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1/10-1/12 Southern Slider


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Nashville disco

LONG TERM...
(Thursday through next Tuesday)
Issued at 1053 AM CST Tue Jan 7 2025

The story for this forecast continues to be the snow potential for
Friday. Brief ridging on Thursday ahead of the next trough will
warm temps slightly, but still going to remain with cooler temps
and highs staying in the 30s. Snow is expected to begin in the
west Friday morning with the trough over the Plains working its
way east. Peak snowfall looks to be mid morning through the
afternoon across most of the mid state, and into the evening to
early overnight hours for the Plateau. This will be a quick hit of
snow, but right now, models are pretty consistent showing 1 to 4
inches of snow depending on which model you are looking at. The
GFS and its ensembles are the most aggressive with snow, and on
the higher end of amounts thanks to a stronger trough, and near
perfect isentropic lift during the day Friday. Decent Q-vector
convergence and upper level support stays around through the day,
so the GFS is fully onboard with heavy snow. The ECMWF, its
ensembles, and the NAM are still showing snow, but not as
aggressive as the GFS/GEFS. Still, broad ensemble consensus is 1
to 4 inches with the latest forecasts for Friday, and the most
likely scenario is 2-4 inches area wide. If models start leaning
towards the GFS solutions, that will go up, but going the other
direction, amounts will go down slightly. Probability of 2 inches
or more is roughly 50 to 70 percent area wide.

Temps will struggle to get above freezing Saturday, but ridging
tries to build in Sunday so that will help with melting snow. For
the most part, the remainder of the forecast looks dry, with some
light snow possible in the north Monday but agreement and
confidence is low. Temps dont look to warm up much next week with
highs in the 30s/low 40s and lows in the teens/20s.

 

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Real question I have is many models have most of MRX CWA in the 2-4 or 3-5 range, will MRX dust off the winter storm product, or Winter Weather Advisory?  1-3 is advisory criteria, but winter storm product for MRX is anything greater than 3 inches (for the Great valley) which looks probable for most if not all the CWA the potential is pretty good to break past 3".  I'm sure we won't likely see a winter storm product issued before Wednesday afternoon if they do go that route.

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3 minutes ago, fountainguy97 said:

How concerned about dryslot/downsloping do you guys think I should be? Some earlier gfs runs that were more of a south to north orientation had a nice hole over the TN/NC border. 
 

thinking the flatter west to east we have seen more today is helping prevent that for my backyard?

Don't get me started about this. lol  You can ask @Carvers Gapmy thoughts on downsloping/dryslot.  Was just mentioning to him this morning about the "double whammy" snow demon not everyone gets the joy of facing.  haha  

I guess when you live where we live you can never really shake it being a concern, but it's less of a concern today than it was 36 hours ago.  Trending in the right direction.  I like the trajectory of the system and the orientation of the precipitation.

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4 minutes ago, jaxjagman said:

I dont see how a dry slot would effect us if the storm formed into a trowel not the track of the storm forecasted

More of a microclimate thing, Jax.  Unicoi, Greene & parts of Washington County tend to pull downslopes and dryslots like a magician pulls a rabbit from a hat.  It's a talent we have in spades.

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