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Potential 1/17-1/18 threat


BullCityWx

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32 minutes ago, rjtysinger said:

Would be serving that there is at least a threat in the time frame.  I’m on my 7 off at work.  Waiting to see how it unfolds.  Wondering if we do have accumulation if it would be lower temps for the daily highs in the few days following.

Pretty cold for daily highs and lows for about 48hrs after this potential weather 'event' next Wednesday

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6 minutes ago, NCSNOW said:

Still got ice on the deep river coming home today where 85 crosses it. Stuff really froze thick to still be visible with our 4 day thaw.

Parts of Lake Norman split from from I-77 had a frozen layer of thin ice after last week's cold. Never seen that before.

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Very Interesting AFD coming out  of KILM tonight..

Long term /Monday through Friday/...
as of 300 PM Friday...cold weather will persist through the period
with a risk for wintry precipitation Tue night into Wed eve.

High pressure will wedge down the East Coast Mon with a coastal
trough developing offshore during Mon and Mon night. Low pressure is
expected to develop off the Carolina coast, but where and when this
area of low pressure initiates is still a big question. Should the
low develop close enough to the coast, then there will be a risk for
precipitation along portions of the more immediate coast later Mon
and Tue and possibly into Tue night. There is some potential that
any precipitation which does clip the coast in direct association
with the developing coastal low and trough could be a wintry mix.

Confidence is a little higher that a vigorous upper low and
associated strong shortwave energy will move across the eastern
Carolinas and provide ample lift in the wake of the surface low. The
column should be sufficiently moist and cold enough to support
frozen precipitation, at least for a portion of the time. Timing is
not quite nailed down, but the GFS has trended further S with the
upper low and slowed its timing and is now in better agreement with
the Euro in showing the brunt of the upper level support pivoting
across the forecast area Wed into Wed eve. We have included pops for Tue eve
and night through Wed afternoon/eve, first starting across our
inland most zones and ending lastly across the Cape Fear area.
Snow is favored, although precipitation should tend to at least mix
with rain during the warmest part of Wed afternoon before any left
over precipitation trends back to snow.

For obvious reasons, including the time range we are dealing with
and model inconsistencies, we can not accurately forecast
accumulations at this time. However, there is a good chance that
some accumulation will occur. Generally speaking, in these
scenarios, we do not receive significant precipitation. However,
should the coastal low develop closer to the coast, then more
significant quantitative precipitation forecast is possible. We will continue to monitor and later
forecasts should provide more refined details.

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4 minutes ago, SnowGoose69 said:

The CMC upper levels would suggest there should be more snow across the deep south from 96-108

 

You think so? The H5 levels suggest the flow is too westerly to get any real moisture fetch from the gulf going. Only around 114 does the SW flow really get going. Too late for Atlanta at least.

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2 minutes ago, LovingGulfLows said:

 

You think so? The H5 levels suggest the flow is too westerly to get any real moisture fetch from the gulf going. Only around 114 does the SW flow really get going. Too late for Atlanta at least.

I think this has not been an ATL threat since it popped up? But not sure

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5 minutes ago, Poimen said:

So the theme of the night seems to be lighter totals and farther east, but more models on board with something. 

Its gonna back and forth till Sunday when the hi res come into range and the energy is better modeled, still the trend is for something which is better than nothing.....I like these setups they tend to over perform when they actually happen....a lot of the storms that get the whole state evolve this way....I am optimistic with this one....I have my yearly average already anything on top is butter....I also like the repeating Wed timeframe that's a check in the its gonna happen column for me.

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From RAH:

Regardless of whether or not a closed low forms within the

aforementioned meridional trough, strong jet dynamics and deep layer

frontogenesis accompanying the upper jet/front and related low level

frontal zone should be sufficient to support at least a light

precipitation event over cntl NC Tue night-Wed. That precipitation

would likely fall in the form of light rain or rain mixed with snow

early Tue night, since temperatures will have warmed considerably,

into the upr 40s to lwr 50s for most Tue afternoon; and the models

are typically too quick in surging cold air masses east of the cntl

Appalachians of VA/NC. However, partial thickness values and

boundary layer temperatures are both forecast to become supportive

of a west to east changeover to snow Tue night-Wed morning. This

system certainly has the potential to produce measurable snow over

the middle Atlantic states, including cntl NC, but forecasting such

an occurrence with any degree of confidence at this time range would

be premature. Indeed, if the trough aloft is weaker and more

positively-tilted as it approaches NC, then a light rain, to

inconsequential flake event would result. Stay tuned

 

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