Area Forecast Discussion
Issued by NWS Omaha/Valley, NE

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FXUS63 KOAX 130845

Area Forecast Discussion
National Weather Service Omaha/Valley NE
245 AM CST Wed Dec 13 2017

.SHORT TERM...(Today through Friday)
Issued at 245 AM CST Wed Dec 13 2017

A potent short-wave trough over the northern High Plains early
this morning will track southeast through the mid-MO Valley today
in tandem with a surface cold front. Similar to past systems, this
disturbance will be interacting with a relatively dry air mass
with measurable precipitation chances seemingly quite low. A few
sprinkles will be possible this morning into early afternoon,
namely over portions of northeast NE into southwest IA.

Winds will become quite strong from the northwest by mid morning
with the gradient slowly relaxing by late afternoon into this
evening. Sustained winds of 30-35 mph with gusts to 40-45 mph
appear likely and we have extended the wind advisory to include
the Omaha metro area as well as all of our southwest IA counties.
High temperatures should top out in mid 40s north to mid 50s south
by early afternoon with readings slowly falling thereafter. It
appears that we will see a few-hour window of high to very high
fire danger develop early this afternoon from the Columbus area
south through Lincoln and Beatrice and points west.

Tonight into Thursday, yet another short-wave trough will
translate from the northern High Plains into the region. Clouds
should thin some tonight before thickening again on Thursday in
response to strengthening forcing for ascent. The extent of
cooling overnight will have implications on high temperatures on
Thursday, which in turn, will dictate snowfall accumulation
potential. Highest precipitation chances will be over the western
half of the forecast area, in closer proximity to the approaching
mid-level wave. We will continue to indicate snowfall amounts of
generally less than a half inch from the Platte River into
northeast NE. However, should temperatures on Thursday end up
colder than the mid to upper 30s we are currently forecasting, the
potential will exist for some local accumulations of an inch or

Thursday night into Friday, any light precipitation will shift to
the southeast of the area Thursday evening with strengthening
westerly low-level winds allowing temperatures to rebound back
into the 40s on Friday.

.LONG TERM...(Friday night through Tuesday)
Issued at 245 AM CST Wed Dec 13 2017

Latest medium-range guidance remains relatively consistent in
depicting a short-wave trough tracking through the northern
Intermountain Region Saturday with one piece of the system
shearing east across the northern Plains on Sunday, while the
other part develops south into the Four Corners. An associated
cold front will advance through the area on Saturday with some
potential for light precipitation later Saturday into early
Sunday. By the early to middle part of next week, it appears that
we will at least temporarily transition back to a trough in the
east and ridging in the west. Resultant northwest deep-layer flow
across the Plains translates to continued above-normal


.AVIATION...(For the 06Z TAFS through 06Z Wednesday night)
Issued at 1122 PM CST Tue Dec 12 2017

A cold front will move through eastern Nebraska early Wednesday
with strong northwest winds developing by 12-15z and continuing
into evening. LLWS will exist along and just ahead of the front
at all TAF sites before diminishing with the onset of deeper
mixing. Mid and high-level cloudiness will increase through the
day with prevailing VFR conditions. Model guidance does indicate
an increasing probability of MVFR stratus or strato-cumulus to the
east of KOFK and KOMA. Model trends and observations will have to
be monitored for the potential impact of these clouds at those
two TAF sites.


NE...Wind Advisory from 9 AM this morning to 5 PM CST this
afternoon for NEZ011-012-015>018-031>034-043>045-051>053-067.

IA...Wind Advisory from 9 AM this morning to 5 PM CST this
afternoon for IAZ043-055-056-069-079-080-090-091.



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