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Jan 16-17th Boom or Bust


Wurbus
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1 hour ago, John1122 said:

I put very very little stock in it, but the JMA has the LP over Panama or Tallahassee area and 850s well south of the forum area.

It will be interesting if models trend back to the low placement along the gulf with a more classical Miller A look.  Time flies following model runs, I cant even remember the snow amounts that were projected with more that look a mere 36 hours ago?

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National Weather Service Nashville TN
222 PM CST Wed Jan 12 2022

.DISCUSSION...

Beautiful mild mid-January day across Middle Tennessee today with
clear skies, occasionally gusty southwest winds and current
temperatures in the upper 40s and 50s. Continue mild weather is
expected tonight into tomorrow with lows only dropping into the
30s and highs on Thursday once again in the upper 40s and 50s. A
fast-moving clipper system will race across the area Thursday
afternoon and early evening, and although low levels will be
fairly dry a few light rain showers are possible - mainly in our
northeast counties - which could briefly end as light snow
showers. Temperatures will cool down a bit behind this system with
lows falling into the upper 20s to low 30s Friday morning, and
highs topping out in the 40s on Friday afternoon.

This weekend continues to be a forecasting nightmare as 12Z model
suite indicates a closed upper low pressure system takes an
unusual U-shaped path from the Plains across the Gulf Coast
states then up the East Coast, bringing a long duration
precipitation event to Middle Tennessee from Saturday into
Sunday. Exactly where this upper low and its associated surface
features track has major implications on whether we will see
wintry weather across Middle Tennessee. In general, models
indicate strong WAA ahead of the upper low will keep mild air in
place most of Saturday, with precip staying as mostly rain,
before the atmosphere cools at all levels Saturday night and
Sunday as the low moves near then east of our forecast area,
leading to a mix of rain and snow with a changeover to all snow
before precipitation ends.

GFS continues to be further north with its track versus the
ECMWF, and thus has a rainier solution than the more wintry Euro.
Very difficult to pinpoint potential snow amounts due to these
track differences, but overall currently appears our western and
northern counties have a better chance to see some accumulating
snowfall with this system while our southern and eastern areas
have a lower chance. Forecast soundings indicate this will mainly
be a rain or snow event, although some sleet is possible albeit
more unlikely. WPC and model liquid QPF totals range from 0.5 to
over 1.5 inches with this event, suggesting parts of the area
could see another significant snowfall - which would be our third
this month if it occurs. Hopefully the models come into better
agreement over the next couple of days for sanity`s sake. After
this system, dry and colder weather makes a return for the first
part of next week.
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2 minutes ago, PowellVolz said:


How much of that is sleet, freezing rain in our area?


.

It should be none. WXBell claims to have separate maps for sleet, freezing rain and snow. For the most part, this is a snow or no situation for most of the forum region except maybe some parts of Kentucky, far NW or far NE. The Euro showed less than .01 zr and around .2 to .3 sleet at most. 

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