Area Forecast Discussion
Issued by NWS Kansas City/Pleasant Hill, MO

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FXUS63 KEAX 070458

National Weather Service Kansas City/Pleasant Hill MO
1158 PM CDT TUE OCT 6 2015

Issued at 317 PM CDT TUE OCT 6 2015

There are a few concerns in the short-term portion of the forecast.
One being fog potential tonight and the other being the
weather associated with the frontal passage Thursday/ Thursday

For tonight, high pressure is going to be situated right over the
region resulting in light/calm winds. Current dewpoints are in the
mid to upper 50s with overnight lows expected to be in the mid 50s.
So it looks like we`ll see several degrees below our crossover
temperatures for much of the forecast area. The monkey wrench in the
gears though is if and/or when the lower clouds move off or
dissipate. Short-range models vary quite a bit in handling the lower
level moisture which adds to the uncertainty. But given the ambient
boundary layer moisture and calm winds, feel there is at least a
chance for some fog so will go with some patchy mention late tonight
through an hour or two after sunrise.

The other challenge through the first few days of the forecast deals
with the frontal passage, its timing and precipitation chances as
well as how warm temperatures may get ahead of the front. Models are
in good agreement with the timing of the front, moving it through the
area from Thursday afternoon through Thursday evening. Strongly
veered winds ahead of the front, with likely deep mixing, suggest
many areas will be in the low to mid 80s. The GFS is a bit warmer,
mainly due to increased mixing depth, but takes the area into the
upper 80s. For now, low to mid 80s ahead of the front seem most
likely. The chances for severe, or even strong storms, ahead of the
front look very low. As mentioned earlier, winds will be strongly
veered, limiting convergence along the front. Deeper mixing may limit
instability and with the upper level shortwave trough passing to the
north, the strongest forcing is kept away from the area. None- the-
less, there is a modest amount of instability, likely in the 500 to
1000 J/kg range, so a few storms are possible during the frontal
passage. While the coverage of precipitation looks to be in the
scattered range, it looks like more widespread post-frontal showers
and isolated storms may develop as forcing from a trailing upper
shortwave influences the region. This more widespread development may
come later in the evening and possibly south of the I-70. So if there
happens to be any outdoor activities Thursday evening, they don`t
necessarily look like a washout, but may not be dry either,
especially later in the evening and further south of I-70.

For the extended portion of the forecast, much cooler conditions
will move into the region by Friday morning in the wake of the cold
front. But the cool high pressure area will quickly traverse the
area with southerly flow returning for Saturday. Thus, the 60 degree
highs will be short-lived as a return to more seasonal levels is
expected Saturday. Warmer than normal temperatures are expected
Sunday into Monday as warm advection persists. The forecast gets a
little more uncertain from there as it looks like we`ll see another
front move through. But the cooler air may lag behind until the
middle to later half of next week.


.AVIATION...(For the 06Z TAFS through 06Z Wednesday Night)
Issued at 1158 PM CDT TUE OCT 6 2015

Already seeing visibilities dropping into MVFR in a few spots around
the area, and with skies staying mostly clear overnight, fog still
looks like a good possibility for many areas later tonight.
Visibilities and/or ceilings could even dip into LIFR in spots,
particularly more fog-prone areas. Once this burns off in the morning
VFR conditions will build in for the remainder of the period.


.EAX Watches/Warnings/Advisories...


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