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Jan 15-16 Winter Storm


Brick Tamland
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2 minutes ago, MillerA said:

Gsp noaa weather office has out their afternoon discussion, and have updated local forecast. Enjoy. 

LONG TERM /SATURDAY NIGHT THROUGH WEDNESDAY/...
As of 240 pm EST Wednesday: The forecast for the weekend remains in
a state of flux. Readers are advised to continue to manage their
expectations. On the one hand, confidence continues to increase
that we will have a winter storm that will probably impact the
entire forecast area beginning Saturday night and continuing
through most of Sunday. Precip probs are now into the categorical
for that time period. On the other hand, details about precip-type
distribution are very murky in both space and time, and that is
having a negative impact on confidence. The latest problem is
the operational GFS solution, which has trended toward moving the
850 mb low well west of the mtn chain, allowing for strong warm
advection that would establish a warm nose in most places east
of the mtns. The result would be a steady changeover/mix to sleet
and freezing rain, if the operational GFS is correct. It is worth
noting the 12Z GEFS is still holding onto snow as the most likely
p-type at GSP, but there is enough of an increase in sleet/freezing
rain outcomes that places like CLT have an almost equal chance of
the primary p-type being any one of the four. Meanwhile, the ECMWF
keeps its 850mb low moving overhead/southeast of the mtn chain. The
operational ECMWF would allow for a long enough period of time for
snow to fall east of the mtns before a weaker warm nose pokes up
from the south to changeover along/S of I-85. Worth considering is
that in most situations, the warm nose wins across the area south of
I-85. Still way too early to consider amounts of individual p-types,
but the trend in the QPF has gone up substantially, which will
in turn flow down into the precip accums. The forecast guidance
blend used to create the new fcst will sometimes show a lag that
does not quickly jump to any new trend, so for the time being,
the fcst will look more like the cooler ECMWF/Canadian ensembles
instead of the more icy GFS. High temps will not get out of the
mid-30s. Eventually, as the system passes, a change back toward
light snow should happen late Sunday. Model guidance shows a strong
signal toward a NW Flow Snow event along the TN border Sunday night
that would continue through Monday and might not taper off until
Tuesday morning. Temps will remain about 10 degrees below normal
through Tuesday, with a warming trend into Wednesday. Another
weaker system may approach from the west Wednesday afternoon,
but this was downplayed for the time being.

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20 minutes ago, ozmaea said:

I try not to ask to many question but this I have no clue how to read.....what is this saying for gsp

Sent from my SM-N986U using Tapatalk
 

A mixed bag of fun  :D   Euro-7.5" sn, .60 zr. .2 ip  GFS 3" sn, .50 zr, 3" ip and GEM 9" sn, .10 zr and 4" ip

19 minutes ago, Tigerchick224 said:


Now that is a thing of beauty. So much pink and purple! You don’t see that much.


.

IKR?! I absolutely love watching the colors fill in ^_^

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16 hours ago, ILMRoss said:


I agree with all of this. I see the point. It’s not a perfect graphic but on a snow week in news when you have 100 people asking you about the storm in social, when you have to coordinate messaging, when you have to produce a couple of afternoon/evening shows and oh on top of all of that do a bit of forecasting it’s a time saver and a “don’t let perfect get in the way of good” kind of graphic.

I’m tuning out the 00z ICON I thought it looked kind of wonky

I know this is late but I’ve been out all day.  I don’t think you’re making the correct read on the graphic. It is not a “don’t let perfect get in the way of good” kind of graphic.  Quite the opposite. By using values like 22%, 27% etc. instead of just rounding them to the nearest 5 they have made it an “imitation of accuracy to 1% without corroborating data” kind of graphic.

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4 minutes ago, weatherguysc said:

18z NAM 60-84 has the low almost in the Florida panhandle at 84

floop-nam-2022011218.ref1km_ptype.conus.gif

Nice pick up. The NAM is really feeling the effects of that HP, forcing it to be pushed underneath. That should make the CNC folks happy seeing this. Just another plausible scenario. 

Nice confluence up top and vort is weaker this run.

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Being that its the 84 hour plot it should be taken with caution but fwiw 18z nam has dpts crashing in time to leave little doubt of significant ice/snow accumulations in north ga. 20 degree dpts down to Athens and Gainesville right ahead of the precip with even colder air incoming in the low levels.   

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3 minutes ago, Buddy1987 said:

Nice pick up. The NAM is really feeling the effects of that HP, forcing it to be pushed underneath. That should make the CNC folks happy seeing this. Just another plausible scenario. 

Nice confluence up top and vort is weaker this run.

Yeah, that's what we need, further south and east. 

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