969  
FXUS66 KSTO 291006  
AFDSTO  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE SACRAMENTO CA  
306 AM PDT MON MAY 29 2017  
   
SYNOPSIS
 
 
TEMPERATURES A LITTLE ABOVE NORMAL FOR TODAY FOLLOWED BY A  
COOLDOWN TUESDAY. ISOLATED AFTERNOON SHOWERS OR THUNDERSTORMS  
POSSIBLE OVER THE MOUNTAINS INTO MID-WEEK.  
 

 
   
DISCUSSION
 
(TODAY THROUGH THURSDAY)  
A WEAK SHORTWAVE IS ALONG THE COAST AND IS NOT PROJECTED TO MOVE  
INLAND UNTIL TUESDAY. THIS WILL HELP TO KEEP MODERATE TO STRONG  
DELTA BREEZE GOING THROUGHOUT THE DAY TODAY AND THROUGH TUESDAY.  
THE MODELS ARE INDICATING THE BEST INSTABILITY OVER THE NEXT  
SEVERAL DAYS OCCURRING THIS AFTERNOON OVER THE SIERRA NEVADA ALONG  
THE CREST.  
 
THE TROUGH AXIS MOVES INLAND TUESDAY AND WE MAY CONTINUE TO SEE  
SOME AFTERNOON THUNDERSTORMS ALONG THE CREST FROM AROUND ALPINE  
COUNTY SOUTHWARD. A BROADER TROUGH WITH MORE MOISTURE WILL MOVE  
THROUGH WEDNESDAY AND MAY EVEN BRING A MIX OF LIGHT SHOWERS AND  
SPRINKLES TO THE VALLEY. FOR NOW HAVE LEFT OUT ANY MENTION OF  
THUNDER WITH THE MODELS NOT INDICATING GREAT ENOUGH INSTABILITY  
BUT WE WILL HAVE TO RE-EVALUATE THAT AS WE GET CLOSER TO  
WEDNESDAY. THURSDAY WILL BE A DRY DAY FOR THE WESTERN SLOPES WITH  
ZONAL FLOW OVER THE REGION AND THE BETTER CHANCES FOR ANYTHING  
WOULD BE EAST OF THE CREST.  
 
LITTLE CHANGE IN TEMPERATURES IS EXPECTED TODAY OTHER THAN IN THE  
DELTA AND SACRAMENTO REGION WHICH WILL HAVE SOME COOLING DUE TO  
THE STRONGER DELTA BREEZE TODAY AND LOW CLOUDS LINGERING IN THE  
BAY AREA MOST OF THE DAY. COOLING ALL AREAS WILL OCCUR BOTH FOR  
TUESDAY AND WEDNESDAY WITH THE COOLEST DAY OF THE WEEK LIKELY TO  
OCCUR ON WEDNESDAY.  
 

 
.EXTENDED DISCUSSION (FRIDAY THROUGH MONDAY)  
 
DRY WEATHER FRIDAY AS ZONAL FLOW CONTINUES. A WEAK SHORTWAVE  
RETURNS ALONG THE COAST FOR SATURDAY AND SUNDAY AND MAY HELP TO  
BRING BACK SOME THUNDERSTORMS ALONG THE CREST. FOR NOW CONDITIONS  
ARE FORECAST TO BE DRY BUT THAT MAY CHANGE. TEMPERATURES WILL WARM  
A LITTLE ABOVE NORMAL FOR THIS TIME OF YEAR BUT REMAIN PLEASANT.  
 

 
   
AVIATION
 
 
VFR CONDITIONS EXPECTED THROUGH THE NEXT 24 HOURS FOR TAF SITES,  
WITH WINDS GENERALLY 10 KTS OR LESS. GUSTS TO AROUND 30 KNOTS IN  
VICINITY OF THE DELTA. ISOLATED TSRA POSSIBLE IN THE HIGHER  
MOUNTAINS, 18Z-06Z. EK  
 

 
   
STO WATCHES/WARNINGS/ADVISORIES
 
 
NONE.  

 
 

 
 
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