Area Forecast Discussion
Issued by NWS Omaha/Valley, NE

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FXUS63 KOAX 222234

Area Forecast Discussion
National Weather Service Omaha/Valley NE
534 PM CDT Sat Sep 22 2018

.SHORT TERM...(Tonight through Tuesday)
Issued at 307 PM CDT Sat Sep 22 2018

WV/IR imagery this afternoon showing fast zonal flow along the
U.S./Canada border. At the surface a wedge of high pressure was
extended from the Great lakes region into the central Plains.

Models are showing going forecast for upcoming precip event is on

Large scale pattern will amplify over the next couple days in
response to a Pacific NW trof digging across the northern/central
Rockies. Attendant cold front is progged to move into the northern
CWA on Monday with precip activity breaking out along the boundary
during the afternoon hours then gradually expand southward over
the rest of the CWA. Appears that sufficient mid layer
ageostrophic forcing will be present to maintain precip into
Tuesday afternoon. As of now both NAM12/GFS20 show adequate deep
shear and instability will be in place for the possibility of a
few severe storms along/south of I-80.

Cold air advection with this front will take highs from the mid 70s
on Sunday to the upper 60s by Wednesday.

.LONG TERM...(Tuesday night through Saturday)
Issued at 307 PM CDT Sat Sep 22 2018

Another cold front passage late next week will mean possible precip
Wednesday night and Thursday. QG forcing looks minimal at best
though so will maintain small POPs. Otherwise push of cold air
advection with this boundary front will keep highs in the below
normal range with upper 60s/lower 70s expected.


.AVIATION...(For the 00Z TAFS through 00Z Sunday evening)
Issued at 535 PM CDT Sat Sep 22 2018

Expect VFR conditions through the period. Patchy fog possible
toward sunrise but will not mention in TAFs at this time.




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