Area Forecast Discussion
Issued by NWS Gaylord, MI

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FXUS63 KAPX 182049

Area Forecast Discussion
National Weather Service Gaylord MI
349 PM EST Sat Nov 18 2017

.NEAR TERM...(Tonight through Sunday)
Issued at 345 PM EST Sat Nov 18 2017

High impact weather potential: Slick spots on area roadways possibly
developing tonight. Snow covered and slippery roadways possible

...Lake effect kicking in...

Synoptic moisture peels out to the northeast through this evening as
low pressure continues to track by to our south. Progressively
colder air then advects in behind the departing system increasing
over lake instability through Sunday. This will lead to the
development of northerly flow lake effect rain and snow showers
later this afternoon which will change to snow early tonight. The
flow will back overnight into the north northwest before finally
settling into the northwest late tonight into Sunday as lake effect
snow continues. Activity may become enhanced and more widespread for
a time Sunday as a short wave drops down through the flow. Areas
roads may become slick due to falling temperatures and any rain
showers transitioning over to snow showers. Snowfall accumulations
tonight expected to range from 1 to 2 inches along and west of US
131. Accumulations Sunday of 2 to 3 inches are expected in the
normal snow belts of northwest lower and eastern upper.


.SHORT TERM...(Sunday night through Tuesday)
Issued at 345 PM EST Sat Nov 18 2017

Pattern Forecast:  Active pattern continues through next week.
Background pattern remains negative PNA, with high amplitude ridging
over the western CONUS and troughing over the eastern. A series of
clippers running along the baroclinic zone, and through the Great
Lakes,  will provide periodic reinforcement of the eastern troughing
with colder air helping to deepen the troughing. The currently
negative, and forecast to become more so, arctic oscillation will
certainly help the colder air push south as well. Much of the week
will see this up and down mix of brief height rises being suppressed
by a clipper before a more prolonged cold push next weekend.

Primary Forecast Concerns/Challenges: Timing will likely be an
issue, as is often the case with these active clipper patterns.
Another rain to snow transition expected Tuesday.

Any lingering lake effect Sunday night will gradually be shut down
through the morning Monday as high pressure to our south backs the
flow to the SW and increase WAA. This will moderate temperatures a
bit, with Monday and Tuesday high temperatures near 40. Though the
Tuesday high will likely be overnight for many areas, as the next
clipper in line will arrive with colder air and precipitation by
early afternoon. Those east of I-75 may see the arrival later in the
afternoon. Precipitation will arrive mostly liquid, with a fairly
quick change over to snow through the afternoon. This should carry
into Wednesday with lake effect.


.LONG TERM...(Tuesday night through Saturday)
Issued at 345 PM EST Sat Nov 18 2017

Pattern remains progressive through the extended, with clippers
moving through the flow working to suppress height rises trying to
work into the region. This will bring a very familiar period of
clipper system precip, followed by some lake effect, then a brief
clearing. Signs point to a more prolonged visit of cold air starting


.AVIATION...(For the 18Z TAFS through 18Z Sunday afternoon)
Issued at 1258 PM EST Sat Nov 18 2017

Low pressure will move off to our southeast through tonight. Low
clouds will hang around through this afternoon while cigs slowly
lift into the MVFR category. Northerly flow lake effect is
expected to kick in at TVC and MBL this afternoon. The flow will
then back into the northwest overnight shifting the lake effect to
include APN at times. Winds will pick up and be gusty through the
taf period.


Issued at 345 PM EST Sat Nov 18 2017

Lower end gale force gusts are expected for late this afternoon and
tonight for much of Lake Michigan and Huron. This is due to a
tightening pressure gradient on the backside of developing low
pressure that crosses the srn and eastern Great Lakes. Solid
advisory winds elsewhere. NW winds taper off some heading through
Sunday afternoon and night while also backing more out of the west,
but gusty conditions still expected due to deep overlake
instability. Rain and snow showers will transition over to lake
effect snow showers tonight into Sunday evening.


LH...SMALL CRAFT ADVISORY until 7 PM EST Sunday for LHZ345-346.
     GALE WARNING until 7 AM EST Sunday for LHZ349.
     GALE WARNING until 11 AM EST Sunday for LHZ347-348.
LM...SMALL CRAFT ADVISORY until 7 PM EST Sunday for LMZ341.
     GALE WARNING until 7 AM EST Sunday for LMZ323-342-344>346.
LS...SMALL CRAFT ADVISORY until 7 PM EST Sunday for LSZ321-322.


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