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

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FXUS63 KEAX 220847
AFDEAX

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE KANSAS CITY/PLEASANT HILL MO
347 AM CDT Wed Apr 22 2015

.DISCUSSION...
Issued at 347 AM CDT WED APR 22 2015

For today, cooler temperatures are expected in the wake of a cold
front which passed through the region late last evening. Highs may
struggle to reach 60 degrees; however, diminishing north winds and
sunshine should help take the edge off the below normal temperatures
in all but far northeastern portions of the CWA. Patchy frost is
possible again tonight as surface high pressure builds into the
region, especially across far northern and northeast MO where nearly
calm winds are expected by daybreak and temperatures will be coldest
aloft.

Quiet conditions will continue into Thursday, when temperatures
should begin to warm under light but veering surface winds and zonal
flow aloft. The main focus; however, will be Friday and Friday night
when a shortwave trough lifts out of the four corners region and
into the central Plains, and a resultant surface low kicks out into
central KS.

Widely scattered, elevated storms are expected to develop ahead of
the deepening surface low by midday Friday, limiting the potential
instability that can develop by Friday afternoon and evening when
the surface warm front begins to lift into central KS and west
central MO. However, the potential for storms to develop along the
warm front is still high due to very strong synoptic-scale dynamics
associated with the shortwave trough and upper jet. MUCAPE values
during the late afternoon and evening are generally 500 J/kg or less
in our CWA, but will be coincident with 0-3 km helicity values of
400-500+ m2/s2 near the warm front, spelling a fairly classic high
shear/low CAPE setup for areas near the boundary. Low-topped
supercells are possible from late afternoon through the overnight
and early morning hours, due to continued strong dynamics and the
likelihood of the boundary layer remaining mixed overnight.

Areas that see strong to severe storms will be almost entirely
dependent on how far north the warm front can lift Friday evening,
especially since morning/early afternoon convection should not
significantly impact the potential for storms later in the day.
Model solutions still differ on the position of the surface low, and
to a lesser degree its timing, but both the NAM and GFS bring the
warm front up to the KC metro area prior to 06z Saturday, and the
EC`s more southern track is not significantly different, bringing
the front just south of the metro before lifting it out to the east.
Areas north of the warm front could see isolated, elevated strong to
severe storms during the evening and overnight hours, but the threat
will be considerably less as the environment quickly becomes less
supportive south to north. Heavy rain may also be a concern with
this system in areas that see several rounds of storms both in the
morning and again along the boundary, especially if cells begin to
train along the front.

Showers will likely wrap in behind the surface low on Saturday, but
whether or not those impact the majority of the CWA will depend on
how the surface low exits the region -- a more northeasterly track
would keep the majority of the area dry on Saturday, while the more
southern EC solution drags rain showers through the entirely of the
forecast area. Otherwise, seasonable temperatures and a few quick
shots of light showers or isolated storms are expected through the
remainder of the long-range forecast.


&&

.AVIATION...(For the 06Z TAFS through 06Z Wednesday Night)
Issued at 1135 PM CDT TUE APR 21 2015

VFR conditions will continue through the period. Surface high
pressure to the northwest will bring persisting northerly winds
around 7-9 kts through Wednesday. A scattered cloud layer around 10
kft will continue to move over the area as northwest flow aloft
continues.


&&

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

$$

DISCUSSION...Laflin
AVIATION...Welsh





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