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December 21st-24th, 2022 | Plains/MW/GL/OV Winter Storm


Ohiobuckeye45

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000
FXUS63 KIND 180740
AFDIND

Area Forecast Discussion
National Weather Service Indianapolis IN
240 AM EST Sun Dec 18 2022

Thursday through Saturday(Potential Winter System)...

Latest guidance continues to signal towards the potential for an
impactful low pressure system to pass through the Ohio Valley
sometime between Thursday morning and Friday. With that said, there
is still significant variability amongst both ensemble members and
various deterministic runs.


***************************************
Differences in Deterministic Solutions:
***************************************

First, lets discuss the deterministic runs. The last few GFS runs
have done a better job of representing the expected very anomalous
cold sector within this system. This along with a gradual shift
westward of the upper level ridge axis over the western CONUS has
allowed for solutions closer to the expected conceptual model
discussed in previously (see below). This leads to increased
confidence that a deep low pressure system will develop over the
Great Lake or Ohio Valley late next week. There will still be a
significant spread in the snowfall maxima over the next several runs
amongst all deterministic models, of which leads to plenty of
uncertainty on snowfall expectations Thursday and Friday.

One trend of note is a slight delay in pressure depletion as the low
tracks west to east. This is likely due to the lack of true lee
cyclogenesis, and with organization of dynamic forcings becoming more
aligned later in its life cycle. This will be something to watch
over the next several days to see if this trend continues.

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4 hours ago, Ohiobuckeye45 said:

For a 970 MB low the ecm sure is dry (syntopically speaking, without lake enhancement)

You can thank the disturbance/coastal in front of it for stealing some moisture. Great runs last night. GFS nudges back west. 

Edited by junior
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