108  
FXUS65 KSLC 230318  
AFDSLC  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE SALT LAKE CITY UT  
918 PM MDT FRI SEP 22 2017  
   
SYNOPSIS
 
AN UPPER LOW OVER NORTHERN NEVADA WILL HEAD SOUTHEAST  
INTO SOUTHERN UTAH LATE SATURDAY, THEN TURN NORTHEAST TOWARDS  
WYOMING LATE IN THE WEEKEND. ANOTHER LOW MAY IMPACT UTAH MIDWEEK.  
 

 
   
DISCUSSION
 
A LATE FALL-LIKE WEATHER PATTERN REMAINS IN PLACE  
ACROSS THE STATE THIS EVENING. SEVERAL LOCATIONS REPORTED RECORD  
LOW MAXIMUM TEMPERATURES AND EVEN A DAILY SNOWFALL RECORD. BRIGHAM  
CITY AND THE SALT LAKE TRIAD CENTER BOTH REPORTED RECORD LOW  
MAXIMUMS FOR THE ENTIRE MONTH OF SEPTEMBER. SO, NEEDLESS TO SAY,  
THIS IS AN ANOMALOUS PATTERN FOR LATE SEPTEMBER.  
 
AN UPPER LEVEL LOW OVER THE WESTERN GREAT BASIN WILL GRADUALLY  
SHIFT SOUTH AND THEN EAST OVER THE WEEKEND. AS THE MAIN SHORTWAVE  
ROUNDS THE BASE OF THE TROUGH LATER SATURDAY, THE UPPER LEVEL LOW  
WILL FINALLY LIFT OUT OF THE AREA BY LATER SUNDAY.  
 
EXPECT A FAIRLY SUBSTANTIVE WRAP AROUND EVENT ACROSS PORTIONS OF  
UTAH SATURDAY EVENING INTO SUNDAY EVENING, WITH THE POTENTIAL FOR  
A FEW OF THE SUMMITS ALONG I-15 NEAR THE COVE FORT/BEAVER AREA TO  
SEE THEIR FIRST ACCUMULATING SNOW OF THE YEAR SATURDAY NIGHT.  
CURRENT SNOW TOTALS LOOK TO BE NEAR ADVISORY AMOUNTS FOR MOST  
MOUNTAIN AREAS AND POTENTIALLY FOR THE PREVIOUSLY MENTIONED SUMMIT  
AREAS. WILL LET THE MID SHIFT DETERMINE ANY POTENTIAL HEADLINES  
WITH THE NEWEST MODEL RUNS FOR THE MORNING PACKAGE.  
 
BIGGEST ISSUES TONIGHT ARE THE POTENTIAL FOR A HARD FREEZE IN SOME  
OF THE COLDER VALLEY LOCATIONS AS WELL THE POTENTIAL FOR DENSE  
FOG IN SOUTHWESTERN UTAH. CURRENT TEMPERATURES INDICATE MIXING HAS  
BEEN ADEQUATE TO KEEP TEMPERATURES ELEVATED IN AREAS LIKE CEDAR  
CITY AND LOGAN. STILL THINK TEMPERATURES WILL FALL TO NEAR  
FREEZING IN LOCATIONS LIKE CEDAR CITY AND LOGAN. HOWEVER, PARK  
CITY IS THE ONE SPOT THAT SEEMS TO BE QUICKLY COOLING OFF...WITH  
TEMPERATURES ALREADY IN THE MID 30S. ANYONE WITH GARDEN CONCERNS  
IN THE MOUNTAIN VALLEYS SHOULD COVER OR BRING THEIR PLANTS INSIDE  
TONIGHT AS A HARD FREEZE IS POSSIBLE FOR THE WASATCH BACK. CLOUD  
COVER MAY KEEP TEMPERATURES FROM FULLY FALLING TO THE UPPER 20S,  
SO WILL HOLD OFF ON ANY HEADLINES FOR NOW. GIVEN THE GRADIENT,  
DENSE FOG SEEMS UNLIKELY FOR SOUTHWEST UTAH BUT A FEW POCKETS OF  
FOG CAN'T BE RULED OUT.  
 
UPDATED POPS TO BETTER REFLECT CURRENT TRENDS. NO ADDITIONAL  
UPDATES ARE ANTICIPATED.  
 

 
   
AVIATION
 
NORTH TO NORTHWEST WINDS WILL PREVAIL AT THE SLC  
TERMINAL THROUGH THE EVENING BEFORE SWITCHING BACK TO THE SOUTH  
AROUND 05Z.  
 

 
   
SLC WATCHES/WARNINGS/ADVISORIES
 
 
UT...NONE.  
WY...NONE.  

 
 

 
 
KRUSE  
 
FOR MORE INFORMATION FROM NOAA'S NATIONAL WEATHER SERVICE VISIT...  
HTTP://WEATHER.GOV/SALTLAKECITY  
 
FOR FREQUENTLY ASKED QUESTIONS ABOUT THE AREA FORECAST DISCUSSION  
VISIT...  
HTTP://WEATHER.GOV/SALTLAKECITY/GENERAL/AFD_FAQS.PHP  
 
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