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Office: SLC FLUS45 KSLC 140134 HWOSLC Hazardous Weather Outlook National Weather Service Salt Lake City UT 634 PM MST Wed Dec 13 2017 UTZ001>016-019>021-517-518-WYZ021-141315- Cache Valley/Utah Portion-Northern Wasatch Front- Salt Lake and Tooele Valleys-Southern Wasatch Front- Great Salt Lake Desert and Mountains-Wasatch Mountain Valleys- Wasatch Mountains I-80 North-Wasatch Mountains South of I-80- Western Uinta Mountains-Wasatch Plateau/Book Cliffs- Western Uinta Basin-Castle Country-San Rafael Swell- Sanpete/Sevier Valleys-West Central Utah-Southwest Utah- Utahs Dixie and Zion National Park-South Central Utah- Glen Canyon Recreation Area/Lake Powell-Central Mountains- Southern Mountains-Southwest Wyoming- 634 PM MST Wed Dec 13 2017 This Hazardous Weather Outlook is for the western two thirds of Utah and southwest Wyoming. .DAY ONE...Tonight Patchy fog will remain in place across the northern and central Wasatch Front, the Cache and Bear Lake valleys, and over portions of the northwest desert including the I-80 corridor. The fog may become locally dense at times late tonight. Strong and gusty northerly canyon winds will develop across Washington County overnight. These winds may impact travel along the I-15 corridor through that area. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday Inversion conditions will continue through at least Friday. Expect areas of fog to persist across many of the lower northern valleys through the end of the week. Urban haze and poor air quality will also continue through Friday due to the strong and persistent valley inversions across northern Utah. The next real chance to scour out the fog and haze will come Friday night through Saturday. A weather disturbance approaching from the northwest will likely bring enough wind and colder air aloft to significantly break down the inversions and push fog and haze out of the area. In addition, accumulating snow is expected across the mountains of northern Utah with this system, with perhaps an inch or two in the valleys as well. .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to report significant weather conditions according to standard operating procedures. $$ For more information from NOAA/s National Weather Service visit... For information on potential road travel impacts visit...