142 
FXUS63 KOAX 201108
AFDOAX

Area Forecast Discussion
National Weather Service Omaha/Valley NE
508 AM CST Fri Nov 20 2020

...Updated Aviation Forecast Discussion...

.DISCUSSION...
Issued at 341 AM CST Fri Nov 20 2020

Satellite this morning showing near-zonal flow across the CONUS with 
just a smattering of clouds over the central Plains. At the surface 
a strong thermal boundary extended from low pressure centered over 
the western Great Lakes region to roughly southwestern KS. Just 
ahead of the front the environment was rather moist with Td in the 
Low 50 over northern/western MO and eastern KS. 

Today through Sunday night

The large scale pattern will see little change over the next several 
days with the brunt of upper disturbances rushing along the U.S./Can 
border. However a series of minor impulses moving across the 
central Plains will combine with increasing isentropic glide to 
allow for scattered rain activity Saturday afternoon. Moisture 
return will be restricted though and any accumulations will be on 
the light side by events end Saturday night. 

Monday through Thursday

As an upper ridge exits the region increasing DPVA associated with 
an approaching upper trough will induce leeside cyclogenesis over
northeast CO. Southerly flow ahead of the low is progged to draw 
generous amounts of gulf moisture northward and phase with the 
increasing synoptic scale lift to allow for precip activity to 
develop over the central Plains. Given the generous return 
moisture will be on hand to tap the potential for relatively 
locally heavy rainfall will increase as well. Surprisingly so for
this time of the year the environment is progged to overall be 
more supportive for rain with a brief periods of rain/snow mix 
here and there Monday into Tuesday night. Increasing heights will 
lead to a dry weather then Wednesday and Thursday. 

Today - mid/upper 50s
Sat - upper 40s 
Sun - upper 40s/low 50s
Mon - mid/upper 40s 
Tue - upper 40s/low 50s
Wed - low/mid 50s
Thu - upper 40s/low 50s 

&&

.AVIATION...(For the 12Z TAFS through 12Z Saturday morning)
Issued at 507 AM CST Fri Nov 20 2020

A surface ridge will build into the area today and tonight. North
winds today could approach 10-12 kt at KOMA and KLNK before 
weakening and veering to northeast tonight. A band of mid and 
high-level cloudiness (at or above FL100) stretching from the 
central Rockies into the mid MO Valley will persist today with a 
general increase in clouds expected at KOMA and KLNK this morning.

&&

.OAX WATCHES/WARNINGS/ADVISORIES...
NE...None.
IA...None.
&&

$$

DISCUSSION...DEE
AVIATION...Mead