501  
FXUS65 KSLC 230430  
AFDSLC  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE SALT LAKE CITY UT  
930 PM MST TUE JAN 22 2019  
   
SYNOPSIS
 
HIGH PRESSURE WILL REMAIN CENTERED OFF THE PACIFIC  
COAST OVER THE NEXT SEVERAL DAYS. A SERIES OF WEAK STORM SYSTEMS  
WILL MOVE OVER THE TOP OFF THIS RIDGE INTO UTAH AND SOUTHWEST  
WYOMING THROUGH THE END OF THE WEEK, BRINGING LIGHT MOUNTAIN SNOW  
ACCUMULATIONS AND TEMPERATURES NEAR SEASONAL NORMALS.  
 

 
   
DISCUSSION
 
UTAH REMAINS UNDER A NORTHWESTERLY FLOW ALOFT THIS  
EVENING IN BETWEEN A MEAN LONGWAVE TROUGH OVER THE CENTRAL CONUS AND  
A RIDGE OFF THE WEST COAST. A WEAK SHORTWAVE TROUGH IS NOTED ON  
WATER VAPOR IMAGERY RIDING OVER THE TOP OF THE RIDGE AND IS  
CURRENTLY OVER THE SOUTHERN BRITCOL COAST. WARM ADVECTION HAS  
DEVELOPED AT 700MB ACROSS NORTHERN UTAH AND WILL STRENGTHEN THROUGH  
THE NIGHT. CURRENTLY, UTAH IS UNDER MOSTLY CLEAR SKIES, WITH A FEW  
SMALL PATCHES OF STRATUS OVER CENTRAL UTAH AND SOME HIGH CLOUDS  
DRIFTING ACROSS NORTHERN UTAH AND SOUTHWEST WYOMING.  
 
EXPECT STABLE CONDITIONS TO CONTINUE THROUGH THE NIGHT WITH MID AND  
HIGH CLOUDS CONTINUING TO INCREASE AHEAD OF THE AFOREMENTIONED  
SHORTWAVE TROUGH. PRECIPITATION SHOULD DEVELOP TOWARDS THE MORNING  
HOURS ACROSS THE FAR NORTH, WHILE REMAINING IN A WARM ADVECTION  
NORTHWESTERLY FLOW. THE TRANSITION TO COLD ADVECTION WILL OCCUR  
DURING THE LATE AFTERNOON THROUGH EARLY EVENING HOURS AS THE TROUGH  
BEGINS TO MAKE ITS WAY INTO NORTHERN UTAH. THE ASSOCIATED  
PRECIPITATION WILL THEN SPREAD SOUTH AND MAKE ITS WAY INTO CENTRAL  
UTAH. THE AIRMASS WILL REMAIN COLD ENOUGH TO KEEP PRECIPITATION IN  
THE FORM OF SNOW. AMOUNTS WILL REMAIN LIGHT WITH THE BULK OF IT  
FALLING OVER THE MOUNTAINS.  
 
THE LARGE-SCALE PATTERN WILL REMAIN LARGELY UNCHANGED THROUGH THE  
WEEKEND, AS UTAH WILL REMAIN UNDER A NORTHWESTERLY FLOW ALOFT WITH  
WEAK DISTURBANCES CONTINUING TO CROSS THE AREA.  
 
CURRENT FORECAST IN GOOD SHAPE. NO UPDATES THIS EVENING.  
 

 
   
AVIATION
 
OPERATIONAL WEATHER CONCERNS WILL REMAIN MINIMAL AT THE  
KSLC TERMINAL THROUGH TONIGHT. SOUTHEAST WINDS WILL PREVAIL THROUGH  
THE NIGHT AND ARE LIKELY TO PERSIST THROUGH THE DAY TOMORROW.  
CEILINGS WILL BEGIN TO FILL AND LOWER AFTER 12Z WEDNESDAY, LIKELY TO  
OR BELOW 6000FT AGL BY 14Z.  
 

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

 
 

 
 
CHENG  
 
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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