Area Forecast Discussion
Issued by NWS Omaha/Valley, NE

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FXUS63 KOAX 272018

Area Forecast Discussion
National Weather Service Omaha/Valley NE
318 PM CDT Mon Mar 27 2017

.SHORT TERM...(Tonight through Thursday)
Issued at 317 PM CDT Mon Mar 27 2017

Lucky people in northeast NE are getting glimpses of the sun, while
the rest of us remain socked in under stratus. Subjective 12Z upper-
air analysis indicates an upper-level trough over MO/AR toward
Arklatex, with another trough upstream over CA/NV toward the Pacific
Northwest. Pattern is overall rather weak and wavy, with several
shortwave ripples and lacking an upper-level jet stronger than
100kt. The 850mb low was centered in eastern KS/northwest MO, with
0C+ dewpoints wrapped around from the Great Lakes toward
central/western NE and western CO.  Little cold air was noted behind
the low, with a thermal ridge in the western US.  Surface low at 19Z
was centered in southern MO/northern AR, with lee troughing already
developing and with surface ridge axis from MN into eastern
NE/eastern KS.

Main forecast concerns are what locations may see the sky and for
how long, followed by a return of rain on Tuesday night. Clouds have
eroded from SD into northeast NE, while stratus are hanging on from
KLCG to KOLU and east/south.  As surface winds veer to more
easterly, along with loss of daylight, it`ll be hard to erode that
cloud deck much further. Expect that the clouds will back into the
area this evening, as supported by low-level RH progs among model
solutions. Have kept us locked in stratus particularly in the
eastern to southern CWA, with some break in the northeast to east
central CWA before clouds re-invade. Could see some erosion also in
the northern to northwestern CWA on Tuesday during the day, but
moisture fetch does not support erosion in the same eastern to
southern CWA area.

Upper low is progged to roll across the southern Plains on Wednesday
and Thursday, bringing increasing rain chances. With low so far
south, the instability also should remain south of the CWA, and have
continued to keep thunder out of the forecast.  Forecast indicates
little temperature change from lows to highs Tuesday night through
Wednesday, which is reasonable given clouds and rain.  Given slow-
moving nature of low, many areas could see over an inch of much-
needed rain from Tuesday night through Thursday.

.LONG TERM...(Thursday night through Monday)
Issued at 317 PM CDT Mon Mar 27 2017

After that next round of rain and continued clouds, respite arrives
Thursday night and Friday with at least a break in rain chances.
Optimistically, could see clouds break, too ... but then again, with
northeast to easterly low-level winds and a fair amount of low-level
moisture, hesitate to get too optimistic.  The active upper-level
pattern reloads for Saturday and Sunday, but as one would expect,
model differences on the track of the weekend low present a wider
envelope and thus lower confidence in details such as thunder
potential and precipitation extent. Still do think airmass will be
too warm for rain, though on the cool side as long as we remain on
the north side of the ejecting trough/low.  Another break behind the
low should provide respite again on Monday.


.AVIATION...(For the 18Z TAFS through 18Z Tuesday afternoon)
Issued at 1156 AM CDT Mon Mar 27 2017

A deep-layer cyclone analyzed over central MO as of late morning
will continue east today, allowing a surface ridge to build into
the mid MO Valley from the north. This ridge axis is comprised of
a drier low-level air mass, and based on visible satellite trends,
it appears that MVFR ceilings will become scattered at KOFK this
afternoon. We are a bit more uncertain about this occurring at
KOMA and KLNK, so we will maintain gradually rising MVFR ceilings
at those locations. Otherwise, expect light north or northeast
winds to become east late tonight into Tuesday morning.




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