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

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FXUS63 KEAX 261722

National Weather Service Kansas City/Pleasant Hill MO
1222 PM CDT Mon Jun 26 2017

Issued at 313 AM CDT MON JUN 26 2017

Scattered shwrs beginning to develop across east-central Kansas
this morning is modest isentropic ascent and weak frontogenesis
interact with an area of low-level moisture convergence. So far
this activity has been in shwr form, and considering the lack of
any appreciable instability this morning per latest SPC meso page,
we expect this trend to continue through sunrise. Further to our
north, precip developing nicely across portions of Iowa and
Nebraska as the next inbound shortwave dives southeast towards our
area. As a result, expect precip to gradually expand in coverage
as the wave inches closer to our region, and have increased pops
up along the Iowa border this morning to account for this
development. Later today, fcst models continue to show additional
activity developing across northern Missouri as a weak surface
boundary starts moving into the region from the north. Inspection
of several fcst soundings again yields very weak instability this
afternoon with MLCAPE values generally less than 800 Joules. As
such, expect any developing storm activity along this feature to
remain below severe thresholds with activity gradually coming to
an end this evening from north to south. Afternoon highs today
will remain below normal, with mid & upper 70s expected. It
shouldn`t be a washout but shwrs/isolated storms will definitely
be on the radar through a good portion of the day.

High pressure to temporarily build south into our region tonight
with dry conditions expected through much of Tuesday and Tuesday
night. Southerly winds will begin to become re-established later
in the day on Tuesday as high pressure begins sliding off to our
east and pressure falls occur across the central and northern High
Plains. As a result, Tuesday`s highs will be a few degrees warmer
than today`s, with highs topping out in the lower 80s.

Big changes on the way by Wednesday as a very unsettled weather
pattern develops over the Nation`s midsection. Main culprit
continues to be a strong ridge of high pressure across the north-
central Atlantic, which will lead to a general blocking pattern
upstream across North America. As this occurs, a trough of low
pressure is expected to descend into southern Canada & the
Northern Plains, with this feature having little chance for
eastward progression until the end of the work week. Meanwhile
closer to the surface, western Atlantic high pressure combined
with a trough of low pressure across the Great Plains will lead to
healthy return flow up through the upper Miss Rvr Vly. Low/mid 70
degree dewpoints combined with passing shortwaves and eventually
a stalled frontal boundary will lead to several rounds of showers
and storms through the end of the week, with the heavy rain threat
looking more ominous with each passing model run. By week`s end,
several locations could be looking at rainfall totals in excess of
2-4 inches, especially across far northern Missouri.

Upper low is finally able to start moving east later in the day
on Friday which should drag a trialing cold front through our
area. This will result in return to dry weather for through
Saturday, with rain chances again increasing by Sunday as another
front stalls across our region.


.Aviation...(For the 18Z TAFS through 18Z Tuesday Afternoon)
Issued at 1222 PM CDT MON JUN 26 2017

A line of showers and embedded thunderstorms is expected to push
through the terminals in the early part of the TAFs. This feature
will push south of the area by the late afternoon with mostly
clearing skies and a E-NE wind at 5-10kts. The light winds, mostly
clear skies, and wet ground conditions overnight all point to
potential visibility issues along the Missouri River area from
KSTJ to KMCI where most the rainfall occurred today. Currently
widespread MVFR visibilities will persist in this region and
isolated IFR visibilities are possible if enough cooling occurs
overnight. These visibilities would rise quickly after sunrise as
this fog bank will be relatively shallow.




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