alaska.
On Tuesday, sfc low pressure crosses Ontario and James Bay.
Warm front ahead of this may generate a few rain showers late as
highs will reach the upper 30s to lower 40s (warmest calender
day since Jan 19th). Cold front arriving later Tuesday night
could also produce a few rain/snow showers. Cold front eases
across into Wednesday. Broad jet in strong southwest flow aloft
and Gulf of Mexico moisture coming into play will result in
precip spreading along inverted trough over deep south toward
the cold front that is in our region. Low-level thermal gradient
overhead, so will carry a mix of rain/snow. Best chance of only
snow will be over far western NY and across the North Country.
Some snow accumulation could occur in these areas starting late
Wednesday.
Uncertainty increases into Wednesday night and Thursday, though one
trend that is showing up is colder with better chance for snow on
Thursday, especially western NY and North Country as low-level
thermal gradient continues to trend farther east and southeast.
Ptype in forecast is simple for now, just rain and/or snow or a mix
of both. Certainly possible additional frozen precip (fzra, sleet)
could occur as well depending on depth of cold air and where warm
layer will reside over that cooler air at the sfc. No matter what,
Gulf of Mexico moisture will be streaming into our region, so this
system will need to be watched as if ptype is wintry, could be
higher impact system. At least right now it does seem that the
warmer and wetter impacts (flooding, ice jams) we were looking at a
few days ago are diminishing for our area. Time will tell if these
trends hold or if the thermal gradient trends west again. It
could. Once this system passes by, cue the return of more arctic
air which will arrive across the Great Lakes and northeast by
next weekend.