Area Forecast Discussion
Issued by NWS Omaha/Valley, NE

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FXUS63 KOAX 080909

Area Forecast Discussion
National Weather Service Omaha/Valley NE
309 AM CST Fri Dec 8 2017

.SHORT TERM...(Today through Sunday)
Issued at 309 AM CST Fri Dec 8 2017

A positively tilted, multi-stream trough from Ontario to northwest
Mexico will advance southeast in response to the progression of an
upstream perturbation from northern Manitoba into the upper-MS
Valley today and the mid-MS/lower-OH Valleys tonight. In the low
levels, a cold front will move through the area this morning along
with increasing low to mid-level clouds. Radar data as of 09z
indicate increasing reflectivities aloft, along the leading edge
of denser cloud cover. While a few morning flurries are possible,
the presence of a dry low-level environment will result in the
sublimation of most of the falling precipitation.

The post-frontal cold advection coupled with the increasing clouds
will limit daytime heating with today`s highs in the mid to upper
30s. Tonight into Saturday, our area is only glanced by the next
surge of colder low-level air associated with the Manitoba-MS
Valley disturbance mentioned above. Highs on Saturday will range
from around 30 to the lower 30s in our IA counties to upper 30s to
around 40s across the counties in the western part of our area.

By Sunday, mid-level heights will build slightly with
considerable low-level warm advection translating to afternoon
temperatures warming into the 50s.

.LONG TERM...(Sunday night through Thursday)
Issued at 309 AM CST Fri Dec 8 2017

Sunday night into Monday, a short-wave trough and related upper-
level jet streak will progress from the lee of the Canadian
Rockies through the mid-MO Valley in conjunction with a strong
surface cold front. Similar to this past Monday, we could see
early-day highs being reached with temperatures falling through
the afternoon with strong northwest winds.

We will remain on the western periphery of a broad long-wave
trough through the upcoming work week with the coldest low-level
air remaining to our east. In general, highs will be near or
slightly above normal with continued dry conditions.


.AVIATION...(For the 06Z TAFS through 06Z Friday night)
Issued at 1133 PM CST Thu Dec 7 2017

Generally VFR conditions at the TAF sites, although MVFR clouds
could develop at KOFK 14-17z. Could also be a snow flurry or two
at KOFK 08-10z. Winds at KOFK also increase to 11 to 20 knots by
14z, and up to 12 knots at KLNK/KOMA by 15z.




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