239  
FXUS65 KSLC 160332  
AFDSLC  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE SALT LAKE CITY UT  
932 PM MDT WED AUG 15 2018  
   
SYNOPSIS
 
HIGH PRESSURE WILL REMAIN CENTERED OVER THE SOUTHERN  
ROCKIES THROUGH FRIDAY NIGHT. AN UPPER LEVEL WEATHER DISTURBANCE  
MOVING EAST ACROSS THE NORTHERN ROCKIES WILL BRING COOLER AND  
DRIER AIR TO AREA THIS WEEKEND.  
 

 
   
DISCUSSION
 
FAIRLY WIDESPREAD CONVECTION DEVELOPED THIS  
AFTERNOON AND EVENING ACROSS PORTIONS OF SOUTHERN UTAH. LOCALLY  
HEAVY RAINFALL OCCURRED WITH THESE THUNDERSTORMS. A REMNANT AREA  
OF RAINFALL WITH EMBEDDED THUNDERSTORMS WILL CONTINUE TO IMPACT  
WASHINGTON COUNTY TO WESTERN KANE COUNTY THROUGH LATE THIS  
EVENING.  
 
A REMNANT MCV IS CURRENTLY LOCATED ACROSS WESTERN UTAH. THIS  
COMBINED WITH A SHORTWAVE LIFTING NORTHEAST HAS AIDED IN THE  
DEVELOPMENT OF LIGHT SHOWERS AND OCCASIONAL THUNDERSTORMS ACROSS  
PORTIONS OF CENTRAL AND NORTHEASTERN UTAH. THIS AREA OF SHOWERS  
WILL CONTINUE TO MOVE NORTHEAST AND EVENTUALLY DIMINISH LATER  
TONIGHT.  
 
ANOTHER ROUND OF CONVECTION IS EXPECTED THURSDAY AFTERNOON AND  
EVENING. WITH LIMITED DEEP LAYER SHEAR AND MARGINAL INSTABILITY,  
THE BIGGEST THREAT WITH ANY THUNDERSTORMS WILL LIKELY AGAIN BE  
LOCALIZED FLASH FLOODING AS LOW LEVEL MOISTURE CONTINUES TO  
INCREASE...PARTICULARLY ACROSS SOUTHERN UTAH.  
 
UPDATED THE FORECAST TO BETTER MATCH POPS WITH CURRENT TRENDS AND  
EXPECTED NOCTURNAL EVOLUTION. WILL CONTINUE TO MONITOR TRENDS  
THIS EVENING AS AN ADDITIONAL UPDATE MAY BE NECESSARY IF THE  
CURRENT FORECAST PROGRESSES PRECIPITATION TOO FAST TO THE  
NORTHEAST.  
 

 
   
AVIATION
 
LIGHT AND VARIABLE WINDS WILL BECOME SOUTHERLY AT THE  
SLC TERMINAL BETWEEN 0330Z AND 0430Z.  
 

 
   
FIRE WEATHER
 
MOISTURE WHICH HAS BEEN ON THE INCREASE FROM THE  
SOUTH NOW COVERS UTAH THIS AFTERNOON. THIS MOISTURE WILL FUEL  
SCATTERED SHOWERS AND THUNDERSTORMS THROUGH FRIDAY EVENING. FOR  
TONIGHT A COMBINATION WETTING RAINS AND GUSTY/ERRATIC WINDS WILL  
EXIST OUT OF THE SHOWERS/STORMS. WETTING RAINS WILL CONCENTRATE  
ACROSS SOUTHERN, CENTRAL AND NORTHEAST UTAH THROUGH THIS EVENING  
WITH SOMEWHAT DRIER STORMS WORKING NORTH ACROSS NORTHERN UTAH.  
 
FOR FRIDAY THE AREAL COVERAGE OF SHOWERS/STORMS SHOULD BE SIMILAR  
TO TODAY, WITH MOST OF THE ACTIVITY REMAIN OVER/NEAR THE HIGHER  
TERRAIN. THE AIR MASS WILL REMAIN QUITE MOIST, SO WETTING RAINS  
WILL ACCOMPANY SOME OF THE SHOWERS/STORMS DURING THE AFTERNOON  
AND EARLY EVENING HOURS.  
 
CHANGES WILL SHOWS UP LATE FRIDAY NIGHT/SATURDAY AS THE UPPER  
LEVEL TROUGH MOVING EAST FROM THE PACIFIC NORTHWEST TRACKS  
ACROSS THE NORTHERN ROCKIES AND NORTHERN UTAH. SIGNIFICANTLY  
DRIER AIR WILL FOLLOWING THIS PASSING TROUGH ON SATURDAY AS WILL  
MODESTLY COOLER TEMPERATURES FOR SUNDAY.  
 

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

 
 

 
 
KRUSE/CONGER  
 
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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