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1/19 - The Weekend Roulette Wheel Thing


DDweatherman
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LWX AFD from this morning... mentions the ICON again

LONG TERM /SUNDAY THROUGH WEDNESDAY/...

Deep and broad longwave troughing will span across nearly the entire
width of the CONUS by Sunday morning, with high amplitude ridging on
either side across the Eastern Pacific and North Atlantic. Locally,
we`ll be situated within southwesterly flow aloft on the front side
of the trough. A low amplitude shortwave will progress through the
base of the trough and rapidly approach the area from the southwest
during the day on Sunday. Model guidance is still showing a large
amount of spread with respect to the handling of this disturbance.
Amongst deterministic guidance, some models (the Euro, ICON, and
UKMET) show a light snowfall event occurring on Sunday as this
disturbance moves overhead, others (the Canadian) show a more
amplified system with both ice and snow across the area, while
others yet (the GFS) show no precipitation across the majority of
the area. Such spread is also evident in ensemble modeling systems
such as the EPS, GEFS, and GEPS. Probabilistically, a lighter
snowfall event is the slightly favored solution, with a little over
half the ensemble members showing a light snowfall event. There are
a fair number of ensemble members that also show no precipitation to
the east of the mountains. The heavier precipitation scenario with
mixing (as advertised by the deterministic Canadian) appears to be a
bit of an outlier solution within the probability space at this
juncture. Any precipitation that occurs with this system should wind
down Sunday evening, with dry conditions to the east of the
mountains for Sunday night. Upslope snow showers will linger in the
Alleghenies through Sunday night, and potentially even Monday
morning.
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