797  
FXUS66 KSTO 181545  
AFDSTO  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE SACRAMENTO CA  
845 AM PDT MON JUN 18 2018  
 
   
SYNOPSIS
 
 
DRY WITH WARM DAYTIME TEMPERATURES THIS WEEK, BECOMING HOT FRIDAY  
THROUGH SUNDAY.  
 

 
   
DISCUSSION
 
 
LARGE UPPER LOW CENTERED OVER SW IDAHO WITH ASSOCIATED TROUGHING  
EXTENDING OVER NORCAL. VISIBLE SATELLITE IMAGERY SHOWING EXTENSIVE  
STRATUS ALONG THE COAST EXTENDING INTO WESTERN PORTIONS OF THE  
DELTA. WIDESPREAD STRATUS AND FOG ALSO EVIDENT OVER PLUMAS COUNTY  
WHICH WILL GRADUALLY BURN OFF. SUNNY SKIES EXPECTED ACROSS THE  
CWA TODAY WITH SOME AFTERNOON CU/TCU DEVELOPING OVER THE EASTERN  
MOUNTAINS. HIGHER RESOLUTIONS MODELS SUGGEST A SLIGHT CHANCE OF  
AN AFTERNOON SHOWER OR THUNDERSTORMS OVER THE MOUNTAINS OF EASTERN  
SHASTA AND PLUMAS COUNTIES. MODERATE DELTA BREEZE AT THIS TIME  
WILL TREND DOWN THROUGH LATE MORNING. HEIGHTS AND THICKNESSES  
INCREASE TODAY AS UPPER LOW TO THE EAST FILLS AND SHORT WAVE  
RIDGING OFF THE COAST APPROACHES. ABOVE NORMAL HIGH TEMPERATURES  
FORECAST TODAY WITH MID TO UPPER 90S EXPECTED IN THE CENTRAL  
VALLEY.  
OFFSHORE UPPER RIDGING PROGGED TO BUILD AND PROGRESS INLAND  
THROUGH MIDWEEK WITH DRY WEATHER AND CONTINUED ABOVE NORMAL  
TEMPERATURES. SHORT WAVE UPPER TROUGHING SKIRTS THROUGH NORTHERN  
PORTIONS OF THE CWA WEDNESDAY NIGHT INTO THURSDAY MORNING. GFS-20  
GENERATES SOME CONVECTIVE PRECIP OVER THE SHASTA MOUNTAINS DURING  
THIS TIME FRAME, WHILE NAM12 AND ECMWF-HIRES KEEP PRECIP THREATS  
NORTH OF THE FORECAST AREA. MID TO UPPER 90S CONTINUE TO BE  
FORECAST IN THE CENTRAL VALLEY THROUGH THURSDAY.  
 
PCH  
 

 
 
.EXTENDED DISCUSSION (FRIDAY THROUGH MONDAY)  
DRY AND VERY WARM WEATHER IS EXPECTED THROUGH THE END OF THE WEEK  
AS PACIFIC UPPER LEVEL RIDGING EXPANDS EASTWARD INTO THE REGION  
AND BUILDS. WIDESPREAD TRIPLE DIGITS ARE EXPECTED ACROSS THE  
VALLEY BY FRIDAY, WITH EVEN HOTTER TEMPERATURES EXPECTED ON  
SATURDAY. THIS WILL BRING THE POTENTIAL FOR MODERATE HEAT RISK FOR  
SENSITIVE GROUPS INCLUDING THE ELDERLY AND THE VERY YOUNG FOR  
FRIDAY, POTENTIALLY AREAS WITH AREAS OF HIGH RISK ON SATURDAY.  
BREEZY NORTH WINDS WILL BRING LOWER HUMIDITY LEVELS AND INCREASING  
FIRE DANGER. SUNDAY MAY BE SLIGHTLY LESS HOT, AS A TROUGH MOVING  
THROUGH THE PACIFIC NORTHWEST FLATTENS THE RIDGE AND SHIFTS THE  
AXIS EASTWARD. COOLER WEATHER RETURNS ON MONDAY, WITH VALLEY HIGHS  
DROPPING TO AROUND 90. EK
 
   
AVIATION
 
 
VFR CONDITIONS CONTINUE OVER THE NEXT 24 HOURS. DRY WEATHER IS  
EXPECTED EXCEPT FOR ISOLATED SHOWERS OR THUNDERSTORMS POSSIBLE  
OVER THE LASSEN PARK AREA THIS AFTERNOON. WINDS AT TAF SITES WILL  
GENERALLY LESS THAN 10KT. EK  
 

 
   
STO WATCHES/WARNINGS/ADVISORIES
 
 
NONE.  

 
 

 
 
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