062 
FXUS65 KSLC 170440
AFDSLC

Area Forecast Discussion
National Weather Service Salt Lake City UT
940 PM MST Mon Dec 16 2019

.SYNOPSIS...High pressure will build across the state for the 
first half of the week. A mainly dry cold front will cross the
state Thursday. High pressure will build back into the area for
the early part of the weekend.

&&

.DISCUSSION...A strongly amplified ridge is building into the 
western CONUS this evening while the last of the shortwave troughs 
from the latest storm cycle exits into Colorado. With large scale 
subsidence and clearing skies in the wake of the trough, expect a 
cold night across most areas tonight. Patchy fog will be possible 
overnight, mainly in some of the colder and more enclosed northern 
Utah valleys such as the Cache Valley, Bear River Valley, and 
portions of the Wasatch Back. Besides the cold and fog, the only 
other real weather worth mentioning would be localized gusty canyon 
winds in Washington County tonight given favorable northeasterly 
gradient and 700mb cold advection. However, these winds are not 
expected to be strong enough to cause enough concern to warrant any 
wind highlights. 

The high pressure settling into the area tomorrow will set up valley 
inversions. The inversions may weaken a bit late Wednesday owing to 
a weak and fast-moving trough. Although very little if any 
precipitation will accompany the trough, temperatures at 700mb are 
progged to lower to -10C. After that, high pressure will build back 
into the area leading to stable conditions and valley inversions 
through at least Friday.

Updated the forecast for minor adjustments to Sky cover and to add 
mention of fog. 

&&

.AVIATION...VFR conditions are expected to persist at the SLC 
terminal through the TAF period. Light north winds below 5 knots 
should become calm or light southeast by 06Z. 

&&

.SLC WATCHES/WARNINGS/ADVISORIES...
UT...None.
WY...None.
&&

$$

Cheng/Billingsley

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