051  
FXUS66 KHNX 231835  
AFDHNX  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE SAN JOAQUIN VALLEY - HANFORD CA  
1135 AM PDT SUN SEP 23 2018  
   
SYNOPSIS
 
 
SLIGHTLY COOLER WEATHER TODAY, AND THEN WE WILL TRANSITION BACK  
INTO THE MID 90'S FOR THE NEXT FEW DAYS IN THE LOWER ELEVATIONS  
OF THE SAN JOAQUIN VALLEY AS HIGH PRESSURE BUILDS. THIS WEEKEND,  
TEMPERATURES WILL FALL BACK TO NORMAL. NO RAIN IS FORECAST FOR  
THIS FORECAST PERIOD.  
 

 
   
DISCUSSION
 
 
PER LATEST GOES-17 SATELLITE IMAGERY, SOME CIRRUS CLOUDS CAN BE  
SEEN TODAY AHEAD OF A WEAK UPPER-LEVEL DISTURBANCE. THE TROUGH  
TODAY IS ALLOWING FOR A SLIGHT COOL DOWN FOR MOST OF CENTRAL  
CALIFORNIA. HI-RES MODEL GUIDANCE IS SUGGESTING A SLIGHT INCREASE  
IN THE GRADIENTS ASSOCIATED WITH THE TROUGH TONIGHT, WHICH SHOULD  
YIELD SOME DECENTLY STRONG WIND GUSTS IN PACHECHO PASS AS WELL AS  
THE MOUNTAIN PASSES IN KERN COUNTY, BUT WINDS WILL NOT BE AT  
WIND-ADVISORY CRITERIA LEVEL. AFTER TODAY, TEMPERATURES WILL  
START TO HEAT BACK UP AS HIGH PRESSURE ALOFT BUILDS OVER THE CWA  
-- MOST OF THE VALLEY WILL BE IN THE LOW TO MID 90'S TOMORROW.  
 
IN FACT, HIGH TEMPERATURES FOR MOST OF THE VALLEY WILL NOT VARY  
BY MUCH MORE THAN A DEGREE OR TWO FOR THE WORK WEEK. THIS WILL BE  
DUE TO THE REX BLOCK PATTERN THAT IS FORECAST BY MOST GLOBAL  
MODELS TO OCCUR OFF OF THE WEST COAST. THIS RIDGE/TROUGH DIPOLE  
SYSTEM IS NOT PROGGED TO MOVE MUCH THROUGH FRIDAY, THUS NO MAJOR  
CHANGES IN UPPER-AIR ARE FORECAST TO OCCUR OVER OUR CWA, GIVING US  
RATHER STAGNANT WEATHER FOR THE NEXT SEVERAL DAYS. AFTER FRIDAY,  
THE BLOCK WILL DRIFT SLOWLY TO THE EAST, AND 500 MB HEIGHTS ACROSS  
THE WEST COAST WILL FALL, GIVING US A CHANCE AT SOME DECENT  
SYNOPTIC COOLING. AT THIS TIME, NO SIGNIFICANT POP'S ARE BEING  
SEEN BY THE ECMWF OR THE GFS, SO HAVE OPTED TO REMAIN DRY FOR THE  
ENTIRE CWA FOR THIS FORECAST PERIOD (THROUGH NEXT SUNDAY).  
 

 
   
AVIATION
 
 
VFR CONDITIONS CAN BE EXPECTED THROUGHOUT THE CENTRAL CA INTERIOR  
FOR AT LEAST THE NEXT 24 HOURS.  
 

 
   
AIR QUALITY ISSUES
 
 
NONE.  
 

 
   
CERTAINTY
 
 
THE LEVEL OF CERTAINTY FOR DAYS 1 AND 2 IS HIGH.  
THE LEVEL OF CERTAINTY FOR DAYS 3 THROUGH 7 IS HIGH.  
 
CERTAINTY LEVELS INCLUDE LOW...MEDIUM...AND HIGH. PLEASE VISIT  
WWW.WEATHER.GOV/HNX/CERTAINTY.PHP FOR ADDITIONAL INFORMATION  
AN/OR TO PROVIDE FEEDBACK.  
 

 
   
HNX WATCHES/WARNINGS/ADVISORIES
 
 
NONE.  

 
 

 
 
PUBLIC...BOLLENBACHER  
AVN/FW...BOLLENBACHER  
SYNOPSIS...BOLLENBACHER  
 
WEATHER.GOV/HANFORD  
 
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