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December 2022 Medium-Long Range Disco


WxUSAF
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LWX morning disco on the threat

.LONG TERM /TUESDAY THROUGH FRIDAY/...
H5 riding will briefly build in Tuesday as a 1036 mb + high remains
over eastern Quebec. This will result in subsidence at the surface
with dry and sunny conditions. Temps will be  in the low 40s for
most (30s mountains).

Now for the main focus of the long term, the highly advertised storm
system. There remains considerable spread between different global
guidance - with the GFS having more of a suppressed/progressive wave
while the Euro is much more amplified. Overall ensemble guidance
continues to support the Euro with a parent ULL moving through the
Ohio Valley Wednesday and Northeast/offshore into the Atlantic by
Friday/Saturday. Uncertainty remains regarding any coastal low
formation and associated wintry precipitation. Given the anomalous
high pressure north of the region and surface ridge extending down
the spine of the Appalachians, wintry precipitation (all types) is
possible across the entire area in the late Wednesday to early
Friday timeframe with higher chances along and west of the Blue
Ridge mountains. Will continue to monitor this system as it gets
closer and confidence increases.

As the ULL moves offshore, there is the potential for a long-
duration upslope snow event. Models hint at 24+ hours of QPF across
the mountains starting near 12Z Friday into Saturday. This will be
highly dependent on the aforementioned system and ULL pattern, will
continue to monitor. Strong winds are possible areawide on the
backside of the low. Temps will be below normal behind the
system.
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