Area forecast discussion 
National Weather Service Omaha/valley NE 
1125 PM CST Thu Dec 8 2016 

Short term...(tonight through sunday) 
issued at 257 PM CST Thu Dec 8 2016 

Early-afternoon water vapor imagery depicted broad cyclonic flow 
east of The Rockies with chiefly a zonal regime present across 
the interior west. This quasi-zonal flow pattern will migrate east 
into the Great Plains tomorrow (fri) into Saturday, while in the 
low levels, a ridge axis shifts to our east in deference to Lee 
cyclone formation over the Central High plains. 

Tonight, clear skies coupled with light winds attendant to the 
transient surface ridge will yield ideal radiational cooling 
conditions with lows dipping to near zero across the north and 
single digits south. On Friday, strengthening warm advection and 
isentropic ascent along the 285-290k surfaces will Foster an 
increase in clouds with flurries possible across the north. The 
cold start to the day and increasing clouds will result in highs 
only in the upper teens to lower 20s. 

On Saturday, the response to a low-amplitude perturbation 
tracking across the northern plains will result in strengthening 
low-level warm advection with temperatures warming into the lower 
to mid 30s across central and southern portions of the forecast 
area. Over northeast Nebraska and west-central Iowa, the warm 
advection in conjunction with frontogenetical forcing will 
contribute to an increased chance of accumulating snow. 
Variability exists in 12z model guidance with respect to snowfall 
totals and where the swath of heaviest snow will develop. 
Currently, it appears that up to an inch or two is possible, 
mainly across Knox and Cedar counties. 

After a brief reprieve Saturday night, the chance of snow will 
increase across the entire forecast area on Sunday as large-scale 
forcing for ascent strengthens in association with a short-wave 
trough amplifying over the mid Missouri Valley. Here too, the 
models remain quite dispersive in quantitative precipitation forecast amounts and distribution 
with a dusting to a couple of inches of snow possible Sunday into 
Sunday night. 

Long term...(sunday night through thursday) 
issued at 257 PM CST Thu Dec 8 2016 

An amplifying polar-branch trough in the Lee of the Canadian 
rockies will hasten the equatorward surge of another mass of 
Arctic air into the mid Missouri Valley Monday night into Tuesday. 
A low-probability chance of light snow will exist with the frontal 
passage with highs on Tuesday struggling to climb into the teens 
to lower 20s. Though some air mass moderation will occur through 
the middle of next week, temperatures will remain well below 


Aviation...(for the 06z tafs through 06z Friday night) 
issued at 1124 PM CST Thu Dec 8 2016 

VFR conditions through the period. Clouds will thicken through the 
day Friday, and could see scattered flurries near kofk 20-24z. 


Oax watches/warnings/advisories... 


Short term...Mead 
long term...Mead 

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