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

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FXUS63 KEAX 250509
AFDEAX

Area Forecast Discussion
National Weather Service Kansas City/Pleasant Hill MO
1209 AM CDT WED MAY 25 2016

.Discussion...
Issued at 404 PM CDT TUE MAY 24 2016

The active pattern will continue as southwest flow aloft enters the
region this afternoon ahead of a broad longwave trough positioned
over the west coast. Early morning convection has stabilized the
environment, and given the lack of any near-term forcing or
triggering mechanisms in place for afternoon convection, have
reduced pops through the remainder of the afternoon and early
evening hours. Though there remains some uncertainty as to how
things will develop overnight, expecting to see storms merging into
an MCS over NW Kansas, move into the area after midnight. Lee-side
low pressure will develop by late this evening over western Kansas,
with a dryline running south into the Texas Panhandle. Models are
still in disagreement as to the timing and position of overnight
convection, though generally thinking that storms will fire
along the dryline over SW Kansas and begin to merge as they cross
into central Kansas. Several factors will be at play here, which
could lead to the potential for flash flooding, particularly for NW
Missouri. The surface low will propagate to the NE ahead the low-
level jet overnight throughout north central Kansas. This will occur
in an area of increased precipitable water values, approximately
150% of normal. An effective warm front draped over the KS/NE
border, combined with an eastward storm motion parallel with the
boundary could lead to training storms along this boundary as it
approaches NW Missouri. The aforementioned, couple with a weak
shortwave on the crest of an eastward moving ridge over this area
will produce a possible Maddox frontal type event tonight.
Considering there is some uncertainty in how things come together,
the potential is certainly present for overnight flash flooding as
the MCS enters the western CWA.

Much of what then develops Wednesday morning will depend on
overnight activity, though the environment will be more supportive
of severe potential, particularly along any outflow boundaries
present. Moderate instability and more supportive deep layer shear
compared to previous days will ripen the possibility of large hail
and strong to damaging winds Wednesday morning and afternoon. This
will again depend on how stable the environment is and whether or
not it can recover from morning convection.

Similar conditions will persist Thursday as the surface low
approaches north central Kansas by Thursday morning. Upper-level
dynamics will continue to support severe weather chances Thursday
afternoon, particularly for areas north of I-70 as 0-6km shear
values approach 40+ knots. The upper-level trough will then approach
western Kansas by Friday before weakening as it approaches SW Iowa
into Saturday. As a result, thunderstorm chances will continue into
the weekend, with perhaps a break in the activity Sunday as mid-
level ridging begins to build over the area. The active pattern will
then continue early next week as another deepening trough settles
over the southwestern CONUS.

&&

.Aviation...(For the 06Z TAFS through 06Z Wednesday Night)
Issued at 1210 AM CDT WED MAY 25 2016

Widespread thunderstorm activity will move through the region between
06-09z as activity from central Kansas spreads eastward. This
activity will likely result in MVFR and possibly brief IFR
restrictions. The overall severe threat appears to be diminishing
however variable winds with gusts to 35 kts will be possible.
Shwrs/storms to continue through much of the night as the low-level
jet increases during the early morning hrs. Low cigs in the MVFR
range look to make a return after 12z...with categorical improvements
back to VFR expected by early afternoon. Another round of
shwrs/storms will be possible late in the fcst period however low
confidence precludes mention for the time being.

&&

.EAX Watches/Warnings/Advisories...
KS...None.
MO...None.
&&

$$

Discussion...Welsh
Aviation...32



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