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000
FXUS63 KEAX 030031
AFDEAX

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE KANSAS CITY/PLEASANT HILL MO
631 PM CST Mon Dec 2 2013

.SHORT TERM...(This Evening through Tuesday Night)
Issued at 340 PM CST MON DEC 2 2013

Short term concerns will once again center on fog, possibly dense,
formation later tonight and its areal extent. Then next challenge
will be timing of the much anticipated Arctic cold front.

For tonight low-level moisture remains in place and going nowhere
with southerly winds continuing. While the fog/stratus finally
eroded late this afternoon do anticipate it reforming overnight,
initially most likely over the areas which were last to
clear...meaning the far southern counties as well as it spreading
into northeast MO. Timing-wise after midnight but can`t rule out
earlier owing to the late dissipation today. SREF and NAM/RAP
condensation pressure deficit progs have performed well and they all
support the above scenario as well as a westward spread into west
central MO, including the KC Metro, towards sunrise.

The Arctic cold front will likely remain just northwest of the CWA
during the daylight hours of Tuesday, allowing one last day of much
above average temperatures. If the morning fog/stratus can dissipate
by late morning then a good chance entire region will see highs in
the 60s. Continue to favor the faster NAM/GFS solutions on cold
front advancement. Per coordination with adjacent offices have used
a 50-50 blend of the NAM/GFS which do a better job with the gusty
northwest winds in the post-frontal environment. Will leave current
forecast dry although post frontal stratus could yield a few
sprinkles.

.LONG TERM...(Wednesday through Monday)
Issued at 340 PM CST MON DEC 2 2013

For the last few days, coarser scale models have been indicating a
relatively narrow corridor of snow from east central Kansas through
central Missouri. The higher resolution NAM continues this trend but
the better resolution provides a bit more detail and confirms that a
narrow band is more likely. First, a fairly tight baroclinic region
should setup across the southern half of the forecast area. This
elevated boundary, which shows up well at around 850mb to 800mb
should then be activated by a weak wave moving out of areas to the
southwest. This will occur underneath a strong upper jet with the
right rear quadrant of the upper jet streak enhancing lift over the
area. Strong frontogenesis is then expected to develop as the
theta-e gradient tightens. The strong coupled forcing will be
quick-lived but will likely lead to at least several inches of snow
during the day Thursday and into the evening hours. While it looks
like there will be at least light snow across a good portion of the
forecast area, any accumulating snow looks to occur in a very narrow
corridor. These types of systems are inherently difficult to pin
down so even what it depicted now in the forecast is very likely too
broad, with a location that will be probably be /fine-tuned in the
coming days.

Otherwise, the bitter, unseasonably cold temperatures will persist
through the remainder of the forecast with highs in the 20s and lows
in the single digits to teens. The long wave trough responsible for
this pattern shift shows no signs of easing and strong high pressure
centers continually reinforce the already cold air mass.

&&

.AVIATION...(For the 00Z TAFS through 00Z Tuesday Evening)
Issued at 626 PM CST MON DEC 2 2013

Little changes made to the aviation forecast. Models are not quite as
aggressive regarding overnight fog potential, so backed off a little
bit on the timing. There does appear to be a window for lowered VSBY
and CIG in the early morning hours, so held onto the IFR period early
Tuesday morning. Expect a gradual improvement to conditions as the
day continues, perhaps reaching VFR by 18z. KMCI and KMKC look to
have the best chance for low level stratus, while KSTJ looks to be
north of the stratus. Model soundings for KSTJ do indicate low level
saturation, indicating a brief period of fog between 12z and 15z.

&&

.EAX WATCHES/WARNINGS/ADVISORIES...
KS...NONE.
MO...NONE.
&&

$$

SHORT TERM...MJ
LONG TERM...CDB
AVIATION...Leighton